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:
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< 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:
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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:
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/** * @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
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/** * @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服务器之家。
原文链接:https://blog.csdn.net/like15835551521/article/details/80163597