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這篇文章給大家介紹Android中怎么實現一個橫屏切換科學計算器，內容非常詳細，感興趣的小伙伴們可以參考借鑒，希望對大家能有所幫助。
1、豎屏時能實現基本的加減乘除運算、回退和清空輸入。
2、橫屏時變為科學計算器，實現函數計算、進制換算等功能。輸入計算公式，按等號鍵輸出計算結果。
3、公式輸入和結果顯示區支持長按彈出復制、粘貼功能。
4、使用計算器過程中應不彈出軟鍵盤。
5、可以通過進度條實時調整計算結果保留的小數點后位數，或者通過音量鍵完成同樣的效果。
6、實現附加功能：三角函數、階乘、XY、八進制轉換、十六進制轉換、√(Y&X)及括號，如sin(90)。
豎屏界面設計xml代碼：
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white" tools:context=".MainActivity"> <LinearLayout android:id="@+id/layout1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/textView" android:layout_width="match_parent" android:height="5dp" android:gravity="center|end" android:textColor="@color/black" android:textSize="50sp" android:text="" android:enabled="true" android:textCursorDrawable="@null" android:background="@null" android:inputType="none" android:textIsSelectable="true" android:layout_height="5dp" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="6dp" android:layout_marginBottom="5dp" android:progressDrawable="@drawable/bar" android:min="1" android:max="10"/> <androidx.gridlayout.widget.GridLayout android:layout_width="match_parent" android:layout_height="match_parent" app:useDefaultMargins="false" app:columnCount="4" app:rowCount="5"> <Button android:id="@+id/button5" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="C" /> <Button android:id="@+id/button6" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="÷" /> <Button android:id="@+id/button7" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="×" /> <Button android:id="@+id/button8" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="?" /> <Button android:id="@+id/button9" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="1" /> <Button android:id="@+id/button10" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="2" /> <Button android:id="@+id/button11" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="3" /> <Button android:id="@+id/button12" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="-" /> <Button android:id="@+id/button13" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="4" /> <Button android:id="@+id/button14" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="5" /> <Button android:id="@+id/button15" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="6" /> <Button android:id="@+id/button16" android:background="@drawable/func_btn_style" android:textSize="24sp" android:textColor="#0000ff" android:text="+" /> <Button android:id="@+id/button17" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="7" /> <Button android:id="@+id/button18" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="8" /> <Button android:id="@+id/button19" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="9" /> <Button android:id="@+id/button20" android:background="@drawable/equals_button_style" android:textSize="24sp" android:textColor="@color/white" app:layout_rowSpan="2" android:text="=" /> <Button android:id="@+id/button21" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="%" /> <Button android:id="@+id/button22" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="0" /> <Button android:id="@+id/button23" android:background="@drawable/buttonstyle" android:textSize="24sp" android:textColor="@color/black" android:text="." /> </androidx.gridlayout.widget.GridLayout> </LinearLayout> </androidx.constraintlayout.widget.ConstraintLayout>
豎屏效果圖：（調節進度條或通過音量鍵可以調節小數點位數唷！）
橫屏xml代碼：
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/white"
tools:context=".MainActivity">
<!-- 結果顯示框 -->
<LinearLayout
android:id="@+id/layout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<EditText
android:id="@+id/input"
android:layout_width="match_parent"
android:layout_height="75dp"
android:cursorVisible="false"
android:gravity="right|center_vertical"
android:enabled="true"
android:textCursorDrawable="@null"
android:background="@null"
android:inputType="none"
android:textSize="30sp"
android:textIsSelectable="true"/>
<!-- 接下去采TableRow的格式進行布局設計 -->
<androidx.gridlayout.widget.GridLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:rowCount="7"
app:columnCount="6">
<TextView
android:id="@+id/M"
android:layout_height="wrap_content"
android:gravity="center"
android:text=" Mem : " />
<TextView
android:id="@+id/mem"
android:layout_height="wrap_content"
app:layout_columnSpan="5"
android:gravity="left"
android:text=" 0" />
<SeekBar
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:progressDrawable="@drawable/bar"
android:layout_marginBottom="5dp"
android:layout_height="6dp"
app:layout_columnSpan="6"
android:min="1"
android:max="10"/>
<TextView
android:id="@+id/_drg"
android:layout_height="wrap_content"
android:textSize="18sp"
android:gravity="center"
android:background="@drawable/func_btn_style"
android:text="DEG" />
<Button
android:id="@+id/drg"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:textSize="18sp"
android:textColor="#888"
android:text="DRG" />
<Button
android:id="@+id/mc"
android:layout_height="wrap_content"
app:layout_columnSpan="2"
android:background="@drawable/func_btn_style"
android:textColor="#888"
android:textSize="18sp"
android:text="MC" />
<Button
android:id="@+id/c"
android:layout_height="wrap_content"
app:layout_columnSpan="2"
android:background="@drawable/func_btn_style"
android:textColor="#00b5e2"
android:textSize="18sp"
android:text="C" />
<Button
android:id="@+id/sin"
android:layout_height="wrap_content"
android:text="sin"
android:background="@drawable/func_btn_style"
android:textSize="18sp"
android:textColor="#888"
android:textAllCaps="false"/>
<Button
android:id="@+id/cos"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:background="@drawable/func_btn_style"
android:textSize="18sp"
android:textColor="#888"
android:text="cos" />
<Button
android:id="@+id/tan"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:textSize="18sp"
android:textColor="#888"
android:background="@drawable/func_btn_style"
android:text="tan" />
<Button
android:id="@+id/factorial"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:textSize="18sp"
android:textColor="#888"
android:background="@drawable/func_btn_style"
android:text="n!" />
<Button
android:id="@+id/bksp"
android:layout_height="wrap_content"
android:layout_weight="1"
app:layout_columnSpan="2"
android:background="@drawable/func_btn_style"
android:textColor="#00b5e2"
android:textSize="18sp"
android:text="?" />
<Button
android:id="@+id/one"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:textSize="18sp"
android:text="1" />
<Button
android:id="@+id/two"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:textSize="18sp"
android:text="2" />
<Button
android:id="@+id/three"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:textSize="18sp"
android:text="3" />
<Button
android:id="@+id/divide"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:textColor="#00b5e2"
android:textSize="18sp"
android:text="÷" />
<Button
android:id="@+id/left"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:text="("
android:textColor="#888"
android:textSize="18sp"/>
<Button
android:id="@+id/right"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:text=")"
android:textColor="#888"
android:textSize="18sp"/>
<Button
android:id="@+id/four"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="4"
android:textSize="18sp"/>
<Button
android:id="@+id/five"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="5"
android:textSize="18sp"/>
<Button
android:id="@+id/six"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="6"
android:textSize="18sp"/>
<Button
android:id="@+id/mul"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:textColor="#00b5e2"
android:text="×"
android:textSize="18sp"/>
<Button
android:id="@+id/sqrt"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:text="√"
android:textColor="#888"
android:textSize="18sp"/>
<Button
android:id="@+id/square"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:text="^"
android:textColor="#888"
android:textSize="18sp"/>
<Button
android:id="@+id/seven"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="7"
android:textSize="18sp"/>
<Button
android:id="@+id/eight"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="8"
android:textSize="18sp"/>
<Button
android:id="@+id/nine"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="9"
android:textSize="18sp"/>
<Button
android:id="@+id/sub"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:textColor="#00b5e2"
android:text="-"
android:textSize="18sp"/>
<Button
android:id="@+id/log"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:background="@drawable/func_btn_style"
android:text="log"
android:textColor="#888"
android:textSize="18sp"/>
<Button
android:id="@+id/ln"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:background="@drawable/func_btn_style"
android:text="ln"
android:textColor="#888"
android:textSize="18sp"/>
<Button
android:id="@+id/dot"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="."
