java.lang.IllegalStateException: You need to use a theme.appcompat theme (or descendant) with this activity
错误描述：java.lang.IllegalStateException: You need to use a theme.appcompat theme (or descendant) with this activity
产生原因：Activity继承自AppCompatActivity，在style.xml中使用了不兼容的Theme。
从错误提示中提到Theme.AppCompat theme，这是因为我们的activity一定是继承了兼容包中的类，
比如我这里就无意中继承了AppCompatActivity，它来自android.support.v7.app.AppCompatActivity。
所以就要使用与其配合的AppCompat的theme才行。
解决：1、使用AppCompat theme；
2、直接继承自Activity。
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