Errors

Graphic

Scaling of sprite is incorrect or seems weird

Drawables are not loaded with the option inScaled=true in conjunction with the BitmapFactory class.

Android specific

Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {XXX}; have you declared this activity in your AndroidManifest.xml?

This error occurs when you try to start an activity but isn't declared in the AndroidManifest.xml

Solution

Put this in your AndroidManifest.xml:

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<application
    ... >

    <activity android:name="XXX">

    </activity>

</application>

Gradle

Wrong SDK version

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* What went wrong:
Execution failed for task ':app:processDebugManifest'.
> Manifest merger failed with multiple errors, see logs
  • The minSDK Version has to be 18

  • minSDKVersion of build.gradle should match with minSDKVersion of the AndroidManifest.xml

  • Add the attribut tools:node="replace" in your AndroidManifest.xml

    • Don't forget the namespace in <manifest/>: xmlns:tools="http://schemas.android.com/tools"

  • No resource identifier found for attribute 'layout_constraintBottom_toBottomOf' in package 'XXX'

    • I was finally able to build the project after setting the compile verstion, minimum target and target version to API level 24. Afterwards I could set back the minimum version to API level 19 and the project is still compiling
    • Or: put Constraint-Layout dependencies in your gradle.build file

Exception messages

Exception Message Meaning
IllegalStateException No state defined no state was defined yet but the drawView component and the RenderThread was started
IllegalStateException State is not added to the StateManager The RenderThread was called, and a state was set as current state but was not added to the StateManager