Android 结合WindowManager和WindowManager.LayoutParams显示窗口及BACK/HOME按键监听
16lz
2021-01-23
一 声明对象
private WindowManager mWindowManager; private WindowManager.LayoutParams mWindowLayoutParams; private View mScreenshotLayout;二 创建对象
// Setup the window that we are going to use mWindowLayoutParams = new WindowManager.LayoutParams( ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 0, 0, isRom ? WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL : WindowManager.LayoutParams.TYPE_SCREENSHOT, WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED, PixelFormat.TRANSLUCENT); mWindowLayoutParams.setTitle("ScreenshotAnimation"); mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE); LayoutInflater layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); mScreenshotLayout = layoutInflater.inflate(R.layout.global_screenshot, null);备注：
A android.view.WindowManager.LayoutParams.LayoutParams(int w, int h, int xpos, int ypos, int _type, int _flags, int _format)
B WindowManager.LayoutParams.TYPE_STATUS_BAR_PANEL 和 WindowManager.LayoutParams.TYPE_SCREENSHOT窗口级别
Ｃ 常改变的属性：
mWindowLayoutParams.flags
mWindowLayoutParams.privateFlags
mWindowLayoutParams.screenOrientation
// mWindowLayoutParams.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE;
// mWindowLayoutParams.screenOrientation = ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT;
三 显示窗口
mWindowManager.addView(mScreenshotLayout, mWindowLayoutParams);四 监听BACK/HOME按键
mScreenshotLayout.setOnKeyListener(new View.OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { switch (event.getKeyCode()) { case KeyEvent.KEYCODE_HOME: // TODO return true; case KeyEvent.KEYCODE_BACK: // TODO return true; } return false; } }); mScreenshotLayout.post(new Runnable() { @Override public void run() { mScreenshotLayout.setFocusable(true); mScreenshotLayout.setFocusableInTouchMode(true); mScreenshotLayout.requestFocus(); } });注意：监听BACK/监听HOME按键时必须使得相应的View获取焦点(如上 使用post方式取得焦点)，否则setOnKeyListener的onKey方法永远不会被回调，按键就监听不到！
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