[移动开发]Android 用 ListView 实现倒计时列表功能

 MyAdapter.java

public static class MyAdapter extends BaseAdapter {
    private List<TimerItem> mDatas;
    private Context mContext;

    //用于退出 Activity,避免 Countdown，造成资源浪费。
    private SparseArray<CountDownTimer> countDownCounters;

    public MyAdapter(Context mContext, List<TimerItem> mDatas) {
        this.mContext = mContext;
        this.mDatas = mDatas;
        this.countDownCounters = new SparseArray<>();
    }

    /**
     * 清空当前 CountTimeDown 资源
     */
    public void cancelAllTimers() {
        if (countDownCounters == null) {
            return;
        }
        Log.e("TAG",  "size :  " + countDownCounters.size());
        for (int i = 0, length = countDownCounters.size(); i < length; i++) {
            CountDownTimer cdt = countDownCounters.get(countDownCounters.keyAt(i));
            if (cdt != null) {
                cdt.cancel();
            }
    

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