为什么在Android Google+；认证？

下面是我对G+身份验证样板文件的实现。当按下按钮时，子类调用resolveSignInErrors（），但是实现无法工作。问题是当调用resolveSignInErrors（）时，mConnectionResult为null，因此不会发生任何事情

我希望在onConnectionFailed（）中设置mConnectionResult，但是没有调用它，尽管调用了GoogleAppClient.connect（）。为什么不调用onConnectionFailed（）呢

我觉得这个API完全令人困惑

public class GooglePlusActivity extends MyActivity implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    private GoogleApiClient mGoogleApiClient;
    private ConnectionResult mConnectionResult;
    boolean mIntentInProgress = false;
    final int RC_SIGN_IN = 0;
    protected boolean mSignInClicked;

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

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

    @Override
    protected void onStop() {
        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
        super.onStop();
    }

    protected GoogleApiClient getGoogleApiClient() {
        return mGoogleApiClient;
    }

    protected void initialiseGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(Plus.API)
                .addScope(Plus.SCOPE_PLUS_LOGIN)
                .addScope(Plus.SCOPE_PLUS_PROFILE)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
    }

    @Override
    public void onConnected(Bundle connectionHint) {
        mSignInClicked = false;
    }

    @Override
    public void onConnectionSuspended(int i) {
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        if (!mIntentInProgress) {
            mConnectionResult = connectionResult;
            if (mSignInClicked) {
                resolveSignInError();
            }
        }
    }

    protected void resolveSignInError() {
        Toast.makeText(this, "resolveSignInError", Toast.LENGTH_SHORT).show();
        if (mConnectionResult!=null && mConnectionResult.hasResolution()) {
            Toast.makeText(this, "inside if", Toast.LENGTH_SHORT).show();
            try {
                Toast.makeText(this, "inside try", Toast.LENGTH_SHORT).show();
                mIntentInProgress = true;
                mConnectionResult.startResolutionForResult(this, RC_SIGN_IN);
            } catch (IntentSender.SendIntentException e) {
                mIntentInProgress = false;
                getGoogleApiClient().connect();
            }
        }

    }

    protected void onActivityResult(int requestCode, int responseCode, Intent intent) {
        if (requestCode == RC_SIGN_IN) {
            if (responseCode != RESULT_OK) {
                mSignInClicked = false;
            }
            mIntentInProgress = false;
            if (!getGoogleApiClient().isConnecting()) {
                getGoogleApiClient().connect();
            }
        }
    }

}

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我看不出为什么它不能用给定的代码得到调用，你确定这不是MinentInProgress no设置正确吗？还是只是连接正确？在您批准应用程序一次后，后续调用应成功，直到用户取消对应用程序的授权。