安卓項目回顧(二)

第二天：

任務一：給某個屏幕設置淡入淡出效果

//進行淡入淡出的效果

initAnimation();

private void initAnimation() {

// TODO 自動生成的方法存根

AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);//透明度

alphaAnimation.setDuration(3000);//設置時長

rl_root.startAnimation(alphaAnimation);

}

private void initUI() {

// TODO 自動生成的方法存根

    tv_version_name = (TextView) findViewById(R.id.tv_version_name);

    rl_root = (RelativeLayout) findViewById(R.id.rl_root);

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:background="@drawable/launcher_bg"

    android:id="@+id/rl_root"

    tools:context=".SplashActivity" >

ok，對項目的主題進行配置

<!-- Application theme. -->

    <style name="AppTheme" parent="AppBaseTheme">

        <!-- All customizations that are NOT specific to a particular API-level can go here. -->

    </style>

    <!-- <TextView 

        android:text="功能列表"

        android:gravity="center"

        android:textSize="20sp"

        android:textColor="#000"

        android:padding="10dp"

        android:background="#0f0"

        android:layout_width="match_parent"

    android:layout_height="wrap_content"/> --> 

    <style name="TitleStyle">

        <item name="android:gravity">center</item>

        <item name="android:textSize">20sp</item>

        <item name="android:textColor">#000</item>

        <item name="android:padding">10dp</item>

        <item name="android:background">#0f0</item>

        <item name="android:layout_width">match_parent</item>

        <item name="android:layout_height">wrap_content</item>

    </style>

<TextView

        style="@style/TitleStyle"

        android:text="功能列表" />

自定義類進行內容的聚焦，用于滾動

import android.content.Context;

import android.util.AttributeSet;

import android.widget.TextView;

public class FocusTextView extends TextView {

//使用在通過java代碼創建控件

public FocusTextView(Context context) {

super(context);

}

//由系統調用(帶屬性+上下文環境構造方法xml to java對象)

public FocusTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

//由系統調用(帶屬性+上下文環境構造方法+布局文件中定義樣式文件構造方法xml)

public FocusTextView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

//這是第二種方法重寫獲取焦點的方法,由系統調用,調用的時候默認就能獲取焦點，比textview好

@Override

public boolean isFocused() {

return true;

}

}

 <com.example.moblesafe73.view.FocusTextView

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ellipsize="marquee"

        android:marqueeRepeatLimit="marquee_forever"

        android:padding="5dp"

        android:singleLine="true"

        android:text="秋天秋天悄悄過去,留下小秘密,啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊"

        android:textColor="#000" >

    </com.example.moblesafe73.view.FocusTextView>

開始著手設置九宮格

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" 

    android:gravity="center"

    >

    <ImageView 

        android:id="@+id/iv_icon"

        android:background="@drawable/ic_launcher"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"/>

    <TextView 

        android:id="@+id/tv_title"

        android:text="模塊標題"

        android:textSize="18sp"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"/>

</LinearLayout>

<GridView

        android:id="@+id/gv_home"

        android:numColumns="3"

        android:verticalSpacing="10dp"

        android:layout_width="match_parent"

        android:layout_height="match_parent" >

    </GridView>

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

public class HomeActivity extends Activity{

private String[] mTitleStrs;

private int[] mDrawableIds;

private GridView gv_home;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_home);

initUI();

//初始化數據的方法

initData();

}

private void initData() {

//準備數據(文字(9組),圖片(9張))

mTitleStrs = new String[]{

"手機防盜","通信衛士","軟件管理","進程管理","流量統計","手機殺毒","緩存清理","高級工具","設置中心"

};

mDrawableIds = new int[]{

R.drawable.home_safe,R.drawable.home_callmsgsafe,

R.drawable.home_apps,R.drawable.home_taskmanager,

R.drawable.home_netmanager,R.drawable.home_trojan,

R.drawable.home_sysoptimize,R.drawable.home_tools,R.drawable.home_settings

};

//九宮格控件設置數據適配器(等同ListView數據適配器)

gv_home.setAdapter(new MyAdapter());

}

class MyAdapter extends BaseAdapter{

@Override

public int getCount() {

//條目的總數 文字組數 == 圖片張數

return mTitleStrs.length;

}

@Override

public Object getItem(int position) {

return mTitleStrs[position];

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

View view = View.inflate(getApplicationContext(), R.layout.gridview_item, null);

TextView tv_title = (TextView) view.findViewById(R.id.tv_title);

ImageView iv_icon = (ImageView) view.findViewById(R.id.iv_icon);

tv_title.setText(mTitleStrs[position]);

iv_icon.setBackgroundResource(mDrawableIds[position]);

return view;

}

}

private void initUI() {

gv_home = (GridView) findViewById(R.id.gv_home);

}

}