SupportMapFragment出现空白(地图谷歌V2)

Question

我想在Fragment容器中加载SupportMapFragment。我没有得到错误，我的API密钥是好的，谷歌播放服务库被导入和所有权限被调用。

我这样调用MapFragment:

MapaFragment fragment = new MapaFragment();
FragmentTransaction ft2 = getFragmentManager().beginTransaction();
ft2.replace(android.R.id.tabcontent, fragment)          
    .commit();

Fragment如下:

public class MapaFragment extends SupportMapFragment {
private View v;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    v=inflater.inflate(R.layout.mapa, null);
    return v;       
}

地图的布局就像这样简单:

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

Answer 1

您已经在xml布局文件中添加了SupportMapFragment，没有必要在代码中再次添加它或重写onCreateView方法，只需注释掉这些

MapaFragment fragment = new MapaFragment();
FragmentTransaction ft2 = getFragmentManager().beginTransaction();
ft2.replace(android.R.id.tabcontent, fragment)          
    .commit();

和这些

private View v;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    super.onCreateView(inflater, container, savedInstanceState);
    v=inflater.inflate(R.layout.mapa, null);
    return v;       
}

并尝试运行

Answer 2

您确定您的API密钥没问题吗?请尝试这个函数来检查你的活动的onCreate方法:

 private void getShaKey() {
 try {
 PackageInfo info = getPackageManager().getPackageInfo("YOUR_PACKAGE_NAME",
 PackageManager.GET_SIGNATURES);
 for (Signature signature : info.signatures) {
 MessageDigest md = MessageDigest.getInstance("SHA");
 md.update(signature.toByteArray());
 Log.v(TAG, "KeyHash:" + Base64.encodeToString(md.digest(),
 Base64.DEFAULT));
 }
 } catch (NameNotFoundException e) {
 e.printStackTrace();
 } catch (NoSuchAlgorithmException e) {
 e.printStackTrace();
 }
 }

看它是否返回和你在manifest中输入的相同的结果:

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

请检查getMap()是否像这样返回null:

GoogleMap myMap;
myMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.mapa)).getMap();
if(myMap != null){
...
}

你可以在"return v"语句之前的onCreateView方法中这样做