This is a new project created by the android studio. I did not change anything in this project, but in the activity_main.xml file, MainActivity.java can not find, and there is a MainActivity.java file in this project. How I can make this run. (MainActivity.java see activity_main.xml as related )
If you really haven't made any changes prior to this happening, try cleaning and rebuilding the project in the build tab. If it doesn't work, try restarting Android studio.
It's not get accourate path of your package. You can Use com.example.myapplication.MainActivity
that times it's work properly.
OR
Invalid caches/restart android studio.
Add your activity to AndroidManifest.xml
under <application>
<activity android:name=".MainActivity" >
<intent-filter>
<!-- MAIN represents that it is the Main Activity-->
<action android:name="android.intent.action.MAIN" />
<!-- Launcher Denotes that it will be the first launching activity-->
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
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