Google Map API v2未在设备上显示地图

Question

我正在运行Google地图文档中为Google Map Api v2提供的示例代码(https://developers.google.com/maps/documentation/android/start#specify_settings_in_the_application_manifest).

代码成功运行,但未在设备上加载Map.设备上仅显示白屏.我使用的是4.0.3版Android设备.

1)我为项目启用了服务.

2)生成密钥:

3)"google-play-services_lib"作为项目中的库:

4)Android Manifest:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.mapdemo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

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

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

    <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE" />
    <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" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyCvZrhQ8YBfyYBvTic3DSdu2O06nAmhpg4" />

        <activity
            android:name="com.example.mapdemo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

5)活动:

package com.example.mapdemo;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;

public class MainActivity extends Activity  {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);      
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}

6)布局:

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
          android:id="@+id/map"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:name="com.google.android.gms.maps.MapFragment"/>

Answer 1

使用片段活动

例如:

public class Maps extends FragmentActivity {
    GoogleMap map;
    double lat;
    double lan;
    boolean flag = false;

    // private LocationManager lm;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mapptry);

        map = ((SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map)).getMap();
                 }
  }

将你的map.xml更改为

<fragment
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="wrap_content"
    android:layout_height="match_parent" />

编辑

也要这样做

import android.support.v4.app.FragmentActivity;

在你这样做之前右键单击project-> properties-> buildpath-> java build path - > libraries ..然后点击添加外部jar

转到

用户\ Android的软件开发工具包\演员\机器人\ SUPPORT\V4

并选择android-support-v4.jar

PS:这一切都提供了您的API密钥是正确的.如果API密钥错误,那么它也只显示白屏