安卓AsyncTask #2致命异常
安卓AsyncTask #2致命异常
提问于 2014-11-11 09:30:54
我有一些问题，AsyncTask #2致命的例外在安卓。因此，我要做的是点击地图，得到坐标X和Y，并将它们传递给AsyncTask()类，以执行一个方法来获取地址。下面是我的单个tap和MyAsyncTask()的代码：
mMapView.setOnSingleTapListener(new OnSingleTapListener() {
public void onSingleTap(float x, float y) {
eventModel.setEventX(String.valueOf(point.getX()));
eventModel.setEventY(String.valueOf(point.getY()));
new MyAsyncTask().execute(eventModel);
CreateEvent.createEventDialog(context, point.getX(),
point.getY(), eventAddress);
Log.i("Addr", eventAddress);
}
});
new MyAsyncTask().execute();
}
public static class MyAsyncTask extends AsyncTask<Event, Integer, Double> {
@Override
protected Double doInBackground(Event... params) {
try {
eventAddress = eventCtrl.getStreetAddressFromGeometry(eventModel.getEventX(), eventModel.getEventY());
eventCtrl.retrieveEventJSON();
if (params.length == 1) {
eventCtrl.createEvent(params[0]);
// Refresh map after successfully added event
eventCtrl.retrieveEventJSON();
eventCtrl.plotEventOnMap(context);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Double result) {
}
protected void onProgressUpdate(Integer... progress) {
}
}以及在EventController中获取基于XY的地址的方法：
public String getStreetAddressFromGeometry(String eventX, String eventY) {
String streetName = "";
try {
URL url = new URL("http://www.onemap.sg/API/services.svc/revgeocode?token=qo/s2TnSUmfLz+32CvLC4RMVkzEFYjxqyti1KhByvEacEdMWBpCuSSQ+IFRT84QjGPBCuz/cBom8PfSm3GjEsGc8PkdEEOEr&location="+eventX+","+eventY+"");
URLConnection conn = (URLConnection) url.openConnection();
BufferedReader br = new BufferedReader(new InputStreamReader(
(conn.getInputStream())));
String responseString;
while ((responseString = br.readLine()) != null) {
try {
JSONObject rawObj = new JSONObject(responseString);
JSONArray searchResults = rawObj.getJSONArray("GeocodeInfo");
for (int i = 0; i < searchResults.length(); i++) {
streetName = searchResults.getJSONObject(i).getString(
"BLOCK")
+ " " + searchResults.getJSONObject(i).getString("ROAD") + " SINGAPORE";
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
} catch (IOException e) {
e.printStackTrace();
}
return streetName;
}在从单个抽头获得地址后，我将其传递给以下方法：
public static Event createEventDialog(final Context context,
final double x, final double y, final String eventAddress) {
AlertDialog.Builder AddDialog = new AlertDialog.Builder(context);
AddDialog.setTitle("Add Event");
LayoutInflater li = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View dialogView = li.inflate(R.layout.create_event, null);
txtEventName = (EditText) dialogView.findViewById(R.id.txtEventName);
txtEventDesc = (EditText) dialogView.findViewById(R.id.txtEventDesc);
txtEventAddr = (EditText) dialogView.findViewById(R.id.txtEventAddr);
txtEventAddr.setText(eventAddress);
AddDialog.setView(dialogView);
AddDialog.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.dismiss();
}
});
AddDialog.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
dialog.dismiss();
}
});
AddDialog.show();
return addEventModel;
}然而，用这些代码，我打印出的地址，从一个点击，它显示的地址。但是当我提示对话框时，它应该显示地址。但是，它没有显示任何内容，几秒钟后，应用程序通过错误消息关闭：
11-11 17:18:28.889: E/AndroidRuntime(4439): FATAL EXCEPTION: AsyncTask #2
11-11 17:18:28.889: E/AndroidRuntime(4439): java.lang.RuntimeException: An error occured while executing doInBackground()
11-11 17:18:28.889: E/AndroidRuntime(4439): at android.os.AsyncTask$3.done(AsyncTask.java:278)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
11-11 17:18:28.889: E/AndroidRuntime(4439): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.lang.Thread.run(Thread.java:856)
11-11 17:18:28.889: E/AndroidRuntime(4439): Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x0
11-11 17:18:28.889: E/AndroidRuntime(4439): at android.content.res.Resources.getValue(Resources.java:1019)
11-11 17:18:28.889: E/AndroidRuntime(4439): at android.content.res.Resources.getDrawable(Resources.java:663)
11-11 17:18:28.889: E/AndroidRuntime(4439): at Controller.EventController.plotEventOnMap(EventController.java:101)
11-11 17:18:28.889: E/AndroidRuntime(4439): at nyp.edu.eneighbourhood.ENeighbourhoodActivity$MyAsyncTask.doInBackground(ENeighbourhoodActivity.java:213)
11-11 17:18:28.889: E/AndroidRuntime(4439): at nyp.edu.eneighbourhood.ENeighbourhoodActivity$MyAsyncTask.doInBackground(ENeighbourhoodActivity.java:1)
11-11 17:18:28.889: E/AndroidRuntime(4439): at android.os.AsyncTask$2.call(AsyncTask.java:264)
11-11 17:18:28.889: E/AndroidRuntime(4439): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
11-11 17:18:28.889: E/AndroidRuntime(4439): ... 5 more
