Question

我的listview项目有这个布局：

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal"
    android:padding="10dp">

    <ImageView
        android:id="@+id/cartIcon"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_marginRight="10dp"
        android:onClick="addToCartClick"
        android:src="@drawable/ic_launcher" />

    <TextView
        android:id="@+id/itemName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="5dp"
        android:layout_toRightOf="@id/cartIcon"
        android:text="Filé Mignon"
        android:textAppearance="@android:style/TextAppearance.Small"
        android:typeface="normal" />

    <TableLayout
        android:id="@+id/tableInfo"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/itemName"
        android:layout_toRightOf="@id/cartIcon"
        android:weightSum="3">

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                android:id="@+id/qtyText"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Qtd"
                android:textAlignment="center"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:id="@+id/priceText"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Preço"
                android:textAlignment="center"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:id="@+id/totalText"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Total"
                android:textAlignment="center"
                android:textAppearance="?android:attr/textAppearanceSmall" />

        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                android:id="@+id/qty"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="2 Kg"
                android:textAlignment="center"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:id="@+id/price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="R$ 75,00"
                android:textAlignment="center"
                android:textAppearance="?android:attr/textAppearanceSmall" />

            <TextView
                android:id="@+id/total"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="R$ 150,00"
                android:textAlignment="center"
                android:textAppearance="?android:attr/textAppearanceSmall" />

        </TableRow>
    </TableLayout>

</RelativeLayout>

对于ImageView的onClick方法：

android:onClick="addToCartClick"

点击ImageView时onClick会正常触发，但无法获得正确的视图我想在onClick发生时替换图像，它取代了，但不仅仅是这个ImageView。它取代了其他几个。这似乎是随机的 onClick的代码如下：

 public void addToCartClick(View view) {
    ImageView img = (ImageView) view;
    img.setImageResource(R.drawable.cart_add);
}

适配器代码：

public class ShopListAdapter extends ArrayAdapter<ShopListItem> {

Context context;
int resource;
ShopListItem[] objects;

public ShopListAdapter(Context context, int resource, ShopListItem[] objects) {
    super(context, resource, objects);

    this.context = context;
    this.resource = resource;
    this.objects = objects;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        // inflate the layout
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        convertView = inflater.inflate(resource, parent, false);
    }

    // object item based on the position
    ShopListItem item = objects[position];

    // get the TextView and then set the text (item name) and tag (item ID) values
    TextView itemName = (TextView) convertView.findViewById(R.id.itemName);
    itemName.setText(item.itemName);

    TextView qty = (TextView) convertView.findViewById(R.id.qty);
    qty.setText(item.quantity + "kg");

    TextView price = (TextView) convertView.findViewById(R.id.price);
    price.setText("R$" + item.price);

    TextView total = (TextView) convertView.findViewById(R.id.total);
    total.setText("R$" + item.total);

    return convertView;
}

}

我错过了什么？

Answer 1

ListView项目视图由ListView回收您应该在Adapter＃getView中将默认图像资源设置为ImageView。

<强> EDITED 你可以使用标签。

 public void addToCartClick(View view) {
    ImageView img = (ImageView) view;
    img.setImageResource(R.drawable.cart_add);
    ((MyAdapter.MyItem)img.getTag()).addedCart = true;
}

你的Adapter类。

public class MyAdapter extends BaseAdapter {
    public static class MyItem {
        public boolean addedCart;

        public MyItem(boolean addedCart) {
            this.addedCart = addedCart;
        }
    }

    public List<MyItem> itemList = new ArrayList<>();
    public MyAdapter() {
        final ArrayList<MyItem> myItems = new ArrayList<>();
        // your list size
        for (int i = 0; i < 10; i++) {
            myItems.add(new MyItem(false));
        }
        this.itemList = myItems;
    }

    @Override
    public int getCount() {
        return 10;
    }

    @Override
    public Object getItem(int position) {
        return itemList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // Inflate View

        imageView.setTag(getItem(position));
        if (((MyItem)getItem(position)).addedCart){
            imageView.setImageResource(R.drawable.cart_add);
        }else{
            imageView.setImageResource(R.drawable.default_image);
        }
        return view;
    }
}

