RecycleView 实现复杂首页布局

使用特殊的(自定义)布局管理器

GridLayoutManager为我们提供了动态改变每个item所占列数的方法：

gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
       @Override
       public int getSpanSize(int position) {
          return gridManager.getSpanCount();
       }
}
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先看效果图：

这里写图片描述

实现源码

第一行布局item_first_row.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="240dp"
    android:layout_height="120dp">

    <RelativeLayout
        android:id="@+id/text_view1"
        android:layout_width="116dp"
        android:layout_height="116dp"
        android:layout_marginBottom="2dp"
        android:layout_marginLeft="2dp"
        android:layout_marginRight="2dp"
        android:layout_marginTop="2dp"
        android:background="@drawable/selector"
        android:clickable="true"
        android:focusable="true"
        android:focusableInTouchMode="true"
        android:orientation="vertical">

        <ImageView
            android:layout_width="match_parent"
            android:layout_height="80dp"
            android:layout_alignParentTop="true"
            android:scaleType="fitCenter"
            android:src="@drawable/icon" />

        <TextView
            android:id="@+id/text_view"
            android:layout_width="match_parent"
            android:layout_height="20dp"
            android:layout_alignParentBottom="true"
            android:gravity="center" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/text_view2"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_toEndOf="@id/text_view1">

        <include layout="@layout/item_other_row" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/text_view3"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_toEndOf="@id/text_view2">

        <include layout="@layout/item_other_row" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/text_view4"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_toEndOf="@id/text_view1">

        <include layout="@layout/item_other_row" />
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/text_view5"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_toEndOf="@id/text_view4">

        <include layout="@layout/item_other_row" />
    </RelativeLayout>
</RelativeLayout>
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其他行布局item_other_row.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="60dp"
    android:layout_marginBottom="2dp"
    android:layout_marginLeft="2dp"
    android:layout_marginRight="2dp"
    android:layout_marginTop="2dp"
    android:background="@drawable/selector"
    android:clickable="true"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:gravity="center"
    android:orientation="vertical">

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:scaleType="fitCenter"
        android:src="@drawable/icon"
        android:layout_alignParentTop="true"/>

    <TextView
        android:id="@+id/text_view"
        android:layout_width="match_parent"
        android:layout_height="16dp"
        android:gravity="center"
        android:layout_alignParentBottom="true"/>
</RelativeLayout>
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设置LayoutManager，实现adapter

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRecyclerView = findViewById(R.id.recycler_view);

        mRecyclerView.setLayoutManager(new GridLayoutManager(this, 4));//这里用线性显示 类似于listview
        //mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));//这里用线性宫格显示 类似于grid view
        //mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3, OrientationHelper.VERTICAL));//这里用线性宫格显示 类似于瀑布流
        mRecyclerView.setAdapter(new NormalRecyclerViewAdapter(this));
    }

    class NormalRecyclerViewAdapter extends RecyclerView.Adapter<NormalRecyclerViewAdapter.NormalTextViewHolder> {
        private final int ITEM_TYPE_HEADER = 1;
        private final int ITEM_TYPE_OTHER = 2;

        private final LayoutInflater mLayoutInflater;
        private final Context mContext;
        private String[] mTitles;

        private NormalRecyclerViewAdapter(Context context) {
            mTitles = context.getResources().getStringArray(R.array.titles);
            mContext = context;
            mLayoutInflater = LayoutInflater.from(context);
        }

        @Override
        public void onAttachedToRecyclerView(final RecyclerView recyclerView) {
            super.onAttachedToRecyclerView(recyclerView);

            RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();
            if (manager instanceof GridLayoutManager) {
                final GridLayoutManager gridManager = ((GridLayoutManager) manager);
                gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
                    @Override
                    public int getSpanSize(int position) {
                        int type = getItemViewType(position);
                        switch (type) {
                            case ITEM_TYPE_HEADER:
                                return 4;
                            case ITEM_TYPE_OTHER:
                                return 1;
                            default:
                                return 1;
                        }
                    }
                });
            }
        }

        @Override
        public NormalTextViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            if (viewType == ITEM_TYPE_HEADER) {
                return new NormalTextViewHolder(mLayoutInflater.inflate(R.layout.item_first_row, parent, false));
            } else {
                return new NormalTextViewHolder(mLayoutInflater.inflate(R.layout.item_other_row, parent, false));
            }
        }

        @Override
        public int getItemViewType(int position) {
            if (position == 0) {
                return ITEM_TYPE_HEADER;
            } else {
                return ITEM_TYPE_OTHER;
            }
        }

        @Override
        public void onBindViewHolder(NormalRecyclerViewAdapter.NormalTextViewHolder holder, int position) {
            if (position == 0) {
                int size = mTitles.length >= 5 ? 5 : mTitles.length;
                for (int i = 0; i < size; i++) {
                    holder.mTextViews.get(i).setText(mTitles[i]);
                }
                for (int i =size;i<5;i++){
                    ((View)holder.mTextViews.get(i).getParent()).setVisibility(View.INVISIBLE);
                }
            } else {
                holder.mTextView.setText(mTitles[position+4]);
            }
        }

        @Override
        public int getItemCount() {
            if (mTitles == null) {
                return 0;
            } else if (mTitles.length <= 5) {
                return 1;
            } else {
                return mTitles.length - 4;
            }
        }

        class NormalTextViewHolder extends RecyclerView.ViewHolder {
            private View mRoot;
            private TextView mTextView;
            private List<TextView> mTextViews = new ArrayList<>();

            NormalTextViewHolder(View view) {
                super(view);
                mRoot = view;
                if (view.findViewById(R.id.text_view1) != null) {
                    mTextViews.add((TextView) view.findViewById(R.id.text_view1).findViewById(R.id.text_view));
                    mTextViews.add((TextView) view.findViewById(R.id.text_view2).findViewById(R.id.text_view));
                    mTextViews.add((TextView) view.findViewById(R.id.text_view3).findViewById(R.id.text_view));
                    mTextViews.add((TextView) view.findViewById(R.id.text_view4).findViewById(R.id.text_view));
                    mTextViews.add((TextView) view.findViewById(R.id.text_view5).findViewById(R.id.text_view));
                } else {
                    mTextView = view.findViewById(R.id.text_view);
                }
            }
        }
    }
}
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参考文章：
http://blog.csdn.net/liaoinstan/article/details/52671101
http://blog.csdn.net/xx326664162/article/details/61199895

--------------------- 本文来自 随风飘飘420 的CSDN 博客 ，全文地址请点击：https://blog.csdn.net/miaomiao12345678/article/details/77621805?utm_source=copy

posted @ 2018-10-07 21:41  天涯海角路  阅读(415)  评论(0)    收藏  举报