RecyclerView的多部局应用

需要依赖一个recyderView包

implementation 'com.android.support:recyclerview-v7:26.1.0'

先写布局这个是自定义布局

<android.support.constraint.ConstraintLayout    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"    android:layout_height="wrap_content">    <TextView        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/text_Title"        /></android.support.constraint.ConstraintLayout>

在适配器中使用布局一种应用

public class ViewHolder_1 extends RecyclerView.ViewHolder{    private TextView textView;    private Context context;    public ViewHolder_1(View itemView, Context context) {        super(itemView);        this.context = context;    }    public ViewHolder_1(View itemView) {        super(itemView);        textView = itemView.findViewById(R.id.text_Title);    }    public void rendr(String text){        textView.setText(text);    }}

下面是适配器

public class MyAdapter extends SectionedRecyclerViewAdapter<ViewHolder_1,ViewHolder_2,ViewHolder_3>{    private Context context;    public MyAdapter(Context context) {        this.context = context;    }        //一共有几个item    @Override    protected int getSectionCount() {        return 5;    }            @Override    protected int getItemCountForSection(int section) {        return section+1;//表示条目    }    //返回true表示含有脚视图    @Override    protected boolean hasFooterInSection(int section) {        return true;    }        //头部的布局    @Override    protected ViewHolder_1 onCreateSectionHeaderViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(context).inflate(R.layout.viewholder_1,parent,false);        return new ViewHolder_1(view);    }        //脚部的布局    @Override    protected ViewHolder_3 onCreateSectionFooterViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(context).inflate(R.layout.viewholder_3,parent,false);        return new ViewHolder_3(view);    }        //中间的布局    @Override    protected ViewHolder_2 onCreateItemViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(context).inflate(R.layout.viewholder_2,parent,false);        return new ViewHolder_2(view);    }        //传向布局一的数据    @Override    protected void onBindSectionHeaderViewHolder(ViewHolder_1 holder, int section) {        holder.rendr("section"+(section+1));    }    //传向脚部布局的数据    @Override    protected void onBindSectionFooterViewHolder(ViewHolder_3 holder, int section) {        holder.rendr("section"+(section+1));    }        //下面是中间的数据    protected int[] colors = new int[]{0xfff44336, 0xff2196f3, 0xff009688, 0xff8bc34a, 0xffff9800};    @Override    protected void onBindItemViewHolder(ViewHolder_2 holder, int section, int position) {        holder.rendr(String.valueOf(position + 1), colors[section]);    }}

下面是主部局进行适配器绑定

public class MainActivity extends AppCompatActivity {    @BindView(R.id.recyclerView)    RecyclerView recyclerView;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        ButterKnife.bind(this);        //创建适配器        MyAdapter myAdapter = new MyAdapter(this);        GridLayoutManager grid = new GridLayoutManager(this,2);        //设置列的宽度        SectionedSpanSizeLookup se = new SectionedSpanSizeLookup(myAdapter,grid);        grid.setSpanSizeLookup(se);        //设置布局管理器        recyclerView.setLayoutManager(grid);        //并设置适配器        recyclerView.setAdapter(myAdapter);    }}