Method Invocation 'setGravity' may produce java.lang.nullpointerexception-ProgressDialog

Question

I am using ProgressDialog in one of my android application. its showing me warning as above title. I have used it in java like below. This is not duplicate question. I have searched for solution but have not found it.

    mProgress = new ProgressDialog((this),R.style.AlertDialogTheme);
    mProgress.setCancelable(false);
    mProgress.getWindow().setGravity(Gravity.BOTTOM);
    mProgress.getWindow().setBackgroundDrawable(new ColorDrawable(Color.WHITE));

anyone can please suggest me this can cause error or it will not ? how can I solve it ?

You can check for null before setting gravity though like if(progressDialog.getWindow()!=null){mProgress.getWindow().setGravity(Gravity.BOTTOM);} — Sahil Manchanda, Jun 26 '17 at 09:48
this means that `getWindow()` may return null, if the dialog is not attached to a window. — Vladyslav Matviienko, Jun 26 '17 at 09:50

Sanoop Surendran · Accepted Answer · 2017-06-26T09:53:57.553

2

Just assert the warning by,

    Window window = mProgress.getWindow();
    assert window != null;
    window.setGravity(Gravity.BOTTOM);
    window.setBackgroundDrawable(new ColorDrawable(Color.WHITE));

or you can wrap it with a if case by

    Window window = mProgress.getWindow();
    if ( window != null )       
       window.setGravity(Gravity.BOTTOM);
       window.setBackgroundDrawable(new ColorDrawable(Color.WHITE));

And its just a lint warning, you can ignore that.

edited Jun 26 '17 at 09:53

answered Jun 26 '17 at 09:48

Sanoop Surendran

3,484
4
28
49

Thanks.... it have solved :) – Meena Singh Jun 26 '17 at 09:51
@MeenaSingh Please also consider the comment from Vlad Matvienko. There is possibilty of the window will be null. – Krish Jun 26 '17 at 09:58

Method Invocation 'setGravity' may produce java.lang.nullpointerexception-ProgressDialog

1 Answers1