android特卖列表倒计时卡顿问题的解决方法

在Android的开发中，我们经常遇见倒计时的操作，通常使用Timer和Handler共同操作来完成。当然也可以使用Android系统控件CountDownTimer，这里我们封装成一个控件，也方便大家的使用。

首先上一张效果图吧：

说一下造成卡顿的原因，由于滑动的时候，adapter的getView频繁的创建和销毁，就会出现卡顿和数据错位问题，那么我们每一个item的倒计时就需要单独维护，这里我用的Handler与timer及TimerTask结合的方法，我们知道TimerTask运行在自己子线程，然后通过Timer的schedule（）方法实现倒计时功能，最后通过Hander实现View的刷新，其核心代码如下：

public class CountDownView extends LinearLayout {

 @BindView(R.id.tv_day)
 TextView tvDay;
 @BindView(R.id.tv_hour)
 TextView tvHour;
 @BindView(R.id.tv_minute)
 TextView tvMinute;
 @BindView(R.id.tv_second)
 TextView tvSecond;

 @BindView(R.id.day)
 TextView day;
 @BindView(R.id.hour)
 TextView hour;
 @BindView(R.id.minute)
 TextView minute;

 private Context context;

 private int viewBg;//倒计时的背景
 private int cellBg;//每个倒计时的背景
 private int cellTextColor;//文字颜色
 private int textColor;//外部：等颜色
 private int textSize = 14;//外部文字大小
 private int cellTextSize = 12;//cell文字大小

 private TimerTask timerTask = null;
 private Timer timer = new Timer();
 private Handler handler = new Handler() {

  public void handleMessage(Message msg) {
   countDown();
  }
 };

 public CountDownView(Context context, AttributeSet attrs) {
  this(context, attrs, 0);
  this.context = context;
 }

 public CountDownView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  this.context = context;
  initAttrs(attrs, defStyleAttr);
  initView(context);
 }

 private void initAttrs(AttributeSet attrs, int defStyle) {
  TypedArray typedArray = getContext().obtainStyledAttributes(attrs, R.styleable.CountDownView, defStyle,0);
  viewBg = typedArray.getColor(R.styleable.CountDownView_viewBg, Color.parseColor("#FFFFFF"));
  cellBg = typedArray.getColor(R.styleable.CountDownView_cellBg, Color.parseColor("#F4F4F4"));
  cellTextColor = typedArray.getColor(R.styleable.CountDownView_cellTextColor, Color.parseColor("#646464"));
  textColor = typedArray.getColor(R.styleable.CountDownView_TextColor, Color.parseColor("#B3B3B3"));
  textSize = (int) typedArray.getDimension(R.styleable.CountDownView_TextSize, UIUtils.dp2px(getContext(), 14));
  cellTextSize = (int) typedArray.getDimension(R.styleable.CountDownView_cellTextSize, UIUtils.dp2px(getContext(), 12));
  typedArray.recycle();

 }

 private void initView(Context context) {
  LayoutInflater inflater = (LayoutInflater) context
    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
  View view = inflater.inflate(R.layout.layout_countdown_layout, this);
  ButterKnife.bind(view);

  initProperty();
 }

 private void initProperty() {
  tvDay.setBackgroundColor(cellBg);
  tvHour.setBackgroundColor(cellBg);
  tvMinute.setBackgroundColor(cellBg);
  tvSecond.setBackgroundColor(cellBg);

  tvDay.setTextColor(cellTextColor);
  tvHour.setTextColor(cellTextColor);
  tvMinute.setTextColor(cellTextColor);
  tvSecond.setTextColor(cellTextColor);

  day.setTextColor(textColor);
  hour.setTextColor(textColor);
  minute.setTextColor(textColor);
 }

 public void setLeftTime(long leftTime) {
  if (leftTime <= 0) return;
  long time = leftTime / 1000;
  long day = time / (3600 * 24);
  long hours = (time - day * 3600 * 24) / 3600;
  long minutes = (time - day * 3600 * 24 - hours * 3600) / 60;
  long seconds = time - day * 3600 * 24 - hours * 3600 - minutes * 60;

  setTextTime(time);
 }

 public void start() {
  if (timerTask == null) {
   timerTask = new TimerTask() {
    @Override
    public void run() {
     handler.sendEmptyMessage(0);
    }

   };
   timer.schedule(timerTask, 1000, 1000);
//   timer.schedule(new TimerTask() {
//    @Override
//    public void run() {
//     handler.sendEmptyMessage(0);
//    }
//   }, 0, 1000);
  }
 }

 public void stop() {
  if (timer != null) {
   timer.cancel();
   timer = null;
  }
 }

