Question

我点击它时尝试从ListView更改ImageView。我的方法如何尝试它看起来像这样：

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这在我的ListView的private void updateEQAnimation(int index){ View v = LV_songView.getChildAt(index -LV_songView.getFirstVisiblePosition()); if(v == null) return; ImageView EQ_ANIM = (ImageView) v.findViewById(R.id.imageView_eq_animation); EQ_ANIM.setVisibility(View.VISIBLE); }中调用，如下所示：

onItemClickListener

现在我的问题：

当我向上或向下滚动时，其他ListView元素的ImageView也会发生变化。但实际上我只想更改一个。

Answer 1

最佳方法是在列表适配器中添加一个公共方法如何？我将描述。

首先创建您想要在列表视图中显示的对象。

public class YourObject {

private int id;
private int avatar;
private String name;

public YourObject(int id, int avatar, String name) {
    this.id = id;
    this.avatar = avatar;
    this.name = name;
}

public int getAvatar() {
    return avatar;
}

public void setAvatar(int avatar) {
    this.avatar = avatar;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}

@Override
public String toString() {
    return new Gson().toJson(this);
}}

制作如下的适配器：

公共类YourAdapter扩展了BaseAdapter {

private AppCompatActivity ctx;
private LayoutInflater li;
private LinkedHashMap<Integer, YourObject> items;

public YourAdapter(AppCompatActivity ctx, LinkedHashMap<Integer, YourObject> items) {
    this.ctx = ctx;
    this.items = items;
    this.li = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

@Override
public int getCount() {
    return items.size();
}

@Override
public YourObject getItem(int position) {
    List<YourObject> lst = new ArrayList<>(items.values());
    return lst.get(position);
}

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

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    convertView = li.inflate(R.layout.lst_item_your_view, null);
    ImageView avatar = (ImageView) convertView.findViewById(R.id.avatar);
    CustomTextView name = (CustomTextView) convertView.findViewById(R.id.name);

    name.setText(getItem(position).getName());

    avatar.setImageResource(getItem(position).getAvatar());

    return convertView;
}

public void refresh(final YourObject yourObject) {
            items.remove(yourObject.getId());
            items.put(yourObject.getId(), yourObject);
            notifyDataSetChanged();
}

}

现在，在您的活动中，您可以在以下所有位置进行更改：

YourAdapter adapter = new YourAdapter（ctx，items）; listView.setAdapter（适配器）; YourObject your object = new YourObject（id，R.drawable.other_icon，＆＃34; name＆＃34;）; adapter.refresh（yourObject）;

尝试更改一个ListView元素Bug

1 个答案: