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为什么当AsyncTask执行应用程序总是强制停止？(why when AsyncTask execution the app always force stop?)

编程入门 行业动态 更新时间:2024-10-13 22:25:48
为什么当AsyncTask执行应用程序总是强制停止？(why when AsyncTask execution the app always force stop?)

为什么当AsyncTask执行应用程序总是强制停止？ 有2个结果，首先是如果AsyncTask success access将强制停止的url，并且如果failed to access url将显示错误并且不强制停止。

这是我的代码：

private void insertToDatabase(final String alamat) { class SendPostReqAsyncTask extends AsyncTask<String, Void, String> { @Override protected void onPreExecute() { myProgressDialog = new ProgressDialog(MainActivity.this); myProgressDialog.setIndeterminate(true); myProgressDialog.setMessage("Loading..."); myProgressDialog.setCancelable(true); myProgressDialog.show(); } @Override protected String doInBackground(String... params) { String text = null; String urlATM = alamat; try { JSONArray data = new JSONArray(getJSONUrl(urlATM)); if(data.length()!=0){ HashMap<String, String> map; for (int i = 0; i < data.length(); i++) { JSONObject c = data.getJSONObject(i); map = new HashMap<String, String>(); map.put("id_atm", c.getString("id_atm")); map.put("id_bank", c.getString("id_bank")); map.put("nama_bank", c.getString("nama_bank")); map.put("latitude", c.getString("latitude")); map.put("longitude", c.getString("longitude")); map.put("name", c.getString("name")); map.put("email", c.getString("email")); MyArrListATM.add(map); //end add marker maps.addMarker(new MarkerOptions() .title("ATM"+MyArrListATM.get(i) .get("nama_bank")) .snippet("24 Jam") .position(new LatLng( Double.parseDouble(MyArrListATM.get(i).get("latitude")), Double.parseDouble(MyArrListATM.get(i).get("longitude"))))); } myProgressDialog.dismiss(); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); text = e.getMessage(); } // return text; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); myProgressDialog.dismiss(); AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); alertDialog.setTitle("PERINGATAN"); alertDialog.setMessage("Error: "+result); alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "TUTUP", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); alertDialog.show(); } } SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask(); sendPostReqAsyncTask.execute(alamat); }

以及显示给此代码的错误：

sendPostReqAsyncTask.execute(alamat);

我做错了吗？

logcat的：

07-15 15:33:53.196 19175-23224/com.emergency.e_place E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #4 Process: com.emergency.e_place, PID: 19175 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:300) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) at java.util.concurrent.FutureTask.setException(FutureTask.java:222) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:841) Caused by: java.lang.IllegalStateException: Not on the main thread at maps.f.g.b(Unknown Source) at maps.z.F.a(Unknown Source) at maps.af.t.a(Unknown Source) at vl.onTransact(:com.google.android.gms.DynamiteModulesB:167) at android.os.Binder.transact(Binder.java:361) at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.addMarker(Unknown Source) at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source) at com.emergency.e_place.MainActivity$1SendPostReqAsyncTask.doInBackground(MainActivity.java:584) at com.emergency.e_place.MainActivity$1SendPostReqAsyncTask.doInBackground(MainActivity.java:552) at android.os.AsyncTask$2.call(AsyncTask.java:288) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)  at java.lang.Thread.run(Thread.java:841)  07-15 15:33:54.606 19175-19175/com.emergency.e_place E/WindowManager: android.view.WindowLeaked: Activity com.emergency.e_place.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41a95858 V.E..... R......D 0,0-471,144} that was originally added here at android.view.ViewRootImpl.<init>(ViewRootImpl.java:451) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:267) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) at android.app.Dialog.show(Dialog.java:289) at com.emergency.e_place.MainActivity$1SendPostReqAsyncTask.onPreExecute(MainActivity.java:559) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587) at android.os.AsyncTask.execute(AsyncTask.java:535) at com.emergency.e_place.MainActivity.insertToDatabase(MainActivity.java:629) at com.emergency.e_place.MainActivity.access$1000(MainActivity.java:77) at com.emergency.e_place.MainActivity$17.onNavigationItemSelected(MainActivity.java:961) at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:136) at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811) at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153) at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) at android.support.design.internal.NavigationMenuPresenter.onItemClick(NavigationMenuPresenter.java:187) at android.widget.AdapterView.performItemClick(AdapterView.java:308) at android.widget.AbsListView.performItemClick(AbsListView.java:1510) at android.widget.AbsListView$PerformClick.run(AbsListView.java:3472) at android.widget.AbsListView$3.run(AbsListView.java:4835) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5511) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) at dalvik.system.NativeStart.main(Native Method)

why when AsyncTask execution the app always force stop? There's have 2 result, first is if the AsyncTask success access the url that will force stop, and if failed to access the url will show the error and that not force stop.

