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仿照墨跡天氣的桌面小插件例子源碼。
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源碼片段

public class UpdateService extends Service { 
    private static final int UPDATE = 0x123; 
    private RemoteViews remoteViews; 
    // 數字時間圖片資源數組 
    private int[] imgs = { R.drawable.n0, R.drawable.n1, R.drawable.n2, 
            R.drawable.n3, R.drawable.n4, R.drawable.n5, R.drawable.n6, 
            R.drawable.n7, R.drawable.n8, R.drawable.n9, }; 
    // 將顯示小時、分鐘的ImageView定義成數組 
    private int[] dateViews = { R.id.h1, R.id.h2, R.id.m1, R.id.m2 }; 
    // 按照中國天氣網的天氣圖片順序排列好本地資源圖片，我這里是隨意的~嘿嘿 
    private int[] weatherImg = { R.drawable.sunny, R.drawable.cloudy, 
            R.drawable.chance_of_rain, R.drawable.chance_of_sleet, 
            R.drawable.chance_of_snow, R.drawable.chance_of_storm, 
            R.drawable.clock1, R.drawable.fog, R.drawable.haze, 
            R.drawable.mist, R.drawable.mostly_sunny, R.drawable.mostly_cloudy, 
            R.drawable.lower, R.drawable.middle }; 
    private Handler handler = new Handler() { 
  
        @Override 
        public void handleMessage(Message msg) { 
            switch (msg.what) { 
            case UPDATE: 
                // 更新天氣 
                updateTime(); 
                updateWeather(); 
                break; 
            } 
        } 
    }; 
    // 廣播接收者去接收系統每分鐘的提示廣播，來更新時間 
    private BroadcastReceiver mTimePickerBroadcast = new BroadcastReceiver() { 
  
        @Override 
        public void onReceive(Context context, Intent intent) { 
            updateTime(); 
        } 
    }; 
  
    private void updateWeather() { 
        // Weather w = new GetWeather().googleWeather(); 
        // if (w != null) { 
        // System.out.println("當前天氣：" + w.getWeather() + ":" + w.getTemp_c() 
        // + ":" + w.getIcon()); 
        remoteViews.setTextViewText(R.id.condition, MyWeather.weather1); 
        remoteViews.setTextViewText(R.id.tem, (MyWeather.temp1)); 
        // 根據圖片名，獲取天氣圖片資源 
        // remoteViews.setImageViewResource( 
        // R.id.weather, 
        // getApplicationContext().getResources().getIdentifier( 
        // w.getIcon(), "drawable", "com.way.apptest")); 
        if (MyWeather.img1 != null || !"".equals(MyWeather.img1)) 
            remoteViews.setImageViewResource(R.id.weather, 
                    weatherImg[Integer.parseInt(MyWeather.img1)]); 
        // 執行更新 
        ComponentName componentName = new ComponentName( 
                getApplicationContext(), App.class); 
        AppWidgetManager.getInstance(getApplicationContext()).updateAppWidget( 
                componentName, remoteViews); 
    } 
  
    @Override 
    public IBinder onBind(Intent intent) { 
        return null; 
    } 
  
    @Override 
    public void onCreate() { 
        super.onCreate(); 
        remoteViews = new RemoteViews(getApplication().getPackageName(), 
                R.layout.main);// 實例化RemoteViews 
        if (isNetworkAvailable()) { 
            MyWeather.getWeather();// json解析中國天氣網天氣 
        } else { 
            toast(); 
        } 
        updateTime();// ***次運行時先更新一下時間和天氣 
        updateWeather(); 
        // 點擊天氣圖片，進入MainActivity 
        Intent intent = new Intent(getApplicationContext(), MainActivity.class); 
        PendingIntent pi = PendingIntent.getActivity(getApplicationContext(), 
                0, intent, 0); 
        remoteViews.setOnClickPendingIntent(R.id.weather, pi); 
  
        // 定義一個定時器去更新天氣。實際開發中更新時間間隔可以由用戶設置， 
        new Timer().scheduleAtFixedRate(new TimerTask() { 
            @Override 
            public void run() { 
                Message msg = handler.obtainMessage(); 
                msg.what = UPDATE; 
                handler.sendMessage(msg); 
            } 
        }, 1, 3600 * 1000);// 每小時更新一次天氣 
    } 
  
    private void updateTime() { 
        Date date = new Date(); 
        // 定義SimpleDateFormat對象 
        SimpleDateFormat df = new SimpleDateFormat("HHmm"); 
        // 將當前時間格式化成HHmm的形式 
        String timeStr = df.format(date); 
  
        for (int i = 0; i < timeStr.length(); i++) { 
            // 將第i個數字字符轉換為對應的數字 
            int num2 = Integer.parseInt(timeStr.substring(i, i + 1)); 
            // 將第i個圖片的設為對應的數字圖片 
            remoteViews.setImageViewResource(dateViews[i], imgs[num2]); 
        } 
        remoteViews.setTextViewText(R.id.city, MyWeather.city); 
        remoteViews.setTextViewText(R.id.date, "0" + (date.getMonth() + 1) 
                + "-" + date.getDate() + " 周" + date.getDay()); 
        ComponentName componentName = new ComponentName(getApplication(), 
                App.class); 
        AppWidgetManager.getInstance(getApplication()).updateAppWidget( 
                componentName, remoteViews); 
    } 
  
    @Override 
    public void onStart(Intent intent, int startId) { 
        // 注冊系統每分鐘提醒廣播（注意：這個廣播只能在代碼中注冊） 
        IntentFilter updateIntent = new IntentFilter(); 
        updateIntent.addAction("android.intent.action.TIME_TICK"); 
        registerReceiver(mTimePickerBroadcast, updateIntent); 
        super.onStart(intent, startId); 
    } 
  
    @Override 
    public void onDestroy() { 
        // 注銷系統的這個廣播 
        unregisterReceiver(mTimePickerBroadcast); 
        //被系統干掉后，服務重啟,做一次流氓軟件,哈哈 
        Intent intent = new Intent(getApplicationContext(), UpdateService.class); 
        getApplication().startService(intent); 
        super.onDestroy(); 
    } 
  
    /** 
     * 判斷手機網絡是否可用 
     * 
     * @param context 
     * @return 
     */ 
    private boolean isNetworkAvailable() { 
        ConnectivityManager mgr = (ConnectivityManager) getApplicationContext() 
                .getSystemService(Context.CONNECTIVITY_SERVICE); 
        NetworkInfo[] info = mgr.getAllNetworkInfo(); 
        if (info != null) { 
            for (int i = 0; i < info.length; i++) { 
                if (info[i].getState() == NetworkInfo.State.CONNECTED) { 
                    return true; 
                } 
            } 
        } 
        return false; 
    } 
  
    private void toast() { 
        new AlertDialog.Builder(getApplicationContext()) 
                .setTitle("提示") 
                .setMessage("網絡連接未打開") 
                .setPositiveButton("前往打開", 
                        new DialogInterface.OnClickListener() { 
  
                            public void onClick(DialogInterface dialog, 
                                    int which) { 
                                Intent intent = new Intent( 
                                        android.provider.Settings.ACTION_WIRELESS_SETTINGS); 
                                startActivity(intent); 
                            } 
                        }).setNegativeButton("取消", null).create().show(); 
    } 

源碼鏈接：http://down.51cto.com/data/1985018