Java getLastLocation返回一个空值

我遵循了这本指南，但我无法收到最后一个位置

我只需要一次位置信息

这是我的代码：

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

    public static final String TAG = MainActivity.class.getSimpleName();
    public static final String DAILY_FORECAST = "DAILY_FORECAST";
    public static final String HOURLY_FORECAST = "HOURLY_FORECAST";

    private Forecast mForecast;
    private GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private double mLatitude;
    private double mLongitude;

    @Bind(R.id.timeLabel) TextView mTimeLabel;
    @Bind(R.id.temperatureLabel) TextView mTemperatureLabel;
    @Bind(R.id.humidityValue) TextView mHumidityValue;
    @Bind(R.id.precipValue) TextView mPrecipValue;
    @Bind(R.id.summaryLabel) TextView mSummaryLabel;
    @Bind(R.id.iconImageView) ImageView mIconImageView;
    @Bind(R.id.refreshImageView) ImageView mRefreshImageView;
    @Bind(R.id.progressBar) ProgressBar mProgressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        mProgressBar.setVisibility(View.INVISIBLE);

        buildGoogleApiClient();

        //mLatitude = 37.8267;
        //mLongitude = -122.423;


        mRefreshImageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getForecast(mLatitude, mLongitude);
            }
        });

        getForecast(mLatitude, mLongitude);
    }

    private void getForecast(double latitude, double longitude) {
        String apiKey = "48fb6c0ca3567d0b17bf99b400ef5606";
        String forecastUrl = "https://api.forecast.io/forecast/" + apiKey +
                "/" + latitude + "," + longitude;
        if (isNetworkAvailable()) {
            toggleRefresh();

            OkHttpClient client = new OkHttpClient();
            Request request = new Request.Builder()
                    .url(forecastUrl)
                    .build();

            Call call = client.newCall(request);
            call.enqueue(new Callback() {
                @Override
                public void onFailure(Request request, IOException e) {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            toggleRefresh();
                        }
                    });
                    alertUserAboutError();
                }

                @Override
                public void onResponse(Response response) throws IOException {
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            toggleRefresh();
                        }
                    });

                    try {
                        String jsonData = response.body().string();
                        Log.v(TAG, jsonData);
                        if (response.isSuccessful()) {
                            mForecast = parseForecastDetails(jsonData);
                            runOnUiThread(new Runnable() {
                                @Override
                                public void run() {
                                    updateDisplay();
                                }
                            });
                        } else {
                            alertUserAboutError();
                        }
                    } catch (IOException e) {
                        Log.e(TAG, "Exception caught: ", e);
                    } catch (JSONException e) {
                        Log.e(TAG, "Exception caught: ", e);
                    }
                }
            });
        }
        else {
            Toast.makeText(this, getString(R.string.network_unavailable_message),
                    Toast.LENGTH_LONG).show();
        }
    }

    private void toggleRefresh() {
        if (mProgressBar.getVisibility() == View.INVISIBLE) {
            mProgressBar.setVisibility(View.VISIBLE);
            mRefreshImageView.setVisibility(View.INVISIBLE);
        }
        else {
            mProgressBar.setVisibility(View.INVISIBLE);
            mRefreshImageView.setVisibility(View.VISIBLE);
        }
    }

    private void updateDisplay() {
        Current current = mForecast.getCurrent();

        mTemperatureLabel.setText(current.getTemperature() + "");
        mTimeLabel.setText("At " + current.getFormattedTime() + " it will be");
        mHumidityValue.setText(current.getHumidity() + "");
        mPrecipValue.setText(current.getPrecipChance() + "%");
        mSummaryLabel.setText(current.getSummary());

        Drawable drawable = getResources().getDrawable(current.getIconId());
        mIconImageView.setImageDrawable(drawable);
    }

    private Forecast parseForecastDetails(String jsonData) throws JSONException {
        Forecast forecast = new Forecast();

        forecast.setCurrent(getCurrentDetails(jsonData));
        forecast.setHourlyForecast(getHourlyForecast(jsonData));
        forecast.setDailyForecast(getDailyForecast(jsonData));

        return forecast;
    }

    private Day[] getDailyForecast(String jsonData) throws JSONException {JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        JSONObject daily = forecast.getJSONObject("daily");
        JSONArray data = daily.getJSONArray("data");

