我无法处理接口回调

Question

我有两个TextView。每个人都有一个听众。按下时会打开MyDatePicer extends DialogFragment implements DatePickerDialog.OnDateSetListener。选择日期后，它将设置为所需的TextView。我将TextView作为参数传递给构造函数。我需要改变它。我被建议使用接口回调将结果发送到调用活动。但我无法弄明白。如何确定TextView粘贴文本的内容？ 请帮我解释一下我的例子。

我的代码：

case R.id.dateBegin:
        dateDialog = new MyDatePicer(dateBegin);
        dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
        break;
case R.id.dateEnd:
        dateDialog = new MyDatePicer(dateEnd);
        dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
        break;

和

public class MyDatePicer extends DialogFragment implements DatePickerDialog.OnDateSetListener {
    private TextView tv;

    public MyDatePicer(TextView tv) {
        this.tv = tv;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

    }

    @Override
    public void onStart() {

    }

    @Override
    public void onDateSet(android.widget.DatePicker datePicker, int year,int month, int day) {
        tv.setText(day + "-" + (month + 1) + "-" + year);
    }
}

我尝试了示例How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class? 但无法申请其代码。如何确定TextView插入结果的内容。我倾向于创建两个类MyDatePicer。 可以展示我的例子如何实现它？

完整课程：

public class EstimatedLoad extends Fragment implements View.OnClickListener {
    private TextView dateBegin;
    private TextView dateEnd;
    private TableLayout holidayTable;
    private TableLayout cityayTable;
    private TextView cityHeader;
    private TextView holidayHeader;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.estimated_load, null);
        dateBegin = (TextView) v.findViewById(R.id.dateBegin);
        dateEnd = (TextView) v.findViewById(R.id.dateEnd);
        dateBegin.setOnClickListener(this);
        dateEnd.setOnClickListener(this);
        Button load = (Button) v.findViewById(R.id.btnLoadDate);
        load.setOnClickListener(this);
        holidayTable = (TableLayout) v.findViewById(R.id.hhtable);
        cityayTable = (TableLayout) v.findViewById(R.id.chtable);

        holidayHeader = (TextView) v.findViewById(R.id.hhHeaderLoad);
        cityHeader = (TextView) v.findViewById(R.id.chHeaderLoad);
        holidayHeader.setVisibility(View.INVISIBLE);
        cityHeader.setVisibility(View.INVISIBLE);

        Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);
        dateBegin.setText(year + "-" + (month + 1) + "-" + day);
        dateEnd.setText(year + "-" + (month + 1) + "-" + c.getActualMaximum(Calendar.DAY_OF_MONTH));
        return v;
    }

    @Override
    public void onClick(View v) {
        DialogFragment dateDialog;
        switch (v.getId()){
            case R.id.dateBegin:
                dateDialog = new MyDatePicer(dateBegin);
                dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
                break;
            case R.id.dateEnd:
                dateDialog = new MyDatePicer(dateEnd);
                dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
                break;
            case R.id.btnLoadDate:
                if (InternetResiver.isOnline(getActivity())) {
                    clearTable(holidayTable);
                    clearTable(cityayTable);
                    holidayHeader.setVisibility(View.VISIBLE);
                    cityHeader.setVisibility(View.VISIBLE);
                    setData();                } else {
                    AlertDialog alert = InternetResiver.getAlertDialog(getActivity());
                    alert.show();
                }
                break;
        }
    }

    private void clearTable(TableLayout table) {
        int count = table.getChildCount();
        for (int i = 0; i < count; i++) {
            View child = table.getChildAt(i);
            if (child instanceof TableRow) ((ViewGroup) child).removeAllViews();
        }
    }

    public void setData(){
        new MyAsincTask(getActivity()){
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
            }

            @Override
            protected void onPostExecute(Document document) {
                super.onPostExecute(document);
                ArrayList<EstimatedLoadBean> estimatedLoadBeansHH = new ArrayList<>();
                ArrayList<EstimatedLoadBean> estimatedLoadBeansCH = new ArrayList<>();

                Elements documentHH = document.select("holiday");
                Elements eNameHH = documentHH.select("name");
                Elements eValueHH = documentHH.select("value");

                for (int i = 0; i < eNameHH.size(); i++) {
                    EstimatedLoadBean estimatedLoadBeanHH = new EstimatedLoadBean();
                    estimatedLoadBeanHH.setName(eNameHH.get(i).ownText());
                    estimatedLoadBeanHH.setValue(eValueHH.get(i).ownText());
                    estimatedLoadBeansHH.add(estimatedLoadBeanHH);
                }


