连接到GoogleApiClient后未调用GoogleApiClient.ConnectionCallbacks方法

Question

我有一些代码连接到GoogleApiClient但是没有调用onConnected.

public class MainActivity extends Activity implements  GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {
    private GoogleApiClient mApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initGoogleApiClient();
    }

    private void initGoogleApiClient() {
        mApiClient = new GoogleApiClient.Builder( this )
                .addApi( Wearable.API )
                .build();
        mApiClient.connect(); // On completion onConnected() will be called
    }
    @Override
    public void onConnected(Bundle bundle) {
    }

    @Override
    public void onConnectionSuspended(int i) {
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mApiClient.disconnect();
    }

    @Override
    public void onConnectionFailed(com.google.android.gms.common.ConnectionResult connectionResult) {
    }

四个@Override方法都没有被调用,为什么会这样？

Answer 1

你需要调用addConnectionCallbacks()和addOnConnectionFailedListener()在你的GoogleApiClient.Builder:

mApiClient = new GoogleApiClient.Builder( this )
    .addApi( Wearable.API )
    .addConnectionCallbacks(this)
    .addOnConnectionFailedListener(this)
    .build();