setVisibility调整自定义Listview中的错误按钮

Question

我有一个带有文本和播放暂停按钮的自定义列表视图。单击播放按钮时，我试图使播放按钮不可见。但是当我在 onClick 中执行此操作时，错误位置的按钮在列表视图中消失了。像;按钮：A - B - C - D - E，当我点击 C 时，E 变得不可见。不知如何处理，求助

public class MyListAdapter extends ArrayAdapter<String> {

private String[] gelenurl;
List<String> gelen_ad;
MediaPlayer mPlayer= new MediaPlayer();

private int[] IMAGE_ID = {R.drawable.police};
private int layout;
public MyListAdapter(Context context, int resource, List<String> objects, String[] arr) {
    super(context, resource, objects);
    layout=resource;
    gelenurl=arr;
    gelen_ad=objects;
}


ViewHolder viewHolder = new ViewHolder();
@NonNull
@Override

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

    ViewHolder mainViewholder = null;
    convertView=null;

    if(convertView==null) {
        LayoutInflater inflater = LayoutInflater.from(getContext());
        convertView=inflater.inflate(layout, parent, false);

        viewHolder.img = (ImageView) convertView.findViewById(R.id.list_item_thumbnail);
        viewHolder.img.setImageResource(IMAGE_ID[0]);
        viewHolder.title = (TextView) convertView.findViewById(R.id.list_item_text);
        viewHolder.title.setText(getItem(position));
        viewHolder.button = (Button) convertView.findViewById(R.id.list_item_btn);
        viewHolder.stop_button = (Button) convertView.findViewById(R.id.list_item_stop_btn);

        convertView.setTag(viewHolder);

    }

    else {

        mainViewholder = (ViewHolder) convertView.getTag();
        mainViewholder.title.setText(getItem(position));

    }

    viewHolder.button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {

                viewHolder.button.setVisibility(View.INVISIBLE);
                radioLinks(gelenurl[position]);


            } catch (IOException e) {
                e.printStackTrace();
            }
        }


        public void radioLinks(String city) throws IOException {

            if(mPlayer.isPlaying()) {

                mPlayer.stop();
                mPlayer.reset();


            }

            mPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            mPlayer.setDataSource(city);
            mPlayer.prepareAsync();


            mPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                @Override
                public void onPrepared(MediaPlayer mp) {

                    mPlayer.start();

                }
            });

        }

    });

    viewHolder.stop_button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            mPlayer.stop();
            mPlayer.reset();
        }
    });
    return convertView;
}

}

Answer 1

viewHolder是一个class成员变量。 (ViewHolder viewHolder = new ViewHolder())，所以每次输入getView()而convertView是null，你设置的都是一样的viewHolder。因此，无论最近在 getView() 中设置什么值，都会在 onClick() 中进行操作。您可能希望在 convertView 为 null 时创建一个新的视图持有者，而不是使用相同的成员变量。

看看this tutorial。在 class PersonsAdapter 中查看 getView()。每次创建新视图时都会创建一个新的视图持有者。您需要将 onClickListener 设置为这个新创建的查看器中的按钮。

这是您修改后的 getView()。它未经测试，但应该给你正确的想法。祝你好运！

    public View getView(final int position, View convertView, ViewGroup parent) {
        ViewHolder mainViewholder;

//        convertView = null; you don't need this if you reuse the view properly
        if (convertView == null) {
            LayoutInflater inflater = LayoutInflater.from(getContext());
            convertView = inflater.inflate(layout, parent, false);
            mainViewholder = new ViewHolder();
            convertView.setTag(mainViewholder);
        } else {
            // If you are reusing a view, you may need to reset values in its view holder.
            mainViewholder = (ViewHolder) convertView.getTag();
        }

        // You always need to set you viewholder member variables whether creating a new
        // view or converting an old view.
        mainViewholder.img = (ImageView) convertView.findViewById(R.id.list_item_thumbnail);
        mainViewholder.img.setImageResource(IMAGE_ID[0]);
        mainViewholder.title = (TextView) convertView.findViewById(R.id.list_item_text);
        mainViewholder.title.setText(getItem(position));
        mainViewholder.button = (Button) convertView.findViewById(R.id.list_item_btn);
        mainViewholder.stop_button = (Button) convertView.findViewById(R.id.list_item_stop_btn);

        final ViewHolder vh = mainViewholder; // final to use in the click listener
        mainViewholder.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    vh.button.setVisibility(View.INVISIBLE);
                    radioLinks(gelenurl[position]);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

Answer 2

您每次都获取最后一个 ID 或最后一行位置，因为最后一个视图最后呈现

要获得按钮点击时的行位置，您可以将 postion 设置为按钮的标签，并在 onclickListner

中检查该标签

例如在您的

getview()

方法将位置作为标签放入 viewholder.btn

viewHolder.btn.setTag(position);

并在 OnClickListner

检查标签

int position = (int)v.getTag();

供参考

setVisibility调整自定义Listview中的错误按钮

setVisibility adjusts wrong button in custom Listview

android

listview

onclick

android-custom-view

android-button