在谷歌中映射V2…fragment.getMap()返回null

I can't get the map ! all I can get is null.

我找不到地图!我只能得到零。

here is the code.

这是代码。

       public class MainActivity extends FragmentActivity {

     @Override
     protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        SupportMapFragment fragment = new SupportMapFragment();
        getSupportFragmentManager().beginTransaction()
                .add(android.R.id.content, fragment).commit();


       GoogleMap map;
        map = fragment.getMap();
             //here i cant access this snippet because map = null 
        if(map!=null){
        UiSettings mm = map.getUiSettings();
        map.setMyLocationEnabled(true);
          } }
           }

The manifest:

清单:

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.anywhere_reminder"
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.anywhere_reminder.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

 <uses-permission android:name="com.example.anywhere_reminder.permission.MAPS_RECEIVE" />
 <uses-permission android:name="android.permission.INTERNET" />
 <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
 <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
 <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/AppTheme" >
    <activity android:name="com.google.android.gms.BuildConfig" />
    <activity
        android:name="com.example.anywhere_reminder.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=" my key "/> 

    </application>
    </manifest>

here is the xml:

这是xml:

  <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 xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/map"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 class="com.google.android.gms.maps.MapFragment"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:text="@string/hello_world" />

  </RelativeLayout>

I tried to solve it like this solution Google Maps Android API v2 throws GooglePlayServicesNotAvailableException, out of date, SupportMapFragment.getMap() returns null .. but still did not work

我试着像这个解决方案谷歌映射Android API v2抛出GooglePlayServicesNotAvailableException，过期，SupportMapFragment.getMap()返回null。但还是没有成功。

UPDATE:

更新:

I got my map working now .. here is the edited working version

我的地图现在可以用了。这里是经过编辑的工作版本

   public class MainActivity extends FragmentActivity {
 private GoogleMap myMap;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);

          android.support.v4.app.FragmentManager myFragmentManager = getSupportFragmentManager();
          SupportMapFragment mySupportMapFragment 
           = (SupportMapFragment)myFragmentManager.findFragmentById(R.id.map);


             myMap = mySupportMapFragment.getMap();
             if(myMap!=null)
            myMap.setMyLocationEnabled(true);


        }

5 个解决方案

#1

You are creating a dynamic fragment, via a FragmentTransaction. When you call commit(), the fragment has not yet been added to the screen, because the FragmentTransaction has only been scheduled to occur -- it has not occurred yet. Hence, the SupportMapFragment has not been called with onCreateView() yet, so there is no GoogleMap.

您正在通过碎片事务创建动态片段。当您调用commit()时，这个片段还没有被添加到屏幕上，因为碎片事务只会发生——它还没有发生。因此，SupportMapFragment还没有被onCreateView()调用，所以这里没有GoogleMap。

Either switch to static fragments (<fragment> tag in a layout), or delay your use of the GoogleMap until after the transaction has been processed.

要么切换到静态片段( tag in a layout)，要么将使用GoogleMap的时间推迟到事务处理完成之后。

5 个解决方案

#1

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