android实现条目倒计时功能

网上对于这样的功能已经是泛滥成河了，但是最近遇到这样的一个需求，还是要值得我们学习一下，并将他记录下来。

布局文件：

<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>

Activity界面：

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);
 }
}

倒计时条目适配器：

/**
 * @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;
   }
  }
 };
}

JavaBean类

/**
 * @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;
 }
}

以上就是条目中倒计时的一个小Demo。

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