簡單的倒計時

public class CountdownTimerActivity extends Activity {
private TimeCount time;
private Button checking;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
time = new TimeCount(60000, 1000);
checking = (Button) findViewById(R.id.button1);
checking.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
time.start();//開始計時
}
});
}
/* 定義一個倒計時的內部類 */
class TimeCount extends CountDownTimer {
public TimeCount(long millisInFuture, long countDownInterval) {
super(millisInFuture, countDownInterval);//參數依次爲總時長,和計時的時間間隔
}
@Override
public void onFinish() {//計時完畢時觸發
checking.setText("重新驗證");
checking.setClickable(true);
}
@Override
public void onTick(long millisUntilFinished){//計時過程顯示
checking.setClickable(false);
checking.setText(millisUntilFinished /1000+"秒");
}

}

/////////////////////////////////////////////////////////

自定義倒計時

import android.os.Handler;
import android.os.Message;
public abstract class AdvancedCountdownTimer {
private final long mCountdownInterval;
private long mTotalTime;
private long mRemainTime;

public AdvancedCountdownTimer(long millisInFuture, long countDownInterval) {
mTotalTime = millisInFuture;
mCountdownInterval = countDownInterval;
mRemainTime = millisInFuture;
}
public final void seek(int value) {
synchronized (AdvancedCountdownTimer.this) {
mRemainTime = ((100 - value) * mTotalTime) / 100;
}
}

public final void cancel() {
mHandler.removeMessages(MSG_RUN);
mHandler.removeMessages(MSG_PAUSE);
}
public final void resume() {
mHandler.removeMessages(MSG_PAUSE);
mHandler.sendMessageAtFrontOfQueue(mHandler.obtainMessage(MSG_RUN));
}
public final void pause() {
mHandler.removeMessages(MSG_RUN);
mHandler.sendMessageAtFrontOfQueue(mHandler.obtainMessage(MSG_PAUSE));
}

public synchronized final AdvancedCountdownTimer start() {
if (mRemainTime <= 0) {
onFinish();
return this;
}
mHandler.sendMessageDelayed(mHandler.obtainMessage(MSG_RUN),
mCountdownInterval);
return this;
}
public abstract void onTick(long millisUntilFinished, int percent);

public abstract void onFinish();
private static final int MSG_RUN = 1;
private static final int MSG_PAUSE = 2;
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
synchronized (AdvancedCountdownTimer.this) {
if (msg.what == MSG_RUN) {
mRemainTime = mRemainTime - mCountdownInterval;
if (mRemainTime <= 0) {
onFinish();
} else if (mRemainTime < mCountdownInterval) {
sendMessageDelayed(obtainMessage(MSG_RUN), mRemainTime);
} else {
onTick(mRemainTime, new Long(100
* (mTotalTime - mRemainTime) / mTotalTime)
.intValue());

sendMessageDelayed(obtainMessage(MSG_RUN),
mCountdownInterval);
}
} else if (msg.what == MSG_PAUSE) {
}
}
}
};
}