这是一个倒计时功能的button。
使用的时候,btn对象直接调用start,cancel方法就可以实现开始计时,取消计时
public class CountdownButton extends android.support.v7.widget.AppCompatButton {
private final int able = R.drawable.plat_condition_btn_able;
private Stopwatch stopwatch = null;
private int countTime = 60;
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);
setText(" 点击获取验证码 ");
resetWatch();
setEnabled(true);
}
@Override
public void setEnabled(boolean enabled) {
setBackground(enabled);
super.setEnabled(enabled);
}
private void setBackground(boolean enabled) {
if (enabled) {
setTextColor(Color.WHITE);
setBackgroundResource(able);
} else {
setTextColor(0xFFa29395);
setBackground(null);
}
}
public void start() {
setEnabled(false);
stopwatch.cancel();
stopwatch.start();
}
public void cancel() {
setEnabled(true);
stopwatch.cancel();
setText(" 重新获取验证码 ");
resetWatch();
}
private void resetWatch(){
stopwatch = new Stopwatch(countTime * 1000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
setText(" " + (millisUntilFinished / 1000 + ((millisUntilFinished % 1000 > 500) ? 1 : 0) + "s后重新发送 "));
}
@Override
public void onFinish() {
setText(" 重新获取验证码 ");
setEnabled(true);
}
};
}
@Override
protected void onDetachedFromWindow() {
super.onDetachedFromWindow();
cancel();
}
}
计时器stopwatch:
public abstract class Stopwatch{
private static final String TAG = "Stopwatch";
/**
* Millis since epoch when alarm should stop.
*/
private final long mMillisInFuture;
/**
* The interval in millis that the user receives callbacks
*/
private final long mCountdownInterval;
private long mStopTimeInFuture;
/**
* boolean representing if the timer was cancelled
*/
private boolean mCancelled = false;
/**
* @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 Stopwatch(long millisInFuture, long countDownInterval) {
mMillisInFuture = millisInFuture;
mCountdownInterval = countDownInterval;
}
/**
* Cancel the countdown.
*/
public synchronized final void cancel() {
mCancelled = true;
mHandler.removeMessages(MSG);
}
/**
* Start the countdown.
*/
public synchronized final Stopwatch start() {
mCancelled = false;
if (mMillisInFuture <= 0) {
onFinish();
return this;
}
mStopTimeInFuture = SystemClock.elapsedRealtime() + mMillisInFuture;
mHandler.sendMessage(mHandler.obtainMessage(MSG));
return this;
}
/**
* Callback fired on regular interval.
* @param millisUntilFinished The amount of time until finished.
*/
public abstract void onTick(long millisUntilFinished);
/**
* Callback fired when the time is up.
*/
public abstract void onFinish();
private static final int MSG = 1;
// handles counting down
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (Stopwatch.this) {
if (mCancelled) {
return;
}
final long millisLeft = mStopTimeInFuture - SystemClock.elapsedRealtime();
Log.d(TAG, "Handler"+millisLeft);
if (millisLeft <= 0) {
onFinish();
} else if (millisLeft < mCountdownInterval) {
if(mMillisInFuture%mCountdownInterval==0)
onTick(millisLeft);
sendMessageDelayed(obtainMessage(MSG), millisLeft);
} else {
long lastTickStart = SystemClock.elapsedRealtime();
onTick(millisLeft);
// take into account user's onTick taking time to execute
long delay = lastTickStart + mCountdownInterval - SystemClock.elapsedRealtime();
// special case: user's onTick took more than interval to
// complete, skip to next interval
while (delay < 0) delay += mCountdownInterval;
sendMessageDelayed(obtainMessage(MSG), delay);
}
}
}
};
}