android - Google Map on click of back button going to blank screen -

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i have implemented google map in app. problem whenever click on button going blank page. referred few links find needful . have implemented following code in java file dint find useful.

 public void ondestroy() {        // gmap = null;         super.ondestroy();     }

try putting following in activity.

@override public void onbackpressed() {     finish(); }

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