android RecyclerView的做法

想做表單可以使用gridview或是listview

或是新的RecyclerView。

可以直接在MainActivity新增要使用的adapter class

RecyclerView需要三個東西

自定義一個放資料的class

Adapter和Adapter中的ViewHolder


1.

	public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyHolder>{
	@NonNull
	@Override
	public MyHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
	View view = LayoutInflater.from(MainActivity.this).inflate(R.layout.my_list,viewGroup,false);
	return new MyHolder(view);
	}
	@Override
	public void onBindViewHolder(@NonNull MyHolder myHolder, int i) {
	myHolder.icon.setImageResource(myData.get(i).getResource());
	myHolder.name.setText(myData.get(i).getName());
	}
	@Override
	public int getItemCount() {
	return myData.size();
	}
	public class MyHolder extends RecyclerView.ViewHolder{
	ImageView icon;
	TextView name;
	public MyHolder(@NonNull View itemView) {
	super(itemView);
	icon = itemView.findViewById(R.id.icon);
	name = itemView.findViewById(R.id.text);
	}
	}
	}

view raw adapter.java hosted with ❤ by GitHub

adapter裡面再新增一個view holder，
要實作方法的時候可以在底部有紅線的地方，
使用alt+insert看需要哪些方法。




之後寫一個提供資料的class




2.

	public class MyData{
	int resource;
	String name;
	public MyData(int resource, String name) {
	this.resource = resource;
	this.name = name;
	}
	public int getResource() {
	return resource;
	}
	public void setResource(int resource) {
	this.resource = resource;
	}
	public void setName(String name) {
	this.name = name;
	}
	public String getName() {
	return name;
	}
	}

view raw mydata.java hosted with ❤ by GitHub

3.

	myData = new ArrayList<>();
	myData.add(new MyData(R.drawable.cd_example,"123"));
	myData.add(new MyData(R.drawable.cd_example,"123"));
	RecyclerView rv = findViewById(R.id.rv);
	rv.setHasFixedSize(true);
	rv.setLayoutManager(new GridLayoutManager(this,4));
	MyAdapter adapter = new MyAdapter();
	rv.setAdapter(adapter);

view raw main.java hosted with ❤ by GitHub