android:textSize="18sp"/>
<Button
android:id="@+id/zero"
android:layout_height="wrap_content"
android:background="@drawable/buttonstyle"
android:text="0"
android:textSize="18sp"/>
<LinearLayout
android:id="@+id/linear"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<Button
android:id="@+id/bd"
android:layout_height="match_parent"
android:background="@drawable/buttonstyle"
android:text="D"
android:textSize="18sp"
android:layout_weight="1"
android:layout_width="match_parent" />
<Button
android:id="@+id/db"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/buttonstyle"
android:textSize="18sp"
android:layout_weight="1"
android:text="B" />
</LinearLayout>
<Button
android:id="@+id/add"
android:layout_height="wrap_content"
android:background="@drawable/func_btn_style"
android:textColor="#00b5e2"
android:text="+"
android:textSize="18sp"/>
<Button
android:id="@+id/equal"
android:layout_height="wrap_content"
android:background="@drawable/equals_button_style"
android:textColor="#ffffff"
app:layout_columnSpan="2"
android:text="="
android:textSize="18sp"/>
<TextView
android:id="@+id/T"
android:layout_height="wrap_content"
android:text="提示 : "
app:layout_columnSpan="6"/>
<TextView
android:id="@+id/tip"
android:layout_height="wrap_content"
android:text="歡迎使用！"
app:layout_columnSpan="6"/>
</androidx.gridlayout.widget.GridLayout>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>橫屏效果圖：
Java代碼如下：
package com.zjw;
import android.app.Activity;
import android.content.ClipboardManager;
import android.content.res.Configuration;
import android.graphics.Point;
import android.os.Bundle;
import android.text.Editable;
import android.text.method.KeyListener;
import android.util.Log;
import android.view.Display;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import java.math.BigDecimal;
import java.util.StringTokenizer;
public class MainActivity extends Activity {
/**
* 定義變量
*/
//舍入精度
public static final int[] DEF_DIV_SCALE = {17};
//初始化顯示數據
private final String[] init =new String[1];
//顯示框
private EditText input;// 用于顯示輸出結果
//劃動條
private SeekBar seekBar;
//普通控件及變量
private Button[] btn = new Button[10];// 0~9十個數字
private TextView mem, _drg, tip;
private Button div, mul, sub, add, equal, sin, cos, tan, log, ln, sqrt,
square, factorial, bksp, left, right, dot, bd, db, drg, mc, c;
public String str_old;
public String str_new;
public boolean vbegin = true;// 控制輸入，true為重新輸入，false為接著輸入
public boolean drg_flag = true;// true為角度，false為弧度
public double pi = 4 * Math.atan(1);// π值
public boolean tip_lock = true;// true為正確，可以繼續輸入，false錯誤，輸入鎖定
public boolean equals_flag = true;// 是否在按下=之后輸入，true為之前，false為之后
//定義ContextMenu中每個菜單選項的Id
final int Menu_1 = Menu.FIRST;
final int Menu_2 = Menu.FIRST + 1;
private ClipboardManager mClipboard = null;
public boolean onCreateOptionsMenu(Menu menu) {
//導入菜單布局
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item) {
//創建菜單項的點擊事件
switch (item.getItemId()) {
case R.id.menu_setting:
Toast.makeText(this, "點擊了設置", Toast.LENGTH_SHORT).show();
break;
case R.id.menu_out:
// Toast.makeText(this, "點擊了退出", Toast.LENGTH_SHORT).show();
android.os.Process.killProcess(android.os.Process.myPid());//獲取PID
System.exit(0);
break;
default:
break;
}
return super.onOptionsItemSelected(item);
}
/**
*onCreate
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//切換布局后調用，初始化顯示
if(savedInstanceState!=null){
init[0] = savedInstanceState.getString("exp");
equals_flag = false;
}
//屏幕方向監聽
int orientation = getResources().getConfiguration().orientation;
if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
// 橫屏內容
setContentView(R.layout.activity_main2);
InitWigdet();
AllWigdetListener();
}
else if (orientation == Configuration.ORIENTATION_PORTRAIT) {
// 豎屏內容
setContentView(R.layout.activity_main);
input = (EditText)findViewById(R.id.textView);
input.setText(init[0]);
seekBar = (SeekBar) findViewById(R.id.seekBar);
seekBar.setProgress(DEF_DIV_SCALE[0]);
seekBar.setOnSeekBarChangeListener(onSeekBarChangeListener);
Display defaultDisplay = getWindowManager().getDefaultDisplay();
Point point = new Point();
defaultDisplay.getSize(point);
Integer x = point.x;
Integer y = point.y;
input.setKeyListener(new KeyListener() {
@Override
public int getInputType() {
return 0;
}
@Override
public boolean onKeyDown(View view, Editable editable, int i, KeyEvent keyEvent) {
return false;
}
@Override
public boolean onKeyUp(View view, Editable editable, int i, KeyEvent keyEvent) {
return false;
}
@Override
public boolean onKeyOther(View view, Editable editable, KeyEvent keyEvent) {
return false;
}
@Override
public void clearMetaKeyState(View view, Editable editable, int i) {
}
});
View.OnClickListener onClearListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
input.setText("");
}
};
View.OnClickListener onClearLastListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
String s = input.getText().toString();
int len = s.length();
if(len>0) {
s = s.substring(0, len - 1);
input.setText(s);
}
}
};
View.OnClickListener onEXPListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
Button temp = (Button)view;
String s = temp.getText().toString();
String show = input.getText().toString();
int len = show.length();
if(show.length()==0){
if(s.equals("+")||s.equals("×")||s.equals("÷")) return;
}
if((show.endsWith("+"))||(show.endsWith("-"))||(show.endsWith("×"))||(show.endsWith("÷"))||(show.endsWith("."))){
if(s.equals("+")||s.equals("×")||s.equals("÷")||s.equals("-")||(s.equals("."))){
show = show.substring(0,len-1) + s;
input.setText(show);
}else{
input.append(s);
}
}else{
input.append(s);
}
}
};
View.OnClickListener onEXECListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
String s = input.getText().toString();
if(s.length()==0) return;
s = s.replace("×","*");
s = s.replace("÷","/");
s = s.replace("%","");
if((s.endsWith("+"))||(s.endsWith("-"))||(s.endsWith("*"))||(s.endsWith("/"))||(s.endsWith(".")))return;
try{
String re = Calculator.conversion(s);
re = round(re,DEF_DIV_SCALE[0]);
if(re.indexOf(".") > 0){
re = re.replaceAll("0+?$", "");//去掉多余的0
re = re.replaceAll("[.]$", "");//如最后一位是.則去掉
}
input.setText(re);
}catch (Exception e){
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
input.setText("");
}
}
};
View.OnClickListener onPERCENTCListener = new View.OnClickListener() {
@Override
public void onClick(View view) {
String s = input.getText().toString();
if(s.length()==0) return;
s = s.replace("×","*");
s = s.replace("÷","/");
s = s.replace("%","");
if((s.endsWith("+"))||(s.endsWith("-"))||(s.endsWith("*"))||(s.endsWith("/"))||(s.endsWith("."))) return;
s = s+"/100";
try{
String re = Calculator.conversion(s);
re = round(re,DEF_DIV_SCALE[0]);
if(re.indexOf(".") > 0){
re = re.replaceAll("0+?$", "");//去掉多余的0
re = re.replaceAll("[.]$", "");//如最后一位是.則去掉
}
input.setText(re+"%");
}catch (Exception e){
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
input.setText("");
}
}
};
input.getLayoutParams().height = 2*y/7;
