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Android RecyclerView优雅实现复杂列表布局(二)

程序员文章站 2022-06-08 19:06:48
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转载:https://blog.csdn.net/huang3513/article/details/62046528

前言

学习了(一)中那个RecyclerView的一些基础知识,如果没有具体看懂可以再返回看不一样的RecyclerView优雅实现复杂列表布局(一),那么接下来我们就在(一)的基础之上,完善稍微复杂一点数据处理。

不一样的RecyclerView优雅实现复杂列表布局(二)中使用的是GridLayoutManager模式,实现混合使用的效果: 
Android RecyclerView优雅实现复杂列表布局(二)

1.首先加载的数据要有所改变,多种形式的数据加载,在MainActivity中模拟出三个数据集合,并根据Adapter中的方法,添加进去。

 /**
     * 此处主要是模拟数据。方便我们测试
     */
    private void initData() {
        //创建三个数据集合来模拟数据的展示
        ArrayList<DataModeOne> list1 = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            DataModeOne data = new DataModeOne();
            data.avatarColor = colors[0];
            data.name = "name : "+ 1;
            list1.add(data);
        }

        ArrayList<DataModeTwo> list2 = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            DataModeTwo data = new DataModeTwo();
            data.avatarColor = colors[1];
            data.name = "name : "+ 1;
            data.content = "content";
            list2.add(data);
        }

        ArrayList<DataModeThree> list3 = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            DataModeThree data = new DataModeThree();
            data.avatarColor = colors[2];
            data.name = "name : "+ 1;
            data.content = "content";
            data.contentColor = colors[2];
            list3.add(data);
        }

        /**
         * 把数据添加到Adapter中去
         */
        mAdapter.addList(list1,list2,list3);
        mAdapter.notifyDataSetChanged();
    }

然后模拟出三个实体类,来储存三种类型的数据,虽然和之前的相似,但有所改动:

/**
 * @author :huangxianfeng on 2017/3/14.
 * 为了实现三种不同类型的数据类型
 * 此处虽名称相同,实际中是不同的
 */
public class DataModeOne {

    public int avatarColor;

    public String name;
}
/**
 * @author :huangxianfeng on 2017/3/14.
 * 为了实现三种不同类型的数据类型
 * 此处虽名称相同,实际中是不同的
 */
public class DataModeTwo {

    public int avatarColor;

    public String name;

    public String content;

}
/**
 * @author :huangxianfeng on 2017/3/14.
 * 为了实现三种不同类型的数据类型
 * 此处虽名称相同,实际中是不同的
 */
public class DataModeThree {

    public int avatarColor;

    public String name;

    public String content;

    public int contentColor;
}

2.Holder改动的时候,采用了泛型,在TypeAbstractViewHolder类中加入泛型,然后传入不同的数据实体:

/**
 * @author :huangxianfeng on 2017/3/14.
 * ViewHolder基类
 * 每一种布局都封装成一个ViewHolder,继承此类实现BindHolder方法
 */
public abstract class TypeAbstractViewHolder<T> extends RecyclerView.ViewHolder{

    public TypeAbstractViewHolder(View itemView) {
        super(itemView);
    }

    public abstract void bindHolder(T model);
}

此处贴出一例:

/**
 * @author :huangxianfeng on 2017/3/14.
 */
public class TypeOneViewHolder extends TypeAbstractViewHolder<DataModeOne> {

    public ImageView avatar;
    public TextView name;
    public TypeOneViewHolder(View itemView) {
        super(itemView);
        avatar = (ImageView)itemView.findViewById(R.id.avatar);
        name = (TextView)itemView.findViewById(R.id.name);
        itemView.setBackgroundColor(Color.BLACK);
    }
    @Override
    public void bindHolder(DataModeOne model){
        avatar.setBackgroundResource(model.avatarColor);
        name.setText(model.name);
    }
}

3.在Holder改造完成之后,那么我们看看Adapter的改造:

**
 * @author :huangxianfeng on 2017/3/14.
 * RecyclerView的适配器
 */
public class DemoAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {

    public static final int TYPE_ONE = 1;
    public static final int TYPE_TWO = 2;
    public static final int TYPE_THREE = 3;

    private LayoutInflater mLayoutInflater;

    public DemoAdapter(Context context) {
        mLayoutInflater = LayoutInflater.from(context);
    }

    private ArrayList<DataModeOne> list1;
    private ArrayList<DataModeTwo> list2;
    private ArrayList<DataModeThree> list3;
    private ArrayList<Integer> types = new ArrayList<>();
    private Map<Integer,Integer> mPosition = new HashMap<>();

    /**
     * 创建一个方法供外面操作此数据
     */
    public void addList(ArrayList<DataModeOne> list1,ArrayList<DataModeTwo> list2,ArrayList<DataModeThree> list3){
        addListByType(TYPE_ONE,list1);
        addListByType(TYPE_TWO,list2);
        addListByType(TYPE_THREE,list3);

        this.list1 = list1;
        this.list2 = list2;
        this.list3 = list3;
    }

    private void addListByType(int type,ArrayList list){
        mPosition.put(type,types.size());
        for (int i = 0; i < list.size(); i++) {
            types.add(type);
        }
    }

