android 地理定位在模拟器和手机中不起作用

Question

在我的应用程序中，位置更新不起作用，当我单击开始位置更新按钮时应用程序关闭。我是初学者，我不知道如何调试这个 error.What 我想从我的应用程序中得到

应用程序必须每分钟更新一次位置
该应用程序将在后台运行，当我们关闭音乐播放器等应用程序时它会关闭

Main_activity.class

package com.example.admin.locationapidemo;
import android.app.Activity;
import android.location.Location;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import java.sql.Connection;
public class MainActivity extends Activity implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener, LocationListener{

 - List item

private static final String TAG = MainActivity.class.getSimpleName();
    private final static int PLAY_SERVICES_RESOLUTION_REQUEST = 1000;

    private Location mLastLocation;
    private GoogleApiClient mGoogleApiClient;

    private boolean mRequestLocationUpdates = false;

    private LocationRequest mLocationRequest;

    private static int UPDATE_INTERVAL = 10000;
    private static int FATEST_INTERVAL = 5000;
    private static int DISPLACEMENT = 10;

    private TextView lblLocation;
    private Button btnShowLocation, btnStartLocationUpdates;

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

        lblLocation = (TextView) findViewById(R.id.lblLocation);
        btnShowLocation = (Button) findViewById(R.id.buttonShowLocation);
        btnStartLocationUpdates = (Button) findViewById(R.id.buttonLocationUpdates);

        if(checkPlayServices()) {
            buildGoogleApiClient();
            createLocationRequest();
        }

        btnShowLocation.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                displayLocation();
            }
        });

        btnStartLocationUpdates.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                togglePeriodLocationUpdates();
            }
        });
    }

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

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

        checkPlayServices();
        if(mGoogleApiClient.isConnected() && mRequestLocationUpdates) {
            startLocationUpdates();
        }
    }


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

        if(mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        stopLocationUpdates();
    }

    private void displayLocation() {
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if(mLastLocation != null) {
            double latitude = mLastLocation.getLatitude();
            double longtitude = mLastLocation.getLongitude();

            lblLocation.setText(latitude + ", " + longtitude);
        } else {
            lblLocation.setText("Couldn't get the location. Make sure location is enabled on the device");
        }
    }

    private void togglePeriodLocationUpdates() {
        if(!mRequestLocationUpdates) {
            btnStartLocationUpdates.setText(getString(R.string.btn_stop_location_updates));

            mRequestLocationUpdates = true;

            startLocationUpdates();
        } else {
            btnStartLocationUpdates.setText(getString(R.string.btn_start_location_updates));

            mRequestLocationUpdates = false;

            stopLocationUpdates();
        }
    }

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

    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(UPDATE_INTERVAL);
        mLocationRequest.setFastestInterval(FATEST_INTERVAL);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setSmallestDisplacement(DISPLACEMENT);
    }

    private boolean checkPlayServices() {
        int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if(resultCode != ConnectionResult.SUCCESS) {
            if(GooglePlayServicesUtil.isUserRecoverableError(resultCode)) {
                GooglePlayServicesUtil.getErrorDialog(resultCode, this, PLAY_SERVICES_RESOLUTION_REQUEST).show();
            } else {
                Toast.makeText(getApplicationContext(), "This device is not supported", Toast.LENGTH_LONG)
                        .show();
                finish();
            }
            return false;
        }
        return true;
    }

    protected void startLocationUpdates() {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    }

    protected void stopLocationUpdates() {
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
    }

    @Override
    public void onConnected(Bundle bundle) {
        displayLocation();

        if(mRequestLocationUpdates) {
            startLocationUpdates();
        }
    }

    @Override
    public void onConnectionSuspended(int i) {
        mGoogleApiClient.connect();
    }

    @Override
    public void onLocationChanged(Location location) {
        mLastLocation = location;

        Toast.makeText(getApplicationContext(), "Location changed!", Toast.LENGTH_SHORT).show();

        displayLocation();
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.i(TAG, "Connection failed: " + connectionResult.getErrorCode());
    }
}

我的 xml 文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    android:orientation="vertical"
    android:gravity="center_horizontal"
    android:background="@color/view_bg">

    <TextView
        android:text="@string/lbl_you_are_at"
        android:layout_marginTop="25dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/white"
        android:textSize="25dp"
        android:textStyle="bold"/>

    <TextView
        android:id="@+id/lblLocation"
        android:padding="15dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="@color/white"
        android:textSize="16dp" />

    <Button
        android:id="@+id/buttonShowLocation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="40dp"
        android:background="@color/btn_bg"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:text="@string/btn_get_location"
        android:textColor="@color/view_bg"/>