Button button5 = (Button)findViewById(R.id.button5); button5.getLayoutParams().width = x/4 ;button5.getLayoutParams().height = y/8;
Button button6 = (Button)findViewById(R.id.button6); button6.getLayoutParams().width = x/4 ;button6.getLayoutParams().height = y/8;
Button button7 = (Button)findViewById(R.id.button7); button7.getLayoutParams().width = x/4 ;button7.getLayoutParams().height = y/8;
Button button8 = (Button)findViewById(R.id.button8); button8.getLayoutParams().width = x/4 ;button8.getLayoutParams().height = y/8;
Button button9 = (Button)findViewById(R.id.button9); button9.getLayoutParams().width = x/4 ;button9.getLayoutParams().height = y/8;
Button button10 = (Button)findViewById(R.id.button10); button10.getLayoutParams().width = x/4 ;button10.getLayoutParams().height = y/8;
Button button11 = (Button)findViewById(R.id.button11); button11.getLayoutParams().width = x/4 ;button11.getLayoutParams().height = y/8;
Button button12 = (Button)findViewById(R.id.button12); button12.getLayoutParams().width = x/4 ;button12.getLayoutParams().height = y/8;
Button button13 = (Button)findViewById(R.id.button13); button13.getLayoutParams().width = x/4 ;button13.getLayoutParams().height = y/8;
Button button14 = (Button)findViewById(R.id.button14); button14.getLayoutParams().width = x/4 ;button14.getLayoutParams().height = y/8;
Button button15 = (Button)findViewById(R.id.button15); button15.getLayoutParams().width = x/4 ;button15.getLayoutParams().height = y/8;
Button button16 = (Button)findViewById(R.id.button16); button16.getLayoutParams().width = x/4 ;button16.getLayoutParams().height = y/8;
Button button17 = (Button)findViewById(R.id.button17); button17.getLayoutParams().width = x/4 ;button17.getLayoutParams().height = y/8;
Button button18 = (Button)findViewById(R.id.button18); button18.getLayoutParams().width = x/4 ;button18.getLayoutParams().height = y/8;
Button button19 = (Button)findViewById(R.id.button19); button19.getLayoutParams().width = x/4 ;button19.getLayoutParams().height = y/8;
Button button20 = (Button)findViewById(R.id.button20); button20.getLayoutParams().width = x/4 ;button20.getLayoutParams().height = 2*(y/8);
Button button21 = (Button)findViewById(R.id.button21); button21.getLayoutParams().width = x/4 ;button21.getLayoutParams().height = y/8;
Button button22 = (Button)findViewById(R.id.button22); button22.getLayoutParams().width = x/4 ;button22.getLayoutParams().height = y/8;
Button button23 = (Button)findViewById(R.id.button23); button23.getLayoutParams().width = x/4 ;button23.getLayoutParams().height = y/8;
button6.setOnClickListener(onEXPListener);button7.setOnClickListener(onEXPListener);
button9.setOnClickListener(onEXPListener);button10.setOnClickListener(onEXPListener);
button11.setOnClickListener(onEXPListener);button12.setOnClickListener(onEXPListener);
button13.setOnClickListener(onEXPListener);button14.setOnClickListener(onEXPListener);
button15.setOnClickListener(onEXPListener);button16.setOnClickListener(onEXPListener);
button17.setOnClickListener(onEXPListener);button18.setOnClickListener(onEXPListener);
button19.setOnClickListener(onEXPListener);button21.setOnClickListener(onEXPListener);
button22.setOnClickListener(onEXPListener);button23.setOnClickListener(onEXPListener);
button5.setOnClickListener(onClearListener);
button8.setOnClickListener(onClearLastListener);
button20.setOnClickListener(onEXECListener);
button21.setOnClickListener(onPERCENTCListener);
}
}
/**
* 初始化所有的組件
*/
private void InitWigdet() {
//獲取屏幕參數
Display defaultDisplay = getWindowManager().getDefaultDisplay();
Point point = new Point();
defaultDisplay.getSize(point);
Integer x = point.x;
Integer y = point.y - 60;
// 獲取界面元素
input = (EditText) findViewById(R.id.input);
input.setKeyListener(new KeyListener() {
@Override
public int getInputType() {
return 0;
}
@Override
public boolean onKeyDown(View view, Editable editable, int i, KeyEvent keyEvent) {
return false;
}
@Override
public boolean onKeyUp(View view, Editable editable, int i, KeyEvent keyEvent) {
return false;
}
@Override
public boolean onKeyOther(View view, Editable editable, KeyEvent keyEvent) {
return false;
}
@Override
public void clearMetaKeyState(View view, Editable editable, int i) {
}
});
input.setText(init[0]);
seekBar = (SeekBar) findViewById(R.id.seekBar); //seekBar.getLayoutParams().height = y/7/3;
seekBar.setProgress(DEF_DIV_SCALE[0]);
seekBar.setOnSeekBarChangeListener(onSeekBarChangeListener);
input.getLayoutParams().height = y/9;
mem = (TextView) findViewById(R.id.mem);
tip = (TextView) findViewById(R.id.tip);
_drg = (TextView) findViewById(R.id._drg); _drg.getLayoutParams().width = x/6 ;_drg.getLayoutParams().height = y/10-8;
btn[0] = (Button) findViewById(R.id.zero); btn[0].getLayoutParams().width = x/6 ;btn[0].getLayoutParams().height = y/10;
btn[1] = (Button) findViewById(R.id.one); btn[1].getLayoutParams().width = x/6 ;btn[1].getLayoutParams().height = y/10;
btn[2] = (Button) findViewById(R.id.two); btn[2].getLayoutParams().width = x/6 ;btn[2].getLayoutParams().height = y/10;
btn[3] = (Button) findViewById(R.id.three); btn[3].getLayoutParams().width = x/6 ;btn[3].getLayoutParams().height = y/10;
btn[4] = (Button) findViewById(R.id.four); btn[4].getLayoutParams().width = x/6 ;btn[4].getLayoutParams().height = y/10;
btn[5] = (Button) findViewById(R.id.five); btn[5].getLayoutParams().width = x/6 ;btn[5].getLayoutParams().height = y/10;
btn[6] = (Button) findViewById(R.id.six); btn[6].getLayoutParams().width = x/6 ;btn[6].getLayoutParams().height = y/10;
btn[7] = (Button) findViewById(R.id.seven); btn[7].getLayoutParams().width = x/6 ;btn[7].getLayoutParams().height = y/10;
btn[8] = (Button) findViewById(R.id.eight); btn[8].getLayoutParams().width = x/6 ;btn[8].getLayoutParams().height = y/10;
btn[9] = (Button) findViewById(R.id.nine); btn[9].getLayoutParams().width = x/6 ;btn[9].getLayoutParams().height = y/10;
div = (Button) findViewById(R.id.divide); div.getLayoutParams().width = x/6 ;div.getLayoutParams().height = y/10;
mul = (Button) findViewById(R.id.mul);mul.getLayoutParams().width = x/6 ;mul.getLayoutParams().height = y/10;
sub = (Button) findViewById(R.id.sub); sub.getLayoutParams().width = x/6 ;sub.getLayoutParams().height = y/10;
add = (Button) findViewById(R.id.add); add.getLayoutParams().width = x/6 ;add.getLayoutParams().height = y/10;
equal = (Button) findViewById(R.id.equal); equal.getLayoutParams().width = 2*x/6 ;equal.getLayoutParams().height = y/10;
sin = (Button) findViewById(R.id.sin); sin.getLayoutParams().width = x/6 ;sin.getLayoutParams().height = y/10-8;
cos = (Button) findViewById(R.id.cos); cos.getLayoutParams().width = x/6 ;cos.getLayoutParams().height = y/10-8;
tan = (Button) findViewById(R.id.tan); tan.getLayoutParams().width = x/6 ;tan.getLayoutParams().height = y/10-8;
log = (Button) findViewById(R.id.log); log.getLayoutParams().width = x/6 ;log.getLayoutParams().height = y/10;
ln = (Button) findViewById(R.id.ln); ln.getLayoutParams().width = x/6 ;ln.getLayoutParams().height = y/10;
