Android 简单封装获取验证码倒计时功能

<resources>
 <declare-styleable name="CountDownButton">
  <attr name="millisinfuture" format="integer"/>
  <attr name="countdowninterva" format="integer"/>
  <attr name="normalColor" format="color"/>
  <attr name="countDownColor" format="color"/>
 </declare-styleable>
</resources>

/**
 * Created by xiaolong on 2018/1/12.
 */
@SuppressLint("AppCompatCustomView")
public class CountDownButton extends Button{
 //总时长
 private long millisinfuture;
 //间隔时长
 private long countdowninterva;
 //默认背景颜色
 private int normalColor;
 //倒计时 背景颜色
 private int countDownColor;
 //是否结束
 private boolean isFinish;
 //定时器
 private CountDownTimer countDownTimer;
 public CountDownButton(Context context) {
  this(context,null);
 }
 public CountDownButton(Context context, AttributeSet attrs) {
  this(context, attrs,0);
 }
 public CountDownButton(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  TypedArray typedArray = context.getTheme().obtainStyledAttributes(attrs, R.styleable.CountDownButton,defStyleAttr,0);
  //设置默认时长
  millisinfuture = (long) typedArray.getInt(R.styleable.CountDownButton_millisinfuture,60000);
  //设置默认间隔时长
  countdowninterva = (long)typedArray.getInt(R.styleable.CountDownButton_countdowninterva,1000);
  //设置默认背景色
  normalColor = typedArray.getColor(R.styleable.CountDownButton_normalColor,android.R.color.holo_blue_light);
  //设置默认倒计时 背景色
  countDownColor = typedArray.getColor(R.styleable.CountDownButton_countDownColor,android.R.color.darker_gray);
  typedArray.recycle();
  //默认为已结束状态
  isFinish = true;
  //字体居中
  setGravity(Gravity.CENTER);
  //默认文字和背景色
  normalBackground();
  //设置定时器
  countDownTimer = new CountDownTimer(millisinfuture, countdowninterva) {
   @Override
   public void onTick(long millisUntilFinished) {
    //未结束
    isFinish = false;
    setText((Math.round((double) millisUntilFinished / 1000) - 1) + "秒");
    setBackgroundResource(countDownColor);
   }
   @Override
   public void onFinish() {
    //结束
    isFinish = true;
    normalBackground();
   }
  };
 }
 private void normalBackground(){
  setText("获取验证码");
  setBackgroundResource(normalColor);
 }
 public boolean isFinish() {
  return isFinish;
 }
 public void cancel(){
  countDownTimer.cancel();
 }
 public void start(){
  countDownTimer.start();
 }
}

public class MainActivity extends AppCompatActivity {
 private CountDownButton countDownButton;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  countDownButton = ((CountDownButton) findViewById(R.id.countDownButton));
  countDownButton.setOnClickListener(new View.OnClickListener() {
   @Override
   public void onClick(View view) {
    //这里判断是否倒计时结束，避免在倒计时时多次点击导致重复请求接口
    if (countDownButton.isFinish()) {
     //发送验证码请求成功后调用
     countDownButton.start();
    }
   }
  });
 }
 @Override
 protected void onDestroy() {
  super.onDestroy();
  if (!countDownButton.isFinish()) {
   countDownButton.cancel();
  }
 }
}