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这篇文章将为大家详细讲解有关Android开发怎么实现多进程弹窗效果,小编觉得挺实用的,因此分享给大家做个参考,希望大家阅读完这篇文章后可以有所收获。
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。
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:
<activity android:name=".ProcessActivity" android:process=":process_test" android:theme="@style/TranslucentStyle" />
使用到的主题定义在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> <!-- 是否有透明属性 --> <item name="android:backgroundDimEnabled">false</item> <!-- 背景是否半透明 --> <item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item> <!-- activity窗口切换效果 --> </style>
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:
<?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<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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