android中怎么实现条目倒计时功能

本篇文章为大家展示了android中怎么实现条目倒计时功能，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。

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; }}

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