本文介绍了Android的GoogleMap的或SupportMapFragment - 空指针异常的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
在我的应用我表示片段谷歌地图版本2。但我得到空指针异常在
MMAP =((SupportMapFragment)getFragmentManager()findFragmentById(R.id.map)。)的GetMap();
这是我的全部code:
公共类SearchResultMap扩展片段{
私人GoogleMap的MMAP;
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
}
@覆盖
公共查看onCreateView(LayoutInflater充气,容器的ViewGroup,
捆绑savedInstanceState){
查看fragmentView = inflater.inflate(R.layout.map,集装箱,假);
MMAP =((SupportMapFragment)getFragmentManager()findFragmentById(R.id.map)。)的GetMap()。 //线路班次:28
mMap.addMarker(新MarkerOptions().position(新经纬度(XXXXXX,XXXXXX)).title伪(当前位置)
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ball_pointer))
是.snippet(XXXXX));
返回fragmentView;
}
@覆盖
公共无效onActivityCreated(包savedInstanceState){
super.onActivityCreated(savedInstanceState);
}
}
XML:
< LinearLayout中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =match_parent
机器人:layout_height =match_parent
机器人:方向=垂直>
<片段
机器人:ID =@ + ID /图
机器人:名称=com.google.android.gms.maps.SupportMapFragment
机器人:layout_width =match_parent
机器人:layout_height =match_parent/>
< / LinearLayout中>
清单XML:
<舱单的xmlns:机器人=http://schemas.android.com/apk/res/android
包=com.fssd.spot
安卓版code =1
机器人:VERSIONNAME =1.0>
<用途-SDK
安卓的minSdkVersion =8
机器人:targetSdkVersion =17/>
<许可
机器人:名称=com.fssd.spot.permission.MAPS_RECEIVE
安卓的ProtectionLevel =签名/>
<用途特征
机器人:glEsVersion =0x00020000
机器人:要求=真/>
<使用-权限的Android:名称=com.fssd.spot.permission.MAPS_RECEIVE/>
<使用-权限的Android:名称=android.permission.INTERNET对/>
<使用-权限的Android:名称=android.permission.WRITE_EXTERNAL_STORAGE/>
<使用-权限的Android:名称=com.google.android.providers.gsf.permission.READ_GSERVICES/>
<使用-权限的Android:名称=android.permission.ACCESS_COARSE_LOCATION/>
<使用-权限的Android:名称=android.permission.ACCESS_FINE_LOCATION/>
<使用-权限的Android:名称=android.permission.ACCESS_NETWORK_STATE/>
<应用
机器人:allowBackup =真
机器人:图标=@可绘制/ ic_launcher
机器人:标签=@字符串/ APP_NAME
机器人:主题=@风格/ AppTheme>
<活动
机器人:名称=com.fssd.spot.SplashScreen
机器人:主题=@安卓风格/ Theme.Light.NoTitleBar
机器人:noHistory =真
机器人:screenOrientation =画像>
<意向滤光器>
<作用机器人:名称=android.intent.action.MAIN/>
<类机器人:名称=android.intent.category.LAUNCHER/>
&所述; /意图滤光器>
< /活性GT;
<活动
机器人:名称=com.fssd.spot.MainActivity
机器人:screenOrientation =画像
机器人:主题=@风格/ tabTheme>
< /活性GT;
&所述;元数据
机器人:名称=com.google.android.maps.v2.API_KEY
机器人:值=xxxxxxxxxxxxxxxxxxxxxxxx/>
< /用途>
< /舱单>
全日志的猫:
致命异常:主要
显示java.lang.NullPointerException
在com.fssd.spot.search.SearchResultMap.onCreateView(SearchResultMap.java:28)
在android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
在android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
在android.support.v4.app.Fragment.performStart(Fragment.java:1499)
在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:957)
在android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
在android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
在android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
在android.support.v4.app.FragmentManagerImpl $ 1.运行(FragmentManager.java:440)
在android.os.Handler.handleCallback(Handler.java:587)
在android.os.Handler.dispatchMessage(Handler.java:92)
在android.os.Looper.loop(Looper.java:130)
在android.app.ActivityThread.main(ActivityThread.java:3683)
在java.lang.reflect.Method.invokeNative(本机方法)
在java.lang.reflect.Method.invoke(Method.java:507)
在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:875)
在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:633)
在dalvik.system.NativeStart.main(本机方法)
解决方案
试图改变这样的:
FragmentManager myFM = getActivity()getSupportFragmentManager();
最后SupportMapFragment myMAPF =(SupportMapFragment)myFM
.findFragmentById(R.id.map);
In my app i showing google map version2 in a fragment. but i get Null pointer exceptionat
mMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
This is my full code:
public class SearchResultMap extends Fragment{
private GoogleMap mMap;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragmentView = inflater.inflate(R.layout.map, container, false);
mMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap(); // line no : 28
mMap.addMarker(new MarkerOptions() .position(new LatLng(xxxxxx,xxxxxx)) .title("Current Location")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.ball_pointer))
.snippet("xxxxx"));
return fragmentView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
Manifest xml:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.fssd.spot"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<permission
android:name="com.fssd.spot.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<uses-permission android:name="com.fssd.spot.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" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.fssd.spot.SplashScreen"
android:theme="@android:style/Theme.Light.NoTitleBar"
android:noHistory="true"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.fssd.spot.MainActivity"
android:screenOrientation="portrait"
android:theme="@style/tabTheme" >
</activity>
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="xxxxxxxxxxxxxxxxxxxxxxxx" />
</application>
</manifest>
whole log cat:
FATAL EXCEPTION: main
java.lang.NullPointerException
at com.fssd.spot.search.SearchResultMap.onCreateView(SearchResultMap.java:28)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
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:1460)
at android.support.v4.app.Fragment.performStart(Fragment.java:1499)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:957)
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:1460)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:440)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:875)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:633)
at dalvik.system.NativeStart.main(Native Method)
解决方案
try to change this:
FragmentManager myFM = getActivity().getSupportFragmentManager();
final SupportMapFragment myMAPF = (SupportMapFragment) myFM
.findFragmentById(R.id.map);
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