google api client - Error implementing GoogleApiClient Builder for Android development

Question

I am following Google's documentation to implement Google+ Sign In feature into an app.

https://developers.google.com/+/mobile/android/getting-started

I followed each step according to the guide but got stuck in an error generated by the GoogleApiClient.Builder , I searched thoroughly but got no result. Please help me sort it out. Thank you.

Error code:

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this).addApi(Plus.API, null)
            .addScope(Plus.SCOPE_PLUS_LOGIN).build();

Error Message :

   The method addConnectionCallbacks(GoogleApiClient.ConnectionCallbacks) in the type 
   GoogleApiClient.Builder is not applicable for the arguments (MainActivity)

Complete MainActivity.java code :

    package mad.project.mightysatta;

    import android.content.Intent;
    import android.content.IntentSender.SendIntentException;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.support.v7.app.ActionBarActivity;
    import android.view.LayoutInflater;
    import android.view.Menu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.view.ViewGroup;

    import com.google.android.gms.common.ConnectionResult;
    import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
    import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
    import com.google.android.gms.common.api.GoogleApiClient;
    import com.google.android.gms.plus.Plus;

    public class MainActivity extends ActionBarActivity implements
    ConnectionCallbacks, OnConnectionFailedListener {

/* Request code used to invoke sign in user interactions. */
private static final int RC_SIGN_IN = 0;

/* Client used to interact with Google APIs. */
private GoogleApiClient mGoogleApiClient;

/*
 * A flag indicating that a PendingIntent is in progress and prevents us
 * from starting further intents.
 */
private boolean mIntentInProgress;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this).addApi(Plus.API, null)
            .addScope(Plus.SCOPE_PLUS_LOGIN).build();

    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    // getMenuInflater().inflate(R.menu.main, menu);
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main_activity_actions, menu);
    return super.onCreateOptionsMenu(menu);
    // return true;
}

@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();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

@Override
public void onConnectionFailed(ConnectionResult result) {
    // TODO Auto-generated method stub

    if (!mIntentInProgress && result.hasResolution()) {
        try {
            mIntentInProgress = true;
            result.startResolutionForResult(this, // your activity
                    RC_SIGN_IN);
        } catch (SendIntentException e) {
            // The intent was canceled before it was sent. Return to the
            // default
            // state and attempt to connect to get an updated
            // ConnectionResult.
            mIntentInProgress = false;
            mGoogleApiClient.connect();
        }
    }

}

@Override
public void onConnected(Bundle connectionHint) {
    // TODO Auto-generated method stub

}

@Override
public void onDisconnected() {
    // TODO Auto-generated method stub

}

protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
}

protected void onStop() {
    super.onStop();

    if (mGoogleApiClient.isConnected()) {
        mGoogleApiClient.disconnect();
    }
}

protected void onActivityResult(int requestCode, int responseCode,
        Intent intent) {
    if (requestCode == RC_SIGN_IN) {
        mIntentInProgress = false;

        if (!mGoogleApiClient.isConnecting()) {
            mGoogleApiClient.connect();
        }
    }
}

public void onConnectionSuspended(int cause) {
    mGoogleApiClient.connect();
}

    }

In this code if I comment out .addConnectionCallbacks and .addOnConnectionFailedListener , then the error goes away. The error seems to be related with their arguments.

    mGoogleApiClient = new GoogleApiClient.Builder(this)
        //  .addConnectionCallbacks(this)
        //  .addOnConnectionFailedListener(this)
            .addApi(Plus.API, null)
            .addScope(Plus.SCOPE_PLUS_LOGIN).build();

Updated Main Activity , after replacing implements to

    GooglePlayServicesClient.ConnectionCallbacks,
    GooglePlayServicesClient.OnConnectionFailedListener

MainActivity.java(Updated)

    package mad.project.mightysatta;

    import android.content.Intent;
    import android.content.IntentSender.SendIntentException;
    import android.os.Bundle;
    import android.support.v4.app.Fragment;
    import android.support.v7.app.ActionBarActivity;
    import android.view.LayoutInflater;
    import android.view.Menu;
    import android.view.MenuInflater;
    import android.view.MenuItem;
    import android.view.View;
    import android.view.ViewGroup;

    import com.google.android.gms.common.ConnectionResult;
    import com.google.android.gms.common.GooglePlayServicesClient;
    import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;
    import com.google.android.gms.common.GooglePlayServicesClient.OnConnectionFailedListener;
    import com.google.android.gms.common.api.GoogleApiClient;
    import com.google.android.gms.plus.Plus;

    public class MainActivity extends ActionBarActivity implements
    GooglePlayServicesClient.ConnectionCallbacks,
    GooglePlayServicesClient.OnConnectionFailedListener {

/* Request code used to invoke sign in user interactions. */
private static final int RC_SIGN_IN = 0;

/* Client used to interact with Google APIs. */
private GoogleApiClient mGoogleApiClient;

/*
 * A flag indicating that a PendingIntent is in progress and prevents us
 * from starting further intents.
 */
private boolean mIntentInProgress;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(Plus.API, null)
            .addScope(Plus.SCOPE_PLUS_LOGIN).build();

    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment()).commit();
    }

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    // getMenuInflater().inflate(R.menu.main, menu);
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main_activity_actions, menu);
    return super.onCreateOptionsMenu(menu);
    // return true;
}

@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();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

/**
 * A placeholder fragment containing a simple view.
 */
public static class PlaceholderFragment extends Fragment {

    public PlaceholderFragment() {
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_main, container,
                false);
        return rootView;
    }
}

@Override
public void onConnectionFailed(ConnectionResult result) {
    // TODO Auto-generated method stub

    if (!mIntentInProgress && result.hasResolution()) {
        try {
            mIntentInProgress = true;
            result.startResolutionForResult(this, // your activity
                    RC_SIGN_IN);
        } catch (SendIntentException e) {
            // The intent was canceled before it was sent. Return to
            // default
            // state and attempt to connect to get an updated
            // ConnectionResult.
            mIntentInProgress = false;
            mGoogleApiClient.connect();
        }
    }

}

@Override
public void onConnected(Bundle connectionHint) {
    // TODO Auto-generated method stub

}

@Override
public void onDisconnected() {
    // TODO Auto-generated method stub

}

protected void onStart() {
    super.onStart();
    mGoogleApiClient.connect();
}

protected void onStop() {
    super.onStop();

    if (mGoogleApiClient.isConnected()) {
        mGoogleApiClient.disconnect();
    }
}

protected void onActivityResult(int requestCode, int responseCode,
        Intent intent) {
    if (requestCode == RC_SIGN_IN) {
        mIntentInProgress = false;

        if (!mGoogleApiClient.isConnecting()) {
            mGoogleApiClient.connect();
        }
    }
}

public void onConnectionSuspended(int cause) {
    mGoogleApiClient.connect();
}

    }

Answer 1

I see in their documentation where they clearly instruct you to include this import:

import com.google.android.gms.common.GooglePlayServicesClient.ConnectionCallbacks;

However, the error being thrown is expecting a different class than GooglePlayServicesClient.ConnectionCallbacks, it's asking for GoogleApiClient.ConnectionCallbacks. Try changing your implements to use the more-qualified class name. That looks to be the only possible thing throwing the code for a loop and without the explicit qualified classname, it will default to the directly imported class name.

It's always tougher when you have to question the manual.

Edit: I mean a change like this:

public class MainActivity 
    extends ActionBarActivity 
    implements GoogleApiClient.ConnectionCallbacks,
               GoogleApiClient.OnConnectionFailedListener {