定制ListView(在ListView的简单用法基础上修改)

新建fruit实体类

public class Fruit {

    private String name;

    private int imageId;

    public Fruit(String name, int imageId) {
        this.name = name;
        this.imageId = imageId;
    }

    public String getName() {
        return name;
    }

    public int getImageId() {
        return imageId;
    }
}

为ListView子项指定自定义布局

新建fruit_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:ignore="UseCompoundDrawables">

    <ImageView
        android:id="@+id/fruit_image"
        android:layout_width="35sp"
        android:layout_height="35sp"/>

    <TextView
        android:id="@+id/fruit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:layout_marginStart="10dp"
        />
</LinearLayout>

创建自定义适配器

public class FruitAdapter extends ArrayAdapter<Fruit> {

    private final int resourceId;

    @NonNull
    @Override
    @SuppressLint("ViewHolder")
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        Fruit fruit = getItem(position); //获取当前项的Fruit实例
        View view = LayoutInflater.from(getContext()).inflate(resourceId, parent, false); //动态加载资源
        ImageView fruitImage = view.findViewById(R.id.fruit_image);
        TextView fruitName = view.findViewById(R.id.fruit_name);
        fruitImage.setImageResource(fruit.getImageId());
        fruitName.setText(fruit.getName());
        return view;
    }

    public FruitAdapter(@NonNull MainActivity context, @NonNull List<Fruit> objects, int resourceId) {
        super(context, resourceId, objects);
        this.resourceId = resourceId;
    }
}

修改MainActivity

public class MainActivity extends AppCompatActivity {

    public List<Fruit> fruitList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initFruits();
        FruitAdapter adapter = new FruitAdapter(MainActivity.this,
                fruitList, R.layout.fruit_item);
        ListView listView = findViewById(R.id.list_view);
        listView.setAdapter(adapter);

    }

    private void initFruits() {

        for (int i = 0; i < 2; i++) {
            Fruit apple = new Fruit("Apple",R.drawable.ic_apple);
            fruitList.add(apple);
            Fruit banana = new Fruit("Banana",R.drawable.ic_banana);
            fruitList.add(banana);
            Fruit orange = new Fruit("Orange",R.drawable.ic_orange);
            fruitList.add(orange);
            Fruit watermelon = new Fruit("Watermelon",R.drawable.ic_watermelon);
            fruitList.add(watermelon);
            Fruit pear = new Fruit("Pear",R.drawable.ic_pear);
            fruitList.add(pear);
            Fruit grape = new Fruit("Grape",R.drawable.ic_grape);
            fruitList.add(grape);
            Fruit pineapple = new Fruit("Pineapple",R.drawable.ic_pineapple);
            fruitList.add(pineapple);
            Fruit strawberry = new Fruit("Strawberry",R.drawable.ic_strawberry);
            fruitList.add(strawberry);
            Fruit cherry = new Fruit("Cherry",R.drawable.ic_cherry);
            fruitList.add(cherry);
            Fruit mango = new Fruit("Mango",R.drawable.ic_mango);
            fruitList.add(mango);
        }
    }
}
posted @ 2022-07-31 13:49  jarico  阅读(30)  评论(0)    收藏  举报