                Elements documentCH = document.select("city");
                Elements eNameCH = documentCH.select("name");
                Elements eValueCH = documentCH.select("value");

                for (int i = 0; i < eNameCH.size(); i++) {
                    EstimatedLoadBean estimatedLoadBeanCH = new EstimatedLoadBean();
                    estimatedLoadBeanCH.setName(eNameCH.get(i).ownText());
                    estimatedLoadBeanCH.setValue(eValueCH.get(i).ownText());
                    estimatedLoadBeansCH.add(estimatedLoadBeanCH);
                }

                TableRow.LayoutParams row_params = new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT, 0.1f);

                for (EstimatedLoadBean hhbean : estimatedLoadBeansHH) {
                    TableRow tableRow = getTableRowData(row_params, hhbean);
                    holidayTable.addView(tableRow);
                }

                for (EstimatedLoadBean chbean : estimatedLoadBeansCH) {
                    TableRow tableRow = getTableRowData(row_params, chbean);
                    cityayTable.addView(tableRow);
                }


            }
        }.execute("......key=kitkat&type=xml&tel=0555555555&action=tell_me_about_occupation&date_start="+dateBegin.getText()+"&date_end="+dateEnd.getText()+"");
    }

    private TableRow getTableRowData(TableRow.LayoutParams row_params, EstimatedLoadBean bean) {
        TableRow tableRow = new TableRow(getActivity());
        TextView name = new TextView(getActivity());
        TextView value = new TextView(getActivity());
        name.setTextColor(Color.BLACK);
        value.setTextColor(Color.BLACK);


        name.setText(bean.getName());
        value.setText(bean.getValue());

        Typeface type= Fonts.getSubHeaderFont(getActivity());
        name.setTypeface(type);
        value.setTypeface(type);

        name.setPadding(5,0,0,0);

        tableRow.addView(name, row_params);
        tableRow.addView(value, row_params);
        return tableRow;
    }
}

Answer 1

在日期选择器类中，您希望实现一个简单的界面。

 public class MyDatePicer extends DialogFragment implements DatePickerDialog.OnDateSetListener {
      Bundle bundle;
      String myString
    // Interface
    MyDatePicerListener mListener;

    public interface MyDatePicerListener {
        public abstract void setDateBegin(String log);
        public abstract void setDateEnd(String log);
    }


    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {

    }

    // This is he missing component 
    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            mListener = (MyDatePicerListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement Listener");
        }
    }
    @Override
    public void onStart() {
    bundle = this.getArguments();
    myString = bundle.getString("date", "");
    }

    @Override
    public void onDateSet(android.widget.DatePicker datePicker, int year,int month, int day) {
   @Override
    public void onDateSet(android.widget.DatePicker datePicker, int year,int month, int day) {
    if (myString.equals("start")){
        mListener.setDateStart(day + "-" + (month + 1) + "-" + year);
    }
    if (myString.equals("end")){
        mListener.setDateEnd(day + "-" + (month + 1) + "-" + year);
    }
    }
}

在带有textViwew的活动中

public class EstimatedLoad extends Fragment implements View.OnClickListener, MyDatePicker.MyDatePickerListener {
    private TextView dateBegin;
    private TextView dateEnd;
    private TableLayout holidayTable;
    private TableLayout cityayTable;
    private TextView cityHeader;
    private TextView holidayHeader;
   // DatePickerFragment  fragment;
    Bundle bundle;
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.estimated_load, null);
        dateBegin = (TextView) v.findViewById(R.id.dateBegin);
        dateEnd = (TextView) v.findViewById(R.id.dateEnd);
        fragment = new DatePickerFragment();
        bundle = new Bundle();
        return v;
    }
          @Override
    public void onClick(View v) {
    DialogFragment dateDialog;
    switch (v.getId()){
        case R.id.dateBegin:
            dateDialog = new MyDatePicer(dateBegin);
            bundle.putString("date", "start");
            //dateDialog.setArguments(bundle);
            dateDialog.setArguments(bundle);
            dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
            break;
        case R.id.dateEnd:
            dateDialog = new MyDatePicer(dateEnd);
            bundle.putString("date", "end");
           // fragment.setArguments(bundle);
            dateDialog.setArguments(bundle);
            dateDialog.show(getActivity().getSupportFragmentManager(), "datePicker");
            break;
        case R.id.btnLoadDate:
            if (InternetResiver.isOnline(getActivity())) {
                clearTable(holidayTable);
                clearTable(cityayTable);
                holidayHeader.setVisibility(View.VISIBLE);
                cityHeader.setVisibility(View.VISIBLE);
                setData();                } else {
                AlertDialog alert = InternetResiver.getAlertDialog(getActivity());
                alert.show();
            }
            break;
    }
}

    @Override
    public void setDateBegin(String log) {
        // example
        dateBegin.setText(log);
    }
    @Override
    public void setDateEnd(String log) {
        // example
        dateEnd.setText(log);
    }