最近需要实现抽奖功能，就需要把中奖的信息，以垂直循环滚动的形式向用户进行展示，这篇主要是使用RecyclerView实现垂直滚动效果，九宫格抽奖功能会在后期写，那现在就来看看实现的过程吧。
实现步骤：
1.效果图展示
2.自定义实现滚动效果RecyclerView
3.适配器Adapter实现
4.适配器布局文件
5.主程序调用过程
6.主布局文件
7.总结
实现过程：
1.效果图展示
在这里插入图片描述
2.自定义实现滚动效果RecyclerView
public class AutoPollRecyclerView extends RecyclerView {
private static final long TIME_AUTO_POLL = 16;
AutoPollTask autoPollTask;
private boolean running; //标示是否正在自动轮询
private boolean canRun;//标示是否可以自动轮询,可在不需要的是否置false
public AutoPollRecyclerView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
autoPollTask = new AutoPollTask(this);
}
static class AutoPollTask implements Runnable {
private final WeakReference<AutoPollRecyclerView> mReference;
//使用弱引用持有外部类引用->防止内存泄漏
public AutoPollTask(AutoPollRecyclerView reference) {
this.mReference = new WeakReference<AutoPollRecyclerView>(reference);
}
@Override
public void run() {
AutoPollRecyclerView recyclerView = mReference.get();
if (recyclerView != null && recyclerView.running && recyclerView.canRun) {
recyclerView.scrollBy(2, 2);
recyclerView.postDelayed(recyclerView.autoPollTask, recyclerView.TIME_AUTO_POLL);
}
}
}
//开启:如果正在运行,先停止->再开启
public void start() {
if (running)
stop();
canRun = true;
running = true;
postDelayed(autoPollTask, TIME_AUTO_POLL);
}
public void stop() {
running = false;
removeCallbacks(autoPollTask);
}
@Override
public boolean onTouchEvent(MotionEvent e) {
switch (e.getAction()) {
case MotionEvent.ACTION_DOWN:
if (running)
stop();
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_OUTSIDE:
if (canRun)
start();
break;
}
//return false，注释掉onTouchEvent()方法里面的stop和start方法，则列表自动滚动且不可触摸
return super.onTouchEvent(e);}
}
3.适配器Adapter实现
public class AutoPollAdapter extends RecyclerView.Adapter<AutoPollAdapter.BaseViewHolder> {
private final Context mContext;
private final List<AutoScrollLuckyListReq.DatasBean> mData;
public AutoPollAdapter(Context context, List<AutoScrollLuckyListReq.DatasBean> list) {
this.mContext = context;
this.mData = list;
}
@Override
public BaseViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.auto_list_item, parent, false);
BaseViewHolder holder = new BaseViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(BaseViewHolder holder, int position) {
AutoScrollLuckyListReq.DatasBean datasBean = mData.get(position % mData.size());
holder.content.setText(datasBean.getPhone() + " 获得 " + datasBean.getGiftName());
}
@Override
public int getItemCount() {
return Integer.MAX_VALUE;
}
class BaseViewHolder extends RecyclerView.ViewHolder {
TextView content;
public BaseViewHolder(View itemView) {
super(itemView);
content = itemView.findViewById(R.id.content);
}
}
}
4.适配器布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#fffcf5"
android:orientation="vertical">
<TextView
android:id="@+id/content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="135xxxx8888 获得 8积分"
android:layout_marginTop="8dp"
android:layout_marginBottom="8dp"
android:textColor="#797762"
android:textSize="14dp" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#797762"/>
</LinearLayout>
5.主程序调用过程
public class MainActivity extends AppCompatActivity {
private AutoPollRecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
initListener();
}
private void initView() {
recyclerView = findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false));//设置LinearLayoutManager.HORIZONTAL 则水平滚动
}
private void initData() {
String reponse = "{\n" +
" \"datas\": [\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"三花便签（20枚）\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"三花便签（20枚）\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"三花便签（20枚）\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"三花便签（20枚）\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"满10减1元\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" },\n" +
" {\n" +
" \"giftName\": \"20个积分\",\n" +
" \"phone\": \"****\"\n" +
" }\n" +
" ],\n" +
" \"msg\": \"success\",\n" +
" \"ret\": 0\n" +
"}";
AutoScrollLuckyListReq autoScrollLuckyListReq = new Gson().fromJson(reponse, AutoScrollLuckyListReq.class);
//0为请求成功
if (autoScrollLuckyListReq.getRet() == 0) {
AutoPollAdapter autoPollAdapter = new AutoPollAdapter(getApplicationContext(), autoScrollLuckyListReq.getDatas());
recyclerView.setAdapter(autoPollAdapter);
//启动滚动
recyclerView.start();
}
}
private void initListener() {
}
}
6.主布局文件
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_marginLeft="15dp"
android:layout_marginTop="15dp"
android:layout_centerInParent="true"
android:layout_marginRight="15dp"
android:background="@drawable/luckyer_bg">
<RelativeLayout
android:layout_width="40dp"
android:layout_height="wrap_content"
android:layout_marginLeft="23dp"
android:layout_marginTop="1dp"
android:layout_marginBottom="1dp"
android:background="#fff6ea">
<ImageView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_centerInParent="true"
android:padding="10dp"
android:src="@drawable/zhongjiangzhemingdan" />
</RelativeLayout>
<com.showly.autopollrecyclerviewdemo.view.AutoPollRecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp" />
</LinearLayout>
</RelativeLayout>
7.总结
类似中奖信息自动滚动效果到这里就实现了，实现过程还是相对比较简单的，重点在于自定义RecyclerView的实现处理。
需要Demo源码的童鞋可以在底部公众号回复："自动滚动效果" 即可获取
以下是公众号(longxuanzhigu)，之后发布的文章会同步到该公众号，方便交流学习Android知识及分享个人爱好文章：
在这里插入图片描述
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