Answer 2

在ShopListItem类中取一个布尔值 -

  public boolean isSelected;

然后检入getView方法并根据此布尔值设置其图像，因此当您滚动列表视图时，图像将设置为您之前选择的特定图像视图 -

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    if (convertView == null) {
        // inflate the layout
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        convertView = inflater.inflate(resource, parent, false);
    }

    // object item based on the position
    ShopListItem item = objects[position];

    // get the TextView and then set the text (item name) and tag (item ID) values
    TextView itemName = (TextView) convertView.findViewById(R.id.itemName);
    itemName.setText(item.itemName);

    TextView qty = (TextView) convertView.findViewById(R.id.qty);
    qty.setText(item.quantity + "kg");

    TextView price = (TextView) convertView.findViewById(R.id.price);
    price.setText("R$" + item.price);

    TextView total = (TextView) convertView.findViewById(R.id.total);
    total.setText("R$" + item.total);

    ImageView img = (ImageView) view.findViewById(R.id.cartIcon);
    img.setTag(position);

    if ( objects.isSelected ){

       img.setImageResource(R.drawable.cart_add);
    }else{
        // you can set default image here
    }
  }

    return convertView;
}

并添加此代码 -

 public void addToCartClick(View view) {
    object.get( Integer.parseInt(view.getTag()) ).isSelected = true;
    notifyDatasetChanged();
 }

Answer 3

您应该使用onClick方法定义getView逻辑。你正在为它定义一个点击监听器，但它还不知道该位置。从getView，您可以传递项目的位置以查看正确的项目

修改：如果您要更改行本身，请按照this链接

进行操作

Answer 4

你是否重写public boolean hasStableIds()才能返回true？听起来像是ListView中的某些项可能具有相同的ID。如果要覆盖public long getItemId(int position)，请确保该函数不能为不同的ListView项返回相同的long。您还应该设置public boolean hasStableIds()以返回false。

如果这不起作用，请尝试从XML文件中删除android:onClick="addToCartClick"，然后在ListAdapter的public View getView (int position, View convertView, ViewGroup parent)函数中添加一个OnClickListener，如下所示：

imageView.setOnClickListener(new View.OnClickListener() {
    void onClick(View v) {
        addToCartClick(imageView)
    }
});

Answer 5

全力以赴，我找到了解决方案：

我的新getView带有@Mohamed建议的视图持有者模式：

Nothing uploaded

onClick方法：

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    ViewHolder viewHolder;
    // object item based on the position
    final ShopListItem item = objects[position];

    if (convertView == null) {
        // inflate the layout
        LayoutInflater inflater = ((Activity) context).getLayoutInflater();
        convertView = inflater.inflate(resource, parent, false);

        viewHolder = new ViewHolder();
        viewHolder.itemName = (TextView) convertView.findViewById(R.id.itemName);
        viewHolder.qty = (TextView) convertView.findViewById(R.id.qty);
        viewHolder.price = (TextView) convertView.findViewById(R.id.price);
        viewHolder.total = (TextView) convertView.findViewById(R.id.total);
        viewHolder.img = (ImageView) convertView.findViewById(R.id.cartIcon);

        convertView.setTag(viewHolder);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    // get the TextView and then set the text (item name) and tag (item ID) values

    viewHolder.itemName.setText(item.itemName);

    viewHolder.qty.setText(item.quantity + "kg");

    viewHolder.price.setText("R$" + item.price);

    viewHolder.total.setText("R$" + item.total);

    //Here's the trick
    viewHolder.img.setTag(R.string.tag_adapter, this);
    viewHolder.img.setTag(R.string.tag_item, item);

    if(!item.finished)
        viewHolder.img.setImageResource(R.drawable.ic_launcher);
    else
        viewHolder.img.setImageResource(R.drawable.cart_add);
    //End Here's the trick
    return convertView;
}

并且，正如@ARMV所建议的，创建了一个标志＆＃34;完成＆＃34;检查使用哪个图像。这样就不需要在适配器中放置onClickListener。并使用适配器和当前项目设置标签我可以使用多个列表视图也可以使用Men Taka建议的标签它运作得很好。
谢谢大家！

onClick已解雇，但未获得正确的listview项目

5 个答案: