万能适配器

Activity布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".omnipotent.Main2Activity">

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"></androidx.recyclerview.widget.RecyclerView>
</LinearLayout>

Activity

public class Main2Activity extends AppCompatActivity {

    private RecyclerView recyclerView;
    private ArrayList<Integer> list = new ArrayList<>();
    private ArrayList<String> list2 = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

        list.add(R.mipmap.ic_launcher);
        list.add(R.mipmap.ic_launcher);
        list.add(R.mipmap.ic_launcher);
        list.add(R.mipmap.ic_launcher);

        list2.add("1");
        list2.add("2");
        list2.add("3");
        list2.add("4");

        FirstAdaoter firstadpater = new FirstAdaoter(this,list,list2);
        GridLayoutManager manager = new GridLayoutManager(this, 3);
        recyclerView.setLayoutManager(manager);
        recyclerView.setAdapter(firstadpater);
    }
}

BaseHolder

public class BaseHolder extends RecyclerView.ViewHolder {

    private SparseArray<View> array=new SparseArray<>();

    public BaseHolder(@NonNull View itemView) {
        super(itemView);
    }
    public View getView(int id){
        View view=null;
        view=array.get(id);
        if (view==null) {
            view=itemView.findViewById(id);
            array.put(id,view);
        }
        return view;
    }
}

FirstAdaoter

public class FirstAdaoter extends BaseAdapter<Integer> {

    List<Integer> strings;
    ArrayList<String> strings2;
    Context context;

    public FirstAdaoter(Context context, ArrayList<Integer> data,ArrayList<String> strings2) {
        super(context, data);
        this.context = context;
        this.strings = data;
        this.strings2=strings2;
    }

    @Override
    public int getLayout() {
        return R.layout.item_layout;
    }

    @Override
    public void bangding(BaseHolder holder, int position) {
        //找到控件 赋值
        ImageView imageView = (ImageView) holder.getView(R.id.image);
        imageView.setImageResource(strings.get(position));

        TextView textView= (TextView) holder.getView(R.id.textView);
        textView.setText(strings2.get(position));
    }
}

Adapter

public abstract class BaseAdapter<T> extends RecyclerView.Adapter<BaseHolder> {

    Context context;//上下文
    List<T> data;//数据源

    public BaseAdapter(Context context, List<T> data) {
        this.context = context;
        this.data = data;
    }

    //XXX.xml
    public abstract int getLayout(); //抽象，必须让子类重写，重写的时候给我一个具体的布局的id，item_layout.xml

    @NonNull
    @Override
    public BaseHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(context).inflate(getLayout(),null);
        return new BaseHolder(v);
    }

    @Override
    public void onBindViewHolder(@NonNull BaseHolder holder, int position) {
        bangding(holder,position);
    }

    public abstract void bangding(BaseHolder holder, int position);

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

item_layout

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

    <ImageView
        android:scaleType="fitXY"
        android:id="@+id/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>