android——RecyclerView通用适配器

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ExecFunction编程式接口

public interface ExecFunction {
    public void exec(Object data, View view);
}

MyAdapter.java:

public class  MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
    /**
     * 抽离出不同点
     * 1. 执行上下文
     * 2. RecyclerView实例
     * 3. 数据源
     * 4. 子项视图
     * 5. 绑定方法
     */
    private  List dataResource;       // 数据源
    private int layoutId ;            // 视图资源
    private ExecFunction function;    // 数据视图绑定
    private int len = -1;             // 子项渲染个数，-1代表所有 
    public RecyclerView view;         //  RecyclerView实例，公共成员变量

    /**
     * @param activity 渲染RecyclerView所在的Activity实例
     * @param resourceId RecyclerView组件id
     * @param dataResource 数据源
     * @param layoutId 布局id
     * @param function 回调方法用于数据与视图的绑定
     */
    public MyAdapter(AppCompatActivity activity, int resourceId, List dataResource, int layoutId, ExecFunction function){
        this.dataResource = dataResource;
        this.layoutId = layoutId;
        this.function = function;
        this.view = (RecyclerView)activity.findViewById(resourceId);
        this.view.setAdapter(this);
    }

    public void setLength(int length){
        this.len = length;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(layoutId,parent,false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        View view = holder.getView();
        function.exec(dataResource.get(position),view);
    }

    @Override
    public int getItemCount() {
        if(this.len>0){
            return this.len;
        }else if(this.len==0){
            throw new RuntimeException("The length must not be 0");
        }
        return dataResource.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder{
        private View view = null;
        public ViewHolder(@NonNull View itemView) {
            super(itemView);
            this.view = itemView;
        }
        public View getView(){
            return view;
        }
    }
}

使用示例：

    MyAdapter adapter = new MyAdapter(this,R.id.recycle_list,list, R.layout.test_view, new ExecFunction() {
        @Override
        public void exec(Object data, View view) {
            final TestBean d = (TestBean) (data);
            TextView title = (TextView)view.findViewById(R.id.test_title);
            TextView content = (TextView)view.findViewById(R.id.test_content);
            content.setText(d.name);
            title.setText(String.valueOf(d.age));
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast t = Toast.makeText(this,"点击了"+d.name, Toast.LENGTH_SHORT);
                    t.show();
                }
            });
        }
    });
    adapter.setLength(12);
    adapter.view.setLayoutManager(new GridLayoutManager(this,4));

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