sqrt = (Button) findViewById(R.id.sqrt); sqrt.getLayoutParams().width = x/6 ;sqrt.getLayoutParams().height = y/10;
square = (Button) findViewById(R.id.square); square.getLayoutParams().width = x/6 ;square.getLayoutParams().height = y/10;
factorial = (Button) findViewById(R.id.factorial);factorial.getLayoutParams().width = x/6 ;factorial.getLayoutParams().height = y/10-8;
bksp = (Button) findViewById(R.id.bksp);bksp.getLayoutParams().width = 2*x/6 ;bksp.getLayoutParams().height = y/10-8;
left = (Button) findViewById(R.id.left); left.getLayoutParams().width = x/6 ;left.getLayoutParams().height = y/10;
right = (Button) findViewById(R.id.right); right.getLayoutParams().width = x/6 ;right.getLayoutParams().height = y/10;
dot = (Button) findViewById(R.id.dot);dot.getLayoutParams().width = x/6 ;dot.getLayoutParams().height = y/10;
bd = (Button) findViewById(R.id.bd);
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.linear);linearLayout.getLayoutParams().width = x/6 ;linearLayout.getLayoutParams().height = y/10;
db = (Button) findViewById(R.id.db);
drg = (Button) findViewById(R.id.drg);drg.getLayoutParams().width = x/6 ;drg.getLayoutParams().height = y/10-8;
mc = (Button) findViewById(R.id.mc); mc.getLayoutParams().width = 2*x/6 ;mc.getLayoutParams().height = y/10-8;
c = (Button) findViewById(R.id.c); c.getLayoutParams().width = 2*x/6 ;c.getLayoutParams().height = y/10-8;
}
/**
* 為所有按鍵綁定監聽器
*/
private void AllWigdetListener() {
// 數字鍵
for (int i = 0; i < 10; i++) {
btn[i].setOnClickListener(actionPerformed);
}
// 為+-x÷等按鍵綁定監聽器
div.setOnClickListener(actionPerformed);
mul.setOnClickListener(actionPerformed);
sub.setOnClickListener(actionPerformed);
add.setOnClickListener(actionPerformed);
equal.setOnClickListener(actionPerformed);
sin.setOnClickListener(actionPerformed);
cos.setOnClickListener(actionPerformed);
tan.setOnClickListener(actionPerformed);
log.setOnClickListener(actionPerformed);
ln.setOnClickListener(actionPerformed);
sqrt.setOnClickListener(actionPerformed);
square.setOnClickListener(actionPerformed);
factorial.setOnClickListener(actionPerformed);
bksp.setOnClickListener(actionPerformed);
left.setOnClickListener(actionPerformed);
right.setOnClickListener(actionPerformed);
dot.setOnClickListener(actionPerformed);
bd.setOnClickListener(actionPerformed);
db.setOnClickListener(actionPerformed);
drg.setOnClickListener(actionPerformed);
mc.setOnClickListener(actionPerformed);
c.setOnClickListener(actionPerformed);
}
/**
* 鍵盤命令捕捉
*/
String[] TipCommand = new String[500];
int tip_i = 0;// TipCommand的指針
private View.OnClickListener actionPerformed = new View.OnClickListener() {
public void onClick(View v) {
// 按鍵上的命令獲取
String command = ((Button) v).getText().toString();
// 顯示器上的字符串
String str = input.getText().toString();
// 檢測輸入是否合法
if (equals_flag == false
&& "0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1) {
// 檢測顯示器上的字符串是否合法
if (right(str)) {
if ("+-×÷√^)".indexOf(command) != -1) {
for (int i = 0; i < str.length(); i++) {
TipCommand[tip_i] = String.valueOf(str.charAt(i));
tip_i++;
}
vbegin = false;
}
} else {
input.setText("0");
vbegin = true;
tip_i = 0;
tip_lock = true;
tip.setText("welcome use the APP！");
}
equals_flag = true;
}
if (tip_i > 0)
TipChecker(TipCommand[tip_i - 1], command);
else if (tip_i == 0) {
TipChecker("#", command);
}
if ("0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1
&& tip_lock) {
TipCommand[tip_i] = command;
tip_i++;
}
// 若輸入正確，則將輸入信息顯示到顯示器上
if ("0123456789.()sincostanlnlogn!+-×÷√^".indexOf(command) != -1
&& tip_lock) { // 共25個按鍵
print(command);
// 若果點擊了“DRG”，則切換當前弧度角度制，并將切換后的結果顯示到按鍵上方。
} else if (command.compareTo("DRG") == 0 && tip_lock) {
if (drg_flag == true) {
drg_flag = false;
_drg.setText("RAD");
} else {
drg_flag = true;
_drg.setText("DEG");
}
// 如果輸入時退格鍵，并且是在按=之前
} else if (command.compareTo("?") == 0 && equals_flag) {
// 一次刪除3個字符
if (TTO(str) == 3) {
if (str.length() > 3)
input.setText(str.substring(0, str.length() - 3));
else if (str.length() == 3) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("welcome use the APP！");
}
// 依次刪除2個字符
} else if (TTO(str) == 2) {
if (str.length() > 2)
input.setText(str.substring(0, str.length() - 2));
else if (str.length() == 2) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("welcome use the APP！");
}
// 依次刪除一個字符
} else if (TTO(str) == 1) {
// 若之前輸入的字符串合法則刪除一個字符
if (right(str)) {
if (str.length() > 1)
input.setText(str.substring(0, str.length() - 1));
else if (str.length() == 1) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("welcome use the APP！");
}
// 若之前輸入的字符串不合法則刪除全部字符
} else {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("welcome use the APP！");
}
}
if (input.getText().toString().compareTo("-") == 0
|| equals_flag == false) {
input.setText("0");
vbegin = true;
tip_i = 0;
tip.setText("welcome use the APP！");
}
tip_lock = true;
if (tip_i > 0)
tip_i--;
// 如果是在按=之后輸入退格鍵
} else if (command.compareTo("Bksp") == 0 && equals_flag == false) {
// 將顯示器內容設置為0
input.setText("0");
vbegin = true;
tip_i = 0;
tip_lock = true;
tip.setText("welcome use the APP！");
// 如果輸入的是清除鍵
} else if (command.compareTo("C") == 0) {
// 將顯示器內容設置為0
input.setText("0");
// 重新輸入標志置為true
vbegin = true;
// 緩存命令位數清0
tip_i = 0;
// 表明可以繼續輸入
tip_lock = true;
// 表明輸入=之前
equals_flag = true;
tip.setText("welcome use the APP！");
// 如果輸入的是”MC“，則將存儲器內容清0
} else if (command.compareTo("MC") == 0) {
mem.setText("0");
// 如果按”bd“則轉換進制
} else if (command.compareTo("B") == 0) {
String s = input.getText().toString();
s = s.replace(".","");
//非法字符清屏
if(".+-x÷√^sincostanloglnn!()".indexOf(s) != -1){
input.setText("0");
}else
{
try {
int a = Integer.valueOf(s);
String re = Integer.toBinaryString(a);
input.setText(re);
}catch (Exception e){
input.setText("");
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
}
}
// 如果按”db“則轉換進制
}else if(command.compareTo("D") == 0){
String s = input.getText().toString();
s = s.replace(".","");
input.setText("1234567890");
//非法字符清屏
if("23456789+-x÷√^sincostanloglnn!().".indexOf(s) != -1){
input.setText("0");
}else{
try{
Integer re = Integer.parseInt(s,2);
input.setText(re.toString());
}catch (Exception e){
input.setText("");
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
}
}
} else if (command.compareTo("=") == 0 && tip_lock && right(str)
&& equals_flag) {
tip_i = 0;
// 表明不可以繼續輸入
tip_lock = false;
// 表明輸入=之后
equals_flag = false;
// 保存原來算式樣子
str_old = str;
// 替換算式中的運算符，便于計算
str = str.replaceAll("sin", "s");
str = str.replaceAll("cos", "c");
str = str.replaceAll("tan", "t");
str = str.replaceAll("log", "g");
str = str.replaceAll("ln", "l");
str = str.replaceAll("n!", "!");
// 重新輸入標志設置true
vbegin = true;
// 將-1x轉換成-
str_new = str.replaceAll("-", "-1×");
// 計算算式結果
new calc().process(str_new);
}
// 表明可以繼續輸入
tip_lock = true;
}
};
/*
* 檢測函數，對str進行前后語法檢測 為Tip的提示方式提供依據，與TipShow()配合使用 編號 字符 其后可以跟隨的合法字符 1 （
* 數字|（|-|.|函數 2 ） 算符|）|√ ^ 3 . 數字|算符|）|√ ^ 4 數字 .|數字|算符|）|√ ^ 5 算符
* 數字|（|.|函數 6 √ ^ （ |. | 數字 7 函數 數字|（|.
