button获取验证码 点击倒计时

自定义button

package com.bw.text.logindemo;import android.content.Context;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.widget.Button;import java.util.Timer;import java.util.TimerTask;/** * Created by wangyaqian on 2016/9/20. */public class TimeButton extends Button{    private long lenght = 60 * 1000;// 倒计时长度，默认60秒    private String textafter = "s后重新获取";    private String textbefore = "获取验证码";    private Timer t;    private TimerTask tt;    private long time;    public TimeButton(Context context) {        super(context);    }    public TimeButton(Context context, AttributeSet attrs) {        super(context, attrs);    }    public void start() {        initTimer();        this.setText(time / 1000 + textafter);        this.setEnabled(false);        t.schedule(tt, 0, 1000);    }    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            TimeButton.this.setText(time / 1000 + textafter);            time -= 1000;            if (time < 0) {                TimeButton.this.setEnabled(true);                TimeButton.this.setText(textbefore);                clearTimer();            }        }    };    private void clearTimer() {        if (tt != null) {            tt.cancel();            tt = null;        }        if (t != null) {            t.cancel();            t = null;        }    }    private void initTimer() {        time = lenght;        t = new Timer();        tt = new TimerTask() {            @Override            public void run() {                handler.sendEmptyMessage(0x01);            }        };    }    /**     * 设置计时时候显示的文本     */    public TimeButton setTextAfter(String after)    {        this.textafter = after;        return this;    }    /**     * 设置点击之前的文本     */    public TimeButton setTextBefore(String before)    {        this.textbefore = before;        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;    }}

测试类：

public class OtherActivity extends AppCompatActivity {    private TimeButton btn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_other);        btn = (TimeButton) findViewById(R.id.btn);        btn.setTextBefore("获取验证码").setTextAfter("s后重新获取").setLenght(60 * 1000);    }    public void startDian(View view){        btn.start();    }}