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Duplicate id @+id/textView1, already defined earlier in this layout



This is a Lint error message, which means that you have assigned the same @+id to two or more elements (Views) in your layout.xml file.

The id that you assign to the Views (TextViews, EditText, ImageViews, Buttons or layouts like LinearLayouts, GridLayout, TableLayout, TableRow etc) must be unique or else when you would try to access them by its ID in your java code ( eg. findViewById(R.id.textView1) you may get an exception.

Solution



    Just double click on the error message under Lint Warning and it will take you to the place where you have a conflict of Duplicate id. Rename it to something unique and the issue will be resolved.



Note : If you wish to have certain Views to have the same ID then you may have to suppress this Lint Error message, you can achieve this by going to Preferences -> Android -> Lint Error Checking and search DuplicateIds, change its severity from Fatal to Warning. Clean + Build your project and you may no more get the duplicate id error.



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