获取短信验证码时的倒计时按钮实现

布局文件

<?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"
    tools:context="com.example.longfei.smsyan.MainActivity">

    <TextView
        android:id="@+id/tv"
        android:layout_width="match_parent"
        android:layout_margin="5dp"
        android:layout_height="50dp"
        android:text="发送消息"
        android:gravity="center"
        android:background="@drawable/bg_identify_code_normal"
        />
</RelativeLayout>

Activity代码

package com.example.longfei.smsyan;

import android.graphics.Color;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.style.ForegroundColorSpan;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private TextView mTextView;

    // 总倒计时时间
    private static final long MILLIS_IN_FUTURE = 60 * 1000;
    // 每次减去1秒
    private static final long COUNT_DOWN_INTERVAL = 1000;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mTextView = (TextView) findViewById(R.id.tv);


        mTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 设置按钮为不可点击，并修改显示背景
                mTextView.setEnabled(false);
                mTextView.setBackgroundResource(R.drawable.bg_identify_code_press);
                // 开始倒计时
                new CountDownTimer(MILLIS_IN_FUTURE, COUNT_DOWN_INTERVAL) {
                    @Override
                    public void onTick(long millisUntilFinished) {
                        // 刷新文字
                        mTextView.setText(millisUntilFinished / COUNT_DOWN_INTERVAL+ "秒后可重新发送");
                        SpannableString spannableString = new SpannableString(mTextView.getText().toString());  //获取按钮上的文字
                        ForegroundColorSpan span = new ForegroundColorSpan(Color.RED);
                        spannableString.setSpan(span, 0, 2, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);//将倒计时的时间设置为红色
                        mTextView.setText(spannableString);
                    }

                    @Override
                    public void onFinish() {
                        // 重置文字，并恢复按钮为可点击
                        mTextView.setText("重新获取验证码");
                        mTextView.setEnabled(true);//重新获得点击
                        mTextView.setBackgroundResource(R.drawable.bg_identify_code_normal);  //还原背景色

                    }
                }.start();
            }
        });
    }
}

图片界面shape

bg_identify_code_normal

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#FF9933" /> <!--填充色 透明-->
    <corners android:radius="8dp" />  <!-- 圆角 -->
</shape>

bg_identify_code_press

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <solid android:color="#C0C0C0" /> <!--填充色 透明-->
    <corners android:radius="8dp" />  <!-- 圆角 -->
</shape>