java - 谷歌地图不会显示

Question

我正在开发一个涉及“兴趣点”定位器的项目。我有一个生成的 Google Maps API v2 key ，并且已将所有适当的权限添加到 AndroidManifest(如下所示)，并且所有内容都会编译......除了 map 本身!有一个标记显示您当前的位置以及 GPS 坐标，但不显示 map ，这无疑是必不可少的。此外，除了 LogCat 在某些点显示“需要处理的输出太多”之外，也没有任何运行时错误。任何帮助将不胜感激。

Android list

    package="com.example.kavin_000.travelapplication" >
    <!-- suppress AndroidDomInspection -->
    <uses-sdk
    android:minSdkVersion="7"
    android:targetSdkVersion="19" />

    <permission
        android:name="com.example.kavin_000.travelapplication.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />


    <uses-permission android:name="com.example.kavin_000.travelapplication.permission.MAPS_RECEIVE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/nyit_icon"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".ow_main_page"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name=".manhattan_main_page"
            android:label="@string/title_activity_manhattan_main_page" >
        </activity>
        <activity
            android:name=".main_page"
            android:label="Travel Application" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

        <activity
            android:name=".ow_campus_points_of_interest"
            android:label="@string/title_activity_ow_campus_points_of_interest" >
        </activity>
        <activity
            android:name=".manhattan_campus_points_of_interest"
            android:label="@string/title_activity_manhattan_campus_points_of_interest" >
        </activity>

        <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="MY_KEY" />

    </application>

</manifest>

布局 XML 文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".ow_main_page"
    android:background="#ffffb502">

    <fragment
        android:id="@+id/googleMap"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.SupportMapFragment"
        android:layout_above="@+id/latlongLocation" />

    <TextView
        android:id="@+id/latlongLocation"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="bottom"
        android:layout_alignParentBottom="true"
        android:background="#ff058fff"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:textColor="#ffffffff"
        android:paddingLeft="5dp"
        android:paddingRight="5dp" />



</RelativeLayout>

有问题的 Java 类

package com.example.kavin_000.travelapplication;

import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class ow_campus_points_of_interest extends FragmentActivity implements LocationListener {

    GoogleMap googleMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //show error dialog if GooglePlayServices not available
        if (!isGooglePlayServicesAvailable()) {
            finish();
        }
        setContentView(R.layout.activity_ow_campus_points_of_interest);
        SupportMapFragment supportMapFragment =
                (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.googleMap);
        googleMap = supportMapFragment.getMap();
        googleMap.setMyLocationEnabled(true);
        LocationManager locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
        Criteria criteria = new Criteria();
        String bestProvider = locationManager.getBestProvider(criteria, true);
        Location location = locationManager.getLastKnownLocation(bestProvider);
        if (location != null) {
            onLocationChanged(location);
        }
        locationManager.requestLocationUpdates(bestProvider, 20000, 0, this);
    }

    @Override
    public void onLocationChanged(Location location) {
        TextView locationTv = (TextView) findViewById(R.id.latlongLocation);
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        LatLng latLng = new LatLng(latitude, longitude);
        googleMap.addMarker(new MarkerOptions().position(latLng));
        googleMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        googleMap.animateCamera(CameraUpdateFactory.zoomTo(15));
        locationTv.setText("Latitude:" + latitude + ", Longitude:" + longitude);
    }

    @Override
    public void onProviderDisabled(String provider) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onProviderEnabled(String provider) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onStatusChanged(String provider, int status, Bundle extras) {
        // TODO Auto-generated method stub
    }

    private boolean isGooglePlayServicesAvailable() {
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this);
        if (ConnectionResult.SUCCESS == status) {
            return true;
        } else {
            GooglePlayServicesUtil.getErrorDialog(status, this, 0).show();
            return false;
        }
    }
}

Answer 1

听起来您在 Google App Engine 上的授权可能存在问题。您是否确保使用 debug.keystore 中的 SHA1 指纹而不是发布 keystore 中的 SHA1 指纹？此外，请确保将 ;com.example.kavin_000.travelapplication 附加到 SHA1 指纹的末尾。

如果您尚未将 SHA1 指纹添加到授权应用程序列表中，这就是问题所在。可以通过找到您的 debug.keystore 文件(根据您的操作系统在 Google 上搜索)并运行以下命令来完成:

keytool -list -v -keystore debug.keystore