Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant)

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.healthmanager/com.example.healthmanager.LoginActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

解决办法：检查 values 目录下的 style.xml文件，修改定义的style名称和parent，是否有多的 </style>标签，修改Theme例如：

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

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