ListView控件的使用

最新推荐文章于 2025-06-09 16:39:38 发布

原创最新推荐文章于 2025-06-09 16:39:38 发布 · 559 阅读

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#控件 #android #listview

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本文详细介绍如何在Android应用中使用ListView控件，包括基本配置、数据填充及点击事件处理。通过实例展示ListView的优化技巧，如convertView和ViewHolder模式的运用。

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ListtView

包括listview的基本使用，listview的优化等。

我们经常会在应用程序中使用列表的形式来展现一些内容，所以学好ListView是非常必需的。ListView也是Android中比较难以使用的控件，这节内容就将详细解读ListView的用法。

public class SecondActivity extends AppCompatActivity {


private String[] data = {"Apple","Banana","Orange","Watermelon","Pear",
        "Grape","Pineapple","Strawberry","Cherry","Mango","Apple","Banana","Orange","Watermelon","Pear",
        "Grape","Pineapple","Strawberry","Cherry","Mango","Apple","Banana","Orange","Watermelon","Pear",
        "Grape","Pineapple","Strawberry","Cherry","Mango"};
private List<Fruit> fruitList = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.sencend_layout);

    FruitAdapter adapter = new FruitAdapter(SecondActivity.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(SecondActivity.this,fruit.getName(),Toast.LENGTH_SHORT).show();

        }
    });

listView.setAdapter(adapter);
initFruits();

}

private void initFruits() {
    for (int i = 0;i < 2; i++){
        Fruit apple = new Fruit("Apple",R.mipmap.left);
        fruitList.add(apple);
        Fruit banana = new Fruit("Banana",R.mipmap.right);
        fruitList.add(banana);
        Fruit orange = new Fruit("Orange",R.mipmap.right);
        fruitList.add(orange);
        Fruit watermelon = new Fruit("Watermelon",R.mipmap.right);
        fruitList.add(watermelon);
        Fruit pear = new Fruit("Pear",R.mipmap.right);
        fruitList.add(pear);
        Fruit grape = new Fruit("Grape",R.mipmap.right);
        fruitList.add(grape);
        Fruit pineapple = new Fruit("Pineapple",R.mipmap.right);
        fruitList.add(pineapple);
        Fruit strawberry = new Fruit("Strawberry",R.mipmap.right);
        fruitList.add(strawberry);
        Fruit cherry = new Fruit("Cherry",R.mipmap.right);
        fruitList.add(cherry);
        Fruit mango = new Fruit("Mango",R.mipmap.right);
        fruitList.add(mango);

    }
}

}
//在布局中添加一个listview控件

<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<!--<include layout="@layout/title_layout"/>-->
<ListView
    android:id="@+id/list_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

</ListView>

//适配器
优化listView：convertView和ViewHolder的使用

public class FruitAdapter extends ArrayAdapter<Fruit> {
private int resourceId;

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

public View getView(int position,View convertView,ViewGroup parent){
    Fruit fruit = getItem(position);
    View view;

    ViewHolder viewHolder;
    if (convertView == null){
        view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);
        viewHolder = new ViewHolder();
        viewHolder.fruitImage = (ImageView)view.findViewById(R.id.fruit_image);
        viewHolder.fruitName = (TextView)view.findViewById(R.id.fruit_name);
        view.setTag(viewHolder);//将ViewHolder存储在View中

    }else {
        view = convertView;
        viewHolder = (ViewHolder)view.getTag();//重新获取ViewHolder

    }
    viewHolder.fruitImage.setImageResource(fruit.getImageId());
    viewHolder.fruitName.setText(fruit.getName());

    return view;
}
class ViewHolder{
    ImageView fruitImage;
    TextView fruitName;
}

}
//布局

<LinearLayout
 xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
    android:id="@+id/fruit_image"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
<TextView
    android:id="@+id/fruit_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:layout_marginLeft="10dp"/>
</LinearLayout>