package com.example.performance;import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {if (Build.VERSION.SDK_INT >= 23) {if (Settings.canDrawOverlays(MainActivity.this)) {
//                Intent intent = new Intent(MainActivity.this, FloatingService.class);Toast.makeText(MainActivity.this,"已开启Toucher",Toast.LENGTH_SHORT).show();
//                startService(intent);
//                finish();} else {//若没有权限，提示获取.Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);Toast.makeText(MainActivity.this,"需要取得权限以使用悬浮窗",Toast.LENGTH_SHORT).show();startActivity(intent);}} else {//SDK在23以下，不用管.
//            Intent intent = new Intent(MainActivity.this, FloatingService.class);
//            startService(intent);
//            finish();
            }setContentView(R.layout.activity_main);Button startFloatWindow=(Button) findViewById(R.id.btn_floatWindows);startFloatWindow.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Intent intent=new Intent(MainActivity.this, FloatingService.class);startService(intent);finish();}});super.onCreate(savedInstanceState);}
}

package com.example.performance;import android.annotation.SuppressLint;
import android.app.Service;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.IBinder;
import android.provider.Settings;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;@SuppressLint({ "ShowToast", "ClickableViewAccessibility" })
public class FloatingService extends Service {@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {showFloatingWindow();return super.onStartCommand(intent, flags, startId);}private void showFloatingWindow() {if (Settings.canDrawOverlays(this)) {// 获取WindowManager服务final WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);// 新建悬浮窗控件final Button button = new Button(getApplicationContext());button.setText("Floating Window");button.setBackgroundColor(Color.BLUE);// 设置LayoutParamfinal WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;} else {layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;}layoutParams.format = PixelFormat.RGBA_8888;layoutParams.width = 500;layoutParams.height = 100;layoutParams.x = 100;layoutParams.y = 300;layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;// 将悬浮窗控件添加到WindowManager
            windowManager.addView(button, layoutParams);button.setOnTouchListener(new View.OnTouchListener(){private int x;private int y;@Overridepublic boolean onTouch(View view, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:x = (int) event.getRawX();y = (int) event.getRawY();break;case MotionEvent.ACTION_MOVE:int nowX = (int) event.getRawX();int nowY = (int) event.getRawY();int movedX = nowX - x;int movedY = nowY - y;x = nowX;y = nowY;layoutParams.x = layoutParams.x + movedX;layoutParams.y = layoutParams.y + movedY;// 更新悬浮窗控件布局
                    windowManager.updateViewLayout(view, layoutParams);break;default:break;}return false;}});}}}

View Code

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.performance"android:versionCode="1"android:versionName="1.0" >
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW"/><uses-sdkandroid:minSdkVersion="26"android:targetSdkVersion="26" /><applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name=".MainActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><service android:name=".FloatingService"/></application></manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"package="com.example.performance"android:versionCode="1"android:versionName="1.0" >
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW"/><uses-sdkandroid:minSdkVersion="26"android:targetSdkVersion="26" /><applicationandroid:allowBackup="true"android:icon="@drawable/ic_launcher"android:label="@string/app_name"android:theme="@style/AppTheme" ><activityandroid:name=".MainActivity"android:label="@string/app_name" ><intent-filter><action android:name="android.intent.action.MAIN" /><category android:name="android.intent.category.LAUNCHER" /></intent-filter></activity><service android:name=".FloatingService"/></application></manifest>