倒计时button(借鉴CountDownButton)

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看了简书上的一片关于CountDownButton的文章：Hyena-CountDownButton-倒计时按钮
用了里面的思路自己写了下。
主要代码

public class CountDownButton extends Button {    private String text;    private String content;    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);        init(context, attrs);    }    private void init(Context context, AttributeSet attrs) {        TypedArray typedArray = context.getResources().obtainAttributes(attrs, R.styleable.CountDownButton);        long countDownInterval = typedArray.getInteger(R.styleable.CountDownButton_countDownInterval, 1)*1000;        long millisInFuture = typedArray.getInteger(R.styleable.CountDownButton_millisInFuture, 5)*1000;        timer = new MyCount(millisInFuture, countDownInterval);        typedArray.recycle();    }    public void start() {        content = getText().toString().trim();        timer.start();        this.setEnabled(false);    }    public void cancel() {        timer.cancel();    }    private MyCount timer;    private class MyCount extends CountDownTimer {        /**         * @param millisInFuture    The number of millis in the future from the call         *                          to {@link #start()} until the countdown is done and {@link #onFinish()}         *                          is called.         * @param countDownInterval The interval along the way to receive         *                          {@link #onTick(long)} callbacks.         */        public MyCount(long millisInFuture, long countDownInterval) {            super(millisInFuture, countDownInterval);        }        @Override        public void onTick(long millisUntilFinished) {            String time = "" + (millisUntilFinished / 1000);            Log.i(TAG, "onTick: "+time);            CountDownButton.this.setText(time);        }        private static final String TAG = "MyCount";        @Override        public void onFinish() {            CountDownButton.this.setText(content);            CountDownButton.this.setEnabled(true);        }    }}

自定义属性

<?xml version="1.0" encoding="utf-8"?><resources>    <declare-styleable name="CountDownButton">        <attr name="millisInFuture" format="integer"/>        <attr name="countDownInterval" format="integer"/>    </declare-styleable></resources>

布局

<com.nevermore.rounrect.CountDownButton        android:layout_centerInParent="true"        android:id="@+id/cdb"        android:background="@drawable/bg_count_down"        android:text="发送验证码"        android:gravity="center"        app:millisInFuture="20"        app:countDownInterval="1"        android:layout_width="110dp"        android:padding="15dp"        android:layout_height="wrap_content" />

bg_count_down

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_enabled="true">        <shape android:shape="rectangle">            <corners android:radius="8dp"/>            <solid android:color="#2eb7ed"/>        </shape>    </item>    <item android:state_enabled="false">        <shape android:shape="rectangle">            <corners android:radius="8dp"/>            <solid android:color="#999999"/>        </shape>    </item></selector>

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