[英]Android app crashes when adding Google map markers
I am currently working on adding some markers on a Google map, but whenever I try to add a marker to the map, the app crashes. 我目前正在努力在Google地图上添加一些标记,但是每当我尝试向地图上添加标记时,应用都会崩溃。 Here is the code I've written
这是我写的代码
createMapView();
googleMap.addMarker(new MarkerOptions()
.position(new LatLng(10, 10))
.title("Hello world"));
Where the createMapView() method is defined as : 其中createMapView()方法定义为:
private void createMapView(){
try {
if(null == googleMap){
googleMap = ((MapFragment) getFragmentManager().findFragmentById(
R.id.map)).getMap();
if(null == googleMap) {
Toast.makeText(getApplicationContext(),
"Error creating map", Toast.LENGTH_SHORT).show();
}
}
} catch (NullPointerException exception){
Log.e("mapApp", exception.toString());
}
The createMapView() method works fine. createMapView()方法可以正常工作。
But, whenever I call the addMarker method on my googleMap object, the app crashes. 但是,每当我在googleMap对象上调用addMarker方法时,应用程序就会崩溃。
In case you need to check my Manifest file: 如果您需要检查我的清单文件:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<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-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".ResultActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- Goolge Maps API Key -->
<meta-data
android:name="com.google.android.maps.v2.API_KEY"
android:value="xxxxxMyKeyxxxxx" />
<meta-data
android:name="com.google.android.gms.version"
android:value="@integer/google_play_services_version" />
</application>
Here are the logs I get when the app crashes: 以下是应用程序崩溃时得到的日志:
03-26 08:34:46.445 28626-28626/com.example.omarlahlou.comforttrain E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.omarlahlou.comforttrain, PID: 28626
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.omarlahlou.comforttrain/com.example.omarlahlou.comforttrain.ResultActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2338)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:824)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:640)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.example.omarlahlou.comforttrain.ResultActivity.onCreate(ResultActivity.java:47)
at android.app.Activity.performCreate(Activity.java:5264)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:110)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invokeNative(Native Method)
Use this code: 使用此代码:
if(googleMap!=null){
googleMap.addMarker(new MarkerOptions()
.position(new LatLng(10, 10))
.title("Hello world"));
}
http://www.tutorialspoint.com/android/android_google_maps.html https://developers.google.com/maps/documentation/android/marker http://www.tutorialspoint.com/android/android_google_maps.html https://developers.google.com/maps/documentation/android/marker
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