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android.app.Application cannot be cast to com.facebook.react.ReactApplication

See original GitHub issue

After install the UIExplorer Example via adb install /xxx/.../app-debug.apk, but failed to lauch it.

adb logcat, give me the following error logs.

E/AndroidRuntime(32698): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.facebook.react.uiapp/com.facebook.react.uiapp.UIExplorerActivity}: java.lang.ClassCastException: android.app.Application cannot be cast to com.facebook.react.ReactApplication
E/AndroidRuntime(32698):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2341)
E/AndroidRuntime(32698):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2403)
E/AndroidRuntime(32698):    at android.app.ActivityThread.access$800(ActivityThread.java:154)
E/AndroidRuntime(32698):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
E/AndroidRuntime(32698):    at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime(32698):    at android.os.Looper.loop(Looper.java:135)
E/AndroidRuntime(32698):    at android.app.ActivityThread.main(ActivityThread.java:5298)
E/AndroidRuntime(32698):    at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(32698):    at java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime(32698):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:910)
E/AndroidRuntime(32698):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:705)
E/AndroidRuntime(32698): Caused by: java.lang.ClassCastException: android.app.Application cannot be cast to com.facebook.react.ReactApplication
E/AndroidRuntime(32698):    at com.facebook.react.ReactActivity.getReactNativeHost(ReactActivity.java:79)
E/AndroidRuntime(32698):    at com.facebook.react.ReactActivity.onCreate(ReactActivity.java:107)
E/AndroidRuntime(32698):    at com.facebook.react.uiapp.UIExplorerActivity.onCreate(UIExplorerActivity.java:44)
E/AndroidRuntime(32698):    at android.app.Activity.performCreate(Activity.java:6049)
E/AndroidRuntime(32698):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
E/AndroidRuntime(32698):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2294)
E/AndroidRuntime(32698):    ... 10 more

Issue Analytics

State:
Created 7 years ago
Comments:7 (1 by maintainers)

Top GitHub Comments

47reactions

greena13commented, Jul 7, 2016

@pauliusuza Adding the following to AndroidManifest.xml seems to have fixed for me - or at least changed the error that I am getting - trying to solve that now.

 <application
   android:name=".MainApplication"

12reactions

dsimmonscommented, Jul 19, 2016

Just ran into this myself while upgrading 0.28.0 -> 0.29.2.

Running react-native upgrade made all of the appropriate changes automatically _EXCEPT_ the change mentioned above.

For posterity:

<!-- $PWD/android/app/src/main/AndroidManifest.xml -->

    <application
      android:name=".MainApplication"

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