WindowManger

create a windowmanger,which can receive key events,and do not prevent the events.

public class MainActivity extends AppCompatActivity

{

private WindowManager mWindowManager;
private WindowManager.LayoutParams mLParams;
private ImageView mPopupView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initWM();
initPopupView();
}

@Override
protected void onDestroy() {
super.onDestroy();
mWindowManager.removeView(mPopupView);
}

private void initWM()
{
mWindowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
mLParams = new WindowManager.LayoutParams(
WindowManager.LayoutParams.WRAP_CONTENT, //w
WindowManager.LayoutParams.WRAP_CONTENT, //h
WindowManager.LayoutParams.TYPE_PHONE, //type,设置显示的类型，TYPE_PHONE指的是来电话的时候会被覆盖，其他时候会在最前端显示

WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON //flag
| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
| WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL, //不阻塞事件传递到后面的窗口
PixelFormat.TRANSLUCENT // 不设置这个弹出框的透明遮罩显示为黑色
);
//设置对齐方式
mLParams.gravity = Gravity.CENTER;
//设置显示的位置
mLParams.x = 0; //base on gravity
mLParams.y = 0;
}

private void initPopupView()
{
mPopupView = new ImageView(this);
mPopupView.setImageResource(R.mipmap.ic_launcher);
// mPopupView.setFocusable(true);
mPopupView.setFocusableInTouchMode(true); //enable receive key events
mPopupView.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View view, int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK
&& event.getRepeatCount() == 0
&& event.getAction() == KeyEvent.ACTION_UP) {
Toast.makeText(MainActivity.this, "press back key", Toast.LENGTH_SHORT).show();
} else if (keyCode == KeyEvent.KEYCODE_ENTER
&& event.getRepeatCount() == 0
&& event.getAction() == KeyEvent.ACTION_UP) {
Toast.makeText(MainActivity.this, "press enter key", Toast.LENGTH_SHORT).show();

} else {
Toast.makeText(MainActivity.this, "press key:keyCode="+keyCode, Toast.LENGTH_SHORT).show();

}
return false;
}
});
}

private boolean mbVisible;

public void onClick(View view) {
if (mbVisible = !mbVisible) {
mWindowManager.addView(mPopupView, mLParams); //show View
} else {
mWindowManager.removeViewImmediate(mPopupView); //remove View
}
}

}

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