*
* 小數點前后均可省略，表示0 數字第一位可以為0
*/
private void TipChecker(String tipcommand1, String tipcommand2) {
// Tipcode1表示錯誤類型，Tipcode2表示名詞解釋類型
int Tipcode1 = 0, Tipcode2 = 0;
// 表示命令類型
int tiptype1 = 0, tiptype2 = 0;
// 括號數
int bracket = 0;
// “+-x÷√^”不能作為第一位
if (tipcommand1.compareTo("#") == 0
&& (tipcommand2.compareTo("÷") == 0
|| tipcommand2.compareTo("×") == 0
|| tipcommand2.compareTo("+") == 0
|| tipcommand2.compareTo(")") == 0
|| tipcommand2.compareTo("√") == 0 || tipcommand2
.compareTo("^") == 0)) {
Tipcode1 = -1;
}
// 定義存儲字符串中最后一位的類型
else if (tipcommand1.compareTo("#") != 0) {
if (tipcommand1.compareTo("(") == 0) {
tiptype1 = 1;
} else if (tipcommand1.compareTo(")") == 0) {
tiptype1 = 2;
} else if (tipcommand1.compareTo(".") == 0) {
tiptype1 = 3;
} else if ("0123456789".indexOf(tipcommand1) != -1) {
tiptype1 = 4;
} else if ("+-×÷".indexOf(tipcommand1) != -1) {
tiptype1 = 5;
} else if ("√^".indexOf(tipcommand1) != -1) {
tiptype1 = 6;
} else if ("sincostanloglnn!".indexOf(tipcommand1) != -1) {
tiptype1 = 7;
}
// 定義欲輸入的按鍵類型
if (tipcommand2.compareTo("(") == 0) {
tiptype2 = 1;
} else if (tipcommand2.compareTo(")") == 0) {
tiptype2 = 2;
} else if (tipcommand2.compareTo(".") == 0) {
tiptype2 = 3;
} else if ("0123456789".indexOf(tipcommand2) != -1) {
tiptype2 = 4;
} else if ("+-×÷".indexOf(tipcommand2) != -1) {
tiptype2 = 5;
} else if ("√^".indexOf(tipcommand2) != -1) {
tiptype2 = 6;
} else if ("sincostanloglnn!".indexOf(tipcommand2) != -1) {
tiptype2 = 7;
}
switch (tiptype1) {
case 1:
// 左括號后面直接接右括號,“+x÷”（負號“-”不算）,或者"√^"
if (tiptype2 == 2
|| (tiptype2 == 5 && tipcommand2.compareTo("-") != 0)
|| tiptype2 == 6)
Tipcode1 = 1;
break;
case 2:
// 右括號后面接左括號，數字，“+-x÷sin^...”
if (tiptype2 == 1 || tiptype2 == 3 || tiptype2 == 4
|| tiptype2 == 7)
Tipcode1 = 2;
break;
case 3:
// “.”后面接左括號或者“sincos...”
if (tiptype2 == 1 || tiptype2 == 7)
Tipcode1 = 3;
// 連續輸入兩個“.”
if (tiptype2 == 3)
Tipcode1 = 8;
break;
case 4:
// 數字后面直接接左括號或者“sincos...”
if (tiptype2 == 1 || tiptype2 == 7)
Tipcode1 = 4;
break;
case 5:
// “+-x÷”后面直接接右括號，“+-x÷√^”
if (tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6)
Tipcode1 = 5;
break;
case 6:
// “√^”后面直接接右括號，“+-x÷√^”以及“sincos...”
if (tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6
|| tiptype2 == 7)
Tipcode1 = 6;
break;
case 7:
// “sincos...”后面直接接右括號“+-x÷√^”以及“sincos...”
if (tiptype2 == 2 || tiptype2 == 5 || tiptype2 == 6
|| tiptype2 == 7)
Tipcode1 = 7;
break;
}
}
// 檢測小數點的重復性，Tipconde1=0,表明滿足前面的規則
if (Tipcode1 == 0 && tipcommand2.compareTo(".") == 0) {
int tip_point = 0;
for (int i = 0; i < tip_i; i++) {
// 若之前出現一個小數點點，則小數點計數加1
if (TipCommand[i].compareTo(".") == 0) {
tip_point++;
}
// 若出現以下幾個運算符之一，小數點計數清零
if (TipCommand[i].compareTo("sin") == 0
|| TipCommand[i].compareTo("cos") == 0
|| TipCommand[i].compareTo("tan") == 0
|| TipCommand[i].compareTo("log") == 0
|| TipCommand[i].compareTo("ln") == 0
|| TipCommand[i].compareTo("n!") == 0
|| TipCommand[i].compareTo("√") == 0
|| TipCommand[i].compareTo("^") == 0
|| TipCommand[i].compareTo("÷") == 0
|| TipCommand[i].compareTo("×") == 0
|| TipCommand[i].compareTo("-") == 0
|| TipCommand[i].compareTo("+") == 0
|| TipCommand[i].compareTo("(") == 0
|| TipCommand[i].compareTo(")") == 0) {
tip_point = 0;
}
}
tip_point++;
// 若小數點計數大于1，表明小數點重復了
if (tip_point > 1) {
Tipcode1 = 8;
}
}
// 檢測右括號是否匹配
if (Tipcode1 == 0 && tipcommand2.compareTo(")") == 0) {
int tip_right_bracket = 0;
for (int i = 0; i < tip_i; i++) {
// 如果出現一個左括號，則計數加1
if (TipCommand[i].compareTo("(") == 0) {
tip_right_bracket++;
}
// 如果出現一個右括號，則計數減1
if (TipCommand[i].compareTo(")") == 0) {
tip_right_bracket--;
}
}
// 如果右括號計數=0,表明沒有響應的左括號與當前右括號匹配
if (tip_right_bracket == 0) {
Tipcode1 = 10;
}
}
// 檢查輸入=的合法性
if (Tipcode1 == 0 && tipcommand2.compareTo("=") == 0) {
// 括號匹配數
int tip_bracket = 0;
for (int i = 0; i < tip_i; i++) {
if (TipCommand[i].compareTo("(") == 0) {
tip_bracket++;
}
if (TipCommand[i].compareTo(")") == 0) {
tip_bracket--;
}
}
// 若大于0，表明左括號還有未匹配的
if (tip_bracket > 0) {
Tipcode1 = 9;
bracket = tip_bracket;
} else if (tip_bracket == 0) {
// 若前一個字符是以下之一，表明=號不合法
if ("√^sincostanloglnn!".indexOf(tipcommand1) != -1) {
Tipcode1 = 6;
}
// 若前一個字符是以下之一，表明=號不合法
if ("+-×÷".indexOf(tipcommand1) != -1) {
Tipcode1 = 5;
}
}
}
// 若命令式以下之一，則顯示相應的幫助信息
if (tipcommand2.compareTo("MC") == 0)
Tipcode2 = 1;
if (tipcommand2.compareTo("C") == 0)
Tipcode2 = 2;
if (tipcommand2.compareTo("DRG") == 0)
Tipcode2 = 3;
if (tipcommand2.compareTo("Bksp") == 0)
Tipcode2 = 4;
if (tipcommand2.compareTo("sin") == 0)
Tipcode2 = 5;
if (tipcommand2.compareTo("cos") == 0)
Tipcode2 = 6;
if (tipcommand2.compareTo("tan") == 0)
Tipcode2 = 7;
if (tipcommand2.compareTo("log") == 0)
