当我运行我的android项目时，我的一个用于地理编码的类显示了一个io异常，比如服务不可用我无法找到这里的错误，请有人帮我解决这个问题
我的班级
String addressInput = "Santa Clara";
geocoder = new Geocoder(Find_Tab_MainActivity.this);
List<Address> address;
address = geocoder.getFromLocationName(addressInput,5);
if (address == null) {
alert.showAlertDialog(Find_Tab_MainActivity.this, "Places Error",
"Sorry error occured.",
false);
}
else{
Address location = address.get(0);
latitude = location.getLatitude();
longitude = location.getLongitude();
System.out.println("radius:");
nearPlaces = googlePlaces.Keywordsearch(latitude,longitude,radius+40000,"parking",type);
logcat的
03-07 12:55:09.752: D/Your Location(3625): latitude:37.422005, longitude: -122.084095
03-07 12:55:09.812: W/System.err(3625): java.io.IOException: Service not Available
03-07 12:55:09.862: W/System.err(3625): at android.location.Geocoder.getFromLocationName(Geocoder.java:178)
03-07 12:55:09.872: W/System.err(3625): at com.kodspider.parkon.Find_Tab_MainActivity$LoadPlaces.doInBackground(Find_Tab_MainActivity.java:174)
03-07 12:55:09.872: W/System.err(3625): at com.kodspider.parkon.Find_Tab_MainActivity$LoadPlaces.doInBackground(Find_Tab_MainActivity.java:1)
03-07 12:55:09.872: W/System.err(3625): at android.os.AsyncTask$2.call(AsyncTask.java:185)
03-07 12:55:09.872: W/System.err(3625): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
03-07 12:55:09.872: W/System.err(3625): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
03-07 12:55:09.872: W/System.err(3625): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
03-07 12:55:09.872: W/System.err(3625): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
03-07 12:55:09.872: W/System.err(3625): at java.lang.Thread.run(Thread.java:1019)
03-07 12:55:10.042: D/AndroidRuntime(3625): Shutting down VM
03-07 12:55:10.042: W/dalvikvm(3625): threadid=1: thread exiting with uncaught exception (group=0x40015560)
03-07 12:55:10.052: E/AndroidRuntime(3625): FATAL EXCEPTION: main
03-07 12:55:10.052: E/AndroidRuntime(3625): java.lang.NullPointerException
03-07 12:55:10.052: E/AndroidRuntime(3625): at com.kodspider.parkon.Find_Tab_MainActivity$LoadPlaces.onPostExecute(Find_Tab_MainActivity.java:208)
03-07 12:55:10.052: E/AndroidRuntime(3625): at com.kodspider.parkon.Find_Tab_MainActivity$LoadPlaces.onPostExecute(Find_Tab_MainActivity.java:1)
03-07 12:55:10.052: E/AndroidRuntime(3625): at android.os.AsyncTask.finish(AsyncTask.java:417)
03-07 12:55:10.052: E/AndroidRuntime(3625): at android.os.AsyncTask.access$300(AsyncTask.java:127)
03-07 12:55:10.052: E/AndroidRuntime(3625): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
03-07 12:55:10.052: E/AndroidRuntime(3625): at android.os.Handler.dispatchMessage(Handler.java:99)
03-07 12:55:10.052: E/AndroidRuntime(3625): at android.os.Looper.loop(Looper.java:130)
03-07 12:55:10.052: E/AndroidRuntime(3625): at android.app.ActivityThread.main(ActivityThread.java:3683)
03-07 12:55:10.052: E/AndroidRuntime(3625): at java.lang.reflect.Method.invokeNative(Native Method)
03-07 12:55:10.052: E/AndroidRuntime(3625): at java.lang.reflect.Method.invoke(Method.java:507)
03-07 12:55:10.052: E/AndroidRuntime(3625): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
03-07 12:55:10.052: E/AndroidRuntime(3625): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
03-07 12:55:10.052: E/AndroidRuntime(3625): at dalvik.system.NativeStart.main(Native Method)
03-07 12:55:11.892: I/Process(3625): Sending signal. PID: 3625 SIG: 9