11-11 17:18:35.725: W/SurfaceView(4439): CHECK surface infomation creating=false formatChanged=false sizeChanged=false visible=false visibleChanged=true surfaceChanged=true realSizeChanged=false redrawNeeded=false left=false top=false
11-11 17:18:37.022: E/WindowManager(4439): Activity nyp.edu.eneighbourhood.ENeighbourhoodActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4169d570 that was originally added here
11-11 17:18:37.022: E/WindowManager(4439): android.view.WindowLeaked: Activity nyp.edu.eneighbourhood.ENeighbourhoodActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@4169d570 that was originally added here
11-11 17:18:37.022: E/WindowManager(4439): at android.view.ViewRootImpl.<init>(ViewRootImpl.java:428)
11-11 17:18:37.022: E/WindowManager(4439): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:267)
11-11 17:18:37.022: E/WindowManager(4439): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
11-11 17:18:37.022: E/WindowManager(4439): at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
11-11 17:18:37.022: E/WindowManager(4439): at android.view.Window$LocalWindowManager.addView(Window.java:537)
11-11 17:18:37.022: E/WindowManager(4439): at android.app.Dialog.show(Dialog.java:278)
11-11 17:18:37.022: E/WindowManager(4439): at android.app.AlertDialog$Builder.show(AlertDialog.java:932)
11-11 17:18:37.022: E/WindowManager(4439): at nyp.edu.eneighbourhood.CreateEvent.createEventDialog(CreateEvent.java:124)
11-11 17:18:37.022: E/WindowManager(4439): at nyp.edu.eneighbourhood.ENeighbourhoodActivity$3.onSingleTap(ENeighbourhoodActivity.java:192)
11-11 17:18:37.022: E/WindowManager(4439): at com.esri.android.map.MapOnTouchListener.onSingleTap(Unknown Source)
11-11 17:18:37.022: E/WindowManager(4439): at com.esri.android.map.MapGestureDetector$a.onSingleTapConfirmed(Unknown Source)
11-11 17:18:37.022: E/WindowManager(4439): at android.view.GestureDetector$GestureHandler.handleMessage(GestureDetector.java:393)
11-11 17:18:37.022: E/WindowManager(4439): at android.os.Handler.dispatchMessage(Handler.java:99)
11-11 17:18:37.022: E/WindowManager(4439): at android.os.Looper.loop(Looper.java:137)
11-11 17:18:37.022: E/WindowManager(4439): at android.app.ActivityThread.main(ActivityThread.java:4512)
11-11 17:18:37.022: E/WindowManager(4439): at java.lang.reflect.Method.invokeNative(Native Method)
11-11 17:18:37.022: E/WindowManager(4439): at java.lang.reflect.Method.invoke(Method.java:511)
11-11 17:18:37.022: E/WindowManager(4439): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
11-11 17:18:37.022: E/WindowManager(4439): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
11-11 17:18:37.022: E/WindowManager(4439): at dalvik.system.NativeStart.main(Native Method)
11-11 17:18:38.209: I/Process(4439): Sending signal. PID: 4439 SIG: 9提前谢谢。
编辑
AddDialog.setView(dialogView);
AddDialog.setPositiveButton("Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
addEventModel = new Event();
addEventModel = onConfirmAddEventClicked(context, x, y);
new MyAsyncTask().execute(addEventModel);
dialog.dismiss();
}
});下面是用户从对话框中选择it的部分，它将得到用户的输入，在本例中是在onConfirmEventClicked中完成的。然后它将调用MyAsyncTask来执行DB插入。
回答 1
Stack Overflow用户
回答已采纳
发布于 2014-11-11 09:36:26
代之以调用eventCtrl.plotEventOnMap(context); on postExecute。此方法似乎更改了不能在doInBackground上执行的UI
编辑
您必须在CreateEvent.createEventDialog 完成AsyncTask后调用AsyncTask only。为此，我建议创建一个接口并将其传递给您的任务。这需要一些编码。我们开始吧：
public static class MyAsyncTask extends AsyncTask<Event, Integer, Double> {
public interface OnRoutineFinished{ //interface
void onFinish();
}
private OnRoutineFinished mCallbacks;
public MyAsyncTask(OnRoutineFinished callback){ //constructor with interface
mCallbacks = callback;
}
public MyAsyncTask(){} //empty constructor to maintain compatibility
@Override
protected Double doInBackground(Event... params) {
try {
eventAddress = eventCtrl.getStreetAddressFromGeometry(eventModel.getEventX(), eventModel.getEventY());
eventCtrl.retrieveEventJSON();
if (params.length == 1) {
eventCtrl.createEvent(params[0]);
// Refresh map after successfully added event
eventCtrl.retrieveEventJSON();
eventCtrl.plotEventOnMap(context);
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Double result) {
if(mCallbacks !=null)
mCallbacks.onFinish(); //call interface on finish
}
protected void onProgressUpdate(Integer... progress) {
}
}接下来，在创建异步任务时，在异步完成时传递要调用的事件：
new MyAsyncTask(new MyAsyncTask.OnRoutineFinished() {
@Override
public void onFinish() {
CreateEvent.createEventDialog(context, point.getX(),
point.getY(), eventAddress); //this will be called after the task finishes
}
}).execute(eventModel);页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26861594
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