Android 捕捉HOME键

 @Override
	    public boolean onKeyDown(int keyCode, KeyEvent event) {
	        if (keyCode == KeyEvent.KEYCODE_HOME) {
	            return true;
	        } else {
	            return super.onKeyDown(keyCode, event);
	        }
	    }
	
	@Override
    public void onAttachedToWindow() {
        this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
        super.onAttachedToWindow();
    }