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ClassNotFoundException for activity after signing apk

While I am testing the debug version of my application - everything is in order. After I sign it for the release of Google Play, it starts FC with the following exception:

java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.wiagames.guitartuner/com.wiagames.guitartuner.activities.MainActivity}: java.lang.ClassNotFoundException: com.wiagames.guitartuner.activities.MainActivity at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1983) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) at android.app.ActivityThread.access$600(ActivityThread.java:130) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4745) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassNotFoundException: com.wiagames.guitartuner.activities.MainActivity at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61) at java.lang.ClassLoader.loadClass(ClassLoader.java:501) at java.lang.ClassLoader.loadClass(ClassLoader.java:461) at android.app.Instrumentation.newActivity(Instrumentation.java:1053) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1974)

manifest:

  <application android:label="@string/app_name" android:icon="@drawable/ic_launcher"> <activity android:name=".activities.MainActivity" android:label="@string/app_name" android:configChanges="orientation|keyboardHidden" android:theme="@style/AppTheme"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <activity android:name="com.google.ads.AdActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"/> </application>

How to fix it?

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2 answers

if you get a ClassNotFoundException, you need to write the package that the Activity is in

  activity android:name="com.wiagames.guitartuner.activities.MainActivity"

your Android Manifest.xml should look like this:

  <activity android:name="com.wiagames.guitartuner.activities.MainActivity" android:label="@string/app_name" android:configChanges="orientation|keyboardHidden" android:theme="@style/AppTheme"> <intent-filter> <action android:name="android.intent.action.MAIN"/> <category android:name="android.intent.category.LAUNCHER"/> </intent-filter> </activity> <activity android:name="com.google.ads.AdActivity" android:configChanges="keyboard|keyboardHidden|orientation|screenLayout|uiMode|screenSize|smallestScreenSize"/> </application>
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Could you place the application manifest file?

My suspicion is that the announcement of the operation is incorrect.

It should look something like this:

 <activity android:name="com.wiagames.guitartuner.activities.MainActivity" />

Or, if you already have a package declaration, it should like:

 <activity android:name=".activities.MainActivity" />

Please note that you need to specify the start period (ie ".") In the name.

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