mGoogleApiClient.isConnected() returns 空

Question

我已完成所有 Whosebug 问题并尝试了所有方法，但问题仍然存在。

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

private static final String LOG_TAG = "PlaceInfoActivity";
private static final int GOOGLE_API_CLIENT_ID = 0;
private GoogleApiClient mGoogleApiClient;
TextView mTextView;
String content = "";

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

    mTextView = (TextView) findViewById(R.id.textView0);

    mGoogleApiClient = new GoogleApiClient
            .Builder(this)
            .enableAutoManage(this, 0, this)
            .addApi(Places.PLACE_DETECTION_API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();

    Toast.makeText(this, Boolean.toString(mGoogleApiClient.isConnected()), Toast.LENGTH_SHORT).show();


    if (mGoogleApiClient.isConnected()) {

        PendingResult<PlaceLikelihoodBuffer> result = Places.PlaceDetectionApi.getCurrentPlace(mGoogleApiClient, null);
        result.setResultCallback(new ResultCallback<PlaceLikelihoodBuffer>() {
            @Override
            public void onResult(PlaceLikelihoodBuffer likelyPlaces) {
                PlaceLikelihood placeLikelihood = likelyPlaces.get(0);

                if (placeLikelihood != null && placeLikelihood.getPlace() != null && !TextUtils.isEmpty(placeLikelihood.getPlace().getName()))
                    content = "Most likely place: " + placeLikelihood.getPlace().getName() + "\n";
                if (placeLikelihood != null)
                    content += "Percent change of being there: " + (int) (placeLikelihood.getLikelihood() * 100) + "%";
                mTextView.setText(content);

                likelyPlaces.release();
            }
        });
    }
}

@Override
protected void onStart() {
    super.onStart();
    if (mGoogleApiClient != null)
        mGoogleApiClient.connect();
}

@Override
protected void onResume() {
    super.onResume();

    mGoogleApiClient.connect();
}

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

@Override
public void onConnectionFailed(ConnectionResult connectionResult) {

}

@Override
public void onConnected(Bundle bundle) {

}

@Override
public void onConnectionSuspended(int i) {

} }

构建后，当我打印 toast 时，它每次都给出 false，可能是什么错误？我正在学习本教程并想检索我当前位置的名称。 http://code.tutsplus.com/articles/google-play-services-using-the-places-api--cms-23715

Answer 1

它总是错误的，因为你调用 connect() onStart。声明一个方法

public void showPlaces() {
      PendingResult<PlaceLikelihoodBuffer> result = Places.PlaceDetectionApi.getCurrentPlace(mGoogleApiClient, null);
        result.setResultCallback(new ResultCallback<PlaceLikelihoodBuffer>() {
            @Override
            public void onResult(PlaceLikelihoodBuffer likelyPlaces) {
                PlaceLikelihood placeLikelihood = likelyPlaces.get(0);

                if (placeLikelihood != null && placeLikelihood.getPlace() != null && !TextUtils.isEmpty(placeLikelihood.getPlace().getName()))
                    content = "Most likely place: " + placeLikelihood.getPlace().getName() + "\n";
                if (placeLikelihood != null)
                    content += "Percent change of being there: " + (int) (placeLikelihood.getLikelihood() * 100) + "%";
                mTextView.setText(content);

                likelyPlaces.release();
            }
        });
}

并调用它，当 onConnected 被调用时

@Override
public void onConnected(Bundle bundle) {
  showPlaces();
}

Answer 2

问题出在 mGoogleApiClient.isConnected() 上，它给你错误，这就是它无法执行进一步工作的原因。如果您只是删除 if(mGoogleApiClient.isConnected()) 部分，它将起作用。

这样做：

    public void showPlaces() {

    PendingResult<PlaceLikelihoodBuffer> result = Places.PlaceDetectionApi.getCurrentPlace(mGoogleApiClient, null);
    result.setResultCallback(new ResultCallback<PlaceLikelihoodBuffer>() {
        @Override
        public void onResult(PlaceLikelihoodBuffer likelyPlaces) {
            StringBuffer sb=new StringBuffer();
            for (PlaceLikelihood placeLikelihood : likelyPlaces) {
                String name, per;
                name = placeLikelihood.getPlace().getName().toString()+"      ";
                per = ""+(int) (placeLikelihood.getLikelihood() * 100)+"\n";
                sb.append(name+per);
            }
            content = sb.toString();
            mTextView.setText(content);
            likelyPlaces.release();
        }
    });
}

并在 mGoogleApiClient....build() 之后调用 showPlaces 方法；

mGoogleApiClient = new GoogleApiClient
            .Builder(this)
            .enableAutoManage(this, 0, this)
            .addApi(Places.PLACE_DETECTION_API)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .build();

showPlaces();

mGoogleApiClient.isConnected() returns 空

mGoogleApiClient.isConnected() returns null

android

google-api-client

google-play-services