Android 获取验证码倒计时实现

        <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="50dp"
           android:background="@color/white"
           android:orientation="horizontal" >           <EditText
               android:id="@+id/phonetext"
               android:layout_width="0dp"
               android:layout_height="match_parent"
               android:layout_weight="1"
               android:layout_marginLeft="15dp"
               android:layout_gravity="center_vertical"
               android:inputType="number"
               android:hint="请输入短信验证码"
               android:background="@null"/>           <Button
               android:id="@+id/timebutton"
               android:layout_width="wrap_content"
               android:layout_height="30dp"
               android:layout_marginRight="15dp"
               android:layout_marginTop="10dp"
               android:textSize="16dp"
               android:background="@drawable/tv_timemessage_bg"
               android:text="获取"
               />       </LinearLayout>

/**
* Created by fby on 2017/9/11.
*/
public class ChargepsdActivity extends Activity {   private Button timeButton;   @Override
   protected void onCreate(@Nullable Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_chargepsd);       timeButton = (Button) findViewById(R.id.timebutton);
       //new倒计时对象,总共的时间,每隔多少秒更新一次时间
       final MyCountDownTimer myCountDownTimer = new MyCountDownTimer(60000,1000);       //设置Button点击事件触发倒计时
       timeButton.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View view) {
               myCountDownTimer.start();
           }
       });   }

   //倒计时函数
   private class MyCountDownTimer extends CountDownTimer {       public MyCountDownTimer(long millisInFuture, long countDownInterval) {
           super(millisInFuture, countDownInterval);
       }       //计时过程
       @Override
       public void onTick(long l) {
           //防止计时过程中重复点击
           timeButton.setClickable(false);
           timeButton.setText(l/1000+"秒");       }       //计时完毕的方法
       @Override
       public void onFinish() {
           //重新给Button设置文字
           timeButton.setText("重新获取");
           //设置可点击
           timeButton.setClickable(true);
       }
   }}

private void clearTimer() {
       if (task != null) {
           task.cancel();
           task = null;
       }
       if (timer != null) {
           timer.cancel();
           timer = null;
       }
   }