原因： Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead. 解決辦法：

I think you're developing for Android Lollipop, but anyway include this line:

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

to your theme declaration inside of your?app/src/main/res/values/styles.xml.

Also, if you're using?AppCompatActivity?support library of version 22.1 or greater, add this line:

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

Your theme declaration may look like this after all these additions:

<!-- Base application theme. --> <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar"><!-- Customize your theme here. --><item name="colorPrimary">@color/colorPrimary</item><item name="colorPrimaryDark">@color/colorPrimaryDark</item><item name="colorAccent">@color/colorAccent</item><item name="windowActionBar">false</item><item name="windowNoTitle">true</item> </style>

總結

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