android 浮動在activity 上的button

轉載：

1: 加入權限<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

2：

private WindowManager wm = null; 

private WindowManager.LayoutParams wmParams = null; 

private Button play1; 

 

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        //初始化懸浮按鈕

 

    }

    @Override 

    protected void onResume() { 

    // TODO Auto-generated method stub 

    //啓動的方法不用寫在oncreate中 

    super.onResume(); 

    play1 = new Button(this); 

    initFloatview(); 

    } 

 

    @Override 

    protected void onPause() { 

    // TODO Auto-generated method stub 

    super.onPause(); 

    //退出時刪除 

    wm.removeView(play1); 

    } 

 

    private void initFloatview() { 

    wm = (WindowManager) getApplicationContext().getSystemService("window"); 

    wmParams = new WindowManager.LayoutParams(); 

    wmParams.type = LayoutParams.TYPE_PHONE; 

    wmParams.format = PixelFormat.RGBA_8888; 

    wmParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL 

    | LayoutParams.FLAG_NOT_FOCUSABLE; 

    play1.getBackground().setAlpha(100); 

    play1.setText("播放"); 

    wmParams.width = 210; 

    wmParams.height = 60; 

    wmParams.gravity = Gravity.LEFT | Gravity.TOP; 

    wmParams.x = 30; 

    wmParams.y = 110; 

    wm.addView(play1, wmParams); 

 

    }