基类（原始）

主界面的基类
在使用时要依赖3个，下图右2，搜索butterknife（红框中的2个），recycler

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public abstract class BaseAcyivity extends AppCompatActivity {

private Unbinder bind;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(getlayoutId());
    bind = ButterKnife.bind(this);
    initdata();
    setOnClick();


}

public abstract void initdata() ;

public abstract int getlayoutId();

public void setOnClick(){

}

@Override
protected void onDestroy() {
    super.onDestroy();
    bind.unbind();
}
}

APP的基类，承接上下文（记住APP这个类必须要在清单文件中注册）

记住APP这个类必须要在清单文件中注册
public class App extends Application{

public static App appContext;

@Override
public void onCreate() {
    super.onCreate();
    appContext = this;
}
}

适配器的基类（Recycler）

public abstract class AllBaseAdapter extends          RecyclerView.Adapter{

private List data;
private onItemClickListaner listaner;

public AllBaseAdapter(List data) {
    this.data = data;
}

@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    //查找对应Item布局
    View view = LayoutInflater.from(parent.getContext()).inflate(getLayoutId(), parent, false);
     MyViewHolder holder=new MyViewHolder(view);
    return holder;
}

@Override
public void onBindViewHolder(final AllBaseAdapter.MyViewHolder holder, final int position) {
    //设置数据
    mset(holder,data.get(position));
    //item设置的点击事件
    holder.itemView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (listaner!=null){
                listaner.onItemClick(v,position);
            }
        }
    });
}
//传过来的数据个数
@Override
public int getItemCount() {
    return data==null?0:data.size();
}

public abstract int getLayoutId() ;


public class MyViewHolder extends RecyclerView.ViewHolder{

    public View itemView;

    public MyViewHolder(View itemView) {
        super(itemView);
        this.itemView = itemView;
    }
    //将ID的强转写在这里
    protected  E getViewById(@IdRes int viewId) {
        return (E) itemView.findViewById(viewId);
    }
    //设置数据
    public void setText(@IdRes int id,String context){
        TextView textView= getViewById(id);
        textView.setText(context);
    }
    public void setIoce(@IdRes int id, Drawable ioce){
        ImageView imageView=getViewById(id);
        imageView.setImageDrawable(ioce);
    }
    //。。。。。可以设置所有的控件，用时直接点
}
//viewHolder重写承接,setData代表数组中的东西
public abstract void mset(MyViewHolder holder,Object setData);

 //自己定义一个点击监听的接口
public interface onItemClickListaner{
    void onItemClick(View itemView,int position);
}
//设置监听，用传进来的listaner代替它的listaner
public void setOnItemClick(onItemClickListaner listaner){
    this.listaner = listaner;
}
}

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举个例子

继承适配器的类

public class MainAdapter extends AllBaseAdapter {

public MainAdapter(List data) {
    super(data);
}

@Override
public int getLayoutId() {
    return R.layout.item_main;
}

@Override
public void mset(MyViewHolder viewHolder, Object setData) {
    //这里可以设置各种控件的数据：viewHolder.        点后面跟控件的方法名
     viewHolder.setText(R.id.tv_item_recycler, (String) setData);
}
}

主界面对点击的使用

 public class MainActivity extends BaseAcyivity {

@BindView(R.id.recycler_main)
RecyclerView recyclerMain;
private MainAdapter adapter;


@Override
public void initdata() {
    List datas=new ArrayList<>();
    datas.add("草莓");datas.add("火龙果");datas.add("苹果");datas.add("木瓜");
    datas.add("西瓜");datas.add("橘子");datas.add("香蕉");datas.add("火龙果");
    datas.add("梨");datas.add("草莓");datas.add("火龙果");datas.add("苹果");
    datas.add("木瓜");datas.add("西瓜");datas.add("橘子");datas.add("香蕉");
    datas.add("火龙果");datas.add("梨");
    RecyclerView.LayoutManager manager=new LinearLayoutManager(this, LinearLayoutManager.VERTICAL,false);
    recyclerMain.setLayoutManager(manager);
    adapter = new MainAdapter(datas);
    recyclerMain.setAdapter(adapter);
    //分割线
    recyclerMain.addItemDecoration(new DividerItemDecoration(this,LinearLayoutManager.VERTICAL));

}

@Override
public int getlayoutId() {
    return R.layout.activity_main;
}

public void setOnClick(){
   adapter.setOnItemClick(new AllBaseAdapter.onItemClickListaner() {
       @Override
       public void onItemClick(View itemView, int position) {
           Toast.makeText(MainActivity.this,"ok",Toast.LENGTH_SHORT).show();
       }
   });
}
}

布局自己写找到对应ID