android - 无法获取 TYPE_SYSTEM_OVERLAY 的触摸事件

Question

我喜欢开发类似于 Swapps 的应用程序.我正在尝试在任何屏幕顶部显示一个按钮，并且应该只在滑动操作时出现。我尝试使用以下代码

    WindowManager.LayoutParams params = new WindowManager.LayoutParams();
    params.type =WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY;
    params.flags = WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;
    params.format =PixelFormat.TRANSLUCENT; 
    params.height = WindowManager.LayoutParams.WRAP_CONTENT;
    params.width = WindowManager.LayoutParams.WRAP_CONTENT;
    parentlay = new LinearLayout(this);
    mybt = new Button(getApplicationContext());
    bt.setText("Click to Go");

    parentlay.setBackgroundColor(Color.TRANSPARENT);
    parentlay.setHapticFeedbackEnabled(true);
    parentlay.setOnTouchListener(new OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
                // event.getAction() prints 4 and not able to get up or down event
           }
       });
   windowmanager.addView(parentlay, params);

当用户从左向右滑动时，我试图通过捕获该事件并执行

    parentlay.addView(bt);

并在用户从右向左滑动时移除 View

    parentlay.removeView(bt);

如前所述，除非我将类型更改为 TYPE_SYSTEM_ALERT ，否则我无法获得运动事件，但这反过来会卡住所有屏幕并且无法单击返回或主页按钮，是否有任何替代方法可以做到这一点。

我刚试过下面的修改

    params.type =WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
    params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
    |WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
   |WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;

    params.height = WindowManager.LayoutParams.MATCH_PARENT;
    params.width = WindowManager.LayoutParams.MATCH_PARENT;

但我无法点击下面的按钮，可能是由于 MATCH_PARTENT 但如果我将其设置为 wrap_content 则我无法获得点击事件。

Answer 1

要隐藏 View ，您需要调用 mWindowManager.removeView(mOverlay)；

private RelativeLayout mOverlay;
        private WindowManager mWindowManager;   
     WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                        WindowManager.LayoutParams.WRAP_CONTENT,
                        WindowManager.LayoutParams.WRAP_CONTENT,
                        WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,
                        WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                                | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL,
                        PixelFormat.TRANSLUCENT);
                params.gravity = Gravity.TOP;
                LayoutInflater inflater = (LayoutInflater) context
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                mOverlay = (RelativeLayout) inflater
                        .inflate(R.layout.phasechange, null);

                mWindowManager = (WindowManager) context
                        .getSystemService(Context.WINDOW_SERVICE);
                mWindowManager.addView(mOverlay, params);
                Button b = (Button) mOverlay.findViewById(R.id.button1);
                b.setOnClickListener(new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        // TODO Auto-generated method stub
                        mWindowManager.removeView(mOverlay);
                    }
                });

            }