Question

我被告知要按照https://developer.android.com/training/location/retrieve-current.html

上的教程进行操作

当我这样做时，我没有获得地理位置，出于沮丧，我下载了预制程序，但也没有工作。它告诉我＆＃34;没有检测到位置。确保在设备上启用了位置。＆＃34;仅在位置为空时才说明。

  /**
 * Copyright 2014 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.android.gms.location.sample.basiclocationsample;

import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationServices;

/**
 * Location sample.
 *
 * Demonstrates use of the Location API to retrieve the last known location for a device.
 * This sample uses Google Play services (GoogleApiClient) but does not need to authenticate a user.
 * See https://github.com/googlesamples/android-google-accounts/tree/master/QuickStart if you are
 * also using APIs that need authentication.
 */
public class MainActivity extends AppCompatActivity implements
        ConnectionCallbacks, OnConnectionFailedListener {

    protected static final String TAG = "MainActivity";

    /**
     * Provides the entry point to Google Play services.
     */
    protected GoogleApiClient mGoogleApiClient;

    /**
     * Represents a geographical location.
     */
    protected Location mLastLocation;

    protected String mLatitudeLabel;
    protected String mLongitudeLabel;
    protected TextView mLatitudeText;
    protected TextView mLongitudeText;



    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_activity);

        mLatitudeLabel = getResources().getString(R.string.latitude_label);
        mLongitudeLabel = getResources().getString(R.string.longitude_label);
        mLatitudeText = (TextView) findViewById((R.id.latitude_text));
        mLongitudeText = (TextView) findViewById((R.id.longitude_text));

        buildGoogleApiClient();
    }

    /**
     * Builds a GoogleApiClient. Uses the addApi() method to request the LocationServices API.
     */
    protected synchronized void buildGoogleApiClient() {
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
    }

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

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

    /**
     * Runs when a GoogleApiClient object successfully connects.
     */
    @Override
    public void onConnected(Bundle connectionHint) {
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if (mLastLocation != null) {
            mLatitudeText.setText(String.format("%s: %f", mLatitudeLabel,
                    mLastLocation.getLatitude()));
            mLongitudeText.setText(String.format("%s: %f", mLongitudeLabel,
                    mLastLocation.getLongitude()));
        } else {
            Toast.makeText(this, R.string.no_location_detected, Toast.LENGTH_LONG).show();
        }
    }

    @Override
    public void onConnectionFailed(ConnectionResult result) {
        // Refer to the javadoc for ConnectionResult to see what error codes might be returned in
        // onConnectionFailed.
        Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + result.getErrorCode());
    }


    @Override
    public void onConnectionSuspended(int cause) {
        // The connection to Google Play services was lost for some reason. We call connect() to
        // attempt to re-establish the connection.
        Log.i(TAG, "Connection suspended");
        mGoogleApiClient.connect();
    }
}

老实说，我不知道为什么它拒绝给我GPS更新，有人能帮助我吗？我检查了仿真手机设置，它确实允许应用程序使用GPS数据。谢谢

Answer 1

可能无法使用模拟器提供地理位置，只需尝试使用手机，或者找到以下链接即可在模拟器中获取地理位置。How to emulate GPS location in the Android Emulator?

Answer 2

尝试使用LocationManager代替以固定间隔和距离

获取位置

    LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    int interval = 1000; // one second
    int distance = 0; // 0 means ignore triggering based on distance
   try {
        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, interval, distance, this);
    } catch (SecurityException ignored) {}

您的Activity类必须扩展LocationListener，以实现以下方法

@Override
public void onLocationChanged(Location location) {
       double latitude = location.getLatitude();
       double longitude = location.getLongitude();
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {

}

@Override
public void onProviderEnabled(String provider) {

}

@Override
public void onProviderDisabled(String provider) {

}

Answer 3

好吧，所以主要的问题是，因为这只调用一次GPS定位，并且启动，这意味着可能没有GPS数据存在，这可以通过使它不断要求更新，如果GPS数据= null。该教程从未解释过，并且我发布它以防万一其他人有问题。

Google API没有获得Geo-Locatiion

3 个答案: