Question

我在这里使用以下代码。现在我的网格显示长按下载按钮。如果我长按另一个项目它显示按钮。但问题是前一个按钮在那里。我想隐藏旧的。（隐藏旧的下载按钮新的长按另一个网格项目。）

我该怎么办？请检查一下并给我一个实现这部分的想法吗？

   bookGrid.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view,
                final int position, long id) {                  
            downloadImg=(ImageView) view.findViewById(R.id.download);       
            shareImg=(ImageView) view.findViewById(R.id.share);     
            downloadImg.setVisibility(View.VISIBLE);        
            shareImg.setVisibility(View.VISIBLE);       

    }}

提前完成。

Answer 1

这可能有助于同样的活动。

grid1.setOnItemLongClickListener(new OnItemLongClickListener() {

        @Override
        public boolean onItemLongClick(AdapterView<?> parent, View view,
                final int position, long id) {                  
            downloadImg1=(ImageView) view.findViewById(R.id.download1);       
            shareImg1=(ImageView) view.findViewById(R.id.share1);     
            downloadImg1.setVisibility(View.VISIBLE);        
            shareImg1.setVisibility(View.VISIBLE); 
            downloadImg2=(ImageView) view.findViewById(R.id.download2);       
            shareImg2=(ImageView) view.findViewById(R.id.share2);     
            downloadImg2.setVisibility(View.GONE);        
            shareImg2.setVisibility(View.GONE); 


    }}
grid2.setOnItemLongClickListener(new OnItemLongClickListener() {

            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view,
                    final int position, long id) {                  
                downloadImg1=(ImageView) view.findViewById(R.id.download1);       
                shareImg1=(ImageView) view.findViewById(R.id.share1);     
                downloadImg1.setVisibility(View.GONE);        
                shareImg1.setVisibility(View.GONE);
                downloadImg2=(ImageView) view.findViewById(R.id.download2);       
                shareImg2=(ImageView) view.findViewById(R.id.share2);     
                downloadImg2.setVisibility(View.VISIBLE);        
                shareImg2.setVisibility(View.VISIBLE);

        }}

Answer 2

如果您使用自定义适配器。您可以在CustomAdapter方法中创建setButtonVisible（int position）。并在getView中检查此设置位置并在视图中显示或隐藏Button。你的方法onClick kwill是这样的：

public boolean onItemLongClick(AdapterView<?> parent, View view,
    final int position, long id) {                  
    adapter.setButtonVisible(position);
    adapter.notifyDataSetChanged();
}

Answer 3

你可以：

使用最后一个按钮创建一个字段或最终变量。在onItemLongClick中检查它是否为null然后使其不可见。在onItemLongClick的末尾用当前按钮填充字段变量。在您的情况下（使用提供的代码，我建议下载和shareImg是可以单击的所有视图共有的最终变量）：

bookGrid.setOnItemLongClickListener（new OnItemLongClickListener（）{

@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
        final int position, long id) {                  
    if (downloading != null) {
        downloadImg.setVisibility(View.INVISIBLE);
    }
    if (shareImg != null) {
        shareImg.setVisibility(View.INVISIBLE);
    }

    downloadImg=(ImageView) view.findViewById(R.id.download);       
    shareImg=(ImageView) view.findViewById(R.id.share);     
    downloadImg.setVisibility(View.VISIBLE);        
    shareImg.setVisibility(View.VISIBLE);

}}

一段时间后，按钮会消失。但在这种情况下，变量应该是方法范围。例如。：

    final ImageView downloadImg=(ImageView) view.findViewById(R.id.download);       
    shareImg=(ImageView) view.findViewById(R.id.share);     
    downloadImg.setVisibility(View.VISIBLE);        
    shareImg.setVisibility(View.VISIBLE);    
    downloadImg.postDelayed(new Runnable(){
        @Override
        public void run() {
            downloadImg.setVisibility(View.INVISIBLE);
        }
   }, 1000);

Answer 4

您可以记住以前长按的项目：

private View previousItem;

bookGrid.setOnItemLongClickListener(new OnItemLongClickListener() {
    @Override
    public boolean onItemLongClick(AdapterView<?> parent, View view,
            final int position, long id) {                  
        if (previousItem != null) {
            downloadImg=(ImageView) previousItem.findViewById(R.id.download);       
            shareImg=(ImageView) previousItem.findViewById(R.id.share);     
            downloadImg.setVisibility(View.GONE);        
            shareImg.setVisibility(View.GONE);       
        }
        downloadImg=(ImageView) view.findViewById(R.id.download);
        shareImg=(ImageView) view.findViewById(R.id.share);
        downloadImg.setVisibility(View.VISIBLE);
        shareImg.setVisibility(View.VISIBLE);
        previousItem = view;
    }
}

长按show button按下android gridview中的网格项

4 个答案: