地图应用无法正常工作，地图无法在设备上加载

Question

我开发了一个Android地图应用程序（我使用的是Android Studio）。我在模拟器上测试过它工作正常，但是当我在设备上测试时，地图没有加载。只是显示空白的瓷砖。这是我的代码：

Android Manifest

    <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.exemple.impas" >
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <!--
 The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
         Google Maps Android API v2, but are recommended.
    -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="@string/google_maps_key" />
        <activity
            android:name=".MapsActivity"
            android:label="@string/title_activity_maps" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

布局

<?xml version="1.<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

<fragment
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/map"
    tools:context=".MapsActivity"
    android:name="com.google.android.gms.maps.MapFragment"
    android:layout_above="@+id/btlocaliza" />

<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Gerar Localização"
android:id="@+id/btlocaliza"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true" />

</RelativeLayout>

MapsActivity

package com.exemple.impas;

import android.graphics.Color;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.app.Activity;
import android.content.Context;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.maps.model.Polyline;
import com.google.android.gms.maps.model.PolylineOptions;

import java.util.List;

public class MapsActivity extends Activity {

    private GoogleMap mMap; // Might be null if Google Play services APK is not available.
    private Polyline polyline;
    private List<LatLng> list;
    GPSTracker gps;

    private Button btlocaliza;

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

        btlocaliza = (Button) findViewById(R.id.btlocaliza);
        btlocaliza.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                gps = new GPSTracker(MapsActivity.this);

                if (gps.canGetLocation) {
                    double latitude = gps.getLatitude();
                    double longitude = gps.getLongitude();

                    CreateMapView();
                    addMarker();
                    LatLng position = new LatLng(latitude, longitude);
                    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(position,15));
                    Toast.makeText(getApplicationContext(), "Your location is -\nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
                } else {
                    gps.showSetting();
                }
            }
        });
    }

    private void CreateMapView() {
        try {
            if (mMap == null) {
                mMap = ((MapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
                if (mMap == null) {
                    Toast.makeText(getApplicationContext(), "Error creating map", Toast.LENGTH_SHORT).show();
                }
            }
        } catch (NullPointerException exception) {
            Log.e("mapApp", exception.toString());
        }
    }

    private void addMarker() {
        if (mMap != null){
            gps = new GPSTracker(MapsActivity.this);
            double latitude = gps.getLatitude();
            double longitude = gps.getLongitude();
            mMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude)).title("You are here!").draggable(true));
        }else{
            Toast.makeText(getApplicationContext(), "Error creating marker", Toast.LENGTH_SHORT).show();
        }
    }

GPSTracker

package com.exemple.impas;

import android.app.AlertDialog;
import android.app.Service;
import android.content.Context;
import android.content.DialogInterface;
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.provider.Settings;

public class GPSTracker extends Service implements LocationListener {

    private final Context context;

    Location location;

    boolean isGPSEnabled = false;
    boolean isNetworkEnabled = false;
    boolean canGetLocation = false;

    double latitude;
    double longitude;

    private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10;
    private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1;

    protected LocationManager locationManager;

    public GPSTracker(Context context){
        this.context = context;
        getLocation();
    }

    public Location getLocation(){
        try{
            locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);

            isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
            isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

            if(!isGPSEnabled && !isNetworkEnabled){

            }
            else {
                this.canGetLocation = true;

                if (isNetworkEnabled) {
                    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                    if (locationManager != null) {
                        location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

                        if (location != null) {
                            latitude = location.getLatitude();
                            longitude = location.getLongitude();
                        }
                    }
                }

                if (isGPSEnabled){
                    if (location == null){
                        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,MIN_TIME_BW_UPDATES,MIN_DISTANCE_CHANGE_FOR_UPDATES, this);

                        if (locationManager != null) {
                            location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);

                            if (location!= null){
                                latitude = location.getLatitude();
                                longitude = location.getLongitude();
                            }
                        }
                    }
                }
            }

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

        return location;
     }

    public void stopUsingGPS(){
        if (locationManager != null){
            locationManager.removeUpdates(GPSTracker.this);
        }
    }

    public double getLatitude(){
        if (location != null){
            latitude = location.getLatitude();
        }
        return latitude;
    }

    public double getLongitude(){
        if (location != null){
            longitude = location.getLongitude();
        }
        return longitude;
    }

    public boolean isCanGetLocation(){
        return this.canGetLocation;
    }

    public void showSetting(){
        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);

        alertDialog.setTitle("GPS is setting");
        alertDialog.setMessage("GPS is not enabled!");

        alertDialog.setPositiveButton("OK", new DialogInterface.OnClickListener(){
            @Override
            public void onClick(DialogInterface dialog, int witch){
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                //context.startActivities(intent);
            }
        });

        alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int witch) {
                dialog.cancel();
            }
        });
        alertDialog.show();
    }

有人可以帮帮我吗？谢谢温迪

Answer 1

看起来您的API密钥可能不正确。请在您加载地图时发布1.您的strings.xml文件和2. LogCat输出，日志级别错误。

初步解决方案，如果它确实是API密钥：（我的地图应用程序遇到了同样的问题）

尝试加载地图，看看LogCat，它应该说一个关于错误的api密钥的东西。

在该行附近，它应该告诉您sha1代码，然后是完全限定的应用程序包。将密钥+包复制到剪贴板（看起来就像您给谷歌创建第一个密钥的那个，类似于3e:f4:ae:...;com.example.mapApp。

现在转到googles dev console - ＆gt;你的项目 - ＆gt; API和auth - ＆gt;证书。在下面找到您的密钥，然后点击Edit allowed android applications。将您之前复制的代码放在这里，按确定，然后享受您现在加载的地图。