title: android unresolved class .MainActivity errors in manifest file
body: <p></p>
  
  <pre><code>    &lt;meta-data
          android:name="..."
          android:value=" ...."/&gt;
  
      &lt;activity
          android:name=".MainActivity"
          android:theme="@style/AppTheme.NoActionBar"&gt;
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
  
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
      &lt;/activity&gt;
  
  
  &lt;/application&gt;
  </code></pre>
  
  <p>android:name=".MainActivity" here problem. MainActivity unresolved class ?</p>
  
  <p>I want to install my app on google play. But when loading apk it gave com.example error. So I changed the package name. Then I got this error in the manifest file. There are even red errors in the src section of the project.</p>