android实现条目倒计时功能

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context="com.example.rui.demo.list_count_down.ListCountDownActivity" 

 <android.support.v7.widget.RecyclerView
 android:id="@+id/rv_list_count_down"
 android:layout_width="match_parent"
 android:layout_height="match_parent" 

 </android.support.v7.widget.RecyclerView 
</FrameLayout 

public class ListCountDownActivity extends AppCompatActivity {

 RecyclerView mRecyclerView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_list_count_down);
 initView();

 }

 private void initView() {
 mRecyclerView = (RecyclerView) findViewById(R.id.rv_list_count_down);
 mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
 CountDownAdapter adapter = new CountDownAdapter();
 mRecyclerView.setAdapter(adapter);
 List<DataInfo  list = new ArrayList< ();
 for (int i = 1; i < 101; i++) {
  list.add(new DataInfo("我是条目" + i, i * 100));
 }
 adapter.setmDatas(list);
 }
}

/**
* @Date 2018/4/26
* @Introduction 倒计时条目适配器
*/
public class CountDownAdapter extends RecyclerView.Adapter<CountDownAdapter.MyViewHoder  {
private final String TAG = CountDownAdapter.class.getSimpleName();
private final int STOP = 0x01;
private final int START = 0x02;
private final int LOOP = 0x03;
private List<DataInfo  mDatas;
public CountDownAdapter() {
}
public void setmDatas(List<DataInfo  mDatas) {
this.mDatas = mDatas;
notifyDataSetChanged();
}
@Override
public MyViewHoder onCreateViewHolder(ViewGroup parent, int viewType) {
return new MyViewHoder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_count_down, parent, false));
}
@Override
public void onBindViewHolder(final MyViewHoder holder, int position) {
final DataInfo info = mDatas.get(position);
holder.tvName.setText(info.getName());
holder.tvTime.setText(info.getTime() + "");
if (info.isCountDown()) {
holder.btnStart.setText("停止");
} else {
holder.btnStart.setText("开始");
}
holder.btnStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Message msg = Message.obtain();
if (!info.isCountDown()) {
holder.btnStart.setText("停止");
msg.what = START;
} else {
holder.btnStart.setText("开始");
msg.what = STOP;
}
msg.obj = info;
mHandler.sendMessage(msg);
info.setCountDown(!info.isCountDown());
}
});
}
@Override
public int getItemCount() {
return mDatas == null ? 0 : mDatas.size();
}
static class MyViewHoder extends RecyclerView.ViewHolder {
private final TextView tvName;
private final TextView tvTime;
private final Button btnStart;
public MyViewHoder(View itemView) {
super(itemView);
tvName = (TextView) itemView.findViewById(R.id.tv_name_count_down_item);
tvTime = (TextView) itemView.findViewById(R.id.tv_time_count_down_item);
btnStart = (Button) itemView.findViewById(R.id.btn_time_count_down_item);
}
}
private Handler mHandler = new Handler() {
private List<DataInfo  mCountDownList = new ArrayList< ();
@Override
public void handleMessage(Message msg) {
setChange(msg);
}
private synchronized void setChange(Message msg) {
switch (msg.what) {
case STOP:
DataInfo stopInfo = (DataInfo) msg.obj;
Log.e(TAG, "------------stop:" + stopInfo.getName());
mCountDownList.remove(stopInfo);
notifyDataSetChanged();
if (mCountDownList.size() <= 0) {
mHandler.removeCallbacksAndMessages(null);
}
break;
case START:
DataInfo startInfo = (DataInfo) msg.obj;
Log.e(TAG, "------------start:" + startInfo.getName());
if (startInfo.getTime()   0) {
mCountDownList.add(startInfo);
mHandler.sendEmptyMessageDelayed(LOOP, 1000);
}
break;
case LOOP:
if (mCountDownList.size() <= 0) {
return;
}
for (Iterator<DataInfo  iterator = mCountDownList.iterator(); iterator.hasNext(); ) {
DataInfo dataInfo = iterator.next();
int time = dataInfo.getTime();
time--;
dataInfo.setTime(time);
if (time <= 0) {
iterator.remove();
}
}
notifyDataSetChanged();
mHandler.removeCallbacksAndMessages(null);
mHandler.sendEmptyMessageDelayed(LOOP, 1000);
break;
default:
break;
}
}
};
}

/**
* @Date 2018/4/26
* @Introduction 倒计时数据实体类
*/
public class DataInfo {
private String name;
private int time;
private boolean isCountDown = false;
public DataInfo(String name, int time) {
this.name = name;
this.time = time;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getTime() {
return time;
}
public void setTime(int time) {
this.time = time;
}
public boolean isCountDown() {
return isCountDown;
}
public void setCountDown(boolean countDown) {
isCountDown = countDown;
}
}