Android倒计时(ListView/Gridview中多个倒计时同时进行)

    项目中刚好用到需要在GridView和ListView中进行倒计时处理，多个倒计时同时进行，毫秒级别的(分:秒:毫秒)，整理一下拿出来和大家分享。

效果图：

主要思路很简单：1、获取后台的给的时间与当前时间相减，得到需要倒计时的时间

            2、将得到的时间换算成毫秒（根据实际需求换算）,开启子线程做递减

            3、最后利用handler循环更新界面

直接上代码:

1、Activity

public class MainActivity extends Activity{

    public static List list;
    private ListView listView;
    private MainListAdapter adapter;

    Handler handler = new Handler(){

        @Override
        public void handleMessage(Message msg) {
            if (msg.what ==1) {
                adapter.notifyDataSetChanged();
                //每隔1毫秒更新一次界面，如果只需要精确到秒的倒计时此处改成1000即可
                handler.sendEmptyMessageDelayed(1,1);
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.list_view);

        //测试数据
        list = new ArrayList<>();
        for (int i = 1; i < 5; i++) {
            Person person = new Person();
            person.setName("产品"+i);
            person.setTime(90000 + i + "");
            list.add(person);
        }
        // 数据拿到开始计时
        adapter = new MainListAdapter(this,list);
        listView.setAdapter(adapter);
        adapter.start();//开始倒计时

        handler.sendEmptyMessageDelayed(1,1);
    }
}

2、Adapter

public class MainListAdapter extends BaseAdapter {

    private List list;
    private LayoutInflater layoutInflater;

    public MainListAdapter(Context context, List list) {
        this.list = list;
        this.layoutInflater = LayoutInflater.from(context);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder;
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = layoutInflater.inflate(R.layout.adapter_main_lv_item, parent, false);
            viewHolder.tvTimer = (TextView) convertView.findViewById(R.id.tv_timer);
            viewHolder.tvName = (TextView) convertView.findViewById(R.id.tv_name);

            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        viewHolder.tvName.setText(list.get(position).getName());

        if (!list.get(position).getTime().equals("时间到")) {
            //将一个int类型的数值转换成时间格式
            int tempTime = Integer.parseInt(list.get(position).getTime());
            //SSS为毫秒，如果精确到时分秒改成HH:mm:ss即可
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("mm:ss:SSS");
            Date date = new Date(tempTime);
            String time = simpleDateFormat.format(date);
            //因为1秒是等于1000毫秒的，正常显示格式为05:40:99,所以此处截取掉最后一位数字
            viewHolder.tvTimer.setText(time.substring(0, time.length() - 1));
        } else {
            viewHolder.tvTimer.setText(list.get(position).getTime());
        }
        return convertView;
    }

    public class ViewHolder {
        TextView tvTimer;
        TextView tvName;
    }

    int result = 0;
    private Thread thread;

    public void start() {
        thread = new Thread() {
            public void run() {
                while (true) {
                    try {
                        if (list == null || result == list.size()) {
                            break;
                        }
                        sleep(1);
                        for (Person person : list) {
                            if (!"时间到".equals(person.getTime())) {
                                if ("1".equals(person.getTime())) {
                                    person.setTime("时间到");
                                    result++;
                                } else {
                                    person.setTime((Integer.parseInt(person.getTime()) - 1) + "");
                                }
                            }
                        }
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        };
        thread.start();
    }
}

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