删除listview对应内容

本文介绍了一个使用自定义适配器实现的Android ListView应用案例,通过创建FruitAdapter类来展示不同种类的水果图片及名称,并实现了点击移除功能。

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这里写图片描述

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.List;

public class FruitAdapter extends ArrayAdapter<Fruit> {
    private int defaultSelection = -1;
    private List<Fruit> list;
    private int resourceId;

    public FruitAdapter(Context context, int textViewResourceId,
                        List<Fruit> objects) {
        super(context, textViewResourceId, objects);
        resourceId = textViewResourceId;
        this.list=objects;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Fruit fruit = getItem(position); // 获取当前项的Fruit实例
        ViewHolder viewHolder;
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(resourceId,null);
            viewHolder = new ViewHolder(convertView);
            convertView.setTag(viewHolder); // 将ViewHolder存储在convertView中
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }
        viewHolder.fruitImage.setImageResource(fruit.getImageId());
        viewHolder.fruitName.setText(fruit.getName());

        return convertView;
    }

    private class ViewHolder {
        ImageView fruitImage;
        View view;
        TextView fruitName;

        public ViewHolder(View view) {
            this.view = view;
            this.fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
            this.fruitName = (TextView) view.findViewById(R.id.fruit_name);
        }
    }

    /**
     * @param position 设置高亮状态的item
     */
    public void removeSelectPosition(int position) {
        if (!(position < 0 || position > list.size())) {
            list.remove(position);
            notifyDataSetChanged();
        }
    }

}
package nativesample.videolan.org.listview;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;


public class MainActivity extends AppCompatActivity {
    private List<Fruit> fruitList = new ArrayList<Fruit>();
    FruitAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initFruits(); // 初始化水果数据
        adapter = new FruitAdapter(MainActivity.this, R.layout.fruit_item, fruitList);
        ListView listView = (ListView) findViewById(R.id.list_view);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                Fruit fruit = fruitList.get(position);
                Toast.makeText(MainActivity.this, fruit.getName(), Toast.LENGTH_SHORT).show();
                adapter.removeSelectPosition(position);
            }
        });
    }

    private void initFruits() {
        for (int i = 0; i < 2; i++) {
            Fruit apple = new Fruit("Apple", R.drawable.apple_pic);
            fruitList.add(apple);
            Fruit banana = new Fruit("Banana", R.drawable.banana_pic);
            fruitList.add(banana);
            Fruit orange = new Fruit("Orange", R.drawable.orange_pic);
            fruitList.add(orange);
            Fruit watermelon = new Fruit("Watermelon", R.drawable.watermelon_pic);
            fruitList.add(watermelon);
            Fruit pear = new Fruit("Pear", R.drawable.pear_pic);
            fruitList.add(pear);
            Fruit grape = new Fruit("Grape", R.drawable.grape_pic);
            fruitList.add(grape);
            Fruit pineapple = new Fruit("Pineapple", R.drawable.pineapple_pic);
            fruitList.add(pineapple);
            Fruit strawberry = new Fruit("Strawberry", R.drawable.strawberry_pic);
            fruitList.add(strawberry);
            Fruit cherry = new Fruit("Cherry", R.drawable.cherry_pic);
            fruitList.add(cherry);
            Fruit mango = new Fruit("Mango", R.drawable.mango_pic);
            fruitList.add(mango);
        }
    }


}
package nativesample.videolan.org.listview;

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;
    }

}
要实现 ListView删除点击对应 item 的功能,可以按照以下步骤进行: 1. 在 ListView 的 Adapter 中,重写 getView() 方法,为每个 item 的删除按钮设置点击事件。 2. 在点击事件中,获取当前 item 的位置,并从数据源中删除该位置的数据。 3. 调用 Adapter 的 notifyDataSetChanged() 方法,通知 ListView 数据源发生了变化。 示例代码如下: ``` public class MyAdapter extends BaseAdapter { private List<String> mData; public MyAdapter(List<String> data) { mData = data; } @Override public int getCount() { return mData.size(); } @Override public Object getItem(int position) { return mData.get(position); } @Override public long getItemId(int position) { return position; } @Override public View getView(final int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_layout, parent, false); holder = new ViewHolder(); holder.text = convertView.findViewById(R.id.text); holder.delete = convertView.findViewById(R.id.delete); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.text.setText(mData.get(position)); holder.delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { mData.remove(position); notifyDataSetChanged(); } }); return convertView; } static class ViewHolder { TextView text; Button delete; } } ``` 在上面的代码中,ViewHolder 类用于缓存 item 中的控件,避免重复加载。在 getView() 方法中,为每个 item 的删除按钮设置点击事件,其中通过 mData.remove(position) 删除对应位置的数据,然后再调用 notifyDataSetChanged() 方法刷新 ListView。 注意:如果数据源是一个不可变的 List,例如 Arrays.asList(),则不能直接调用 remove() 方法删除数据,需要先将 List 转换为可变的 ArrayList。
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