Android floating window that can move anywhere

 1. Floating window permission application :

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.M) {
   if (!Settings.canDrawOverlays(getApplicationContext())) {
        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
        startActivityForResult(intent, 0);
    } else {
        mIntent = new Intent(MainActivity.this/*需要启动service的activity*/, FloatWindowService.class/*需要启动的service*/);
        bindService(mIntent, serviceConnection, Context.BIND_AUTO_CREATE);//直接启动服务方式启动
    }
}

private ServiceConnection serviceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
    
    }

    @Override
    public void onServiceDisconnected(ComponentName name) {

    }
};

Call back the result of requesting permission in Activity:

@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data){
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 0) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (Settings.canDrawOverlays(this)) {
                Intent mIntent = new Intent(MainActivity.this,FloatWindowService.class);
                startService(mIntent);//直接启动服务方式启动
            }
        }
    }
}

2. Create a floating window:

wp = new WindowManager.LayoutParams();
mWindowManager = (WindowManager) getApplication().getSystemService(WINDOW_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
	wp.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
} else {
	wp.type = WindowManager.LayoutParams.TYPE_PHONE;
}
wp.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;//悬浮窗外部可点击
wp.gravity = Gravity.LEFT | Gravity.TOP;//悬浮窗弹出显示位置
wp.x = 0;
wp.y = 0;

wp.width = WindowManager.LayoutParams.WRAP_CONTENT;
wp.height = WindowManager.LayoutParams.WRAP_CONTENT;

LayoutInflater inflater = LayoutInflater.from(getApplication());
mFloatLayout = (LinearLayout) inflater.inflate(R.layout.float_window, null, false);
View view = mFloatLayout.findViewById(R.id.playMonitor);//自定义悬浮窗布局
view.setOnTouchListener(this);//设置移动监听，此处view是自定义充满布局的控件
mWindowManager.addView(mFloatLayout, wp);

3. Set up sliding monitoring:

private int mTouchStartX, mTouchStartY, mStartX, mStartY, mTouchCurrentX, mTouchCurrentY;

@SuppressLint("ClickableViewAccessibility")
@Override
public boolean onTouch(View v, MotionEvent event) {
	switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			mTouchStartX = (int) event.getRawX();
			mTouchStartY = (int) event.getRawY();
			mStartX = (int) event.getX();
			mStartY = (int) event.getY();
			break;
		case MotionEvent.ACTION_MOVE:
			mTouchCurrentX = (int) event.getRawX();
			mTouchCurrentY = (int) event.getRawY();
			wp.x += mTouchCurrentX - mTouchStartX;
			wp.y += mTouchCurrentY - mTouchStartY;
			mWindowManager.updateViewLayout(mFloatLayout, wp);

			mTouchStartX = mTouchCurrentX;
			mTouchStartY = mTouchCurrentY;
	}
	return true;
}

4. PS: The floating window here is implemented in the service, which is mostly used as a media player, and task management when the app is not on the top of the stack. Demo: https://download.csdn.net/download/mozushixin_1/12966330

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