I wrote a code to display a pop-up window when you select an item in a list activity. The problem is that pressing the Back key does not close the pop-up window. I was asked to catch the back key in the activity, but it was not registered, so I tried to register it in the onkeylistener of the view I sent to the pop-up window as follows.
pop.setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
// // TODO Auto-generated method stub
boolean res=false;
if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {
// // do something on back.
Log.e("keydown","back");
if (pw.isShowing()) {
Log.e("keydown","pw showing");
pw.dismiss();
res = true;
}
} } else {
res = false;
}
return res;
}
});
This is communicated to the pop-up window as follows.
pw = new PopupWindow(
pop,
240,
70,
true);
But it doesn't work either. Help me.
android popupwindow
This problem occurs because the pop-up window does not respond to onTouch or onKey unless it has a non-null background. For help with this issue, see Code here. In general, you can force the issue to be resolved by invoking PopupWindow#setBackgroundDrawable(new BitmapDrawable(). In this case, you do not need to create an onKeyListener separately. You can also call PopupWindow#setOutsideTouchable(true) to make the pop-up window turn off when the user clicks on the area outside the window.
Deepened answer:
The reason why the background should not be null is because of what happens in PopupWindow#preparePopup. If background!= null, it creates an instance of PopupViewContainer and calls setBackgroundDrawable to place the view in it. PopupViewContainer is basically FrameLayout that responds to touch events and KeyEvent.KEYCODE_BACK events. However, if the background is null, it does not respond to any events and uses the developer-generated view. To resolve this issue, instead of using PopupWindow, you can extend the top-level ViewGroup to work as the question asks.
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