Android開發實現多進程彈窗效果

Posted on 2021-10-03 by WalkonNet

安卓開發之多進程彈窗，供大傢參考，具體內容如下

背景

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。

代碼實現

子進程彈窗

首先我們需要一個透明的activity來作為彈窗展示，並且這個透明activity就存在於子進程中，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>

而後設置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);
 
        ...
    }
    ...
}

使用到的佈局文件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於兩個進程中，因此觸摸事件的傳遞需要用IPC方式，這裡采用的是廣播。Utils.isDebugWindowValidTouched()負責判斷當前點擊事件是否點到瞭某個可點擊的控件，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瞭主進程彈窗的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);
    }
}

效果

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，當按下事件按到位於上層的組件時，上層的組件會響應；如果按到瞭上層彈窗的空白處，觸摸事件則會向下傳遞。

以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。

Android開發實現多進程彈窗效果

背景

代碼實現

效果

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