Android：Callback AsyncTask to Fragment（アクティビティではない）

Question

私はAsyncTaskとFragmentの間でコールバックを実装しようとしていますが、どのように正しい情報を見つけることができません。問題は、すべてのコールバック実装がアクティビティとasynctaskの間にあることですが、私はフラグメントとasynctaskの間に必要です。誰かが、私に活動なしでそれを実装する方法を小さな実例として教えてもらえますか？ 私のアクション構造：フラグメントコールDialogFragment - >何かを選択し、サーバ要求をasyncタスク - > asyncタスクのすべてに送信し、ビューといくつかの変数を更新します。私の主な問題は、prepareData（）をonCreateで一度だけ呼び出すことで、他のフラグメントと歩き回って戻るときに戻ると古いデータが表示されることです。つまり、asynctaskのonPostのビューのみを更新するには十分ではありません。変数全体を更新するコールバックを持つと良いでしょう。

public class TermsAndConditionsFragment extends SherlockFragment implements OnClickListener, OnTouchListener, OnItemClickListener, onTaskListener { 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    fm = getSherlockActivity().getSupportFragmentManager(); 


    prepareData(); 
} 

public void prepareData() { 
    termsAndConditionsM = new TermsAndConditionsManager(getSherlockActivity()); 
    termsAndConditions = termsAndConditionsM.getTermsAndConditions(); 

    if (termsAndConditions != null) { 
       int totalPayments = Integer.valueOf(termsAndConditions.get(ServerAPI.NO_OF_PAYMENTS)); 
     if (totalPayments > 0) { 
      paymentsData = termsAndConditionsM.getpayments(); 

      if (paymentsData != null) { 

       payments = new ArrayList<Payment>(); 

       for (int i = 1; i <= totalPayments; i++) { 
        paymentValues = new Payment(); 
        paymentValues.setPaymentID(Integer.valueOf(paymentsData.get(ServerAPI.PAYMENT_NO + "_" + i))); 
        paymentValues.setPaymentDate(paymentsData.get(ServerAPI.PAYMENT_DATE + "_" + i)); 
        paymentValues.setPaymentTotalAmount(paymentsData.get(ServerAPI.PAYMENT_TOTAL + "_" + i)); 
        payments.add(paymentValues); 
       } 
      } 
     } 
    } 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    rootView = init(inflater, container); 

    if (payments != null || termsAndConditions != null) 
     updateTermsAndConditionsView(); 

    return rootView; 
} 

private View init(LayoutInflater inflater, ViewGroup container) { 
    rootView = inflater.inflate(R.layout.fragment_terms_and_conditions, container, false); 

    ... 
    return rootView; 
} 

public void updateTermsAndConditionsView() { 
    etHowMuch.setText("£" + termsAndConditions.get(ServerAPI.AMOUNT_OF_CREDIT)); 
    etForHowLong.setText(Helpers.ConvertDays2Date(Integer.valueOf(termsAndConditions.get(ServerAPI.TERM_OF_AGREEMENT_IN_DAYS)))); 

    PaymentAdapter adapter = new PaymentAdapter(getSherlockActivity(), R.layout.custom_loan_item, payments); 
    lvPayments.setAdapter(adapter); 

    tvNoOfPayments.setText(termsAndConditions.get(ServerAPI.NO_OF_PAYMENTS)); 
    tvFirstPayment.setText(termsAndConditions.get(ServerAPI.FIRST_PAYMENT_DATE)); 
    tvTotalRepayable.setText("£" + termsAndConditions.get(ServerAPI.TOTAL_REPAYABLE)); 
} 