Tipcode2 = 8;
if (tipcommand2.compareTo("ln") == 0)
Tipcode2 = 9;
if (tipcommand2.compareTo("n!") == 0)
Tipcode2 = 10;
if (tipcommand2.compareTo("√") == 0)
Tipcode2 = 11;
if (tipcommand2.compareTo("^") == 0)
Tipcode2 = 12;
// 顯示幫助和錯誤信息
TipShow(bracket, Tipcode1, Tipcode2, tipcommand1, tipcommand2);
}
/*
* 反饋Tip信息，加強人機交互，與TipChecker()配合使用
*/
private void TipShow(int bracket, int tipcode1, int tipcode2,String tipcommand1, String tipcommand2) {
String tipmessage = "";
if (tipcode1 != 0)
tip_lock = false;// 表明輸入有誤
switch (tipcode1) {
case -1:
tipmessage = tipcommand2 + " 不能作為第一個算符\n";
break;
case 1:
tipmessage = tipcommand1 + " 后應輸入：數字/(/./-/函數 \n";
break;
case 2:
tipmessage = tipcommand1 + " 后應輸入：)/算符 \n";
break;
case 3:
tipmessage = tipcommand1 + " 后應輸入：)/數字/算符 \n";
break;
case 4:
tipmessage = tipcommand1 + " 后應輸入：)/./數字 /算符 \n";
break;
case 5:
tipmessage = tipcommand1 + " 后應輸入：(/./數字/函數 \n";
break;
case 6:
tipmessage = tipcommand1 + " 后應輸入：(/./數字 \n";
break;
case 7:
tipmessage = tipcommand1 + " 后應輸入：(/./數字 \n";
break;
case 8:
tipmessage = "小數點重復\n";
break;
case 9:
tipmessage = "不能計算，缺少 " + bracket + " 個 )";
break;
case 10:
tipmessage = "不需要 )";
break;
}
switch (tipcode2) {
case 1:
tipmessage = tipmessage + "[MC 用法: 清除記憶 MEM]";
break;
case 2:
tipmessage = tipmessage + "[C 用法: 歸零]";
break;
case 3:
tipmessage = tipmessage + "[DRG 用法: 選擇 DEG 或 RAD]";
break;
case 4:
tipmessage = tipmessage + "[Bksp 用法: 退格]";
break;
case 5:
tipmessage = tipmessage + "sin 函數用法示例：\n"
+ "DEG：sin30 = 0.5 RAD：sin1 = 0.84\n"
+ "注：與其他函數一起使用時要加括號，如：\n" + "sin(cos45)，而不是sincos45";
break;
case 6:
tipmessage = tipmessage + "cos 函數用法示例：\n"
+ "DEG：cos60 = 0.5 RAD：cos1 = 0.54\n"
+ "注：與其他函數一起使用時要加括號，如：\n" + "cos(sin45)，而不是cossin45";
break;
case 7:
tipmessage = tipmessage + "tan 函數用法示例：\n"
+ "DEG：tan45 = 1 RAD：tan1 = 1.55\n"
+ "注：與其他函數一起使用時要加括號，如：\n" + "tan(cos45)，而不是tancos45";
break;
case 8:
tipmessage = tipmessage + "log 函數用法示例：\n"
+ "log10 = log(5+5) = 1\n" + "注：與其他函數一起使用時要加括號，如：\n"
+ "log(tan45)，而不是logtan45";
break;
case 9:
tipmessage = tipmessage + "ln 函數用法示例：\n"
+ "ln10 = le(5+5) = 2.3 lne = 1\n"
+ "注：與其他函數一起使用時要加括號，如：\n" + "ln(tan45)，而不是lntan45";
break;
case 10:
tipmessage = tipmessage + "n! 函數用法示例：\n"
+ "n!3 = n!(1+2) = 3×2×1 = 6\n" + "注：與其他函數一起使用時要加括號，如：\n"
+ "n!(log1000)，而不是n!log1000";
break;
case 11:
tipmessage = tipmessage + "√ 用法示例：開任意次根號\n"
+ "如：27開3次根為 27√3 = 3\n" + "注：與其他函數一起使用時要加括號，如：\n"
+ "(函數)√(函數) ， (n!3)√(log100) = 2.45";
break;
case 12:
tipmessage = tipmessage + "^ 用法示例：開任意次平方\n" + "如：2的3次方為 2^3 = 8\n"
+ "注：與其他函數一起使用時要加括號，如：\n"
+ "(函數)√(函數) ， (n!3)^(log100) = 36";
break;
}
// 將提示信息顯示到tip
tip.setText(tipmessage);
}
/**
* 將信息顯示在顯示屏上
*/
private void print(String str) {
// 清屏后輸出
if (vbegin) {
input.setText(str);
} else {
input.append(str);
}
vbegin = false;
}
/*
* 檢測函數，返回值為3、2、1 表示應當一次刪除幾個？ Three+Two+One = TTO 為Bksp按鈕的刪除方式提供依據
* 返回3，表示str尾部為sin、cos、tan、log中的一個，應當一次刪除3個 返回2，表示str尾部為ln、n!中的一個，應當一次刪除2個
* 返回1，表示為除返回3、2外的所有情況，只需刪除一個（包含非法字符時要另外考慮：應清屏）
*/
private int TTO(String str) {
if ((str.charAt(str.length() - 1) == 'n'
&& str.charAt(str.length() - 2) == 'i' && str.charAt(str
.length() - 3) == 's')
|| (str.charAt(str.length() - 1) == 's'
&& str.charAt(str.length() - 2) == 'o' && str
.charAt(str.length() - 3) == 'c')
|| (str.charAt(str.length() - 1) == 'n'
&& str.charAt(str.length() - 2) == 'a' && str
.charAt(str.length() - 3) == 't')
|| (str.charAt(str.length() - 1) == 'g'
&& str.charAt(str.length() - 2) == 'o' && str
.charAt(str.length() - 3) == 'l')) {
return 3;
} else if ((str.charAt(str.length() - 1) == 'n' && str.charAt(str
.length() - 2) == 'l')
|| (str.charAt(str.length() - 1) == '!' && str.charAt(str
.length() - 2) == 'n')) {
return 2;
} else {
return 1;
}
}
/*
* 判斷一個str是否是合法的，返回值為true、false
* 只包含0123456789.()sincostanlnlogn!+-×÷√^的是合法的str，返回true
* 包含了除0123456789.()sincostanlnlogn!+-×÷√^以外的字符的str為非法的，返回false
*/
private boolean right(String str) {
int i = 0;
for (i = 0; i < str.length(); i++) {
if (str.charAt(i) != '0' && str.charAt(i) != '1'
&& str.charAt(i) != '2' && str.charAt(i) != '3'
&& str.charAt(i) != '4' && str.charAt(i) != '5'
&& str.charAt(i) != '6' && str.charAt(i) != '7'
&& str.charAt(i) != '8' && str.charAt(i) != '9'
&& str.charAt(i) != '.' && str.charAt(i) != '-'
&& str.charAt(i) != '+' && str.charAt(i) != '×'
&& str.charAt(i) != '÷' && str.charAt(i) != '√'
&& str.charAt(i) != '^' && str.charAt(i) != 's'
&& str.charAt(i) != 'i' && str.charAt(i) != 'n'
&& str.charAt(i) != 'c' && str.charAt(i) != 'o'
&& str.charAt(i) != 't' && str.charAt(i) != 'a'
&& str.charAt(i) != 'l' && str.charAt(i) != 'g'
&& str.charAt(i) != '(' && str.charAt(i) != ')'
&& str.charAt(i) != '!')