this is my code:

private void insertToDatabase(final String alamat) { class SendPostReqAsyncTask extends AsyncTask<String, Void, String> { @Override protected void onPreExecute() { myProgressDialog = new ProgressDialog(MainActivity.this); myProgressDialog.setIndeterminate(true); myProgressDialog.setMessage("Loading..."); myProgressDialog.setCancelable(true); myProgressDialog.show(); } @Override protected String doInBackground(String... params) { String text = null; String urlATM = alamat; try { JSONArray data = new JSONArray(getJSONUrl(urlATM)); if(data.length()!=0){ HashMap<String, String> map; for (int i = 0; i < data.length(); i++) { JSONObject c = data.getJSONObject(i); map = new HashMap<String, String>(); map.put("id_atm", c.getString("id_atm")); map.put("id_bank", c.getString("id_bank")); map.put("nama_bank", c.getString("nama_bank")); map.put("latitude", c.getString("latitude")); map.put("longitude", c.getString("longitude")); map.put("name", c.getString("name")); map.put("email", c.getString("email")); MyArrListATM.add(map); //end add marker maps.addMarker(new MarkerOptions() .title("ATM"+MyArrListATM.get(i) .get("nama_bank")) .snippet("24 Jam") .position(new LatLng( Double.parseDouble(MyArrListATM.get(i).get("latitude")), Double.parseDouble(MyArrListATM.get(i).get("longitude"))))); } myProgressDialog.dismiss(); } } catch (JSONException e) { // TODO Auto-generated catch block e.printStackTrace(); text = e.getMessage(); } // return text; } @Override protected void onPostExecute(String result) { super.onPostExecute(result); myProgressDialog.dismiss(); AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create(); alertDialog.setTitle("PERINGATAN"); alertDialog.setMessage("Error: "+result); alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "TUTUP", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); alertDialog.show(); } } SendPostReqAsyncTask sendPostReqAsyncTask = new SendPostReqAsyncTask(); sendPostReqAsyncTask.execute(alamat); }

and the error showing to this code:

sendPostReqAsyncTask.execute(alamat);

am I doing some wrong?

logcat:

07-15 15:33:53.196 19175-23224/com.emergency.e_place E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #4 Process: com.emergency.e_place, PID: 19175 java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:300) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355) at java.util.concurrent.FutureTask.setException(FutureTask.java:222) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587) at java.lang.Thread.run(Thread.java:841) Caused by: java.lang.IllegalStateException: Not on the main thread at maps.f.g.b(Unknown Source) at maps.z.F.a(Unknown Source) at maps.af.t.a(Unknown Source) at vl.onTransact(:com.google.android.gms.DynamiteModulesB:167) at android.os.Binder.transact(Binder.java:361) at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.addMarker(Unknown Source) at com.google.android.gms.maps.GoogleMap.addMarker(Unknown Source) at com.emergency.e_place.MainActivity$1SendPostReqAsyncTask.doInBackground(MainActivity.java:584) at com.emergency.e_place.MainActivity$1SendPostReqAsyncTask.doInBackground(MainActivity.java:552) at android.os.AsyncTask$2.call(AsyncTask.java:288) at java.util.concurrent.FutureTask.run(FutureTask.java:237) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)  at java.lang.Thread.run(Thread.java:841)  07-15 15:33:54.606 19175-19175/com.emergency.e_place E/WindowManager: android.view.WindowLeaked: Activity com.emergency.e_place.MainActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{41a95858 V.E..... R......D 0,0-471,144} that was originally added here at android.view.ViewRootImpl.<init>(ViewRootImpl.java:451) at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:267) at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69) at android.app.Dialog.show(Dialog.java:289) at com.emergency.e_place.MainActivity$1SendPostReqAsyncTask.onPreExecute(MainActivity.java:559) at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:587) at android.os.AsyncTask.execute(AsyncTask.java:535) at com.emergency.e_place.MainActivity.insertToDatabase(MainActivity.java:629) at com.emergency.e_place.MainActivity.access$1000(MainActivity.java:77) at com.emergency.e_place.MainActivity$17.onNavigationItemSelected(MainActivity.java:961) at android.support.design.widget.NavigationView$1.onMenuItemSelected(NavigationView.java:136) at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:811) at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153) at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:958) at android.support.design.internal.NavigationMenuPresenter.onItemClick(NavigationMenuPresenter.java:187) at android.widget.AdapterView.performItemClick(AdapterView.java:308) at android.widget.AbsListView.performItemClick(AbsListView.java:1510) at android.widget.AbsListView$PerformClick.run(AbsListView.java:3472) at android.widget.AbsListView$3.run(AbsListView.java:4835) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:146) at android.app.ActivityThread.main(ActivityThread.java:5511) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099) at dalvik.system.NativeStart.main(Native Method)

最满意答案

必须在UI线程上完成map.addMarker ， dismiss dialog或UI中的任何更改

doInBackground（Params ...），在后台线程上调用

所以你应该删除myProgressDialog.dismiss(); 在你的doInBackground并将maps.addMarker...移动到onPostExecute(Result)或onProgressUpdate(Progress...) （因为在UI线程上调用onPostExecute和onProgressUpdate ）

protected String doInBackground(String... params) { ... //end add marker MarkerOptions markerOptions = new MarkerOptions().title()....; onProgressUpdate(markerOptions) } protected void onProgressUpdate(MarkerOptions... values) { maps.addMarker(values); } protected void onPostExecute(String result) { // or you can add all markers to maps in here }

map.addMarker, dismiss dialog or any change in UI must done on the UI thread and

doInBackground(Params...), invoked on the background thread

So you should remove myProgressDialog.dismiss(); in your doInBackground and move maps.addMarker... to onPostExecute(Result) or onProgressUpdate(Progress...) (because onPostExecute and onProgressUpdate invoked on the UI thread)

protected String doInBackground(String... params) { ... //end add marker MarkerOptions markerOptions = new MarkerOptions().title()....; onProgressUpdate(markerOptions) } protected void onProgressUpdate(MarkerOptions... values) { maps.addMarker(values); } protected void onPostExecute(String result) { // or you can add all markers to maps in here }

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本文标签：应用程序   execution   AsyncTask   stop   force

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