    <Button
        android:id="@+id/buttonLocationUpdates"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="60dp"
        android:background="@color/btn_bg"
        android:paddingLeft="20dp"
        android:paddingRight="20dp"
        android:text="@string/btn_start_location_updates"
        android:textColor="@color/view_bg"/>




</LinearLayout>

清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.admin.locationapidemo">

    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <meta-data
                android:name="com.google.android.gms.version"
                android:value="@integer/google_play_services_version" />

            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service
            android:name=".MyService"
            android:enabled="true"
            android:exported="true"></service>
    </application>

</manifest>

Answer 1

private void displayLocation() {
        mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        if(mLastLocation != null) {
            double latitude = mLastLocation.getLatitude();
            double longtitude = mLastLocation.getLongitude();

            lblLocation.setText(latitude + ", " + longtitude);
        } else {
            lblLocation.setText("Couldn't get the location. Make sure location is enabled on the device");
        }
    }

删除这一行

mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);

因为在 onLocationChanged() 中您正在为 mLastLocation 赋值，所以请尝试使用该赋值。

Answer 2

请使用以下服务进行位置更新：-

   package com.example.serverpro.recycleviewquestion;

import android.annotation.SuppressLint;
import android.app.Service;
import android.content.Intent;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;
import android.widget.Toast;

import java.util.TimerTask;

/**
 * Created by serverpro on 8/12/17.
 */

public class GPSTracker extends Service implements LocationListener {


    // flag for GPS status
    boolean isGPSEnabled = false;

    // flag for network status
    boolean isNetworkEnabled = false;

    // flag for GPS status
    boolean canGetLocation = false;

    Location location; // location
    double latitude; // latitude
    double longitude; // longitude

    // The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000; // 1 minute

    // Declaring a Location Manager
    protected LocationManager locationManager;

    private TimerTask timerTask;



    @SuppressLint("MissingPermission")
    public Location getLocation() {
        try {
            locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);

            // getting GPS status
            isGPSEnabled = locationManager
                    .isProviderEnabled(LocationManager.GPS_PROVIDER);

            // getting network status
            isNetworkEnabled = locationManager
                    .isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if (!isGPSEnabled && !isNetworkEnabled) {
                // no network provider is enabled
            } else {
                this.canGetLocation = true;
                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(
                            LocationManager.NETWORK_PROVIDER,
                            MIN_TIME_BW_UPDATES,
                            MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                    Log.d("Network", "Network");
                    if (locationManager != null) {
                        location = locationManager
                                .getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                            Toast.makeText(this, "+"+latitude, Toast.LENGTH_SHORT).show();
                        }
                    }
                }
                // if GPS Enabled get lat/long using GPS Services
                if (isGPSEnabled) {
                    if (location == null) {
                        locationManager.requestLocationUpdates(
                                LocationManager.GPS_PROVIDER,
                                MIN_TIME_BW_UPDATES,
                                MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
                        Log.d("GPS Enabled", "GPS Enabled");
                        if (locationManager != null) {
                            location = locationManager
                                    .getLastKnownLocation(LocationManager.GPS_PROVIDER);
                            if (location != null) {
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();

                                Toast.makeText(this, "+"+latitude, Toast.LENGTH_SHORT).show();
                            }
                        }
                    }
                }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }

        return location;
    }

    /**
     * Stop using GPS listener
     * Calling this function will stop using GPS in your app
     * */
    public void stopUsingGPS(){
        if(locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }
    }

    /**
     * Function to get latitude
     * */
    public double getLatitude(){
        if(location != null){
            latitude = location.getLatitude();
        }

        // return latitude
        return latitude;
    }

    /**
     * Function to get longitude
     * */
    public double getLongitude(){
        if(location != null){
            longitude = location.getLongitude();
        }

        // return longitude
        return longitude;
    }

    /**
     * Function to check GPS/wifi enabled
     * @return boolean
     * */
    public boolean canGetLocation() {
        return this.canGetLocation;
    }

    /**
     * Function to show settings alert dialog
     * On pressing Settings button will lauch Settings Options
     * */

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

    @Override
    public void onProviderDisabled(String provider) {
    }

    @Override
    public void onProviderEnabled(String provider) {
    }

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {


        getLocation();
        return START_STICKY;
    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
}

同时提供以下权限：-

<uses-permission 
    android:name="android.permission.INTERNET"/>
<uses-permission 
    android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission 
    android:name="android.permission.ACCESS_FINE_LOCATION"/>

也在Android Manifest

中声明此服务

根据您的需要在 GPS Tracker 中更改这两个参数：

// The minimum distance to change Updates in meters
    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters

    // The minimum time between updates in milliseconds
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute

并且必须打开 GPS 才能进行位置更新

android 地理定位在模拟器和手机中不起作用

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