需要幫助來爲Android中的不同時區開發時鐘功能？

Question

我開發了一個採樣時鐘（模擬）應用程序來顯示時間。現在我的應用程序顯示了我手機的當前時間。我想改進它顯示世界時間。不幸的是，我對此沒有太多的瞭解，任何人都可以引導我？

Answer 1

這裏是我用來顯示所有城市時間的代碼。

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="vertical" > 

    <ListView 
     android:id="@android:id/list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" /> 

</LinearLayout> 

TIMEZONE.XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="wrap_content" 
    android:layout_height="?android:attr/listPreferredItemHeight" 
    android:orientation="vertical" > 

    <TextView 
     android:id="@+id/timezone_name" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:textSize="25dip" /> 

    <TextView 
     android:id="@+id/timezone_time" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:textSize="15dip" /> 

</LinearLayout> 

的類文件...

MainActivity.java

package com.practice.secondhand; 
import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.List; 
import java.util.TimeZone; 

import android.app.ListActivity; 
import android.content.Context; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ArrayAdapter; 
import android.widget.TextView; 

public class MainActivity extends ListActivity { 
    protected static final int UPDATE_UI = 0; 

    TimeZoneAdaptor timezoneAdaptor = null; 
    List<TimeZoneData> timezonelist = null; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 

     timezonelist = new ArrayList<TimeZoneData>(); 
     timezoneAdaptor = new TimeZoneAdaptor(this, R.layout.timezoneview, 
       timezonelist); 

     setListAdapter(timezoneAdaptor); 
    } 

    @Override 
    protected void onStart() { 
     super.onStart(); 

     String[] listItems = TimeZone.getAvailableIDs(); 

     TimeZone timezone = null; 
     SimpleDateFormat format = new SimpleDateFormat(
       "EEE, MMM d, yyyy h:mm a"); 
     Date now = new Date(); 

     for (int index = 0; index < listItems.length; ++index) { 
      timezone = TimeZone.getTimeZone(listItems[index]); 

      format.setTimeZone(timezone); 

      timezonelist.add(new TimeZoneData(getDiaplayName(listItems[index]), 
        format.format(now))); 

      timezone = null; 
     } 
    } 

    private String getDiaplayName(String timezonename) { 
     String displayname = timezonename; 
     int sep = timezonename.indexOf('/'); 

     if (-1 != sep) { 
      displayname = timezonename.substring(0, sep) + ", " 
        + timezonename.substring(sep + 1); 
      displayname = displayname.replace("_", " "); 
     } 

     return displayname; 
    } 

    public class TimeZoneAdaptor extends ArrayAdapter<TimeZoneData> { 

     List<TimeZoneData> objects = null; 

     public TimeZoneAdaptor(Context context, int textViewResourceId, 
       List<TimeZoneData> objects) { 
      super(context, textViewResourceId, objects); 

      this.objects = objects; 
     } 

     @Override 
     public int getCount() { 
      return ((null != objects) ? objects.size() : 0); 
     } 

     @Override 
     public TimeZoneData getItem(int position) { 
      return ((null != objects) ? objects.get(position) : null); 
     } 

     @Override 
     public long getItemId(int position) { 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      View view = convertView; 

      if (null == view) { 
       LayoutInflater vi = (LayoutInflater) MainActivity.this 
         .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
       view = vi.inflate(R.layout.timezoneview, null); 
      } 

      TimeZoneData data = objects.get(position); 

      if (null != data) { 
       TextView textName = (TextView) view 
         .findViewById(R.id.timezone_name); 
       TextView textTime = (TextView) view 
         .findViewById(R.id.timezone_time); 

       textName.setText(data.name); 
       textTime.setText(data.time); 
      } 

      return view; 
     } 
    } 
} 

TimeZoneData.java

package com.practice.secondhand; 


public class TimeZoneData { 
     public String name; 
     public String time; 

     public TimeZoneData(String name,String time) { 
       this.name = name; 
       this.time = time; 
     } 
} 

TimeZoneAdaptor的.java

public class TimeZoneAdaptor extends ArrayAdapter<TimeZoneData> { 

    List<TimeZoneData> objects = null; 

    public TimeZoneAdaptor(Context context, int textViewResourceId, 
      List<TimeZoneData> objects) { 
     super(context, textViewResourceId, objects); 

     this.objects = objects; 
    } 

    public int getCount() { 
     return ((null != objects) ? objects.size() : 0); 
    } 

    public TimeZoneData getItem(int position) { 
     return ((null != objects) ? objects.get(position) : null); 
    } 

    public long getItemId(int position) { 
     return position; 
    } 

    public View getView(int position, View convertView, ViewGroup parent) { 
     View view = convertView; 

     if (null == view) { 
      LayoutInflater vi = (LayoutInflater) TimeZonesList.this 
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      view = vi.inflate(R.layout.timezoneview, null); 
     } 

     TimeZoneData data = objects.get(position); 

     if (null != data) { 
      TextView textName = (TextView) view 
        .findViewById(R.id.timezone_name); 
      TextView textTime = (TextView) view 
        .findViewById(R.id.timezone_time); 
      textName.setTextSize(18); 
      textName.setTextColor(Color.GREEN); 
      textName.setText(data.name); 
      textTime.setText(data.time); 
      textTime.setTextSize(15); 

     } 

     return view; 

    } 

} 

Answer 2

您可以撥打java.util.TimeZone.getAvailableIDs獲取所有可用時區的名稱，並getTimeZone實例化每個時區。然後使用TimeZone對象構造一個GregorianCalendar對象。在將其設置爲正確的字段後，您可以調用其getTime方法來獲取Date對象，然後可以使用DateFormat以可顯示的形式進行格式化。

這是所有相當混亂，真的...

Answer 3

以上是除了在的onCreate（）的最後一行

setListAdapter(timezoneAdaptor); 

它大沒有t在任何其他類中，它不在Java或Android庫中。任何人有任何想法如何解決這個問題，因爲代碼不能按原樣編譯？我將繼續努力，如果我找出一些我會更新的東西。

編輯

需與代替延長活性的ListActivity。對於setListAdapter（）方法的Android庫搜索沒有任何結果，這仍然很奇怪。