java - ListView 适配器行为异常。在我单击同一个 ListView 中的按钮后，ListView 中不相关的按钮被单击

Question

So, what I want is to individually disable a button for the concerned item in the ListView when clicked on the button itself. This should work for multiple buttons as well.

I tried many places for solutions but didn't get a good enough answer.

What's happening is when i click on a button in the listview, i see other buttons getting clicked automatically when i scroll down to see other buttons which is quite weird and not helping the situation.

这是适配器。

public class ListViewAdapter extends BaseAdapter implements ListAdapter {

private ArrayList<String> list = new ArrayList<String>();
private Context context;
private StringBuilder user_id;
private Button sendReq;
private ListViewAdapter adapter;
private JSONArray peopleArray;
private int selectedIndex;
private ViewHolder viewHolder;
private static boolean[] buttonsClicked;
private View rowView;

public ListViewAdapter(ArrayList<String> list, Context context,String user_id,JSONArray jsonArray) {
    this.user_id = new StringBuilder(user_id.toString());
    this.list = list;
    this.context = context;
    peopleArray = jsonArray;
    selectedIndex = -1;
    this.adapter = this;
    buttonsClicked = new boolean[list.size()];
}

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

@Override
public Object getItem(int pos) {
    return list.get(pos);
}

@Override
public long getItemId(int pos) {
    //return list.get(pos).getId();
    //just return 0 if your list items do not have an Id variable.
    return 0;
}

@Override
public boolean isEnabled(int position){
    return false;
}

static class ViewHolder{
    public TextView ItemText;
    public Button ItemButton;
}

public void setSelectedIndex(int index){
    selectedIndex = index;
    notifyDataSetChanged();
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    rowView = convertView;

    if (rowView == null) {
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        rowView = inflater.inflate(R.layout.my_custom_list_layout, null);
        //configure view holder
        viewHolder = new ViewHolder();
        viewHolder.ItemText = (TextView) rowView.findViewById(R.id.list_item_text);
        viewHolder.ItemButton = (Button) rowView.findViewById(R.id.list_item_button);
        rowView.setTag(viewHolder);
    }
    else {
        //fill data
        viewHolder = (ViewHolder) rowView.getTag();
    }
    //Handle TextView and display string from your list
    TextView listItemText = (TextView)rowView.findViewById(R.id.list_item_text);
    listItemText.setText(list.get(position));

    //Handle buttons and add onClickListeners
    sendReq = (Button) rowView.findViewById(R.id.list_item_button);

    viewHolder.ItemButton.setOnClickListener(new View.OnClickListener(){
        @Override
        public void onClick(View v) {
            //do something
            //list.remove(position); //or some other task

            Log.d("Button position: ", " " +  position);
            ((Button)v).setEnabled(false);
            notifyDataSetChanged();
        }
    });

    return rowView;
}
}

这是布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="60dp"
android:weightSum="100"
android:orientation="horizontal">

    <ImageView
        android:id="@+id/list_item_image"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="20"
        android:src="@drawable/default_picture"/>

    <TextView
        android:id="@+id/list_item_text"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:gravity="center"
        android:layout_weight="50"
        android:textSize="18sp"
        android:textStyle="bold" />

    <Button
        android:id="@+id/list_item_button"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="30"
        android:text="Send Req"
        android:focusable="false"/>

</LinearLayout>

这就是我在 Activity 中使用适配器的方式

arrayList.add("Never");
arrayList.add("let");
arrayList.add("anyone");
arrayList.add("make");
arrayList.add("you");
arrayList.add("that");
arrayList.add("you");
arrayList.add("have");
arrayList.add("limits");
myAdapter = new ListViewAdapter(arrayList,this,"",jsonArray);
listview.setAdapter(myAdapter);

Answer 1

当你点击一个按钮时，它会禁用一个Button .然后，当你滚动时，那个 Button将被其他元素回收和再利用。你永远不会重新启用那个 Button ，所以过了一会儿，上下滚动，你所有的Button s 将被禁用。

这不是执行此操作的正确方法。您不能在任何 View 中进行更改基于用户所做的某些操作(如单击按钮)，因为 View s 在 ListView所有这些都被回收并重新用于不同的列表项。当用户执行某些操作时，您需要更改您的数据。在 getView()您需要使用数据 来设置View 的状态

在你的情况下，你可以这样做:

• 添加 private boolean[] enabled数组作为适配器中的成员变量。

• 像这样在适配器构造函数中初始化数组:

  enabled = new boolean[list.size()];
// Enable all items
for (int k = 0; k < enabled.length; k++) {
enabled[k] = true;
}

• 在你的onClick()方法，执行此操作而不是禁用 Button :

  enabled[position] = false;
notifyDataSetChanged();

• 在 getView() , 设置 Button启用状态基于您的数据，如下所示:

  viewHolder.ItemButton.setEnabled(enabled[position]);