    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        switch (viewType){
            case DataModel.TYPE_ONE:
                return new TypeOneViewHolder(mLayoutInflater.inflate(R.layout.item_type_one,parent,false));
            case DataModel.TYPE_TWO:
                return new TypeTwoViewHolder(mLayoutInflater.inflate(R.layout.item_type_two,parent,false));
            case DataModel.TYPE_THREE:
                return new TypeThreeViewHolder(mLayoutInflater.inflate(R.layout.item_type_three,parent,false));
        }
        return null;
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
        int viewType = getItemViewType(position);
        int realPosition = position -mPosition.get(viewType);
        switch (viewType){
            case DataModel.TYPE_ONE:
                ((TypeOneViewHolder)holder).bindHolder(list1.get(realPosition));
                break;
            case DataModel.TYPE_TWO:
                ((TypeTwoViewHolder)holder).bindHolder(list2.get(realPosition));
                break;
            case DataModel.TYPE_THREE:
                ((TypeThreeViewHolder)holder).bindHolder(list3.get(realPosition));
                break;
        }
    }

    /**
     * 多种布局时候至关重要的方法
     * @param position
     * @return
     */
    @Override
    public int getItemViewType(int position) {
        //得到不同的布局类型
        return types.get(position);
    }

    @Override
    public int getItemCount() {
        return types.size();
    }
}

变动不是很大,就是在onBindViewHolder()方法中添加单个Holder的获取。

4.其中MainActivity中,给RecyclerView添加一个方法实现间距重新赋值:

        /**
         * 设置RecyclerView的间距
         * 这样可以实现Grid和RecyclerView单条显示时,很好的区分开
         */
        mRecyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
            @Override
            public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                GridLayoutManager.LayoutParams layoutParams = (GridLayoutManager.LayoutParams)view.getLayoutParams();
                int spanSize = layoutParams.getSpanSize();
                int spanIndex = layoutParams.getSpanIndex();
                outRect.top = 20;
                /**
                 * 不相等时说明是Grid形式显示的
                 * 然后判断是左边还有右边显示,分别设置间距为10
                 */
                if (spanSize!=gridLayoutManager.getSpanCount()){
                    if (spanIndex ==1){
                        outRect.left = 10;
                    }else{
                        outRect.right = 10;
                    }
                }
            }
        });

MainActivity全部代码:

public class MainActivity extends AppCompatActivity {
    private RecyclerView mRecyclerView;
    private DemoAdapter mAdapter;
    /**
     * 随机一下颜色
     */
    int colors[] ={android.R.color.holo_red_dark,
            android.R.color.holo_blue_dark,
            android.R.color.holo_orange_dark};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initUI();
    }

    private void initUI() {
        mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
        final GridLayoutManager gridLayoutManager = new GridLayoutManager(this,2);
        gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
            @Override
            public int getSpanSize(int position) {
                //得到每个type的值
                int type = mRecyclerView.getAdapter().getItemViewType(position);
                if (type == DataModel.TYPE_THREE){
                    return gridLayoutManager.getSpanCount();
                }else{
                    return 1;
                }
            }
        });
        mRecyclerView.setLayoutManager(gridLayoutManager);
        mAdapter = new DemoAdapter(this);
        mRecyclerView.setAdapter(mAdapter);
        /**
         * 设置RecyclerView的间距
         * 这样可以实现Grid和RecyclerView单条显示时,很好的区分开
         */
        mRecyclerView.addItemDecoration(new RecyclerView.ItemDecoration() {
            @Override
            public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
                GridLayoutManager.LayoutParams layoutParams = (GridLayoutManager.LayoutParams)view.getLayoutParams();
                int spanSize = layoutParams.getSpanSize();
                int spanIndex = layoutParams.getSpanIndex();
                outRect.top = 20;
                /**
                 * 不相等时说明是Grid形式显示的
                 * 然后判断是左边还有右边显示,分别设置间距为10
                 */
                if (spanSize!=gridLayoutManager.getSpanCount()){
                    if (spanIndex ==1){
                        outRect.left = 10;
                    }else{
                        outRect.right = 10;
                    }
                }
            }
        });
        initData();
    }

    /**
     * 此处主要是模拟数据。方便我们测试
     */
    private void initData() {
        //创建三个数据集合来模拟数据的展示
        ArrayList<DataModeOne> list1 = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            DataModeOne data = new DataModeOne();
            data.avatarColor = colors[0];
            data.name = "name : "+ 1;
            list1.add(data);
        }

        ArrayList<DataModeTwo> list2 = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            DataModeTwo data = new DataModeTwo();
            data.avatarColor = colors[1];
            data.name = "name : "+ 1;
            data.content = "content";
            list2.add(data);
        }

        ArrayList<DataModeThree> list3 = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            DataModeThree data = new DataModeThree();
            data.avatarColor = colors[2];
            data.name = "name : "+ 1;
            data.content = "content";
            data.contentColor = colors[2];
            list3.add(data);
        }

        /**
         * 把数据添加到Adapter中去
         */
        mAdapter.addList(list1,list2,list3);
        mAdapter.notifyDataSetChanged();
    }
}

以上就是所有改造之后的代码 
不明白的可以查看:不一样的RecyclerView优雅实现复杂列表布局(一)

继续深入学习更复杂的布局,可以查看:  RecycleView 实现复杂首页布局三种方式

更多资源源码下载: 
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