1

ボタンを押すとダイアログボックスが表示されるクラスがあります。このボックスには YES、NO の 2 つのボタンがあります。はいをクリックすると、非同期タスクを呼び出してDBの値を更新したいと思います。これを試しましたが、 Looper.prepare() エラーが発生します。SOとGOogle全体を検索しましたが、解決策はありません。any1 に何かアイデアはありますか?

ありがとう

bttnSync.setOnClickListener(new OnClickListener() {

        public void onClick(View v) {

            if (isOnline()) {
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                        MainPage.this);
                alertDialogBuilder.setTitle("Syncing all data....!!");
                alertDialogBuilder
                        .setMessage(
                                "Are you sure you want to Sync all the data?")
                        .setCancelable(false)
                        .setPositiveButton("Yes",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(
                                            DialogInterface dialog, int id) {

                                         //call();

                                        new CountDownTask().execute();

                                        MainPage.this.finish();
                                        Intent i = new Intent(
                                                "com.example.collegesoft.MainPage");
                                        startActivity(i);
                                    }
                                })
                        .setNegativeButton("No",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(
                                            DialogInterface dialog, int id) {
                                        dialog.cancel();
                                    }
                                });

                AlertDialog alertDialog = alertDialogBuilder.create();

                // show it
                alertDialog.show();
            } else {
                AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
                        MainPage.this);
                alertDialogBuilder.setTitle("No Internet Connection!!");
                alertDialogBuilder
                        .setMessage(
                                "Device is not connected to the Internet or the connection is slow.")
                        .setCancelable(false)

                        .setNegativeButton("Cancel",
                                new DialogInterface.OnClickListener() {
                                    public void onClick(
                                            DialogInterface dialog, int id) {
                                        dialog.cancel();
                                    }
                                });

                AlertDialog alertDialog = alertDialogBuilder.create();

                // show it
                alertDialog.show();
            }

        }
    });


private class CountDownTask extends AsyncTask<Void, Integer, Void> {

    protected void onPreExecute() {
        progressDialog = ProgressDialog.show(MainPage.this, "Loading...",
                "Loading application , please wait...", false, false);

    }

    protected Void doInBackground(Void... params) {
        call();


        return null;
    }

    protected void onProgressUpdate(Integer... values) {
        progressDialog.setProgress(values[0]);
    }

    protected void onPostExecute(Void result) {
        progressDialog.dismiss();
    }

