android studio Error running ：Default Activity not found

运行时提示 default activity not found
解决方法
在AndroidManifest.xml中填入activity标签信息即可

<div>
    <application android:allowBackup="true"    android:icon="@mipmap/ic_launcher"
   android:label="@string/app_name" android:supportsRtl="true" android:theme="@style/AppTheme">
  <activity android:name=".MainActivity">
  <intent-filter>
   <action android:name="android.intent.action.MAIN" />
   <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
  </activity>
    </application>
</div>