android实现验证码按钮

<?xml version="1.0" encoding="utf-8"? 
<resources 
  <declare-styleable name="VerifyCodeButton" 
    <!--默认背景-- 
    <attr name="android:background" / 
    <!--点击后背景-- 
    <attr name="clickedBackground" format="reference" / 
    <!--倒计时间-- 
    <attr name="countdownTime" format="integer" / 
    <!--倒计时间后提示文字-- 
    <attr name="countdownText" format="string" / 
  </declare-styleable 
</resources 

public class VerifyCodeButton extends Button {
  private Context mContext;
  private int mClickedBackground;//点击后背景
  private int mBackground;//当前背景
  private String mCountdownownText;
  private int mCountdownTime = 60;
  private TimeCount mTimeCount;

  public VerifyCodeButton(Context context) {
    this(context, null);
  }

  public VerifyCodeButton(Context context, AttributeSet attrs) {
    this(context, attrs, android.R.attr.buttonStyle);
  }

  public VerifyCodeButton(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    mContext = context;
    initAttrs(attrs);
    init();
  }

  private void initAttrs(AttributeSet attrs) {
    TypedArray typedArray = mContext.obtainStyledAttributes(attrs, R.styleable.VerifyCodeButton);
    mBackground = typedArray.getResourceId(R.styleable.VerifyCodeButton_android_background, mBackground);
    mClickedBackground = typedArray.getResourceId(R.styleable.VerifyCodeButton_clickedBackground, mClickedBackground);
    mCountdownTime = typedArray.getInt(R.styleable.VerifyCodeButton_countdownTime, mCountdownTime);
    mCountdownownText = typedArray.getString(R.styleable.VerifyCodeButton_countdownText);
    typedArray.recycle();
  }

  private void init() {
    setBackgroundResource(mBackground);
    mTimeCount = new TimeCount(mCountdownTime * 1000, 1000);
  }

  /**
   * 开始计时
   */
  public void start() {
    mTimeCount.start();
  }

  /**
   * 取消计时
   */
  public void cancle() {
    mTimeCount.cancel();
    setClickable(true);
    setText(mCountdownownText != null ? mCountdownownText : "");
    setBackgroundResource(mBackground);
  }

  class TimeCount extends CountDownTimer {

    /**
     * @param millisInFuture  总时间
     * @param countDownInterval 间隔时间
     */
    public TimeCount(long millisInFuture, long countDownInterval) {
      super(millisInFuture, countDownInterval);
    }

    /**
     * @param millisUntilFinished 当前时间
     */
    @Override
    public void onTick(long millisUntilFinished) {
      setClickable(false);
      setText(String.valueOf(millisUntilFinished / 1000 + "s"));
      setBackgroundResource(mClickedBackground);
    }

    @Override
    public void onFinish() {
      setClickable(true);
      setText(mCountdownownText != null ? mCountdownownText : "");
      setBackgroundResource(mBackground);
    }
  }
}

<?xml version="1.0" encoding="utf-8"? 
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" 
  <corners android:radius="5dp" / 
  <solid android:color="#feacc3" / 
</shape 

<?xml version="1.0" encoding="utf-8"? 
<shape xmlns:android="http://schemas.android.com/apk/res/android"
  android:shape="rectangle" 
  <corners android:radius="5dp" / 
  <solid android:color="#999999" / 
</shape 

<?xml version="1.0" encoding="utf-8"? 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:app="http://schemas.android.com/apk/res-auto"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical"
  tools:context="com.sample.verify.MainActivity" 

  <com.sample.verify.widget.VerifyCodeButton
    android:id="@+id/btn_verify_code"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    android:layout_margin="10dp"
    android:background="@drawable/bg_btn_default"
    android:gravity="center"
    android:text="获取验证码"
    android:textColor="#ffffff"
    android:textSize="14sp"
    app:clickedBackground="@drawable/bg_btn_clicked"
    app:countdownText="重新获取"
    app:countdownTime="10" / 

  <Button
    android:id="@+id/btn_cancle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:text="取消倒计时" / 

</LinearLayout 

package com.sample.verify;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import com.sample.verify.widget.VerifyCodeButton;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

  private VerifyCodeButton btn_verify_code;
  private Button btn_cancle;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    setTitle("验证码");

    btn_verify_code = (VerifyCodeButton) findViewById(R.id.btn_verify_code);
    btn_cancle = (Button) findViewById(R.id.btn_cancle);

    btn_verify_code.setOnClickListener(this);
    btn_cancle.setOnClickListener(this);
  }

  @Override
  public void onClick(View v) {
    switch (v.getId()) {
      case R.id.btn_verify_code:
        btn_verify_code.start();
        break;
      case R.id.btn_cancle:
        btn_verify_code.cancle();
        break;
    }
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    if (btn_verify_code != null) {
      btn_verify_code.cancle();
    }
  }
}