@Override 
public void onClick(View v) { 
    ft = fm.beginTransaction(); 

    howMuch = etHowMuch.getText().toString(); 
    forHowLong = etForHowLong.getText().toString(); 

    switch (v.getId()) { 
     case R.id.etHowMuch: 
      f = new NumberPaymentsPickerFragment(); 
      args = new Bundle(); 
      args.putInt(Const.HOW_MUCH, Integer.valueOf(howMuch.replace("£", ""))); 
      args.putDouble(ServerAPI.PAYMENT_STEP, Const.PAYMENT_STEP); 
      args.putString(Const.STATE, ServerAPI.TERMS_AND_CONDITIONS); 
      f.setArguments(args); 
      f.setTargetFragment(this, DIALOG_FRAGMENT); 
      f.show(getActivity().getSupportFragmentManager(), Const.HOW_MUCH); 
      break; 
     case R.id.etForHowLong: 
      f = new NumberPaymentsPickerFragment(); 
      args = new Bundle(); 
      args.putInt(Const.FOR_HOW_LONG, Integer.valueOf(Helpers.ConvertDate2Days(forHowLong))); 
      args.putDouble(ServerAPI.PAYMENT_STEP, Const.PAYMENT_STEP); 
      args.putString(Const.STATE, ServerAPI.TERMS_AND_CONDITIONS); 
      f.setArguments(args); 
      f.setTargetFragment(this, DIALOG_FRAGMENT); 
      f.show(getActivity().getSupportFragmentManager(), Const.FOR_HOW_LONG); 
      break; 
     case R.id.tvPersonalDetails: 
      sfm.saveCurFragment(ServerAPI.PERSONAL_DETAILS, 0); 
      ft.replace(android.R.id.content, new PersonalDetailsFragment(), ServerAPI.PERSONAL_DETAILS).addToBackStack(null).commit(); 
      break; 
     case R.id.tvAgreementDetails: 
      sfm.saveCurFragment(ServerAPI.AGREEMENT_DETAILS, 0); 
      ft.replace(android.R.id.content, new AgreementDetailsFragment(), ServerAPI.AGREEMENT_DETAILS).addToBackStack(null).commit(); 
      break; 
     case R.id.bApply: 

      break; 
    } 

@Override 
public void onUpdateData() { 
    Log.d(TAG, "Update data"); 

} 

} 

DialogFragment：

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    Bundle args = getArguments(); 

    ... 
} 

public Dialog onCreateDialog(Bundle savedInstanceState) { 

    ... 

     return createDialog(v, R.string.for_how_long, etHowMuch, etForHowLong, etPromotionCode); 
    } 
    return null; 
} 
private Dialog createDialog(View view, int titleResID, final EditText howMuchField, final EditText forHowLongField, final EditText promotionCodeField) { 
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 
    builder.setTitle(titleResID); 
    builder.setView(view); 
    builder.setPositiveButton(R.string.set, new DialogInterface.OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int id) { 

      doShowProgress(); 

     } 

     private void doShowProgress() { 


      ExecuteServerTaskBackground task = new 
        ExecuteServerTaskBackground(getActivity()); 
       task.action = ServerAPI.GET_TERMS_AND_CONDITIONS; 
       onTaskListener listener = new onTaskListener() { 

       @Override 
       public void onUpdateData() { 
        Log.d(TAG, "Updaaate"); 

       } 
      }; 
      task.setListener(listener); 
      task.args = args; 
      task.execute(); 
     } 

    }).setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() { 
     @Override 
     public void onClick(DialogInterface dialog, int id) { 
      dialog.cancel(); 
     } 
    }); 
    return builder.create(); 
} 

AsyncTask：

onTaskListener mListener; 

public interface onTaskListener { 
    void onUpdateData(); 
} 

public void setListener(onTaskListener listener){ 
    mListener = listener; 
} 
public ExecuteServerTaskBackground(Activity activity) { 
    this.mActivity = activity; 
    this.mContext = activity.getApplicationContext(); 
} 

@Override 
protected void onPreExecute() { 
    pb = (ProgressBar) mActivity.findViewById(R.id.progressBar1); 
    pb.setVisibility(View.VISIBLE); 
} 

