Android Studio：You need to use a Theme.AppCompat theme (or descendant) with this activity. AlertDial
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有两个解决办法：
1. 把我们当前的Activity所继承的ActionBarActivity，改为继承Activity（android.app.Activity）。
2.我出现错误的地方是因为使用了AlertDialog，发现我导入的android.support.v7.app.AlertDialog，然后我就改为导入android.app.AlertDialog就成功了。
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