获取系统时间

one step： 通过广播接收系统时间

 private BroadcastReceiver receiver = new BroadcastReceiver() {

  public void onReceive(Context context, Intent intent) {

   // TODO Auto-generated method stub

   String action = intent.getAction();

   if(Intent.ACTION_TIME_CHANGED.equals(action)

     ||Intent.ACTION_TIME_TICK.equals(action)

     ||Intent.ACTION_TIMEZONE_CHANGED.equals(action)){

    if(handler!=null){

     handler.sendEmptyMessage(SYSTEM_TIME);

    }

   }

  }

 };
two step：在handler中显示时间

 timeText.setText(getSystemTime());
three step：获得系统时间的方法

 public String getSystemTime(){

  Calendar c = Calendar.getInstance();

        ContentResolver cv = getContentResolver();

        String strTimeFormat = android.provider.Settings.System.getString(cv,

                                           android.provider.Settings.System.TIME_12_24);

        SimpleDateFormat sdf = new SimpleDateFormat("", Locale.SIMPLIFIED_CHINESE); 

        if("24".equalsIgnoreCase(strTimeFormat)){

          sdf.applyPattern("HH:mm"); 

        }else{

          sdf.applyPattern("hh:mm"); 

        }

     String time = sdf.format(c.getTimeInMillis());

  return time;

 

 }