模拟时钟Message和Handler的简易应用

１，模拟时钟和数字时钟的直接调用

２，用一个ＴｅｘｔＶｉｅｗ显示获取的当前时间

３，修改系统默认的时间格式为２４小时制

package irdc.EX04_14_B;
/** @author Modfiy by jake20001@126.com * */import android.app.Activity;
import android.content.ContentResolver;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Bundle; /*这里我们需要使用Handler类别与Message类别来处理线程*/
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.widget.AnalogClock;
import android.widget.DigitalClock;
import android.widget.TextView; /*需要使用Java的Calendar与Thread类别来取得系统时间*/import java.util.Calendar;
import java.lang.Thread;public class EX04_14_B extends Activity
{ /* 宣告一常数作为判别讯息用 */protected static final int GUINOTIFIER = 0x1234; /* 宣告两个widget对象变量 */protected static final String TAG = "EX04_14";private TextView mTextView;public AnalogClock mAnalogClock; /* 宣告与时间相关的变量 */public Calendar mCalendar;public int mMinutes;public int mHour; /* 宣告关键Handler与Thread变量 */public Handler mHandler;private Thread mClockThread;public DigitalClock mDigitalClock;/** Called when the activity is first created. */public void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.main); /* 透过findViewById取得两个widget对象 */mTextView = (TextView) findViewById(R.id.myTextView);mAnalogClock = (AnalogClock) findViewById(R.id.myAnalogClock); /* 透过Handler来接收线程所传递的信息并更新TextView */mDigitalClock = (DigitalClock) findViewById(R.id.myDigitalClock);Resources res = getResources();Configuration conf = res.getConfiguration();ContentResolver cv = this.getContentResolver();String strTimeFormat = android.provider.Settings.System.getString(cv,android.provider.Settings.System.TIME_12_24);if(strTimeFormat.equals("12")){Log.i(TAG,"12");android.provider.Settings.System.putString(cv, android.provider.Settings.System.TIME_12_24, "24");}mHandler = new Handler(){public void handleMessage(Message msg){ /* 这里是处理信息的方法 */switch (msg.what){case EX04_14_B.GUINOTIFIER: /* 在这处理要TextView对象Show时间的事件 */mTextView.setText(mHour + " : " + mMinutes);Log.i(TAG,"2222222222222222");break;}super.handleMessage(msg);}}; /* 透过线程来持续取得系统时间 */mClockThread = new LooperThread();Log.i(TAG,"000000000000000000");mClockThread.start();} /* 改写一个Thread Class用来持续取得系统时间 */class LooperThread extends Thread{public void run(){super.run();try{do{ /* 取得系统时间 */long time = System.currentTimeMillis(); /* 透过Calendar对象来取得小时与分钟 */final Calendar mCalendar = Calendar.getInstance();mCalendar.setTimeInMillis(time);mHour = mCalendar.get(Calendar.HOUR);mMinutes = mCalendar.get(Calendar.MINUTE); /* 让线程休息一秒 */Thread.sleep(1000); /* 重要关键程序:取得时间后发出讯息给Handler */Message m = new Message();m.what = EX04_14_B.GUINOTIFIER;mHandler.sendMessage(m);Log.i(TAG,"11111111111111111");} while (EX04_14_B.LooperThread.interrupted() == false); /* 当系统发出中断讯息时停止本循环 */} catch (Exception e){e.printStackTrace();}}}
}

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