Now I have solved this problem. The cursor DB n was not closed properly. when I pressed the back button, it became broken. so i used this code
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == ACTIVITY_EDIT )
{
finish();
}
}
we can close all databases with this activity.
Thanks everyone for the suggestions. enjoy the care :)
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