我正在尝试将 Google Places 连接到 MapView 但出现错误，它之前工作正常，但在将 Android 库更新到最新版本后出现错误。
请让我知道错误是怎么回事。
06-20 05:41:47.429: E/AndroidRuntime(20755): FATAL EXCEPTION: main
06-20 05:41:47.429: E/AndroidRuntime(20755): java.lang.NullPointerException
06-20 05:41:47.429: E/AndroidRuntime(20755): at com.x.get2food.MainActivity$LoadPlaces$1.run(MainActivity.java:217)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.app.Activity.runOnUiThread(Activity.java:3717)
06-20 05:41:47.429: E/AndroidRuntime(20755): at com.x.get2food.MainActivity$LoadPlaces.onPostExecute(MainActivity.java:211)
06-20 05:41:47.429: E/AndroidRuntime(20755): at com.x.get2food.MainActivity$LoadPlaces.onPostExecute(MainActivity.java:1)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.os.AsyncTask.finish(AsyncTask.java:417)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.os.AsyncTask.access$300(AsyncTask.java:127)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:429)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.os.Handler.dispatchMessage(Handler.java:99)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.os.Looper.loop(Looper.java:123)
06-20 05:41:47.429: E/AndroidRuntime(20755): at android.app.ActivityThread.main(ActivityThread.java:3687)
06-20 05:41:47.429: E/AndroidRuntime(20755): at java.lang.reflect.Method.invokeNative(Native Method)
06-20 05:41:47.429: E/AndroidRuntime(20755): at java.lang.reflect.Method.invoke(Method.java:507)
06-20 05:41:47.429: E/AndroidRuntime(20755): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
06-20 05:41:47.429: E/AndroidRuntime(20755): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
06-20 05:41:47.429: E/AndroidRuntime(20755): at dalvik.system.NativeStart.main(Native Method)
错误区域；
// calling background Async task to load Google Places
// After getting places from Google all the data is shown in listview
// Fired @ onCreate()
try{
new LoadPlaces().execute();
}catch(Exception e){}
/**
* Background Async Task to Load Google places
* */
class LoadPlaces extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
protected void onPreExecute()
{
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage(Html.fromHtml("Loading Places..."));
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* getting Places JSON
* */
protected String doInBackground(String... args) {
googlePlaces = new GooglePlaces();
try {
String types = "bus_station";
double radius = 1000;
nearPlaces = googlePlaces.search(gps.getLatitude(),
gps.getLongitude(), radius, types);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
/**
* Updating parsed Places into LISTVIEW
* */
// Get json response status
String status = nearPlaces.status;
// Check for all possible status
if(status.equals("OK")){
// Successfully got places details
if (nearPlaces.results != null) {
// loop through each place
for (Place p : nearPlaces.results) {
HashMap<String, String> map = new HashMap<String, String>();
map.put(KEY_REFERENCE, p.reference);
// Place name
map.put(KEY_NAME, p.name);
// adding HashMap to ArrayList
placesListItems.add(map);
}
// list adapter
ListAdapter adapter = new SimpleAdapter(MainActivity.this, placesListItems,
R.layout.list_item,
new String[] { KEY_REFERENCE, KEY_NAME}, new int[] {
R.id.reference, R.id.name });
// Adding data into listview
lv.setAdapter(adapter);
}
}
else if(status.equals("ZERO_RESULTS")){
// Zero results found
alert.showAlertDialog(MainActivity.this, "Near Places",
"Sorry no places found. Try to change the types of places",
false);
}
else if(status.equals("UNKNOWN_ERROR"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry unknown error occured.",
false);
}
else if(status.equals("OVER_QUERY_LIMIT"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry query limit to google places is reached",
false);
}
else if(status.equals("REQUEST_DENIED"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry error occured. Request is denied",
false);
}
else if(status.equals("INVALID_REQUEST"))
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry error occured. Invalid Request",
false);
}
else
{
alert.showAlertDialog(MainActivity.this, "Places Error",
"Sorry error occured.",
false);
}
}
});
}
}