Question

我正在尝试运行Google地图的简单演示应用。我引用了标准文章。

但是我的错误导致类片段异常。

我已正确更新了mt清单。已注册Map API密钥。安装google-play-services并将其链接到我当前的项目。从FragmentActivity扩展我的活动，但它仍然无法正常工作。

我做错了吗？

我也提到Error inflating class fragment但无济于事。任何帮助表示赞赏。

我的代码如下： activity_main.xml中

<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"
    tools:context=".MainActivity" >

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

</RelativeLayout>

MainActivity.java

package com.android.googlemapsdemo;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
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.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class MainActivity extends FragmentActivity {
    static final LatLng HAMBURG = new LatLng(53.558, 9.927);
    static final LatLng KIEL = new LatLng(53.551, 9.993);
    private GoogleMap map;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                .getMap();
        if (map != null) {
            Marker hamburg = map.addMarker(new MarkerOptions()
                    .position(HAMBURG).title("Hamburg"));
            Marker kiel = map.addMarker(new MarkerOptions()
                    .position(KIEL)
                    .title("Kiel")
                    .snippet("Kiel is cool")
                    .icon(BitmapDescriptorFactory
                            .fromResource(R.drawable.ic_launcher)));

            // Move the camera instantly to hamburg with a zoom of 15.
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));

            // Zoom in, animating the camera.
            map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
        } else {
            map = ((MapFragment) getFragmentManager()
                    .findFragmentById(R.id.map)).getMap();
            if (map == null) {
                Toast.makeText(MainActivity.this, "Unable to generate map",
                        Toast.LENGTH_SHORT).show();
            }
        }
    }
}

的AndroidManifest.xml

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

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="19" />

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

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

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

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

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyAT9_V5YI-7CMf_Yta0Y_zeDfPZeH5XFL0" />
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
    </application>

</manifest>

Answer 1

我认为你应该改变这个

class="com.google.android.gms.maps.MapFragment"

到

class="com.google.android.gms.maps.SupportMapFragment"

因为您的minsdk="11"

也改变了这个

 map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
            .getMap();

到

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

Answer 2

更改此

 <uses-sdk
    android:minSdkVersion="11"

到

 <uses-sdk
    android:minSdkVersion="12"

如果你有11，你将使用SupportMapFragment。考虑一下这个

https://developer.android.com/about/dashboards/index.html?utm_source=ausdroid.net

查看链接，最好更改为12

更改此

public class MainActivity extends FragmentActivity

到

public class MainActivity extends Activity

同样getMap()可以返回null。更好地检查谷歌地图服务的可用性。

你也错过了

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

清单文件中的

https://developers.google.com/maps/documentation/android/start#getting_the_google_maps_android_api_v2

您也可以删除

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

和这个

 <uses-permission android:name="com.android.googlemapsdemo.permission.MAPS_RECEIVE" />

在尝试使用Google地图时错误地膨胀类片段

2 个答案: