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• permission elements to declare permissions that activities or services might require other applications hold in order to use your application’s data or logic. Again, more details are forthcoming in Chapter 29.. If you setuses-sdk, the application will install only on compatible devices. You do not have to specify the latest SDK, but if you choose an older one, it is up to you to ensure your application works on every SDK version you claim is compatible. For example, if you leave offuses-sdk, in effect you are stipulating that your application works on every Android SDK version ever released, and it is up to you to test your application to determine if this is indeed the case.. The root element needs to declare the Android XML namespace:. Here are some other adapters in Android that you will likely use:.  .  android:layout_width=”fill_parent”.