<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center_horizontal"    android:orientation="vertical" >	<LinearLayout 	    android:layout_width="wrap_content"	    android:layout_height="wrap_content"	    android:orientation="horizontal"	    android:gravity="center_horizontal"	    android:paddingLeft="3dp" >	    		<NumberPicker 		android:id="@+id/np1"	    android:layout_width="50dp"	    android:layout_height="wrap_content"/>			<TextView 	    android:layout_width="wrap_content"	    android:layout_height="wrap_content"	    android:layout_gravity="center_vertical|center_horizontal"	    android:textSize="20sp"	    android:text=":"/>		<NumberPicker 		android:id="@+id/np2"	    android:layout_width="50dp"	    android:layout_height="wrap_content"	    android:layout_marginLeft="5dip"/>		<TextView 	    android:layout_width="wrap_content"	    android:layout_height="wrap_content"	    android:layout_gravity="center_vertical|center_horizontal"	    android:textSize="20sp"	    android:text=":"/>		<NumberPicker 		android:id="@+id/np3"	    android:layout_width="50dp"	    android:layout_height="wrap_content"/>	</LinearLayout>			<TextView 	    android:id="@+id/txt"	    android:layout_width="fill_parent"	    android:layout_height="wrap_content"/>		   <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <TextView            android:id="@+id/showtiqian"            android:layout_width="fill_parent"            android:layout_height="wrap_content" />    </LinearLayout>		    	 <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <Button            android:id="@+id/btn_start"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="开始倒计时" />        <Button            android:id="@+id/button1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:text="停止" />        <TextView            android:id="@+id/showcount"            android:layout_width="fill_parent"            android:layout_height="wrap_content" />    </LinearLayout></LinearLayout>

package com.example.activity;import java.util.Calendar;import android.annotation.SuppressLint;import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.NumberPicker;import android.widget.NumberPicker.OnValueChangeListener;import android.widget.TextView;import com.example.test.R;public class TimeCountActivity extends Activity{    private boolean STOP = true;	private NumberPicker mSecondSpinner;	private NumberPicker mHourSpinner;	private NumberPicker mMinuteSpinner;	private TextView timeCount;	private Button btn_start ,btn1;	private Calendar mDate;	private int mHour, mMinute,mSecond;	private Handler mHandler = new Handler();// 全局handler	int time = 0;// 时间差			@SuppressLint("NewApi")	protected void onCreate(Bundle savedInstanceState)	{		setContentView(R.layout.timecount);		super.onCreate(savedInstanceState);		mDate = Calendar.getInstance();		mHour = mDate.get(Calendar.HOUR_OF_DAY);		mMinute = mDate.get(Calendar.MINUTE);		mSecond = mDate.get(Calendar.SECOND);		mHourSpinner = (NumberPicker) this.findViewById(R.id.np1);		mHourSpinner.setMaxValue(23);		mHourSpinner.setMinValue(0);		mHourSpinner.setValue(mHour);		mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);		mMinuteSpinner = (NumberPicker) this.findViewById(R.id.np2);		mMinuteSpinner.setMaxValue(59);		mMinuteSpinner.setMinValue(0);		mMinuteSpinner.setValue(mMinute);		mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);				mSecondSpinner = (NumberPicker) this.findViewById(R.id.np3);		mSecondSpinner.setMaxValue(59);		mSecondSpinner.setMinValue(0);		mSecondSpinner.setValue(mSecond);		mSecondSpinner.setOnValueChangedListener(mOnDateChangedListener);				timeCount = (TextView) this.findViewById(R.id.showcount);				btn_start = (Button) this.findViewById(R.id.btn_start);		btn_start.setOnClickListener(new mClick());				btn1 = (Button) this.findViewById(R.id.button1);		btn1.setOnClickListener(new mClick());	}		class mClick implements OnClickListener	{		public void onClick(View v)		{			if(v == btn_start)			{				STOP = false;				  time = mSecond + mMinute*60 + mHour*3600;				  new Thread(new TimeCount()).start();// 开启线程			}			else if(v == btn1)			{				STOP = true;			}		}	}	@SuppressLint("NewApi")	private NumberPicker.OnValueChangeListener mOnDateChangedListener = new OnValueChangeListener()	{				@SuppressLint("NewApi")		public void onValueChange(NumberPicker picker, int oldVal, int newVal)		{			mSecond = mHourSpinner.getValue();		}	};	@SuppressLint("NewApi")	private NumberPicker.OnValueChangeListener mOnHourChangedListener = new OnValueChangeListener()	{				@SuppressLint("NewApi")		public void onValueChange(NumberPicker picker, int oldVal, int newVal)		{			mHour = mHourSpinner.getValue();		}	};	@SuppressLint("NewApi")	private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new OnValueChangeListener()	{				@SuppressLint("NewApi")		public void onValueChange(NumberPicker picker, int oldVal, int newVal)		{			mMinute = mMinuteSpinner.getValue();		} 	};	class TimeCount implements Runnable	{		@Override		public void run()		{			while ( !STOP && time > 0)// 整个倒计时执行的循环			{				time--;				mHandler.post(new Runnable() // 通过它在UI主线程中修改显示的剩余时间				{					public void run()					{						timeCount.setText(getInterval(time));// 显示剩余时间					}				});				try				{					Thread.sleep(1000);// 线程休眠一秒钟 这个就是倒计时的间隔时间				} catch (InterruptedException e)				{					e.printStackTrace();				}			}			// 下面是倒计时结束逻辑			mHandler.post(new Runnable()			{				@Override				public void run()				{					timeCount.setText("设定的时间到。");				}			});		}	}  /**	 * 设定显示文字	 */	public static String getInterval(int time)	{		String txt = null;		if (time >= 0)		{			long hour = time % (24 * 3600) / 3600;// 小时			long minute = time % 3600 / 60;// 分钟			long second = time % 60;// 秒						txt =" 距离现在还有：" + hour + "小时" + minute + "分" + second + "秒";		} 		else		{			txt="已过期";		}		return txt;	}}