 //保证天，时，分，秒都两位显示，不足的补0
 private void setTextTime(long time) {
  String[] s = TimeUtils.formatTimer(time);
  tvDay.setText(s[0]);
  tvHour.setText(s[1]);
  tvMinute.setText(s[2]);
  tvSecond.setText(s[3]);
 }

 private void countDown() {
  if (isCarry4Unit(tvSecond)) {
   if (isCarry4Unit(tvMinute)) {
    if (isCarry4Unit(tvHour)) {
     if (isCarry4Unit(tvDay)) {
      stop();
     }
    }
   }
  }
 }

 private boolean isCarry4Unit(TextView tv) {
  int time = Integer.valueOf(tv.getText().toString());
  time = time - 1;
  if (time < 0) {
   time = 59;
   tv.setText(time + "");
   return true;
  } else if (time < 10) {
   tv.setText("0" + time);
   return false;
  } else {
   tv.setText(time + "");
   return false;
  }
 }
}

另一种写法：

public class CountDownTimerView extends LinearLayout {

 private TextView hourView, minuteView, secondView;
 private LimitTimer mTimer;
 private Handler handler;
 public static final int START_LIMIT_TIME_MSG = 0x0111;
 public static final int END_LIMIT_TIME_MSG = 0x0112;
 private long endTime, leftTime;
 private LimitTimeListener listener=null;

 public CountDownTimerView(Context context) {
  super(context);
  initView(context);
 }

 public CountDownTimerView(Context context, AttributeSet attrs) {
  super(context, attrs);
  initView(context);
 }

 private void initView(Context context) {
  setOrientation(HORIZONTAL);
  setGravity(Gravity.CENTER_VERTICAL);
  inflate(context, R.layout.layout_countdown_layout, this);
  hourView = (TextView) findViewById(R.id.tv_hour);
  minuteView = (TextView) findViewById(R.id.tv_minute);
  secondView = (TextView) findViewById(R.id.tv_second);
 }

 public long getLeftTime() {
  return leftTime;
 }

 //设置剩余时间
 public void initLeftTime(long endTime) {
  endTime=endTime*1000;
  if (null != mTimer) {
   mTimer.cancel();
   mTimer = null;
  }
  this.endTime = endTime;
  mTimer = new LimitTimer(endTime, 1000);
  mTimer.start();
  if (handler != null) {
   handler.sendEmptyMessage(START_LIMIT_TIME_MSG);
  }
 }

 /**
  * 如果该控件使用在碎片中，返回时，则最好还是要stop
  */
 public void stopTimeCount() {
  if (null != mTimer) {
   mTimer.cancel();
   mTimer = null;
  }
 }

 public Handler getHandler() {
  return handler;
 }

 public void setHandler(Handler handler) {
  this.handler = handler;
 }

 private class LimitTimer extends CountDownTimer {

  public LimitTimer(long millisInFuture, long countDownInterval) {
   super(0 != leftTime ? leftTime : endTime, countDownInterval);
  }

  @Override
  public void onTick(long millisUntilFinished) {
   leftTime = millisUntilFinished;
   long totalSecond = millisUntilFinished / 1000;
   int second = (int) (totalSecond % 60);
   int minute = (int) ((totalSecond / 60) % 60);
   int hour = (int) ((totalSecond / 3600) % 24);
   int day = (int) (totalSecond / (3600 * 24));

   formatView(hourView, hour);
   formatView(minuteView, minute);
   formatView(secondView, second);
  }

  @Override
  public void onFinish() {
   String zero = "00";
   hourView.setText(zero);
   minuteView.setText(zero);
   secondView.setText(zero);
   if (null != handler) {
    handler.sendEmptyMessage(END_LIMIT_TIME_MSG);
   }
   if (listener!=null){
    listener.onTimeOver(true);
   }
  }

  private void formatView(TextView view, int time) {
   DecimalFormat df = new DecimalFormat("#00");
   view.setText(df.format(time));
  }
 }

 //倒计时结束监听
 public void setOnLimitTimeListener(LimitTimeListener listener) {
  this.listener = listener;
 }
 public interface LimitTimeListener {
  void onTimeOver(boolean flag);
 }

 @Override
 protected void onDetachedFromWindow() {
  super.onDetachedFromWindow();
  if (handler != null) {
   handler.removeMessages(START_LIMIT_TIME_MSG);
  }
 }
}

涉及到的布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:orientation="horizontal">

 <TextView
  android:id="@+id/tv_hour"
  style="@style/style_countdown" />

 <TextView
  style="@style/style_wrap_content"
  android:layout_marginLeft="3dp"
  android:layout_marginRight="3dp"
  android:layout_gravity="center_vertical"
  android:text="时"
  android:textColor="@color/color_646464" />

 <TextView
  android:id="@+id/tv_minute"
  style="@style/style_countdown" />

 <TextView
  style="@style/style_wrap_content"
  android:layout_marginLeft="3dp"
  android:layout_marginRight="3dp"
  android:layout_gravity="center_vertical"
  android:text="分"
  android:textColor="@color/color_646464" />

 <TextView
  android:id="@+id/tv_second"
  style="@style/style_countdown" />

 <TextView
  style="@style/style_wrap_content"
  android:layout_marginLeft="3dp"
  android:layout_marginRight="3dp"
  android:layout_gravity="center_vertical"
  android:text="秒"
  android:textColor="@color/color_646464" />
</LinearLayout>

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