android闹钟（四）：实现计时器

TimerView.java
package com.mytest.myclock;import java.util.Timer;import java.util.TimerTask;import android.app.AlertDialog;import android.content.Context;import android.os.Handler;import android.util.AttributeSet;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.LinearLayout;import android.widget.TextView;public class TimerView extends LinearLayout {    public TimerView(Context context) {        super(context);        // TODO Auto-generated constructor stub    }    public TimerView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        // TODO Auto-generated constructor stub    }    public TimerView(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub    }    private TextView tvHour;    private TextView tvMinute;    private TextView tvSecond;    private Button btnStart;    private Button btnStop;    @Override    protected void onFinishInflate() {        // TODO Auto-generated method stub        super.onFinishInflate();        init();    }    private void init() {        tvHour = (TextView) this.findViewById(R.id.timer_hour);        tvMinute = (TextView) this.findViewById(R.id.timer_mini);        tvSecond = (TextView) this.findViewById(R.id.timer_second);        btnStart = (Button) this.findViewById(R.id.btn_start_timer);        btnStop = (Button) this.findViewById(R.id.btn_stop_timer);        btnStop.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                stopTimer();            }        });        btnStart.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                startTimer();            }        });    }    private final int WORK_STATE_STOP = 0; // 计时状态，停止    private final int WORK_STATE_RUN = 1;// 计时状态    private int userInputTime = 0;    private Timer timer;    private TimerTask task;    private Handler handler = new Handler() {        public void handleMessage(android.os.Message msg) {            switch(msg.what){            case WORK_STATE_RUN:                int hour =  userInputTime/60/60;                int minute = (userInputTime/60)%60;                int second = userInputTime%60;                tvHour.setText(""+hour);                tvMinute.setText(""+minute);                tvSecond.setText(""+second);                break;            case WORK_STATE_STOP:                new AlertDialog.Builder(getContext()).setTitle("时间到").setNegativeButton("取消", null).show();                stopTimer();                break;            }        };    };    private void startTimer() {        try {            userInputTime = (Integer.parseInt(tvHour.getText().toString()) * 60 * 60                    + Integer.parseInt(tvMinute.getText().toString()) * 60                    + Integer.parseInt(tvSecond.getText().toString()));        } catch (Exception e) {            Log.e("info", "TimerView->startTimer"+ e.getMessage());            return;        }                        timer = new Timer();        task = new TimerTask() {                        @Override            public void run() {                                userInputTime--;                handler.sendEmptyMessage(WORK_STATE_RUN);                if(userInputTime <=0){                    handler.sendEmptyMessage(WORK_STATE_STOP);                    stopTimer();                }                            }        };        timer.schedule(task, 1000,1000); //延迟一秒，再每隔一秒执行一次timertask.run()    }    private void stopTimer() {        if(task!=null){            task.cancel();            task = null;        }    }}
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小结：
1、采用timer和timertask去刷新时间；
2、获取小时数应该采用hour = userInputTime/60/60，而不能直接hour = userInputTime/360.
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