我正在将地图集成到我的应用程序中。该地图也显示在应用程序中。但是我找不到它的观点。
这是我的片段类。
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.search_fragment,
container, false);
googleMap = ((SupportMapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
// googleMap.setMyLocationEnabled(true);
// googleMap.getUiSettings().setZoomControlsEnabled(false);
return rootView;
}
}
我收到了空指针异常。
日志猫如下：
FATAL EXCEPTION: main
: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.herobike.main/com.herobike.service.SearchActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2062)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2087)
at android.app.ActivityThread.access$600(ActivityThread.java:133)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1198)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4803)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.herobike.service.SearchActivity$PlaceholderFragment.onCreateView(SearchActivity.java:52)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1467)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:570)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1163)
at android.app.Activity.performStart(Activity.java:5018)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2035)
行号：52是
googleMap = ((SupportMapFragment) getFragmentManager()
.findFragmentById(R.id.map)).getMap();
这是片段的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"
android:background="@drawable/sc_10"
tools:context="com.herobike.main.SearchActivity$PlaceholderFragment" >
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginBottom="2dp" />
这里需要更新什么？
在您的布局文件中，而不是MapFragment您需要编写的文件，SupportMapFragment因为您已经使用对其进行了访问SupportMapFragment。因此，请如下进行更改：
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginBottom="2dp" />
还要如下初始化地图：
googleMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
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