This Activity already has an action bar supplied by the window decor.

        在给一个布局添加toolbar的时候出现一个错误

This Activity already has an action bar supplied by the window decor.

        这样在preview里面的确可以看出有2个actionBar



 

        于是只需要在声明这个Activity的时候说明一下NoActionBar就可以啦,具体操作是在AndroidManifest.xml中添加一行代码

 <activity android:name=".view.activity.TypeActivity"
            android:theme="@style/AppTheme.NoActionBar" ></activity>

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转载自2723364262.iteye.com/blog/2312119