How to catch device back button event in android? -

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i have open pdf file through application.when click on device button automatically come application .it working fine.here want catch button event in device.i override button.but not working.please me.

this example of asking: 

@override public boolean onkeydown(int keycode, keyevent event) {     if (keycode == keyevent.keycode_back ) {         //do stuff     }     return super.onkeydown(keycode, event); }

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