}


   01-31 10:41:37.575: E/AndroidRuntime(9038): FATAL EXCEPTION: AsyncTask #1
   01-31 10:41:37.575: E/AndroidRuntime(9038): java.lang.RuntimeException: An error   occured while executing doInBackground()
   01-31 10:41:37.575: E/AndroidRuntime(9038):  at android.os.AsyncTask$3.done(AsyncTask.java:278)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
      01-31 10:41:37.575: E/AndroidRuntime(9038):   at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
    01-31 10:41:37.575: E/AndroidRuntime(9038):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
       01-31 10:41:37.575: E/AndroidRuntime(9038):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at java.lang.Thread.run(Thread.java:856)
    01-31 10:41:37.575: E/AndroidRuntime(9038): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at android.os.Handler.<init>(Handler.java:121)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at android.app.Activity.<init>(Activity.java:735)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at com.example.collegesoft.SyncData.<init>(SyncData.java:22)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at com.example.collegesoft.MainPage.call(MainPage.java:259)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at com.example.collegesoft.MainPage$CountDownTask.doInBackground(MainPage.java:284)
     01-31 10:41:37.575: E/AndroidRuntime(9038):    at com.example.collegesoft.MainPage$CountDownTask.doInBackground(MainPage.java:1)
       01-31 10:41:37.575: E/AndroidRuntime(9038):  at android.os.AsyncTask$2.call(AsyncTask.java:264)
      01-31 10:41:37.575: E/AndroidRuntime(9038):   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
   01-31 10:41:37.575: E/AndroidRuntime(9038):  ... 4 more
    01-31 10:41:43.966: E/WindowManager(9038): Activity  com.example.collegesoft.MainPage has leaked window  com.android.internal.policy.impl.PhoneWindow$DecorView@41753818 that was originally added  here
     01-31 10:41:43.966: E/WindowManager(9038): android.view.WindowLeaked: Activity com.example.collegesoft.MainPage has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@41753818 that was originally added here
     01-31 10:41:43.966: E/WindowManager(9038):     at android.view.ViewRootImpl.<init>(ViewRootImpl.java:383)
    01-31 10:41:43.966: E/WindowManager(9038):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:279)
    01-31 10:41:43.966: E/WindowManager(9038):  at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:215)
  01-31 10:41:43.966: E/WindowManager(9038):    at android.view.WindowManagerImpl$CompatModeWrapper.addView(WindowManagerImpl.java:140)
    01-31 10:41:43.966: E/WindowManager(9038):  at android.view.Window$LocalWindowManager.addView(Window.java:537)
     01-31 10:41:43.966: E/WindowManager(9038):     at android.app.Dialog.show(Dialog.java:278)
   01-31 10:41:43.966: E/WindowManager(9038):   at android.app.ProgressDialog.show(ProgressDialog.java:116)
    01-31 10:41:43.966: E/WindowManager(9038):  at android.app.ProgressDialog.show(ProgressDialog.java:104)
     01-31 10:41:43.966: E/WindowManager(9038):     at com.example.collegesoft.MainPage$CountDownTask.onPreExecute(MainPage.java:278)
     01-31 10:41:43.966: E/WindowManager(9038):     at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:561)
    01-31 10:41:43.966: E/WindowManager(9038):  at android.os.AsyncTask.execute(AsyncTask.java:511)
   01-31 10:41:43.966: E/WindowManager(9038):   at com.example.collegesoft.MainPage$3$1$1.run(MainPage.java:82)
       01-31 10:41:43.966: E/WindowManager(9038):   at android.os.Handler.handleCallback(Handler.java:605)
       01-31 10:41:43.966: E/WindowManager(9038):   at android.os.Handler.dispatchMessage(Handler.java:92)
    01-31 10:41:43.966: E/WindowManager(9038):  at android.os.Looper.loop(Looper.java:137)
      01-31 10:41:43.966: E/WindowManager(9038):    at android.app.ActivityThread.main(ActivityThread.java:4514)
   01-31 10:41:43.966: E/WindowManager(9038):   at java.lang.reflect.Method.invokeNative(Native Method)
   01-31 10:41:43.966: E/WindowManager(9038):   at java.lang.reflect.Method.invoke(Method.java:511)
  01-31 10:41:43.966: E/WindowManager(9038):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:790)
   01-31 10:41:43.966: E/WindowManager(9038):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
     01-31 10:41:43.966: E/WindowManager(9038):     at dalvik.system.NativeStart.main(Native Method)

私の call() メソッド ....

protected void call() {
    Log.d(TAG,"Call Called");
    myDbHelper = new DatabaseHelper(MainPage.this);

    try {

        myDbHelper.openDataBase();

    } catch (SQLException sqle) {

        throw sqle;

    }

    Cursor c = myDbHelper.getAllStudentFromMainTable();

    Log.d(TAG, "Cursor : " + c.getColumnCount());

    //new CountDownTask().execute();
    new SyncData().sendJson(c, myDbHelper, MainPage.this);

    //c.close();

}
4

3 に答える 3

1

アクティビティでハンドラーを作成し、それを使用して必要なことを投稿できます。

例：

public void onAvatarChange(View v) {
   final Handler uiHandler = new Handler();

   //Build dialog....
   OnclickListener onYes = new OnClickListener {
       public void onClick(View v) {
            uiHanlder.post(new Runnable() {
                 public void run() {
                     //Do whatever you want here...
                     //You will have looper.prepare here, as it will run on main thread as soon as possible.
                 }
            }
       }
   }

}
于 2013-01-31T10:26:59.527 に答える
0 
runOnUiThread(new Runnable() {
        @Override
        public void run() {

            // start your asynch task here

        }
    });
于 2013-01-31T10:36:25.517 に答える
0

これはどのように可能ですか？

new CountDownTask().execute();

MainPage.this.finish();
Intent i = new Intent("com.example.collegesoft.MainPage");                                              
startActivity(i);

つまり、ある時点で AsyncTask を実行していて、同時に新しいアクティビティを開始しているということです。CountDownTask 内に ProgressDialog を表示したからといって、エラーが発生します。

解決：

代わりに、CountDownTask() の onPostExecute() メソッド内に startActivity() コードを含めることをお勧めします。

protected void onPostExecute(Void result) {
  progressDialog.dismiss();

  MainPage.this.finish();
  Intent i = new Intent("com.example.collegesoft.MainPage");                                              
  startActivity(i);

}
于 2013-01-31T10:30:56.777 に答える