获取短信验证码时的倒计时按钮实现

<?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>

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();
}
});
}
}

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>