解析Android 中使用RecyclerView实现底部翻页的操作方法

<?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:orientation="horizontal"> <LinearLayout android:id="@+id/bottom_ll_content" android:layout_gravity="center_vertical" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center_vertical" android:layout_marginLeft="10px" android:layout_marginRight="10px" android:layout_marginTop="10px" android:orientation="horizontal"> <Button  android:id="@+id/pre_page"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_marginRight="@dimen/y5"  android:paddingBottom="@dimen/x4"  android:paddingLeft="@dimen/y5"  android:paddingRight="@dimen/y5"  android:paddingTop="@dimen/x4"  android:text="上一页"  android:textSize="@dimen/middlesize"/> <android.support.v7.widget.RecyclerView  android:id="@+id/recycler"  android:layout_width="wrap_content"  android:layout_height="wrap_content"/> <Button  android:id="@+id/next_page"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_marginLeft="@dimen/y5"  android:paddingBottom="@dimen/x4"  android:paddingLeft="@dimen/y5"  android:paddingRight="@dimen/y5"  android:paddingTop="@dimen/x4"  android:text="下一页"  android:textSize="@dimen/middlesize"/> </LinearLayout></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:orientation="vertical"  android:layout_width="wrap_content"  android:layout_height="wrap_content"> <RadioButton android:id="@+id/bottom_item_rb" android:layout_width="wrap_content" android:text="1" android:gravity="center_vertical" android:background="@drawable/tab_select" android:layout_height="wrap_content"/></LinearLayout>BottomPagerView 代码：public class BottomPagerView extends LinearLayout { private final LinearLayout ll_content; private int pageSize = 0; private Button pre_page; private Button next_page; private RecyclerView recycler; private BottomAdapter mBottomAdapter; Context mContent; private boolean mShouldScroll = false; private int mToPosition = 0; private int smoothWidth = 0; public BottomPagerView(Context context) { this(context, null); } public BottomPagerView(Context context, @Nullable AttributeSet attrs) { super(context, attrs); this.mContent = context; LayoutInflater.from(context).inflate(R.layout.bottom_page, this, true); ll_content = (LinearLayout) findViewById(R.id.bottom_ll_content); pre_page = (Button) findViewById(R.id.pre_page); next_page = (Button) findViewById(R.id.next_page); recycler = (RecyclerView) findViewById(R.id.recycler); /*initView(context);*/ } public BottomPagerView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { this(context, attrs); } private int currentPage = 0; public void initView(final Context context) { if (pageSize == 0) {  ll_content.setVisibility(INVISIBLE); } else {  ll_content.setVisibility(VISIBLE);  final List<BottomBean> list = new ArrayList<>();  for (int i = 0; i < pageSize; i++) {  BottomBean bean = new BottomBean();  bean.setPosition(i);  if (i == 0) {   bean.setSelect(true);  } else {   bean.setSelect(false);  }  list.add(bean);  }  final LinearLayoutManager manager = new LinearLayoutManager(context);  manager.setOrientation(LinearLayoutManager.HORIZONTAL);  recycler.setLayoutManager(manager);  int width = 0;  if (pageSize > 8) {  int pixelSize = getResources().getDimensionPixelSize(R.dimen.y6);  width = pixelSize * 10;  } else {  width = LayoutParams.WRAP_CONTENT;  }  LayoutParams params = new LayoutParams(width, ViewGroup.LayoutParams.WRAP_CONTENT);  recycler.setLayoutParams(params);  mBottomAdapter = new BottomAdapter(context, list);  recycler.setAdapter(mBottomAdapter);  mBottomAdapter.setCurPage(new BottomAdapter.getCurPage() {  @Override  public void serCurPage(int p) {   list.get(currentPage).setSelect(false);   list.get(p).setSelect(true);   mBottomAdapter.notifyDataSetChanged();   currentPage = p;   smoothMoveToPosition(recycler, p);   recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {   @Override   public void onScrollStateChanged(RecyclerView recyclerView, int newState) {    super.onScrollStateChanged(recyclerView, newState);    if (mShouldScroll){    mShouldScroll = false;    smoothMoveToPosition(recycler,mToPosition);    }   }   });   if (Curpage != null) {   Curpage.serCurPage(p);   }  }  });  pre_page.setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {   if (currentPage > 0) {   int page = currentPage - 1;   list.get(currentPage).setSelect(false);   list.get(page).setSelect(true);   currentPage = page;   