break;
}
if (i == str.length()) {
return true;
} else {
return false;
}
}
/*
* 整個計算核心，
* 只要將表達式的整個字符串傳入calc().process()就可以實行計算了 算法包括以下幾部分：
* 1、計算部分
* process(String str) 當然，這是建立在查錯無錯誤的情況下
* 2、數據格式化 FP(double n) 使數據有相當的精確度
* 3、階乘算法 N(double n) 計算n!，將結果返回
* 4、錯誤提示 showError(int code ,String str)
* 將錯誤返回
*/
public class calc {
public calc() {
}
final int MAXLEN = 500;
/*
* 計算表達式 從左向右掃描，數字入number棧，運算符入operator棧
* +-基本優先級為1，
* ×÷基本優先級為2，
* log ln sin cos tan n!基本優先級為3，
* √^基本優先級為4
* 括號內層運算符比外層同級運算符優先級高4
* 當前運算符優先級高于棧頂壓棧，
* 低于棧頂彈出一個運算符與兩個數進行運算
* 重復直到當前運算符大于棧頂
* 掃描完后對剩下的運算符與數字依次計算
*/
public void process(String str) {
int weightPlus = 0, topOp = 0, topNum = 0, flag = 1, weightTemp = 0;
// weightPlus為同一（）下的基本優先級，weightTemp臨時記錄優先級的變化
// topOp為weight[]，operator[]的計數器；topNum為number[]的計數器
// flag為正負數的計數器，1為正數，-1為負數
int weight[]; // 保存operator棧中運算符的優先級，以topOp計數
double number[]; // 保存數字，以topNum計數
char ch, ch_gai, operator[];// operator[]保存運算符，以topOp計數
String num;// 記錄數字，str以+-×÷()sctgl!√^分段，+-×÷()sctgl!√^字符之間的字符串即為數字
weight = new int[MAXLEN];
number = new double[MAXLEN];
operator = new char[MAXLEN];
String expression = str;
StringTokenizer expToken = new StringTokenizer(expression,
"+-×÷()sctgl!√^");
int i = 0;
while (i < expression.length()) {
ch = expression.charAt(i);
// 判斷正負數
if (i == 0) {
if (ch == '-')
flag = -1;
} else if (expression.charAt(i - 1) == '(' && ch == '-')
flag = -1;
// 取得數字，并將正負符號轉移給數字
if (ch <= '9' && ch >= '0' || ch == '.' || ch == 'E') {
num = expToken.nextToken();
ch_gai = ch;
Log.e("guojs", ch + "--->" + i);
// 取得整個數字
while (i < expression.length()
&& (ch_gai <= '9' && ch_gai >= '0' || ch_gai == '.' || ch_gai == 'E')) {
ch_gai = expression.charAt(i++);
Log.e("guojs", "i的值為：" + i);
}
// 將指針退回之前的位置
if (i >= expression.length())
i -= 1;
else {
i -= 2;
}
if (num.compareTo(".") == 0)
number[topNum++] = 0;
// 將正負符號轉移給數字
else {
number[topNum++] = Double.parseDouble(num) * flag;
flag = 1;
}
}
// 計算運算符的優先級
if (ch == '(')
weightPlus += 4;
if (ch == ')')
weightPlus -= 4;
if (ch == '-' && flag == 1 || ch == '+' || ch == '×'
|| ch == '÷' || ch == 's' || ch == 'c' || ch == 't'
|| ch == 'g' || ch == 'l' || ch == '!' || ch == '√'
|| ch == '^') {
switch (ch) {
// +-的優先級最低，為1
case '+':
case '-':
weightTemp = 1 + weightPlus;
break;
// x÷的優先級稍高，為2
case '×':
case '÷':
weightTemp = 2 + weightPlus;
break;
// sincos之類優先級為3
case 's':
case 'c':
case 't':
case 'g':
case 'l':
case '!':
weightTemp = 3 + weightPlus;
break;
// 其余優先級為4
// case '^':
// case '√':
default:
weightTemp = 4 + weightPlus;
break;
}
// 如果當前優先級大于堆棧頂部元素，則直接入棧
if (topOp == 0 || weight[topOp - 1] < weightTemp) {
weight[topOp] = weightTemp;
operator[topOp] = ch;
topOp++;
// 否則將堆棧中運算符逐個取出，直到當前堆棧頂部運算符的優先級小于當前運算符
} else {
while (topOp > 0 && weight[topOp - 1] >= weightTemp) {
switch (operator[topOp - 1]) {
// 取出數字數組的相應元素進行運算
case '+':
number[topNum - 2] += number[topNum - 1];
break;
case '-':
number[topNum - 2] -= number[topNum - 1];
break;
case '×':
number[topNum - 2] *= number[topNum - 1];
break;
// 判斷除數為0的情況
case '÷':
if (number[topNum - 1] == 0) {
showError(1, str_old);
return;
}
number[topNum - 2] /= number[topNum - 1];
break;
case '√':
if (number[topNum - 1] == 0
|| (number[topNum - 2] < 0 && number[topNum - 1] % 2 == 0)) {
showError(2, str_old);
return;
}
number[topNum - 2] = Math.pow(
number[topNum - 2],
1 / number[topNum - 1]);
break;
case '^':
number[topNum - 2] = Math.pow(
number[topNum - 2], number[topNum - 1]);
break;
// 計算時進行角度弧度的判斷及轉換
// sin
case 's':
if (drg_flag == true) {
number[topNum - 1] = Math
.sin((number[topNum - 1] / 180)
* pi);
} else {
number[topNum - 1] = Math
.sin(number[topNum - 1]);
}
topNum++;
break;
// cos
case 'c':
if (drg_flag == true) {
number[topNum - 1] = Math
.cos((number[topNum - 1] / 180)
* pi);
} else {
number[topNum - 1] = Math
.cos(number[topNum - 1]);
}
topNum++;
break;
// tan
case 't':
if (drg_flag == true) {
if ((Math.abs(number[topNum - 1]) / 90) % 2 == 1) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math
.tan((number[topNum - 1] / 180)
* pi);
} else {
if ((Math.abs(number[topNum - 1]) / (pi / 2)) % 2 == 1) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math
.tan(number[topNum - 1]);
}
topNum++;
break;
// log
case 'g':
if (number[topNum - 1] <= 0) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math
.log10(number[topNum - 1]);
topNum++;
break;
// ln
case 'l':
if (number[topNum - 1] <= 0) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math
.log(number[topNum - 1]);
topNum++;
break;
// 階乘
case '!':
if (number[topNum - 1] > 170) {
showError(3, str_old);
return;
} else if (number[topNum - 1] < 0) {
showError(2, str_old);
return;
}
number[topNum - 1] = N(number[topNum - 1]);
topNum++;
break;
}
// 繼續取堆棧的下一個元素進行判斷
topNum--;
topOp--;
}
// 將運算符如堆棧
weight[topOp] = weightTemp;
operator[topOp] = ch;
topOp++;
}
}
i++;
}
// 依次取出堆棧的運算符進行運算
while (topOp > 0) {
// +-x直接將數組的后兩位數取出運算
switch (operator[topOp - 1]) {
case '+':
number[topNum - 2] += number[topNum - 1];
break;
case '-':
number[topNum - 2] -= number[topNum - 1];
break;
case '×':
number[topNum - 2] *= number[topNum - 1];
break;
// 涉及到除法時要考慮除數不能為零的情況
case '÷':
if (number[topNum - 1] == 0) {
showError(1, str_old);
return;
}
number[topNum - 2] /= number[topNum - 1];
break;
case '√':
if (number[topNum - 1] == 0
|| (number[topNum - 2] < 0 && number[topNum - 1] % 2 == 0)) {
showError(2, str_old);
return;
}
number[topNum - 2] = Math.pow(number[topNum - 2],
1 / number[topNum - 1]);
break;
case '^':
number[topNum - 2] = Math.pow(number[topNum - 2],