        Day[] days = new Day[data.length()];
        for (int i = 0; i < data.length(); i++) {
            JSONObject jsonDay = data.getJSONObject(i);
            Day day = new Day();

            day.setSummary(jsonDay.getString("summary"));
            day.setIcon(jsonDay.getString("icon"));
            day.setTime(jsonDay.getLong("time"));
            day.setTemperatureMax(jsonDay.getDouble("temperatureMax"));
            day.setTimezone(timezone);

            days[i] = day;
        }

        return days;
    }

    private Hour[] getHourlyForecast(String jsonData) throws JSONException {
        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");
        JSONObject hourly = forecast.getJSONObject("hourly");
        JSONArray data = hourly.getJSONArray("data");

        Hour[] hours = new Hour[data.length()];
        for (int i = 0; i < data.length(); i++) {
            JSONObject jsonHour = data.getJSONObject(i);
            Hour hour = new Hour();

            hour.setSummary(jsonHour.getString("summary"));
            hour.setTemperature(jsonHour.getDouble("temperature"));
            hour.setIcon(jsonHour.getString("icon"));
            hour.setTime(jsonHour.getLong("time"));
            hour.setTimezone(timezone);

            hours[i] = hour;
        }

        return hours;
    }

    private Current getCurrentDetails(String jsonData) throws JSONException {
        JSONObject forecast = new JSONObject(jsonData);
        String timezone = forecast.getString("timezone");

        Log.i(TAG, "From JSON: " + timezone);

        JSONObject currently = forecast.getJSONObject("currently");

        Current current = new Current();
        current.setHumidity(currently.getDouble("humidity"));
        current.setTime(currently.getInt("time"));
        current.setSummary(currently.getString("summary"));
        current.setTemperature(currently.getInt("temperature"));
        current.setIcon(currently.getString("icon"));
        current.setPrecipChance(currently.getDouble("precipProbability"));
        current.setTimeZone(timezone);

        Log.d(TAG, current.getFormattedTime());

        return current;
    }

    private boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager)
                getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        boolean isAvailable = false;
        if (networkInfo != null && networkInfo.isConnected()) {
            isAvailable = true;
        }
        return isAvailable;
    }

    private void alertUserAboutError() {
        AlertDialogFragment dialog = new AlertDialogFragment();
        dialog.show(getFragmentManager(), "error_dialog");
    }

    @OnClick (R.id.dailyButton)
    public void startDailyActivity(View view) {
        Intent intent = new Intent(this, DailyForecastActivity.class);
        intent.putExtra(DAILY_FORECAST, mForecast.getDailyForecast());
        startActivity(intent);
    }

    @OnClick(R.id.hourlyButton)
    public void startHourlyActivity(View view) {
        Intent intent = new Intent(this, HourlyForecastActivity.class);
        intent.putExtra(HOURLY_FORECAST, mForecast.getHourlyForecast());
        startActivity(intent);
    }

    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    @Override
    public void onConnected(Bundle bundle) {
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

        if (mLastLocation != null) {
            mLatitude = mLastLocation.getLatitude();
            mLongitude = mLastLocation.getLongitude();
        }
    }

