title: error in com.google.android.gms.common.api.GoogleApiClient$ConnectionCallbacks
body: <p>I am new to Android, currently I am working on a very basic Google map. and getting this error.
  Could anybody please help me out on this?</p>
  
  <p>Here is the error in logcat</p>
  
  <pre><code>`07-02 10:49:20.882  25215-25215/com.example.prashant.nuhani_go      E/AndroidRuntime﹕ FATAL EXCEPTION: main
      Process: com.example.prashant.nuhani_go, PID: 25215
      java.lang.RuntimeException: Unable to start activity     ComponentInfo{com.example.prashant.nuhani_go/com.example.prashant.nuhani_go.seco ndLocationChoosen}:     java.lang.ClassCastException:  com.example.prashant.nuhani_go.secondLocationChoosen cannot be cast to   com.google.android.gms.common.api.GoogleApiClient$ConnectionCallbacks
              at     android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
              at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
              at android.app.ActivityThread.access$800(ActivityThread.java:151)
              at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
              at android.os.Handler.dispatchMessage(Handler.java:102)
              at android.os.Looper.loop(Looper.java:135)
          at android.app.ActivityThread.main(ActivityThread.java:5254)
          at java.lang.reflect.Method.invoke(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:372)
          at     com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
       Caused by: java.lang.ClassCastException:     com.example.prashant.nuhani_go.secondLocationChoosen cannot be cast to com.google.android.gms.common.api.GoogleApiClient$ConnectionCallbacks
          at com.example.prashant.nuhani_go.secondLocationChoosen.onCreate(secondLocationChoosen.java:46)
          at android.app.Activity.performCreate(Activity.java:5990)
          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278).....
  </code></pre>
  
  <p>        </p>
  
  <p>my java file :</p>
  
  <pre><code>      package com.example.prashant.nuhani_go;
        import android.support.v7.app.ActionBarActivity;
        import android.os.Bundle;
        import android.view.Menu;
        import android.view.MenuItem;
        import android.view.View;
        import android.widget.AutoCompleteTextView;
        import android.widget.Button;
        import android.widget.EditText;
        import com.google.android.gms.common.ConnectionResult;
        import com.google.android.gms.common.api.GoogleApiClient;
        import    com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
        import com.google.android.gms.location.places.Places;
  
  
       public class secondLocationChoosen extends ActionBarActivity {
  private GoogleApiClient mGoogleApiClient;
  private AutoCompleteTextView mAutocompleteView;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_second_location_choosen);
  
    // Checking the destination and starting location, they shouldn't be empty
     final EditText editText3 =(EditText)findViewById(R.id.editText3);
     final EditText editText4 =(EditText)findViewById(R.id.editText4);
          Button button2 = (Button)findViewById(R.id.button2);
      button2.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
              if( editText3.getText().toString().length() == 0 )
                  editText3.setError( "This field cannot be empty !" );
              if( editText4.getText().toString().length() == 0 )
                  editText4.setError( "This field cannot be empty !" );
          }
      });
  
  
      // Construct a GoogleApiClient for the {@link Places#GEO_DATA_API} using AutoManage
      // functionality, which automatically sets up the API client to handle Activity lifecycle
      // events. If your activity does not extend FragmentActivity, make sure to call connect()
      // and disconnect() explicitly.
      mGoogleApiClient = new GoogleApiClient
              .Builder(this)
              .addApi(Places.GEO_DATA_API)
              .addApi(Places.PLACE_DETECTION_API)
              .addConnectionCallbacks((ConnectionCallbacks) this)
              .addOnConnectionFailedListener((GoogleApiClient.OnConnectionFailedListener) this)
              .build();
  
  
      // Retrieve the AutoCompleteTextView that will display Place suggestions.
      //mAutocompleteView = (AutoCompleteTextView)
      //        findViewById(R.id.place);
      // Register a listener that receives callbacks when a suggestion has been selected
      //mAutocompleteView.setOnItemClickListener(mAutocompleteClickListener);
  
  
  }
  
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.menu_second_location_choosen, menu);
      return true;
  }
  
  @Override
  protected void onStart() {
      super.onStart();
      mGoogleApiClient.connect();
  }
  
  @Override
  protected void onStop() {
      mGoogleApiClient.disconnect();
      super.onStop();
  }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      // Handle action bar item clicks here. The action bar will
      // automatically handle clicks on the Home/Up button, so long
      // as you specify a parent activity in AndroidManifest.xml.
      int id = item.getItemId();
  
      //noinspection SimplifiableIfStatement
      if (id == R.id.action_settings) {
          return true;
      }
  
      return super.onOptionsItemSelected(item);
  }
  }
  </code></pre>
  
  <p>I have enabled google maps api, and I have also added my key in the manifest file. </p>