Android使用Recyclerview实现图片水平自动循环滚动效果

<?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="match_parent"  android:orientation="vertical">  <ImageView    android:layout_width="300dp"    android:layout_height="350dp"    android:layout_gravity="center_horizontal"    android:id="@+id/img"    android:src="@drawable/p5"    android:scaleType="fitXY"    />    <android.support.v7.widget.RecyclerView      android:layout_width="match_parent"      android:layout_height="150dp"      android:layout_marginTop="10dp"      android:id="@+id/recyclerview"      ></android.support.v7.widget.RecyclerView></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="wrap_content"  android:layout_height="match_parent"  android:orientation="vertical"  >  <ImageView    android:layout_width="100dp"    android:layout_height="match_parent"    android:id="@+id/img"    android:layout_marginLeft="5dp"    android:layout_marginRight="5dp"    android:scaleType="fitXY"    /></LinearLayout>

public class HorizontalActivity extends AppCompatActivity implements RecyAdapter.OnItemClickListener {  private String TAG="HorizontalActivity";  @BindView(R.id.img)  ImageView img;  @BindView(R.id.recyclerview)  RecyclerView recyclerview;  private Integer[] mImgIds = {R.drawable.p1, R.drawable.p2, R.drawable.p3, R.drawable.p4, R.drawable.p5,      R.drawable.pic1, R.drawable.pic5, R.drawable.pic6};  private List<Integer> datas;  private RecyAdapter recyAdapter;  private Handler mHandler=new Handler();  private LinearLayoutManager layoutManager;  private int oldItem=0;  @Override  protected void onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_recy);    ButterKnife.bind(this);    initData();    initRecy();    img.setImageResource(datas.get(0));    recyAdapter.setOnItemClickListener(this);  }  Runnable scrollRunnable=new Runnable() {    @Override    public void run() {      recyclerview.scrollBy(3,0);//      int firstItem = layoutManager.findFirstVisibleItemPosition();      int firstItem=layoutManager.findFirstVisibleItemPosition();      if(firstItem!=oldItem&&firstItem>0){        oldItem=firstItem;        img.setImageResource(datas.get(oldItem%datas.size()));      }      Log.e(TAG, "run: firstItem:"+firstItem );      mHandler.postDelayed(scrollRunnable,10);    }  };  private void initRecy() {    recyAdapter=new RecyAdapter(this,datas);    layoutManager = new LinearLayoutManager(this);    layoutManager.setOrientation(LinearLayoutManager.HORIZONTAL);    recyclerview.setLayoutManager(layoutManager);    recyclerview.setAdapter(recyAdapter);  }  private void initData() {    datas=new ArrayList<>();    for (int i = 0; i <mImgIds.length ; i++) {      datas.add(mImgIds[i]);    }  }  @Override  protected void onResume() {    super.onResume();    mHandler.postDelayed(scrollRunnable,10);  }  @Override  protected void onStop() {    super.onStop();    mHandler.removeCallbacks(scrollRunnable);  }  @Override  public void onItemClick(View view, int tag) {    Toast.makeText(this,"第"+tag+"张图片被点击了",Toast.LENGTH_SHORT).show();  }}

public class RecyAdapter extends RecyclerView.Adapter<RecyAdapter.ViewHolder> implements View.OnClickListener {  private Context context;  private List<Integer> datas;  private OnItemClickListener onItemClickListener;  public RecyAdapter(Context context, List<Integer> datas) {    this.context = context;    this.datas = datas;  }  @Override  public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {    View view = LayoutInflater.from(context).inflate(R.layout.item_horizontal, parent, false);    ViewHolder vh=new ViewHolder(view);    view.setOnClickListener(this);    return vh;  }  @Override  public void onBindViewHolder(ViewHolder holder, int position) {    int newPos=position%datas.size();    holder.img.setImageResource(datas.get(newPos));    holder.itemView.setTag(position);  }  @Override  public int getItemCount() {    return Integer.MAX_VALUE;  }  @Override  public void onClick(View view) {    if(onItemClickListener!=null){      onItemClickListener.onItemClick(view, (Integer) view.getTag());    }  }  class ViewHolder extends RecyclerView.ViewHolder {     ImageView img;    public ViewHolder(View itemView) {      super(itemView);      img=itemView.findViewById(R.id.img);    }  }  public void setOnItemClickListener(OnItemClickListener listener){    this.onItemClickListener=listener;  }  interface OnItemClickListener{    void onItemClick(View view,int tag);  }}