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這篇文章將為大家詳細講解有關Android開發怎么實現多進程彈窗效果,小編覺得挺實用的,因此分享給大家做個參考,希望大家閱讀完這篇文章后可以有所收獲。
有時在彈窗繪圖時,需要彈窗在新的進程中,以保證在彈窗繪圖的過程中不會占用過多的內存導致主進程被關。
子進程彈窗
首先我們需要一個透明的activity來作為彈窗展示,并且這個透明activity就存在于子進程中,這一切都可以在清單文件中實現:
<activity android:name=".ProcessActivity" android:process=":process_test" android:theme="@style/TranslucentStyle" />
使用到的主題定義在res/values/themes.xml中:
<style name="TranslucentStyle" parent="Theme.AppCompat.Light.NoActionBar"> <item name="android:windowBackground">@android:color/transparent</item> <!-- 背景色透明 --> <item name="android:windowIsTranslucent">true</item> <!-- 是否有透明屬性 --> <item name="android:backgroundDimEnabled">false</item> <!-- 背景是否半透明 --> <item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item> <!-- activity窗口切換效果 --> </style>
而后設置activity的位置和尺寸:
public class ProcessActivity extends Activity { ... @SuppressLint("ClickableViewAccessibility") @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_process); ... WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.width = 950; lp.height = 1700; lp.gravity = Gravity.START; getWindow().setAttributes(lp); ... } ... }
使用到的布局文件activity_process.xml如下所示:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/root_process" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/teal_200" android:orientation="vertical"> <Button android:id="@+id/btn_process" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Test sub process" /> <Button android:id="@+id/btn_finish" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginTop="5dp" android:text="finish sub process" /> </LinearLayout>
背景色為青色,兩個button,一個負責展示toast,一個負責結束這個彈窗,我們在onCreate()中為它們添加點擊事件監聽:
Button button_process = findViewById(R.id.btn_process); Button button_finish = findViewById(R.id.btn_finish); button_process.setOnClickListener(v -> { Toast.makeText(this, "onCreate: Button in sub process has been clicked.", Toast.LENGTH_SHORT).show(); }); button_finish.setOnClickListener(v -> { ProcessActivity.this.finish(); });
接下來要實現的是事件透傳:因為子進程窗口是一個彈窗,當沒有觸摸到彈窗中可點擊組件時,應該由下面的activity去承接觸摸事件,這部分邏輯的實現如下所示:
public class ProcessActivity extends Activity { private View mRootView; @SuppressLint("ClickableViewAccessibility") @Override protected void onCreate(@Nullable Bundle savedInstanceState) { mRootView = LayoutInflater.from(this).inflate(R.layout.activity_process, null); setContentView(mRootView); ... Button button_process = findViewById(R.id.btn_process); Button button_finish = findViewById(R.id.btn_finish); ... } @Override public boolean dispatchTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { View target = Utils.getViewTouchedByEvent(mRootView, event); if (target != null) { target.dispatchTouchEvent(event); return true; } } Intent intent = new Intent(); intent.setAction("TouchEvent"); intent.putExtra("event", event); sendBroadcast(intent); return super.dispatchTouchEvent(event); } }
因為彈窗窗口和主窗口位于兩個進程中,因此觸摸事件的傳遞需要用IPC方式,這里采用的是廣播。Utils.isDebugWindowValidTouched()負責判斷當前點擊事件是否點到了某個可點擊的控件,方法代碼如下:
public static View getViewTouchedByEvent(View view, MotionEvent event) { if (view == null || event == null) { return null; } if (!(view instanceof ViewGroup)) { return isDebugWindowValidTouched(view, event) ? view : null; } ViewGroup parent = ((ViewGroup) view); int childrenCount = parent.getChildCount(); for (int i = 0; i < childrenCount; i++) { View target = getViewTouchedByEvent(parent.getChildAt(i), event); if (target != null) { return target; } } return null; } private static boolean isDebugWindowValidTouched(View view, MotionEvent event) { if (event == null || view == null) { return false; } if (view.getVisibility() != View.VISIBLE) { return false; } final float eventRawX = event.getRawX(); // 獲取event在屏幕上的坐標 final float eventRawY = event.getRawY(); RectF rect = new RectF(); int[] location = new int[2]; view.getLocationOnScreen(location); // 獲取view在屏幕上的坐標位置 float x = location[0]; float y = location[1]; rect.left = x; rect.right = x + view.getWidth(); rect.top = y; rect.bottom = y + view.getHeight(); return rect.contains(eventRawX, eventRawY); }
子進程彈窗窗口ProcessActivity的完整代碼如下所示:
package com.example.testrxjava; import android.annotation.SuppressLint; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.Process; import android.util.Log; import android.view.Gravity; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.Button; import android.widget.CompoundButton; import android.widget.Switch; import android.widget.TextView; import android.widget.Toast; import android.widget.ToggleButton; import androidx.annotation.Nullable; import java.util.ArrayList; import java.util.List; public class ProcessActivity extends Activity { public static final String TAG = "ProcessActivity"; private View mRootView; @SuppressLint("ClickableViewAccessibility") @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); mRootView = LayoutInflater.from(this).inflate(R.layout.activity_process, null); setContentView(mRootView); Log.i(TAG, "onCreate: pid = " + Process.myPid()); Button button_process = findViewById(R.id.btn_process); TextView button_finish = findViewById(R.id.btn_finish); button_process.setOnClickListener(v -> { Toast.makeText(this, "onCreate: Button in sub process has been clicked.", Toast.LENGTH_SHORT).show(); }); button_finish.setOnClickListener(v -> { ProcessActivity.this.finish(); }); ToggleButton toggleButton = findViewById(R.id.toggle); toggleButton.setOnCheckedChangeListener((buttonView, isChecked) -> Toast.makeText(ProcessActivity.this, "Toggle button in sub process has been clicked, current state of checking is: " + isChecked, Toast.LENGTH_SHORT).show()); Switch switch_button = findViewById(R.id.switch_sub_process); switch_button.setOnCheckedChangeListener((buttonView, isChecked) -> Toast.makeText(ProcessActivity.this, "Switch in sub process has been clicked, current state of checking is: " + isChecked, Toast.LENGTH_SHORT).show()); WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.width = 950; lp.height = 1700; lp.gravity = Gravity.START; getWindow().setAttributes(lp); } @Override public boolean dispatchTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { View target = Utils.getViewTouchedByEvent(mRootView, event); if (target != null) { target.dispatchTouchEvent(event); return true; } } Intent intent = new Intent(); intent.setAction("TouchEvent"); intent.putExtra("event", event); sendBroadcast(intent); return super.dispatchTouchEvent(event); } }
主界面
回到主界面,首先需要接收一下TouchEvent這個廣播:
public class MainActivity extends AppCompatActivity { ... private BroadcastReceiver mReceiver; @Override protected void onCreate(Bundle savedInstanceState) { ... mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals("TouchEvent")) { MotionEvent event = intent.getParcelableExtra("event"); try { Class popupClass = Class.forName("android.widget.PopupWindow"); Field decorViewField = popupClass.getDeclaredField("mDecorView"); decorViewField.setAccessible(true); Object decorView = decorViewField.get(window); Method dispatchTouchEvent = decorView.getClass().getDeclaredMethod("dispatchTouchEvent", MotionEvent.class); dispatchTouchEvent.invoke(decorView, event); } catch (Exception e) { e.printStackTrace(); } } } }; IntentFilter filter = new IntentFilter("TouchEvent"); registerReceiver(mReceiver, filter); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(mReceiver); } }
因為主界面中也有一個彈窗,因此當觸摸事件從子進程傳過來的時候,需要主進程的彈窗去處理,因此在onReceive()方法中通過反射執行了主進程彈窗的mDecorView的dispatchTouchEvent()方法去傳遞觸摸事件,MainActivity的完整代碼如下所示:
package com.example.testrxjava; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.graphics.RectF; import android.os.Bundle; import android.os.Parcelable; import android.util.Log; import android.view.Gravity; import android.view.LayoutInflater; import android.view.MotionEvent; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ListView; import android.widget.PopupWindow; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private Button mButton; private Button mHide; private BroadcastReceiver mReceiver; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); TextView textView = findViewById(R.id.text_view); ListView listView = findViewById(R.id.list); ArrayList<String> list = new ArrayList<>(); for (int i = 0; i < 200; i++) { list.add("No." + i); } MyAdapter adapter = new MyAdapter(list, this); listView.setAdapter(adapter); adapter.notifyDataSetChanged(); PopupWindow window = new PopupWindow(this); View windowView = LayoutInflater.from(this).inflate(R.layout.window_layout, null); mButton = windowView.findViewById(R.id.btn_window); mButton.setOnClickListener(view -> { startActivity(new Intent(MainActivity.this, ProcessActivity.class)); }); mHide = windowView.findViewById(R.id.btn_hide); mHide.setOnClickListener(v -> { mButton.setVisibility(mButton.getVisibility() == View.VISIBLE ? View.GONE : View.VISIBLE); }); window.setTouchInterceptor((view, motionEvent) -> { if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) { View target = Utils.getViewTouchedByEvent(windowView, motionEvent); if (target != null) { target.dispatchTouchEvent(motionEvent); return true; } } MainActivity.this.dispatchTouchEvent(motionEvent); return false; }); View rootView = getWindow().getDecorView(); window.setOutsideTouchable(false); window.setOnDismissListener(() -> textView.post(() -> { window.showAtLocation(rootView, Gravity.BOTTOM, 0, 0); })); window.setContentView(windowView); window.setWidth(ViewGroup.LayoutParams.MATCH_PARENT); window.setHeight(ViewGroup.LayoutParams.WRAP_CONTENT); findViewById(R.id.root).setOnClickListener(v -> { Log.i("MainActivity", "Touch event gets to text view!"); }); textView.post(() -> { window.showAtLocation(rootView, Gravity.BOTTOM, 0, 0); }); mReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { if (intent.getAction().equals("TouchEvent")) { MotionEvent event = intent.getParcelableExtra("event"); try { Class popupClass = Class.forName("android.widget.PopupWindow"); Field decorViewField = popupClass.getDeclaredField("mDecorView"); decorViewField.setAccessible(true); Object decorView = decorViewField.get(window); Method dispatchTouchEvent = decorView.getClass().getDeclaredMethod("dispatchTouchEvent", MotionEvent.class); dispatchTouchEvent.invoke(decorView, event); } catch (Exception e) { e.printStackTrace(); } } } }; IntentFilter filter = new IntentFilter("TouchEvent"); registerReceiver(mReceiver, filter); } @Override protected void onDestroy() { super.onDestroy(); unregisterReceiver(mReceiver); } }
背景紫色的是主進程的彈窗,青色的是子進程的彈窗。從錄像中可以看到,當按下事件按到位于上層的組件時,上層的組件會響應;如果按到了上層彈窗的空白處,觸摸事件則會向下傳遞。
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