![]() NullPointerExceptionĪ NullPointerException occurs when you use a reference that points to ‘no location’ in memory (null) as though you’re referencing an object. If you’re using a physical Android tablet or smartphone, then it’s time to spring clean your device to free up some space, for example, by uninstalling apps or clearing out some media files. In the window that appears, select ‘Show Advanced Settings,’ scroll to the ‘Memory and Storage’ section and increase the amount of space available to your AVD. If you’re using an AVD, close it and launch the ‘AVD Manager.’ Find the AVD you want to use, then click the ‘Edit’ icon. This error may occur when you attempt to install your project on an Android Virtual Device (AVD) or physical Android device, and the device doesn’t have enough storage available. If this doesn’t work, then check that the package names you’re using in your classes, match the package name in your project’s Manifest. If you’re encountering this error, then try cleaning (Clean > Build Project) and rebuilding your project (Build > Rebuild Project). ![]() To resolve this error, navigate to the section of your code indicated in the error message, and then check what object(s) are being cast here. A ClassCastException indicates that you’ve tried to cast an object to a subclass that it’s not an instance of, for example attempting to cast a String to an Integer. ![]() Java allows you to cast variables of one type to another, as long as this casting happens between compatible data types. Usually, this means you forgot to declare the Activity in your Manifest. This exception is thrown when a call to startActivity fails because the Activity cannot be found. Click here to enlarge the infographicĪndroid Errors List: 11 common errors and how to fix them 1. ![]() You attach your device or launch the Android Virtual Device (AVD) you created especially for this occasion, tell Android Studio to install your APK-and it doesn’t work.ĭon’t panic! Simply work your way down this infographic to find out exactly what’s preventing your app from running, and how you can fix it. After days of toiling away at your latest Android project, you’ve finally reached the point where you’re ready to put all your hard work to the test.
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