Issue with Android emulator If you want to deploy the APK to an Android Emulator and you see the “Error installing APK” message, your emulator may be frozen and need restart. Then unfortunately a gradle refresh isn’t enough, you have to go to Build -> Clean Project and then Run again. Other edge case If you see this error: INSTALL_FAILED_INVALID_APK:… signatures are inconsistent. Try Invalid Caches/restart Go to File-> Invalid Caches/Restart.
One tip if these solutions don’t help you: If you open the Event Log window in the right bottom corner of Android Studio, you can see a detailed error message. To protect android from maleware it is not allowed to update an app that has a different signing-key (debug-build uses a different signing key than release) Uninstall previous debug-build-app before installing release-build-app. (If you don’t have the sdk/platform-tools in the PATH environment variable, then you should open a terminal in that folder)
Usually after a few hours of inactivity, adb used to disconnect the device. Open terminal window and type “adb kill-server”, then type “adb start-server”. Open Gradle window (on the right side in Android Studio) and click on the refresh button. In newer Android Studio versions you can re-sync the project using this button:
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