    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {

    }
}

公共类MainActivity扩展了ActionBarActivity实现了GoogleAppClient.ConnectionCallbacks，
GoogleAppClient.OnConnectionFailedListener{
公共静态最终字符串标记=MainActivity.class.getSimpleName（）；
公共静态最终字符串DAILY\u FORECAST=“DAILY\u FORECAST”；
公共静态最终字符串HOURLY\u FORECAST=“HOURLY\u FORECAST”；
私人预测；
私人GoogleapClient MGoogleapClient；
私人场所；
私人双重国籍；
私人双重身份；
@绑定（R.id.timeLabel）文本视图MTIMELABLE；
@绑定（R.id.temperatureLabel）文本视图MTTemperatureLabel；
@绑定（R.id.humidityValue）文本视图mHumidityValue；
@绑定（R.id.precipValue）文本视图值；
@绑定（R.id.summaryLabel）文本视图MSSummaryLabel；
@绑定（R.id.iconImageView）图像视图mIconImageView；
@绑定（R.id.refreshImageView）ImageView mRefreshImageView；
@绑定（R.id.progressBar）progressBar-mProgressBar；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_main）；
把（这个）绑起来；
mProgressBar.setVisibility（视图.不可见）；
buildGoogleAppClient（）；
//mLatitude=37.8267；
//长度=-122.423；
mRefreshImageView.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
getForecast（高度、长度）；
}
});
getForecast（高度、长度）；
}
私人预测（双纬度、双经度）{
字符串apiKey=“48fb6c0ca3567d0b17bf99b400ef5606”；
字符串预测URL=”https://api.forecast.io/forecast/“+apiKey+
“/”+纬度+”，“+经度；
if（isNetworkAvailable（））{
切换刷新（）；
OkHttpClient=新的OkHttpClient（）；
Request Request=newrequest.Builder（）
.url（预测url）
.build（）；
Call Call=client.newCall（请求）；
call.enqueue（新回调（）{
@凌驾
公共void onFailure（请求，IOE异常）{
runOnUiThread（新的Runnable（）{
@凌驾
公开募捐{
切换刷新（）；
}
});
alertUserAboutError（）；
}
@凌驾
public void onResponse（Response-Response）引发IOException{
runOnUiThread（新的Runnable（）{
@凌驾
公开募捐{
切换刷新（）；
}
});
试一试{
String jsonData=response.body（）.String（）；
Log.v（标签，jsonData）；
if（response.issusccessful（））{
mForecast=parseForecastDetails（jsonData）；
runOnUiThread（新的Runnable（）{
@凌驾
公开募捐{
updateDisplay（）；
}
});
}否则{
alertUserAboutError（）；
}
}捕获（IOE异常）{
Log.e（标记“异常捕获：”，e）；
}捕获（JSONException e）{
Log.e（标记“异常捕获：”，e）；
}
}
});
}
否则{
Toast.makeText（此，getString（R.string.network\u不可用\u消息），
Toast.LENGTH_LONG）.show（）；
}
}
私有void toggleRefresh（）{
if（mProgressBar.getVisibility（）==View.INVISIBLE）{
mProgressBar.setVisibility（View.VISIBLE）；
mRefreshImageView.setVisibility（View.INVISIBLE）；
}
否则{
mProgressBar.setVisibility（视图.不可见）；
mRefreshImageView.setVisibility（View.VISIBLE）；
}
}
私有void updateDisplay（）{
Current-Current=mForecast.getCurrent（）；
mTemperatureLabel.setText（current.getTemperature（）+）；
mtimelab.setText（“在”+current.getFormattedTime（）+“它将是”）；
mHumidityValue.setText（current.get湿度（）+）；
mPrecipValue.setText（当前.getPrecipChance（）+“%”）；
msummarylab.setText（current.getSummary（））；
Drawable Drawable=getResources（）.getDrawable（current.getIconId（））；
mIconImageView.setImageDrawable（可绘制）；
}
私有预测parseForecastDetails（字符串jsonData）抛出JSONException{
预测=新预测（）；
setCurrent（getCurrentDetails（jsonData））；
forecast.setHourlyForecast（getHourlyForecast（jsonData））；
setDailyForecast（getDailyForecast（jsonData））；
收益预测；
}
私人日[]getDailyForecast（字符串jsonData）抛出JSONException{JSONObject forecast=新JSONObject（jsonData）；
String timezone=forecast.getString（“时区”）；
JSONObject daily=forecast.getJSONObject（“daily”）；
JSONArray data=daily.getJSONArray（“数据”）；
Day[]days=新的一天[data.length（）]；
对于（int i=0；i buildGoogleApiClient();
 mGoogleApiClient.connect(); //added

public class MainActivity extends Activity implements
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener, LocationListener {

    LocationRequest mLocationRequest;
    GoogleApiClient mGoogleApiClient;
    private Location mLastLocation;
    private double mLatitude;
    private double mLongitude;

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

        buildGoogleApiClient();
        mGoogleApiClient.connect();
    }

    @Override
    protected void onPause(){
        super.onPause();
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }

    protected synchronized void buildGoogleApiClient() {

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

    @Override
    public void onConnected(Bundle bundle) {

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000);
        mLocationRequest.setFastestInterval(1000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

        //mLocationRequest.setSmallestDisplacement(0.1F);

        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    }

    @Override
    public void onConnectionSuspended(int i) {
        Toast.makeText(this,"onConnectionSuspended",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Toast.makeText(this,"onConnectionFailed",Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onLocationChanged(Location location) {
        mLastLocation = location;
        //no need to do a null check here:
        mLatitude = location.getLatitude();
        mLongitude = location.getLongitude();

        //remove location updates if you just need one location:
        if (mGoogleApiClient != null) {
            LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
        }
    }
}