利用CountDownTimer倒计时的简单使用实现

package com.loaderman.countdowntimerdemo;

import android.os.Bundle;

import android.os.CountDownTimer;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView tvTime;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        tvTime = (TextView) findViewById(R.id.tv_time);

        tvTime.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                new countDownTimer<TextView>(tvTime);

            }

        });

    }

    public class countDownTimer<T> extends CountDownTimer {

        private TextView mTextView;

        public countDownTimer(T text) {

            super(60000,1000);

            this.mTextView = ((TextView)text);

            mTextView.setClickable(false);

            start();

        }

        /**

         * start后开始执行的方法，按照间隔时间执行一次

         * @param millisUntilFinished

         */

        @Override

        public void onTick(long millisUntilFinished) {

            mTextView.setText(String.format("%s秒",millisUntilFinished/1000));

        }

        /**

         *  时间结束时调用的方法

         */

        @Override

        public void onFinish() {

            mTextView.setText("获取验证码");

            mTextView.setClickable(true);

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout

    xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:id="@+id/activity_main"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:gravity="center"

    tools:context="com.loaderman.countdowntimerdemo.MainActivity">

    <TextView

        android:textColor="#F00"

        android:textSize="18sp"

        android:id="@+id/tv_time"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="开始倒计时"/>

</RelativeLayout>

效果图: