Android开发怎么实现多进程弹窗效果

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背景

有时在弹窗绘图时，需要弹窗在新的进程中，以保证在弹窗绘图的过程中不会占用过多的内存导致主进程被关。

代码实现

子进程弹窗

首先我们需要一个透明的activity来作为弹窗展示，并且这个透明activity就存在于子进程中，这一切都可以在清单文件中实现：

使用到的主题定义在res/values/themes.xml中：

而后设置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：

背景色为青色，两个button，一个负责展示toast，一个负责结束这个弹窗，我们在onCreate()中为它们添加点击事件监听：

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();});

接下来要实现的是事件透传：因为子进程窗口是一个弹窗，当没有触摸到弹窗中可点击组件时，应该由下面的activity去承接触摸事件，这部分逻辑的实现如下所示：

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);    }}

因为弹窗窗口和主窗口位于两个进程中，因此触摸事件的传递需要用IPC方式，这里采用的是广播。Utils.isDebugWindowValidTouched()负责判断当前点击事件是否点到了某个可点击的控件，方法代码如下：

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(); // 获取event在屏幕上的坐标    final float eventRawY = event.getRawY();     RectF rect = new RectF();    int[] location = new int[2];    view.getLocationOnScreen(location); // 获取view在屏幕上的坐标位置     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);}

子进程弹窗窗口ProcessActivity的完整代码如下所示：

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这个广播：

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);    }}

因为主界面中也有一个弹窗，因此当触摸事件从子进程传过来的时候，需要主进程的弹窗去处理，因此在onReceive()方法中通过反射执行了主进程弹窗的mDecorView的dispatchTouchEvent()方法去传递触摸事件，MainActivity的完整代码如下所示：

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 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

背景紫色的是主进程的弹窗，青色的是子进程的弹窗。从录像中可以看到，当按下事件按到位于上层的组件时，上层的组件会响应；如果按到了上层弹窗的空白处，触摸事件则会向下传递。

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