android中所有（个别）应用程序的使用时间[用法]

Question

我尝试执行下面的代码，但这会给出＆＃34;上次使用＆＃34;应用程序。

public class UsageListAdapter extends RecyclerView.Adapter<UsageListAdapter.ViewHolder> {

private List<CustomUsageStats> mCustomUsageStatsList = new ArrayList<>();
    private DateFormat mDateFormat = new SimpleDateFormat();

    /**
     * Provide a reference to the type of views that you are using (custom ViewHolder)
     */
    public static class ViewHolder extends RecyclerView.ViewHolder {
        private final TextView mPackageName;
        private final TextView mLastTimeUsed;
        private final ImageView mAppIcon;

        public ViewHolder(View v) {
            super(v);
            mPackageName = (TextView) v.findViewById(R.id.textview_package_name);
            mLastTimeUsed = (TextView) v.findViewById(R.id.textview_last_time_used);
            mAppIcon = (ImageView) v.findViewById(R.id.app_icon);
        }

        public TextView getLastTimeUsed() {
            return mLastTimeUsed;
        }

        public TextView getPackageName() {
            return mPackageName;
        }

        public ImageView getAppIcon() {
            return mAppIcon;
        }
    }

    public UsageListAdapter() {
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
        View v = LayoutInflater.from(viewGroup.getContext())
                .inflate(R.layout.usage_row, viewGroup, false);
        return new ViewHolder(v);
    }

    @Override
    public void onBindViewHolder(ViewHolder viewHolder, final int position) {
        viewHolder.getPackageName().setText(
                mCustomUsageStatsList.get(position).usageStats.getPackageName());
        long lastTimeUsed = mCustomUsageStatsList.get(position).usageStats.getLastTimeUsed();
        viewHolder.getLastTimeUsed().setText(mDateFormat.format(new Date(lastTimeUsed)));
        viewHolder.getAppIcon().setImageDrawable(mCustomUsageStatsList.get(position).appIcon);
    }

    @Override
    public int getItemCount() {
        return mCustomUsageStatsList.size();
    }

    public void setCustomUsageStatsList(List<CustomUsageStats> customUsageStats) {
        mCustomUsageStatsList = customUsageStats;
    }
}

所以任何人都可以修改它并获得每个应用程序的使用时间（在前景/背景中）并显示它。