求大神给我看一下
 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.anew/com.anew.MainActivity}: 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.app.ActivityThread.performLaunchActivity(ActivityThread.java:2688)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2749)
    at android.app.ActivityThread.-wrap12(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1498)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:160)
    at android.app.ActivityThread.main(ActivityThread.java:6197)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:874)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:764)
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.
    at android.support.v7.app.AppCompatDelegateImplV9.setSupportActionBar(AppCompatDelegateImplV9.java:207)
    at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:130)
    at com.anew.MainActivity.onCreate(MainActivity.java:19)
    at android.app.Activity.performCreate(Activity.java:6736)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2641)
    ... 9 more
拜托各位大神看下，有个报错空指针，试了一天了。诶~。~、、

qq_27049279

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