Android 实现手机验证时，按钮倒计时60s

手机注册一般都会有一个按钮，默认显示获取验证码，点击之后变成xx秒之后重新获取验证码

在网上查到有两种方法可以实现这种功能，一种是自定义一个timeButton,另外一种是利用封装好的60秒获取验证码工具类

第一种，首先在App.java类中添加一行代码

public static Map<String, Long> map;//用来存放倒计时的时间

然后将TimeButton类加入到工程中，时间默认是60s,也可以随后通过set方法，在代码中修改

package net.zhomi.negotiation.view.utils;

import java.util.HashMap;
import java.util.Map;
import java.util.Timer;
import java.util.TimerTask;

import net.zhomi.negotiation.app.App;

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Bundle;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class TimeButton extends Button implements OnClickListener {
    private long lenght = 60 * 1000;// 倒计时长度,这里给了默认60秒
    private String textafter = "秒后重新获取";
    private String textbefore = "点击获取验证码";
    private final String TIME = "time";
    private final String CTIME = "ctime";
    private OnClickListener mOnclickListener;
    private Timer t;
    private TimerTask tt;
    private long time;
    private Context mContext;
    Map<String, Long> map = new HashMap<String, Long>();

    public TimeButton(Context context) {
        super(context);
        setOnClickListener(this);

    }

    public TimeButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        setOnClickListener(this);
    }

    @SuppressLint("HandlerLeak")
    Handler han = new Handler() {
        public void handleMessage(android.os.Message msg) {
            TimeButton.this.setText(time / 1000 + textafter);
            time -= 1000;
            if (time < 0) {
                TimeButton.this.setEnabled(true);
                TimeButton.this.setText(textbefore);
                clearTimer();
            }
        };
    };

    private void initTimer() {
        time = lenght;
        t = new Timer();
        tt = new TimerTask() {

            @Override
            public void run() {
                Log.e("yung", time / 1000 + "");
                han.sendEmptyMessage(0x01);
            }
        };
    }

    private void clearTimer() {
        Toast.makeText(mContext, "计时结束", Toast.LENGTH_SHORT).show();
        if (tt != null) {
            tt.cancel();
            tt = null;
        }
        if (t != null)
            t.cancel();
        t = null;
    }

    @Override
    public void setOnClickListener(OnClickListener l) {
        if (l instanceof TimeButton) {
            super.setOnClickListener(l);
        } else
            this.mOnclickListener = l;
    }

    @Override
    public void onClick(View v) {
        if (mOnclickListener != null)
            mOnclickListener.onClick(v);
        initTimer();
        this.setText(time / 1000 + textafter);
        this.setEnabled(false);
        t.schedule(tt, 0, 1000);
        // t.scheduleAtFixedRate(task, delay, period);
    }

    /**
     * 和activity的onDestroy()方法同步
     */
    public void onDestroy() {
        if (App.map == null)
            App.map = new HashMap<String, Long>();
        App.map.put(TIME, time);
        App.map.put(CTIME, System.currentTimeMillis());
        clearTimer();
        Log.e("yung", "onDestroy");
    }

    /**
     * 和activity的onCreate()方法同步
     */
    public void onCreate(Bundle bundle) {
        Log.e("yung", App.map + "");
        if (App.map == null)
            return;
        if (App.map.size() <= 0)// 这里表示没有上次未完成的计时
            return;
        long time = System.currentTimeMillis() - App.map.get(CTIME)
                - App.map.get(TIME);
        App.map.clear();
        if (time > 0)
            return;
        else {
            initTimer();
            this.time = Math.abs(time);
            t.schedule(tt, 0, 1000);
            this.setText(time + textafter);
            this.setEnabled(false);
        }
    }

    /** * 设置计时时候显示的文本 */
    public TimeButton setTextAfter(String text1) {
        this.textafter = text1;
        return this;
    }

    /** * 设置点击之前的文本 */
    public TimeButton setTextBefore(String text0) {
        this.textbefore = text0;
        this.setText(textbefore);
        return this;
    }

    /**
     * 设置到计时长度
     *
     * @param lenght
     *            时间 默认毫秒
     * @return
     */
    public TimeButton setLenght(long lenght) {
        this.lenght = lenght;
        return this;
    }
    /*

*
*/
}

TimeButton在资源文件中的使用与Button并没有太大的不同

<net.zhomi.negotiation.view.utils.TimeButton//TimeButton所在的包
            android:id="@+id/btn_getcode"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_marginRight="15dp"
            android:layout_weight="2"
            android:background="@null"
            android:singleLine="true"
            android:text="60秒后重新获取"
            android:textColor="@color/balck"
            android:textSize="@dimen/normal_text_size" />

第二种

首先看封装的工具类

package com.example.timebtn;

import android.os.CountDownTimer;
import android.widget.Button;

public class TimerCount extends CountDownTimer {
    private Button bnt;

    public TimerCount(long millisInFuture, long countDownInterval, Button bnt) {
        super(millisInFuture, countDownInterval);
        this.bnt = bnt;
    }

    public TimerCount(long millisInFuture, long countDownInterval) {
        super(millisInFuture, countDownInterval);
        // TODO Auto-generated constructor stub
    }

    @Override
    public void onFinish() {
        // TODO Auto-generated method stub
        bnt.setClickable(true);
        bnt.setText("获取验证码");
    }

    @Override
    public void onTick(long arg0) {
        // TODO Auto-generated method stub
        bnt.setClickable(false);
        bnt.setText(arg0 / 1000 + "秒后重新获取");
    }
}

如何使用：

Button btn = (Button) findViewById(R.id.button1);
TimerCount timer = new TimerCount(60000, 1000, btn);
timer.start();

看起来第二种的代码更简单，但是还是建议用第一种。