Android自定义倒计时按钮

package com.dylan.frame.ui;import android.content.Context;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.view.View;import android.widget.Button;import java.util.Timer;import java.util.TimerTask;/** * 自定义倒计时按钮 * <p/> * * @author Dylan *     <p/> *     [佛祖保佑 永无BUG] *     Created by Dylan on 2015/11/5 0005. */public class CountdownButton extends Button implements View.OnClickListener {  private long lenght = 60 * 1000;//默认倒计时时间；  private long time;//倒计时时长  private Timer timer;//开始执行倒计时  private TimerTask timerTask;//每次倒计时执行的任务  private String beforeText = "点击获取验证码";  private String afterText = "秒后重新获取";  private OnClickListener onClickListener;//按钮点击事件  /**   * 更新显示的文本   */  private Handler handler = new Handler() {    @Override    public void handleMessage(Message msg) {      super.handleMessage(msg);      CountdownButton.this.setText(time / 1000 + afterText);      time -= 1000;      if (time < 0) {        CountdownButton.this.setEnabled(true);        CountdownButton.this.setText(beforeText);        clearTimer();      }    }  };  public CountdownButton(Context context) {    super(context);    this.setText(beforeText);    setOnClickListener(this);  }  public CountdownButton(Context context, AttributeSet attrs) {    super(context, attrs);    setOnClickListener(this);  }  public CountdownButton(Context context, AttributeSet attrs, int defStyleAttr) {    super(context, attrs, defStyleAttr);    setOnClickListener(this);  }  /**   * 清除倒计时   */  private void clearTimer() {    if (timerTask != null) {      timerTask.cancel();      timerTask = null;    }    if (timer != null) {      timer.cancel();      timer = null;    }  }  /**   * 设置倒计时时长   *   * @param lenght 默认毫秒   */  public void setLenght(long lenght) {    this.lenght = lenght;  }  /**   * 设置未点击时显示的文字   *   * @param beforeText   */  public void setBeforeText(String beforeText) {    this.beforeText = beforeText;  }  /**   * 设置未点击后显示的文字   *   * @param beforeText   */  public void setAfterText(String afterText) {    this.afterText = afterText;  }  /**   * 点击按钮后的操作   *   * @param v   */  @Override  public void onClick(View v) {    if (onClickListener != null) {      onClickListener.onClick(v);    }    initTimer();    this.setText(time / 1000 + afterText);    this.setEnabled(false);    timer.schedule(timerTask, 0, 1000);  }  /**   * 初始化时间   */  private void initTimer() {    time = lenght;    timer = new Timer();    timerTask = new TimerTask() {      @Override      public void run() {        handler.sendEmptyMessage(1);      }    };  }  /**   * 设置监听按钮点击事件   *   * @param onclickListener   */  @Override  public void setOnClickListener(OnClickListener onclickListener) {    if (onclickListener instanceof CountdownButton) {      super.setOnClickListener(onclickListener);    } else {      this.onClickListener = onclickListener;    }  }}