number[topNum - 1]);
break;
// sin
case 's':
if (drg_flag == true) {
number[topNum - 1] = Math
.sin((number[topNum - 1] / 180) * pi);
} else {
number[topNum - 1] = Math.sin(number[topNum - 1]);
}
topNum++;
break;
// cos
case 'c':
if (drg_flag == true) {
number[topNum - 1] = Math
.cos((number[topNum - 1] / 180) * pi);
} else {
number[topNum - 1] = Math.cos(number[topNum - 1]);
}
topNum++;
break;
// tan
case 't':
if (drg_flag == true) {
if ((Math.abs(number[topNum - 1]) / 90) % 2 == 1) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math
.tan((number[topNum - 1] / 180) * pi);
} else {
if ((Math.abs(number[topNum - 1]) / (pi / 2)) % 2 == 1) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math.tan(number[topNum - 1]);
}
topNum++;
break;
// 對數log
case 'g':
if (number[topNum - 1] <= 0) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math.log10(number[topNum - 1]);
topNum++;
break;
// 自然對數ln
case 'l':
if (number[topNum - 1] <= 0) {
showError(2, str_old);
return;
}
number[topNum - 1] = Math.log(number[topNum - 1]);
topNum++;
break;
// 階乘
case '!':
if (number[topNum - 1] > 170) {
showError(3, str_old);
return;
} else if (number[topNum - 1] < 0) {
showError(2, str_old);
return;
}
number[topNum - 1] = N(number[topNum - 1]);
topNum++;
break;
}
// 取堆棧下一個元素計算
topNum--;
topOp--;
}
// 如果是數字太大，提示錯誤信息
if (number[0] > 7.3E306) {
showError(3, str_old);
return;
}
// 輸出最終結果
input.setText(String.valueOf(FP(number[0])));
tip.setText("計算完畢，要繼續請按歸零鍵 C");
mem.setText(str_old + "=" + String.valueOf(FP(number[0])));
}
/*
* FP = floating point 控制小數位數，達到精度 否則會出現
* 0.6-0.2=0.39999999999999997的情況，用FP即可解決，使得數為0.4 本格式精度為15位
*/
public double FP(double n) {
// NumberFormat format=NumberFormat.getInstance(); //創建一個格式化類f
// format.setMaximumFractionDigits(18); //設置小數位的格式
// DecimalFormat format = new DecimalFormat("0.#############");
Double re = n;
String s = round(re.toString(),DEF_DIV_SCALE[0]);
return Double.parseDouble(s);
}
/*
* 階乘算法
*/
public double N(double n) {
int i = 0;
double sum = 1;
// 依次將小于等于n的值相乘
for (i = 1; i <= n; i++) {
sum = sum * i;
}
return sum;
}
/*
* 錯誤提示，按了"="之后，若計算式在process()過程中，出現錯誤，則進行提示
*/
public void showError(int code, String str) {
String message = "";
switch (code) {
case 1:
message = "零不能作除數";
break;
case 2:
message = "函數格式錯誤";
break;
case 3:
message = "值太大了，超出范圍";
}
input.setText("\"" + str + "\"" + ": " + message);
tip.setText(message + "\n" + "計算完畢，要繼續請按歸零鍵 C");
}
}
/**
*保存切換頁面時EditEext中的值
*/
@Override //這種方式保存數據只是臨時保存，無法永久保存
protected void onSaveInstanceState(@NonNull Bundle outState) { //該函數用于提取出歷史數據，保存到outState中
super.onSaveInstanceState(outState);
init[0] = input.getText().toString();
outState.putString("exp",init[0]);
}
/**
*舍入精度
*/
public static String round(String v, int scale) {
if (scale < 0) {
throw new IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b = new BigDecimal(v);
BigDecimal one = new BigDecimal("1");
BigDecimal re = b.divide(one, scale, BigDecimal.ROUND_HALF_UP);
return re.toString();
}
// @Override
// public boolean onCreateOptionsMenu(Menu menu) {
// // Inflate the menu; this adds items to the action bar if it is present.
// getMenuInflater().inflate(R.menu.main, menu);
// return true;
// }
/**
*音量鍵事件
*/
@Override
public boolean onKeyDown (int keyCode, KeyEvent event) {
String s = input.getText().toString();
if(s.length()<1){
}else {
switch (keyCode) {
// 音量減小
case KeyEvent.KEYCODE_VOLUME_DOWN:
if(DEF_DIV_SCALE[0]>1)
DEF_DIV_SCALE[0]--;
seekBar.setProgress(DEF_DIV_SCALE[0]);
Toast.makeText(this.getApplicationContext(), "DOWN " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show();
if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0]));
// 音量減小時應該執行的功能代碼
return true;
// 音量增大
case KeyEvent.KEYCODE_VOLUME_UP:
if(DEF_DIV_SCALE[0]<40)
DEF_DIV_SCALE[0]++;
seekBar.setProgress(DEF_DIV_SCALE[0]);
Toast.makeText(this.getApplicationContext(), "UP " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show();
if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0]));
// 音量增大時應該執行的功能代碼
return true;
}
}
return super.onKeyDown (keyCode, event);
}
/**
* 滑動條事件
*/
public SeekBar.OnSeekBarChangeListener onSeekBarChangeListener = new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
//txt_cur.setText("當前進度值:" + progress + " / 100 ");
String s = input.getText().toString();
if(s.length()<1){
return;
}else{
if(progress>DEF_DIV_SCALE[0]){
DEF_DIV_SCALE[0] = progress;
Toast.makeText(getApplicationContext(), "UP " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show();
if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0]));
}else if(progress<DEF_DIV_SCALE[0]){
DEF_DIV_SCALE[0] = progress;
Toast.makeText(getApplicationContext(), "DOWN " + DEF_DIV_SCALE[0], Toast.LENGTH_SHORT).show();
if(s.contains(".")) input.setText(round(s,DEF_DIV_SCALE[0]));
}
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
//Toast.makeText(mContext, "觸碰SeekBar", Toast.LENGTH_SHORT).show();
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
//Toast.makeText(mContext, "放開SeekBar", Toast.LENGTH_SHORT).show();
}
};
/**
* 二進制2十進制
*/
public int BinaryToDecimal(String s){
int binaryNumber = Integer.valueOf(s);
int decimal = 0;
int p = 0;
while(true){
if(binaryNumber == 0){
break;
} else {
int temp = binaryNumber%10;
decimal += temp*Math.pow(2, p);
binaryNumber = binaryNumber/10;
p++;
}
}
return decimal;
}
/**
*十進制2二進制
*/
}關于Android中怎么實現一個橫屏切換科學計算器就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。
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