java.lang.RuntimeException: Unable to start activity ComponentInfo{noob.com.noobfilechooser/com.noob.noobfilechooser.NoobFileActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.

Stack Overflow | noob | 2 months ago
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Root Cause Analysis

  1. java.lang.IllegalStateException

    This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.

    at android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar()
  2. Android v7
    AppCompatActivity.setSupportActionBar
    1. android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar(AppCompatDelegateImplV9.java:199)
    2. android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:130)
    2 frames
  3. com.noob.noobfilechooser
    NoobFileActivity.onCreate
    1. com.noob.noobfilechooser.NoobFileActivity.onCreate(NoobFileActivity.java:60)
    1 frame
  4. Android Platform
    ActivityThread.main
    1. android.app.Activity.performCreate(Activity.java:6323)
    2. android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1108)
    3. android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2387)
    4. android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2494)
    5. android.app.ActivityThread.access$900(ActivityThread.java:153)
    6. android.app.ActivityThread$H.handleMessage(ActivityThread.java:1347)
    7. android.os.Handler.dispatchMessage(Handler.java:102)
    8. android.os.Looper.loop(Looper.java:148)
    9. android.app.ActivityThread.main(ActivityThread.java:5451)
    9 frames
  5. Java RT
    Method.invoke
    1. java.lang.reflect.Method.invoke(Native Method)
    1 frame
  6. Android
    ZygoteInit.main
    1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
    2 frames