java - 'cannot resolve symbol R' android studio error -


execution failed task :app:mergedebugresources. error , how fix it?

<uses-permission android:name="android.permission.access_coarse_location" /> <uses-permission android:name="android.permission.internet" />  <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>     <!-- attention: auto-generated add google play services project          app indexing.  see https://g.co/appindexing/androidstudio more information. -->     <meta-data         android:name="com.google.android.gms.version"         android:value="@integer/google_play_services_version" /> </application>

this xml above... , below oncreate() setcontentview(r.layout.activity_main) causing problem:

cannot resolve symbol r

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      locationmanager = (locationmanager) getsystemservice(context.location_service);      provider = locationmanager.getbestprovider(new criteria(), false);      // attention: auto-generated implement app indexing api.     // see https://g.co/appindexing/androidstudio more information.     client = new googleapiclient.builder(this).addapi(appindex.api).build(); }

'cannot resolve symbol r' error occurs , 'symbol r' turns red in color whenever gradle sync not completed. hence before running project advisable first sync project if dependencies or have been added , clean project , run it.

it should solve problem.


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