This is a simple text and button app. An Android app uses XML for widgets and layout. This is communicated to Java via an automatically create R class when it is being built.
Running the app the first time in Netbeans will invoke the Android Virtual Device. However, it will take some time for it (avd) to startup, and the netbeans will give up and fail to run the app. You can start the AVD manually first, or just simply re-run the app from Netbeans.
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