title: Inconvertible types; cannot cast 'android.support.v4.app.Fragment' to 'com.google.android.gms.maps.SupportMapFragment'
body: <p>I have created an activity of google maps, and that is when the error pops up, error is coming just after the build of the activity is finished.
  the error is:</p>
  
  <blockquote>
  <pre><code> Inconvertible types; cannot cast 'android.support.v4.app.Fragment' to 'com.google.android.gms.maps.SupportMapFragment'
  </code></pre>
  </blockquote>
  
  <p>in the line(in MapsActivity):</p>
  
  <p>SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                  .findFragmentById(R.id.map);</p>
  
  <p>And I also have entered the API key in the resources !!</p>
  
  <p>imported: </p>
  
  <pre><code>import android.support.v4.app.FragmentActivity;
  
  import com.google.android.gms.maps.CameraUpdateFactory;
  import com.google.android.gms.maps.GoogleMap;
  import com.google.android.gms.maps.OnMapReadyCallback;
  import com.google.android.gms.maps.SupportMapFragment;
  import com.google.android.gms.maps.model.LatLng;
  import com.google.android.gms.maps.model.MarkerOptions;
  </code></pre>
  
  <p>Manifest:</p>
  
  <pre><code>&lt;manifest xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:tools="http://schemas.android.com/tools"
      package="com.purabjain.memorableplaces"&gt;
  
      &lt;!--
           The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
           Google Maps Android API v2, but you must specify either coarse or fine
           location permissions for the 'MyLocation' functionality.
      --&gt;
      &lt;uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /&gt;
  
      &lt;application
          android:allowBackup="true"
          android:icon="@mipmap/ic_launcher"
          android:label="@string/app_name"
          android:roundIcon="@mipmap/ic_launcher_round"
          android:supportsRtl="true"
          android:theme="@style/AppTheme"
          tools:replace="android:appComponentFactory"
          android:appComponentFactory="whateverString"&gt;
  
          &lt;!--
               The API key for Google Maps-based APIs is defined as a string resource.
               (See the file "res/values/google_maps_api.xml").
               Note that the API key is linked to the encryption key used to sign the APK.
               You need a different API key for each encryption key, including the release key that is used to
               sign the APK for publishing.
               You can define the keys for the debug and release targets in src/debug/ and src/release/.
          --&gt;
          &lt;meta-data
              android:name="com.google.android.geo.API_KEY"
              android:value="@string/google_maps_key" /&gt;
  
          &lt;activity
              android:name=".MapsActivity"
              android:label="@string/title_activity_maps"&gt;&lt;/activity&gt;
          &lt;activity android:name=".MainActivity"&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;
  
  &lt;/manifest&gt;
  </code></pre>
  
  <p>build.gradle:</p>
  
  <pre><code>
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.purabjain.memorableplaces"
          minSdkVersion 21
          targetSdkVersion 28
          versionCode 1
          versionName "1.0"
          testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
              proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
          }
      }
  }
  
  dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support:appcompat-v7:28.0.0'
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      implementation 'com.google.android.gms:play-services-maps:17.0.0'
      testImplementation 'junit:junit:4.12'
      androidTestImplementation 'com.android.support.test:runner:1.0.2'
      androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
  }
  
  </code></pre>
  
  <p>MapsActivity:</p>
  
  <pre><code>
  import android.os.Bundle;
  import android.support.v4.app.FragmentActivity;
  
  import com.google.android.gms.maps.CameraUpdateFactory;
  import com.google.android.gms.maps.GoogleMap;
  import com.google.android.gms.maps.OnMapReadyCallback;
  import com.google.android.gms.maps.SupportMapFragment;
  import com.google.android.gms.maps.model.LatLng;
  import com.google.android.gms.maps.model.MarkerOptions;
  
  public class MapsActivity extends FragmentActivity  implements OnMapReadyCallback {
  
      private GoogleMap mMap;
  
      @Override
      protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_maps);
          // Obtain the SupportMapFragment and get notified when the map is ready to be used.
          SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                  .findFragmentById(R.id.map);
          mapFragment.getMapAsync(this);
      }
  
  
      /**
       * Manipulates the map once available.
       * This callback is triggered when the map is ready to be used.
       * This is where we can add markers or lines, add listeners or move the camera. In this case,
       * we just add a marker near Sydney, Australia.
       * If Google Play services is not installed on the device, the user will be prompted to install
       * it inside the SupportMapFragment. This method will only be triggered once the user has
       * installed Google Play services and returned to the app.
       */
      @Override
      public void onMapReady(GoogleMap googleMap) {
         /* mMap = googleMap;
  
          // Add a marker in Sydney and move the camera
          LatLng sydney = new LatLng(-34, 151);
          mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
          mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));*/
      }
  }
  </code></pre>
  
  <p>api.xml:</p>
  
  <pre><code>    &lt;!--
      TODO: Before you run your application, you need a Google Maps API key.
  
      To get one, follow this link, follow the directions and press "Create" at the end:
  
      https://console.developers.google.com/flows/enableapi?apiid=maps_android_backend&amp;keyType=CLIENT_SIDE_ANDROID&amp;r=E6:56:90:82:E2:58:42:66:59:4C:5A:F2:E5:9B:64:06:EC:1E:05:49%3Bcom.purabjain.memorableplaces
  
      You can also add your credentials to an existing key, using these values:
  
      Package name:
      E6:56:90:82:E2:58:42:66:59:4C:5A:F2:E5:9B:64:06:EC:1E:05:49
  
      SHA-1 certificate fingerprint:
      E6:56:90:82:E2:58:42:66:59:4C:5A:F2:E5:9B:64:06:EC:1E:05:49
  
      Alternatively, follow the directions here:
      https://developers.google.com/maps/documentation/android/start#get-key
  
      Once you have your key (it starts with "AIza"), replace the "google_maps_key"
      string in this file.
      --&gt;
      &lt;string name="google_maps_key" templateMergeStrategy="preserve" translatable="false"&gt;AIzaSyDaCq_mx5h741VnM-4tNkNmQiT70yf7ykw&lt;/string&gt;
  &lt;/resources&gt;
  </code></pre>