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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。
本文标题: android实现条目倒计时功能
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