@Override 
protected Void doInBackground(Void... params) { 
    ServerAPI server = new ServerAPI(mContext); 
    if (!args.isEmpty()) 
     server.serverRequest(action, args); 
    else 
     server.serverRequest(action, null); 
    return null; 
} 

@Override 
protected void onPostExecute(Void result) { 
mListener.onUpdateData(); 

//There is I just update view but how to update whole variables throughtout callback?   
//    tvNoOfPayments = (TextView) mActivity.findViewById(R.id.tvNoOfPaymentsValue); 
//    tvFirstPayment = (TextView) mActivity.findViewById(R.id.tvFirstPaymentValue); 
//    tvTotalRepayable = (TextView) mActivity.findViewById(R.id.tvTotalRepayableValue); 
// 
//    lvPayments = (ListView) mActivity.findViewById(R.id.lvData); 
// 
//    termsConditionsM = new TermsAndConditionsManager(mContext); 
// 
//    termsAndConditions = termsConditionsM.getTermsAndConditions(); 
// 
//    int totalPayments = Integer.valueOf(termsAndConditions.get(ServerAPI.NO_OF_PAYMENTS)); 
// 
//    if (totalPayments > 0) { 
//     if (termsAndConditions != null) { 
//      tvNoOfPayments.setText(termsAndConditions.get(ServerAPI.NO_OF_PAYMENTS)); 
//      tvFirstPayment.setText(termsAndConditions.get(ServerAPI.FIRST_PAYMENT_DATE)); 
//      tvTotalRepayable.setText("£" + termsAndConditions.get(ServerAPI.TOTAL_REPAYABLE)); 
//     } 
// 
//     paymentsData = termsConditionsM.getpayments(); 
// 
//     if (paymentsData != null) { 
//      Log.d(TAG, paymentsData.toString()); 
// 
//      payments = new ArrayList<Payment>(); 
// 
//      for (int i = 1; i <= totalPayments; i++) { 
//       paymentValues = new Payment(); 
//       paymentValues.setPaymentID(Integer.valueOf(paymentsData.get(ServerAPI.PAYMENT_NO + "_" + i))); 
//       paymentValues.setPaymentDate(paymentsData.get(ServerAPI.PAYMENT_DATE + "_" + i)); 
//       paymentValues.setPaymentTotalAmount(paymentsData.get(ServerAPI.PAYMENT_TOTAL + "_" + i)); 
//       payments.add(paymentValues); 
//      } 
// 
//      PaymentAdapter adapter = new PaymentAdapter(mContext, R.layout.custom_loan_item, payments); 
//      lvPayments.setAdapter(adapter); 
//     } 
    //    

    } 

    pb.setVisibility(View.GONE); 
    super.onPostExecute(result); 
} 

Answer 1

考慮して、あなたのコードを取らずに、私は、機能コールバックを行うために最も重要なを掲載します。

---

TestFragment：

public class TestFragment extends Fragment { 

    /* Skipping most code and I will only show you the most essential. */  
    private void methodThatStartsTheAsyncTask() { 
     TestAsyncTask testAsyncTask = new TestAsyncTask(new FragmentCallback() { 

      @Override 
      public void onTaskDone() { 
       methodThatDoesSomethingWhenTaskIsDone(); 
      } 
     }); 

     testAsyncTask.execute(); 
    } 

    private void methodThatDoesSomethingWhenTaskIsDone() { 
     /* Magic! */ 
    } 

    public interface FragmentCallback { 
     public void onTaskDone(); 
    } 
} 

---

TestAsyncTask：私が今持っているものである

public class TestAsyncTask extends AsyncTask<Void, Void, Void> { 
    private FragmentCallback mFragmentCallback; 

    public TestAsyncTask(FragmentCallback fragmentCallback) { 
     mFragmentCallback = fragmentCallback; 
    } 

    @Override 
    protected Void doInBackground(Void... params) { 
     /* Do your thing. */ 
     return null; 
    } 

    @Override 
    protected void onPostExecute(Void result) { 
     mFragmentCallback.onTaskDone(); 
    } 
}