android-视图持有人稳定性问题

我正在将数据上传到服务器,并且如果数据成功上传到服务器,那么我会显示“已保存”,就像您可以看到图像的“已上传”一样.

但是问题是,我已经为第一行存储了数据,而在不同的行项目中获取了“已保存”文本

holder.textDataStatus.setText(ImageList.get(position).getData());

protected void onPostExecute(String file_url) {
  // dismiss the dialog once product deleted
  pDialog.dismiss();

  try {

       // Prepare Save Data
       if(strStatusId.equals("0"))
       {
              Toast.makeText(UploadImagesActivity.this, "Unable to upload", Toast.LENGTH_SHORT).show();
                }
                else if (strStatusId.equals("1"))
                {
                    Toast.makeText(UploadImagesActivity.this, "Data Uploaded Successfully", Toast.LENGTH_SHORT).show();
                    ImageList.get(position).setData("Saved");               
                    Log.d("strData:", fileName); // getting correct tapped item
                    mAdapter.notifyDataSetChanged();
                }
                else
                {
                    Toast.makeText(UploadImagesActivity.this, "Unable to upload", Toast.LENGTH_SHORT).show();
                }

                } catch (Exception e) {
                    // TODO: handle exception
                }


           if (file_url != null){
                Toast.makeText(UploadImagesActivity.this, file_url, Toast.LENGTH_LONG).show();
           }

解决方法:

问题是您的适配器不知道该行的数据已上载到服务器.您需要告诉适配器.至于问题“如何告诉适配器？”,您已经有一个列表ImageList.我们只需要编辑它.

现在,向您的MyData类添加另一个布尔值,例如：boolean Uploaded = false;并为其创建getter setter.

将以下行添加到您的getView()中：

if(ImageList.get(position).isUploaded()){
    holder.btnUpload.setText("Save");
}else{
    holder.btnUpload.setText("Upload");
}

现在,我们需要在上传完成后将此值设置为true.我们应该只从UploadData类中执行此操作.为此,我们需要将位置发送到UploadData类.我们可以通过如下构造函数来做到这一点：

class UploadData extends AsyncTask<String, String, String> {
    private ProgressDialog pDialog;

    int position;

    //constructor to pass position of row, on which button was clicked to class
    public UploadData(int position){
        this.position=position;
    }

     /**
    * Before starting background thread Show Progress Dialog
    * */

    .
    .
    .
    .

   protected void onPostExecute(String file_url) {
       // dismiss the dialog once product deleted
       pDialog.dismiss();

       //after upload is done, set value to true
       ImageList.get(position).setUploaded(true);
       //now we need to notify our adapter so that it can reflect changes
       mAdapter.notifyDataSetChanged();
    .
    .

现在,根据您当前的代码,我认为通过构造函数将位置值传递给UploadData确实很困难.因此,您可以通过在类的全局变量中设置一个值来尝试.

编辑1：

将位置传递给您的holder.btnData.SetOnClickListener中的全局变量,如下所示：

holder.btnData.setOnClickListener(new OnClickListener() {

            @SuppressWarnings("deprecation")
            @Override
            public void onClick(View v) {
                //pass position into activity's global variable
                pos = position/*position from adapter*/;
                strPath = ImageList.get(position).getImages().toString();
                fileName = strPath.substring(strPath.lastIndexOf('/') + 1, strPath.length());                                      

                showDialog(DIALOG_DATA);

            }
        });

如果您需要任何解释,请发表评论.

标签：android-viewholder,listview,android
来源： https://codeday.me/bug/20191028/1952966.html