NullPointerException异常使用SupportMapFragment [英] NullPointerException using SupportMapFragment
本文介绍了NullPointerException异常使用SupportMapFragment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
我试图解决这个问题了一些日子。我用的GoogleMaps和SupportMapFragment vorking。当我启动我的应用程序，记录显示这个错误，我的应用程序崩溃。
I'm trying to resolve this issue for some days. I'm vorking with GoogleMaps and SupportMapFragment. When I launch my app, log show this error and my app crash.
下面是我的日志猫：
12-05 11:16:03.437 6931-6931/it.home.dressgallery E/dalvikvm﹕ Could not find class 'android.app.Notification$Builder', referenced from method com.google.android.gms.common.GooglePlayServicesUtil.showErrorNotification
12-05 11:16:08.406 6931-6931/it.home.dressgallery E/dalvikvm﹕ Could not find class 'android.app.Notification$Builder', referenced from method com.google.android.gms.common.l.c
12-05 11:16:08.601 6931-6931/it.home.dressgallery E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.NullPointerException
at com.google.maps.api.android.lib6.c.aa.b(Unknown Source)
at com.google.android.gms.maps.internal.x.onTransact(SourceFile:115)
at android.os.Binder.transact(Binder.java:279)
at com.google.android.gms.maps.internal.IMapFragmentDelegate$a$a.onResume(Unknown Source)
at com.google.android.gms.maps.SupportMapFragment$a.onResume(Unknown Source)
at com.google.android.gms.dynamic.a$7.b(Unknown Source)
at com.google.android.gms.dynamic.a.a(Unknown Source)
at com.google.android.gms.dynamic.a.onResume(Unknown Source)
at com.google.android.gms.maps.SupportMapFragment.onResume(Unknown Source)
at android.support.v4.app.Fragment.performResume(Fragment.java:1547)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:978)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1121)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1484)
at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:482)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1441)
at android.view.View.measure(View.java:8366)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
at android.view.View.measure(View.java:8366)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
at android.view.View.measure(View.java:8366)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
at android.view.View.measure(View.java:8366)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
at android.view.View.measure(View.java:8366)
at android.view.ViewRoot.performTraversals(ViewRoot.java:844)
at android.view.ViewRoot.handleMessage(ViewRoot.java:1865)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
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:842)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
at dalvik.system.NativeStart.main(Native Method)
下面是我的AndroidManifest.xml：
Here is my AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="it.home.dressgallery"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="7" android:targetSdkVersion="19" />
<permission
android:name="it.home.dressgallery.permission.MAPS_RECEIVE"
android:protectionLevel="signature" />
<uses-permission android:name="it.home.dressgallery.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<!-- The following two permissions are not required to use
Google Maps Android API v2, but are recommended. -->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-feature
android:glEsVersion="0x00020000"
android:required="true"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppBaseTheme"
android:hardwareAccelerated="true" >
<meta-data android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="myapikey"/>
<activity
android:name="it.home.dressgallery.MeinActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
这是maps_layout.xml：
This is maps_layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="match_parent"
android:layout_width="match_parent">
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</FrameLayout>
这是MapsFragment.java类：
This is MapsFragment.java class:
package it.home.dressgallery;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.CameraPosition;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
/**
* Created by tank on 04/12/14.
*/
public class MapsFragment extends SupportMapFragment {
private GoogleMap googleMap;
// latitude and longitude
double latitude = 17.385044;
double longitude = 78.486671;
static final LatLng HAMBURG = new LatLng(53.558, 9.927);
static final LatLng KIEL = new LatLng(53.551, 9.993);
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.maps_layout, container, false);
initializeMap();
myAddMarker(latitude, longitude, BitmapDescriptorFactory.HUE_ORANGE);
googleMap.setMyLocationEnabled(true); // false to disable
googleMap.getUiSettings().setZoomControlsEnabled(false); // true to enable
googleMap.getUiSettings().setCompassEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
//googleMap.getUiSettings().setRotateGesturesEnabled(true);
Marker hamburg = googleMap.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = googleMap.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
return view;
}
/**
* function to load map. If map is not created it will create it for you
* */
private void initializeMap() {
if (googleMap == null) {
googleMap = ((SupportMapFragment) getFragmentManager().findFragmentById(R.id.map)).getMap();
// check if map is created successfully or not
if (googleMap == null) {
Toast.makeText(getActivity().getApplicationContext(),"Sorry! unable to create maps", Toast.LENGTH_SHORT).show();
}
}
}
/**
* Function to add a marker on the map
* @param latitude
* @param longitude
* @param color
*/
public void myAddMarker(double latitude, double longitude, float color){
// create and add marker
Marker marker = googleMap.addMarker(new MarkerOptions().position(new LatLng(latitude, longitude))
.title("Hello Maps ").icon(BitmapDescriptorFactory.defaultMarker(color)));
}
/**
* Apart from maps native marker icons, you can use own image to show as a marker. You can load the icon from any kind of supported sources.
* fromAsset(String assetName) – Loading from assets folder
* fromBitmap (Bitmap image) – Loading bitmap image
* fromFile (String path) – Loading from file
* fromResource (int resourceId) – Loading from drawable resource
*/
public void myAddMarkerCustom(double latitude, double longitude, int my_marker_icon){
// create marker
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title("Hello Maps");
// Changing marker icon
marker.icon(BitmapDescriptorFactory.fromResource(my_marker_icon));
// adding marker
googleMap.addMarker(marker);
}
public void moveToPosition(long latitude, long longitude, float zoom){
CameraPosition cameraPosition = new CameraPosition.Builder().target(
new LatLng(latitude, longitude)).zoom(zoom).build();
googleMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));
}
/**
* googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
* googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
* googleMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
* googleMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
* googleMap.setMapType(GoogleMap.MAP_TYPE_NONE);
*/
public void myChangeMap(int type){
googleMap.setMapType(type);
}
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
//selectItem(position);
//TODO...add something to do
}
}
}
我希望有人能帮助我，因为我吓坏了。谢谢！
I hope someone can help me, because I'm freaking out. Thanks!!!
推荐答案
这样的解决办法是添加以下行：
Where is super.onCreateView of your Fragment
so the solution is to add the following line:
super.onCreateView(inflater, container, savedInstanceState);
您 onCreateView（）方法是无用的，没有它。
your onCreateView() method is useless without it.
解决方案：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.maps_layout, container, false);
initializeMap();
myAddMarker(latitude, longitude, BitmapDescriptorFactory.HUE_ORANGE);
googleMap.setMyLocationEnabled(true); // false to disable
googleMap.getUiSettings().setZoomControlsEnabled(false); // true to enable
googleMap.getUiSettings().setCompassEnabled(true);
googleMap.getUiSettings().setMyLocationButtonEnabled(true);
//googleMap.getUiSettings().setRotateGesturesEnabled(true);
Marker hamburg = googleMap.addMarker(new MarkerOptions().position(HAMBURG)
.title("Hamburg"));
Marker kiel = googleMap.addMarker(new MarkerOptions()
.position(KIEL)
.title("Kiel")
.snippet("Kiel is cool")
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.ic_launcher)));
// Move the camera instantly to hamburg with a zoom of 15.
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
// Zoom in, animating the camera.
googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
return view;
}
这篇关于NullPointerException异常使用SupportMapFragment的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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