Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your 解决

ava.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.
2021-02-05 23:38:26.891 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3313)
2021-02-05 23:38:26.891 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3462)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2049)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.os.Handler.dispatchMessage(Handler.java:107)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.os.Looper.loop(Looper.java:228)
2021-02-05 23:38:26.892 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.ActivityThread.main(ActivityThread.java:7589)
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG:     at java.lang.reflect.Method.invoke(Native Method)
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG:     at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:953)
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG: Caused by: 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.
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG:     at androidx.appcompat.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:572)
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG:     at androidx.appcompat.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:159)
2021-02-05 23:38:26.893 18391-18391/com.anguomob.sudoku E/DEBUG:     at com.anguomob.total.utils.ToolbarUtils.setToobar(ToolbarUtils.java:33)
2021-02-05 23:38:26.894 18391-18391/com.anguomob.sudoku E/DEBUG:     at com.anguomob.total.activity.AboutActivity.onCreate(AboutActivity.kt:25)
2021-02-05 23:38:26.894 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.Activity.performCreate(Activity.java:7893)
2021-02-05 23:38:26.894 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.Activity.performCreate(Activity.java:7880)
2021-02-05 23:38:26.894 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1307)
2021-02-05 23:38:26.894 18391-18391/com.anguomob.sudoku E/DEBUG:     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3288)

是由于Theme没有用对导致的

修改为

  

   

    

     

    
    

     
    
      <style name="NoBarTheme" parent="Theme.AppCompat.DayNight.NoActionBar">
      
     
    
   

    

     

    
    

     
        
      <item name="android:windowActionBar">false
      </item>
     
    
   

    

     

    
    

     
        
      <item name="android:windowNoTitle">true
      </item>
     
    
   

    

     

    
    

     
    
      </style>
     
    
  

  

   

    

     

    
    

     
   
      <activity
     
    
   

    

     

    
    

     
            
      android:name=
      "com.anguomob.total.activity.PolicyAgreementActivity"
     
    
   

    

     

    
    

     
            
      android:theme=
      "@style/NoBarTheme" />
     
    
  

即可