mBottomAdapter.notifyDataSetChanged();   smoothMoveToPosition(recycler, page);   recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {    @Override    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {    super.onScrollStateChanged(recyclerView, newState);    if (mShouldScroll){     mShouldScroll = false;     smoothMoveToPosition(recycler,mToPosition);    }    }   });   if (Curpage != null) {    Curpage.serCurPage(page);   }   } else {   return;   }  }  });  next_page.setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {   if (currentPage < pageSize - 1) {   list.get(currentPage).setSelect(false);   int page = currentPage + 1;   Log.d("BottomPagerView", "onClick: " + page);   list.get(page).setSelect(true);   currentPage = page;   mBottomAdapter.notifyDataSetChanged();   smoothMoveToPosition(recycler, page);   recycler.addOnScrollListener(new RecyclerView.OnScrollListener() {    @Override    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {    super.onScrollStateChanged(recyclerView, newState);    if (mShouldScroll){     mShouldScroll = false;     smoothMoveToPosition(recycler,mToPosition);    }    }   });   if (Curpage != null) {    Curpage.serCurPage(page);   }   } else {   return;   }  }  }); } } public void setPageSize(int size) { this.pageSize = size; initView(mContent); } private getCurPage Curpage; public interface getCurPage { void serCurPage(int p); } public void setCurPage(getCurPage page) { this.Curpage = page; } private void smoothMoveToPosition(RecyclerView mRecyclerView, final int position) { int firstItem = mRecyclerView.getChildLayoutPosition(mRecyclerView.getChildAt(0)); int lastItem = mRecyclerView.getChildLayoutPosition(mRecyclerView.getChildAt(mRecyclerView.getChildCount()-1 )); Log.d("BottomPagerView", "smoothMoveToPosition: firstItem"+firstItem+" lastItem "+lastItem+" position"+position); if (position < firstItem) {  mRecyclerView.smoothScrollToPosition(position);  mShouldScroll = true;  mToPosition = position; } else if (position <= lastItem) {// 跳转位置在第一个可见项之后，最后一个可见项之前// smoothScrollToPosition根本不会动，此时调用smoothScrollBy来滑动到指定位置  int movePosition = position - firstItem;  if (movePosition >= 0 && movePosition <= mRecyclerView.getChildCount()) {  int top = mRecyclerView.getChildAt(movePosition).getLeft();  int width = mRecyclerView.getMeasuredWidth() / 2;  int scroll = top - width+mRecyclerView.getChildAt(movePosition).getMeasuredWidth()/2;  Log.d("BottomPagerView", "smoothMove: "+scroll);  mRecyclerView.smoothScrollBy(scroll, 0);  } } else {  mRecyclerView.smoothScrollToPosition(position);  mShouldScroll = true;  mToPosition = position; } }}BottomAdapter adapter：public class BottomAdapter extends RecyclerView.Adapter<BottomAdapter.MyViewHolder> { Context mContext; List<BottomBean> size; private boolean isFirst = true; private int currentPage = 0; public BottomAdapter(Context context, List<BottomBean> size) { this.mContext = context; this.size = size; } @Override public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { View view = View.inflate(mContext, R.layout.bottom_item, null); return new MyViewHolder(view); } @Override public void onBindViewHolder(final MyViewHolder holder, final int position) { holder.rb.setButtonDrawable(null); holder.rb.setText(position + 1 + ""); holder.rb.setTag(position); holder.rb.setChecked(size.get(position).isSelect()); holder.rb.setOnClickListener(new View.OnClickListener() {  @Override  public void onClick(View v) {  if (!size.get((int) holder.rb.getTag()).isSelect()){   Curpage.serCurPage((int) holder.rb.getTag());  }  } }); } @Override public int getItemCount() { return size.size(); } class MyViewHolder extends RecyclerView.ViewHolder { private final RadioButton rb; public MyViewHolder(View itemView) {  super(itemView);  rb = (RadioButton) itemView.findViewById(R.id.bottom_item_rb); } } private getCurPage Curpage; public interface getCurPage { void serCurPage(int p); } public void setCurPage(getCurPage page) { this.Curpage = page; }}

<BottomPagerView android:id="@+id/part_part_tab" android:layout_width="wrap_content" android:layout_below="@+id/part_part_recycler" android:layout_height="wrap_content" android:layout_gravity="center_horizontal" android:layout_marginBottom="5dp"/>

mBottomPagerView.setPageSize(AllPage);

mBottomPagerView.setCurPage(new BottomPagerView.getCurPage() { @Override public void serCurPage(int p) { //获取点击的页码数，操作 }});