Android自定义控件实现验证码倒计时

<com.landptf.view.CountDownM
 android:id="@+id/cdm_identifying_code"
 android:layout_width="wrap_content"
 android:layout_height="50dp"
 android:layout_alignParentRight="true"
 android:text="获取验证码"
 landptf:backColor="@color/colorPrimary"
 landptf:countDownSeconds="10"/>

CountDownM cdmIdentifyingCode = (CountDownM) findViewById(R.id.cdm_identifying_code);
if (cdmIdentifyingCode != null) {
 cdmIdentifyingCode.setOnClickListener(new CountDownM.OnClickListener() {
  @Override
  public void onClick(View v) {
   Toast.makeText(CountDownMTestActivity.this, "验证码发送成功", Toast.LENGTH_SHORT).show();
  }
 });
}

/**
 * Created by landptf on 2017/03/15.
 * 获取验证码倒计时控件
 */
public class CountDownM extends ButtonM {

 private OnClickListener onClickListener = null;
 private CountDownTimer countDownTimer;
 /**
  * 倒计时总时长
  */
 private int countDownSeconds = 60;
 /**
  * 按钮的背景色
  */
 private int backColor = 0;

 public interface OnClickListener{
  void onClick(View v);
 }

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

 public CountDownM(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
 }

 public CountDownM(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.countDownM, defStyle, 0);
  if (a != null) {
   //设置背景色
   ColorStateList colorList = a.getColorStateList(R.styleable.countDownM_backColor);
   if (colorList != null) {
    backColor = colorList.getColorForState(getDrawableState(), 0);
    if (backColor != 0) {
     setBackColor(backColor);
    }
   } else {
    setBackColor(getResources().getColor(R.color.mainColor));
   }
   //获取倒计时总时长
   int countDownSeconds = a.getInteger(R.styleable.countDownM_countDownSeconds, 60);
   setCountDownSeconds(countDownSeconds);
   a.recycle();
  }
  //设置文字颜色
  setTextColor(getResources().getColor(android.R.color.white));
  //设置位置相关属性
  setGravity(Gravity.CENTER);
  setPadding(ConvertM.dp2px(context, 8), 0, ConvertM.dp2px(context, 8), 0);
  setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    if (onClickListener != null) {
     onClickListener.onClick(v);
    }
    //点击后开始计时
    start();
   }
  });
 }

 /**
  * 设置倒计时总时长
  * @param countDownSeconds
  */
 public void setCountDownSeconds(int countDownSeconds){
  this.countDownSeconds = countDownSeconds;
 }

 /**
  * 设置背景色
  * @param backColor
  */
 @Override
 public void setBackColor(int backColor) {
  this.backColor = backColor;
  super.setBackColor(backColor);
 }

 /**
  * 停止倒计时
  */
 public void stop(){
  countDownTimer.cancel();
  resetButton();
 }

 public void setOnClickListener(OnClickListener l){
  this.onClickListener = l;
 }

 private void start(){
  setEnabled(false);//设置不能点击
  countDownTimer = new CountDownTimer(countDownSeconds * 1000, 1000) {
   @Override
   public void onTick(long millisUntilFinished) {
    setText(millisUntilFinished / 1000 + getResources().getString(R.string.count_down_m_recapture_after));//设置倒计时时间
    //设置按钮为灰色，这时是不能点击的
    CountDownM.super.setBackColor(Color.GRAY);
    Spannable span = new SpannableString(getText().toString());//获取按钮的文字
    span.setSpan(new ForegroundColorSpan(Color.RED), 0, 2, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);//讲倒计时时间显示为红色
    setText(span);
   }

   @Override
   public void onFinish() {
    resetButton();
   }
  };
  countDownTimer.start();
 }

 private void resetButton(){
  setText(getResources().getString(R.string.count_down_m_recapture));
  setEnabled(true);//重新获得点击
  if (backColor != 0) {
   setBackColor(backColor);//还原背景色
  } else {
   setBackColor(getResources().getColor(R.color.mainColor));//还原背景色
  }
 }
}