Android 悬浮窗全系统版本实现

悬浮窗是在系统上显示的内容，好像微信视频聊天时的小窗口一样，在退出软件后依然存在的一个窗口，本博客以窗口中放一个button组件为例，简单展示悬浮窗，其中包括了对Android 6.0以下、Android 6.0到Android 8.0、Android 8.0以上版本的处理，下面开始介绍实现方法：

1、MainActivity中的代码

public Button mFloatingButton;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//初始化viewinitView();}//初始化viewprivate void initView() {mFloatingButton=(Button) findViewById(R.id.floating_btn);mFloatingButton.setOnClickListener(this);}public void startFloatingButtonService(View view) {Log.e("测试流程", "测试流程");if (FloatingService_Button.isStarted) {Log.e("测试流程2", "测试流程2");return;}if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断系统版本if (!Settings.canDrawOverlays(this)) {Toast.makeText(this, "当前无权限，请授权", Toast.LENGTH_SHORT);Log.e("测试流程3", "测试流程3");startActivityForResult(new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION, Uri.parse("package:" + getPackageName())), 0);} else {Log.e("测试流程4", "测试流程4");startService(new Intent(MainActivity.this, FloatingService_Button.class));}} else {startService(new Intent(MainActivity.this, FloatingService_Button.class));}}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {if (requestCode == 0) {if (!Settings.canDrawOverlays(this)) {Log.e("测试流程5", "测试流程5");Toast.makeText(this, "授权失败", Toast.LENGTH_SHORT).show();} else {Log.e("测试流程6", "测试流程6");Toast.makeText(this, "授权成功", Toast.LENGTH_SHORT).show();startService(new Intent(MainActivity.this, FloatingService_Button.class));}}}@Overridepublic void onClick(View v) {switch (v.getId()){case R.id.floating_btn :startFloatingButtonService(v);break;}}

思路简单解释：点击弹出悬浮窗按钮时，获取版本并判断“Build.VERSION.SDK_INT >= Build.VERSION_CODES.M”如果系统版本在6.0以下这不需要请求权限，如果系统版本在6.0以上需要进行权限检测以及请求，获取权限后，弹出悬浮框

2、activity_main.xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context="com.example.jack_lin.suspendwindow.MainActivity"><Buttonandroid:id="@+id/floating_btn"style="@style/floatingBtn"android:text="@string/floating_btn" /></LinearLayout>

简单解释：xml中没什么特别东西，线性布局中放一个按钮

3、FloatingService_Button的代码

public static boolean isStarted = false;private WindowManager windowManager;private WindowManager.LayoutParams layoutParams;private Button button;@Overridepublic void onCreate() {super.onCreate();Log.e("进入服务1", "进入服务1");isStarted = true;windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);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_PHONE;}layoutParams.format = PixelFormat.RGBA_8888;layoutParams.gravity = Gravity.LEFT | Gravity.TOP;layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;layoutParams.width = 500;layoutParams.height = 100;layoutParams.x = 300;layoutParams.y = 300;}@Nullable@Overridepublic IBinder onBind(Intent intent) {Log.e("进入服务2", "进入服务2");return null;}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.e("进入服务3", "进入服务3");showFloatingWindow();return super.onStartCommand(intent, flags, startId);}private void showFloatingWindow() {if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {//判断系统版本if (Settings.canDrawOverlays(this)) {button = new Button(getApplicationContext());button.setText("我是个button窗口");button.setBackgroundColor(Color.BLUE);windowManager.addView(button, layoutParams);button.setOnTouchListener(new FloatingOnTouchListener());}} else {button = new Button(getApplicationContext());button.setText("我是个button窗口");button.setBackgroundColor(Color.BLUE);windowManager.addView(button, layoutParams);button.setOnTouchListener(new FloatingOnTouchListener());}}private class FloatingOnTouchListener implements 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;windowManager.updateViewLayout(view, layoutParams);break;default:break;}return false;}}

思路简单解释：首先获取WindowManager服务，然后定义并设置在window上显示的layoutParams（此处需注意Android 8.0以上版本中LayoutParam里的type变量变为TYPE_APPLICATION_OVERLAY与Android 8.0以下版本LayoutParam里的type变量TYPE_PHONE不一样，需要通过判断系统版本进行区分），然后定义并设置在layoutParams上面显示的Button按钮以及监听事件（此处的监听事件主要是悬浮窗口拖动的监听）最后将设置好的button与layoutParams添加入window中

4、AndroidManifest.xml中权限添加

 <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /><uses-permission android:name="android.permission.INTERNET" />

5、效果图

源码下载地址：Android悬浮窗源码下载