OverlayService.java 文件源码

@Override
public void onCreate() {
    super.onCreate();

    FrameLayout frameLayout = new FrameLayout(this);

    frameLayout.setBackgroundColor(getResources().getColor(R.color.colorPhoneDark, getTheme()));
    WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);


    //change this through preferences
    int dragWidth = 20;

    WindowManager.LayoutParams params = new WindowManager.LayoutParams(dragWidth, WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.TYPE_SYSTEM_ALERT, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, PixelFormat.TRANSLUCENT);

    //change this through preferences
    params.gravity = Gravity.START;

    params.x = 0;
    params.y = 0;

    frameLayout.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View view, MotionEvent motionEvent) {
            Toast.makeText(OverlayService.this, "yo", Toast.LENGTH_SHORT)
                    .show();
            return false;
        }
    });

    if (windowManager != null) {
        windowManager.addView(frameLayout, params);
    }
}