如何創建一個單獨的時間選擇器類

Question

我創建了時間選擇器。但是在我的項目中，我需要在EditText字段中插入四個時間選擇器。當點擊EditText時，它會提示theililog設置時間。它很長，以便在Activity類中創建時間選擇器。所以我想創建一個單獨的時間選擇器類。我創建了TimePickerClass，但它顯示錯誤。 請幫幫我。

package com.sample.uiscreen; 

import android.app.Dialog; 
import android.app.TimePickerDialog; 
import android.view.View; 
import android.widget.EditText; 
import android.widget.TimePicker; 


public class TimePickClass { 


    private int mHour; 
    private int mMinute; 
    EditText time; 
    public static final int TIME_DIALOG_ID = 0; 
    MyActivity ma=null; 




// the callback received when the user "sets" the time in the dialog 
    public TimePickerDialog.OnTimeSetListener mTimeSetListener =  
        new TimePickerDialog.OnTimeSetListener() { 
     public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
      mHour = hourOfDay; 
      mMinute = minute; 
      time.setText(  
        new StringBuilder() 
        .append(pad(mHour)).append(":") 
        .append(pad(mMinute)));} 
    //pad method 
     private String pad(int c) { 
      if (c >= 10) 
       return String.valueOf(c); 
      else  return "0" + String.valueOf(c);  } }; 

      protected Dialog onCreateDialog(int id) { 
       switch (id) {  
       case TIME_DIALOG_ID:   
      return new TimePickerDialog(ma, 
        mTimeSetListener, mHour, mMinute, true); }  
       return null; } 





} 

Answer 1

我的代碼如下

protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     // capture our View elements 
     settime1 = (EditText) findViewById(R.id.time1); 
     // add a click listener to the EditText 
     settime1.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       showDialog(TIME_ID1);   }  }); 

    settime2 = (EditText) findViewById(R.id.time2); 
    settime2.setOnClickListener(new View.OnClickListener() { 
     public void onClick(View v) { 
      showDialog(TIME_ID2);   }  }); 

     } 

// the callback received when the user "sets" the time in the dialogprivate 
    TimePickerDialog.OnTimeSetListener mTimeSetListener =  
     new TimePickerDialog.OnTimeSetListener() { 
     public void onTimeSet(TimePicker view, int hourOfDay, int minute) { 
      mHour = hourOfDay; 
      mMinute = minute; 
      updateDisplay();  } }; 

      // updates the time we display in the 
      private void updateDisplay() { 
       settime1.setText(  
         new StringBuilder() 
         .append(pad(mHour)) 
         .append(":") 
         .append(pad(mMinute)));} 
      private static String pad(int c) { if (c >= 10)   
       return String.valueOf(c);  
      else  return "0" + String.valueOf(c);} 


        protected Dialog onCreateDialog(int id) { 
         switch (id) { 
         case TIME_ID1: 
          return new TimePickerDialog(this, 
            mTimeSetListener, mHour, mMinute, true); 
         case TIME_ID2: 
          return new TimePickerDialog(this, 
            mTimeSetListener, mHour, mMinute, true);} 
         return null;}