4

我正在尝试使用新的 Google Play 服务库并将地图嵌入到地图片段中，如下所示

PlaceMapsFragment.java

public class PlaceMapsFragment extends SupportMapFragment {
    private GoogleMap mMap;
    private LatLng mPosFija;

    public PlaceMapsFragment() {
        super();
    }

    public static PlaceMapsFragment newInstance(LatLng posicion) {
        PlaceMapsFragment frag = new PlaceMapsFragment();
        frag.mPosFija = posicion;
        return frag;
    }

    @Override
    public GoogleMap getMap() {
        // TODO Auto-generated method stub
        return super.getMap();
    }

    @Override
    public void onCreate(Bundle arg0) {
        // TODO Auto-generated method stub
        super.onCreate(arg0);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View view = super.onCreateView(inflater, container, savedInstanceState);
        //initMap();
        return view;
    }

    private void initMap() {
        UiSettings settings = getMap().getUiSettings();
        settings.setAllGesturesEnabled(false);
        settings.setMyLocationButtonEnabled(false);

        getMap().moveCamera(CameraUpdateFactory.newLatLngZoom(mPosFija, 16));
        getMap().addMarker(
                new MarkerOptions().position(mPosFija)
                        .icon(BitmapDescriptorFactory
                                .fromResource(R.drawable.marker)));
    }

}

错误

12-10 01:44:54.416: E/AndroidRuntime(32716): FATAL EXCEPTION: main
12-10 01:44:54.416: E/AndroidRuntime(32716): java.lang.NullPointerException
12-10 01:44:54.416: E/AndroidRuntime(32716):    at maps.ar.b.a(Unknown Source)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at maps.y.h.a(Unknown Source)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at maps.y.au.a(Unknown Source)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at maps.y.ae.moveCamera(Unknown Source)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.google.android.gms.maps.internal.IGoogleMapDelegate$Stub.onTransact(IGoogleMapDelegate.java:83)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.os.Binder.transact(Binder.java:297)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.google.android.gms.maps.internal.IGoogleMapDelegate$a$a.moveCamera(Unknown Source)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.google.android.gms.maps.GoogleMap.moveCamera(Unknown Source)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.m7.nomad.PlaceMapsFragment.initMap(PlaceMapsFragment.java:55)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.m7.nomad.PlaceMapsFragment.onCreateView(PlaceMapsFragment.java:46)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.support.v4.app.Fragment.performCreateView(Fragment.java:1460)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:911)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:461)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.m7.nomad.PlaceActivity$TabManager.onTabChanged(PlaceActivity.java:153)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.widget.TabHost.invokeOnTabChangeListener(TabHost.java:379)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.widget.TabHost.setCurrentTab(TabHost.java:364)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:150)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:540)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.view.View.performClick(View.java:3591)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.view.View$PerformClick.run(View.java:14263)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.os.Handler.handleCallback(Handler.java:605)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.os.Handler.dispatchMessage(Handler.java:92)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.os.Looper.loop(Looper.java:137)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at android.app.ActivityThread.main(ActivityThread.java:4507)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at java.lang.reflect.Method.invokeNative(Native Method)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at java.lang.reflect.Method.invoke(Method.java:511)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
12-10 01:44:54.416: E/AndroidRuntime(32716):    at dalvik.system.NativeStart.main(Native Method)

在此处输入图像描述

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.m7.nomad"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

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

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.Sherlock" >
        <activity
            android:name="com.m7.nomad.SplashActivity"
            android:label="@string/app_name" >
        </activity>
        <activity
            android:name="com.m7.nomad.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>
        <activity
            android:name="com.m7.nomad.PlaceActivity"
            android:label="@string/app_name" >
        </activity>

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

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

</manifest>

我有一个 SherlockFragmentActivity，它有一个 TabHost，它附有两个 Fragment。我正在尝试在其中一个选项卡片段中渲染地图

编辑

我已显示要显示的地图，但现在我无法引用地图并将地图更改为混合。基本上我需要参考地图而不会出现 Null 错误。

4

4 回答 4

4

在onCreateView()你必须调用它的父母。在https://stackoverflow.com/a/13734470/835787中查看我的解决方案。地图在 MapFragment 的 onCreateView() 方法中初始化，如果你不调用它，地图将为空。

于 2012-12-07T19:25:53.680 回答
3
  1. super.onCreate(savedInstanceState); 应该在 onCreate() 中调用，而不是 onCreateView()

  2. 如果你想重写 onCreateView()，它应该是这样的：

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = super.onCreateView(inflater, container, savedInstanceState);

    // Do any other initialization you need, but note that the MapView already exists inside v

    setUpMapIfNeeded(v);
    return v;
}
于 2012-12-07T19:52:31.670 回答
2

我不知道它是否有帮助，但你应该在这里设置你的包：

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

<uses-permission android:name="com.example.newmapview.permission.MAPS_RECEIVE" />
于 2012-12-07T14:48:59.420 回答
1

我通过在导入 Google Play 服务库时选中“将项目复制到工作区”解决了这个错误。
更多信息在这里：http: //developer.android.com/google/play-services/setup.html

于 2013-04-19T18:21:32.223 回答