Android实现悬浮窗全系统版本

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;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  //初始化view
  initView();
 }
 //初始化view
 private 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));
  }

 }

 @Override
 protected 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));
   }
  }
 }

 @Override
 public 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">

 <Button
  android: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;

 @Override
 public 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
 @Override
 public IBinder onBind(Intent intent) {
  Log.e("进入服务2", "进入服务2");

  return null;
 }

 @Override
 public 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;

  @Override
  public 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

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