问题：
使用ViewHolder显示ListView中最后一个列表项的状态
杨宏儒
int globalPosition ;
..............
buttonAllData.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new UploadBulkData(globalPosition).execute();
}
});
........
class UploadBulkData extends AsyncTask<String, String, String> {
private ProgressDialog pDialog;
int dataPosition;
public UploadBulkData(int position){
this.dataPosition = position;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(UploadActivity.this);
pDialog.setMessage("Uploading...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
.......
String url = "http://web/uploadBulk.php";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("UserData", st));
String resultServer = getHttpPost(url,params);
Log.d("Entire string::", " " + resultServer);
/*** Default Value ***/
strStatusID = "0";
strError = "";
JSONObject jsonObject;
try {
jsonObject = new JSONObject(resultServer);
strStatusID = jsonObject.getString("StatusID");
strError = jsonObject.getString("Message");
} catch (JSONException e) {
e.printStackTrace();
}
}
return null;
}
protected void onPostExecute(String file_url) {
pDialog.dismiss();
fileNameDB=ImageList.get(globalPosition).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
if(strStatusID.equals("1"))
{
Toast.makeText(UploadActivity.this, "Data Uploaded Successfully", Toast.LENGTH_SHORT).show();
long saveImge = myDbbv.InsertData(fileNameDB);
Log.d("fileNameDB:UP", String.valueOf(saveImge));
}
else
{
Toast.makeText(UploadActivity.this, "Unable to upload Data", Toast.LENGTH_SHORT).show();
}
if (file_url != null){
Toast.makeText(UploadActivity.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
在getView中，我使用了如下内容：
public View getView(final int position, View convertView, ViewGroup parent) {
holder.dataImageView.setImageResource(R.drawable.bullet_button);
try {
// check data exist or not
boolean strDataExistU = myDbbv.Exists(fileNameDB);
if(strDataExistU)
{
holder.dataImageView.setImageResource(R.drawable.online);
}
else
{
boolean strDataExist = myDb.Exists(fileNameDB);
if(strDataExist)
{
holder.dataImageView.setImageResource(R.drawable.local);
}
else
{
holder.dataImageView.setImageResource(R.drawable.default);
}
}
} catch (Exception e) {
}
}
正如您在getView（…）方法中所看到的，我使用了三种不同类型的绘图（即：-在线、本地、默认）
如果在线节目数据已上载到在线服务器，则本地节目已添加到本地数据库，默认为….（既不上载到服务器，也不存储到本地数据库）
问题：
每当我进行批量上传时，只能在线绘制列表中的最后一行项目，而我已经将整个列表项目数据上传到服务器
我只是想显示所有的列表项目，我上传到服务器上的在线绘图，否则我的代码工作得很好。。。
几乎完整的代码：
public class UploadActivity extends Activity {
int globalPosition ;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_upload);
ImageButton buttonAllData = (ImageButton) findViewById(R.id.btnMenus);
buttonAllData.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
new UploadBulkData(globalPosition).execute();
}
});
/*** Get Images from SDCard ***/
ImageList = getSD();
// ListView and imageAdapter
lstView = (ListView) findViewById(R.id.listView1);
lstView.setAdapter(new ImageAdapter(this));
totalItems = ""+ lstView.getAdapter().getCount();
}
public static List <String> getSD()
{
List <String> it = new ArrayList <String>();
String string = "/mnt/sdcard/Pictures/Joseph/";
f = new File (string+ CameraLauncherActivity.folder+ "/");
files = f.listFiles ();
/***
* to show last taken image on top using lastModified
* to sort data
* to refresh data after (remove or update)
*/
Arrays.sort(files, new Comparator<Object>()
{
public int compare(Object o1, Object o2) {
if (((File)o1).lastModified() > ((File)o2).lastModified()) {
return -1;
} else if (((File)o1).lastModified() < ((File)o2).lastModified()) {
return +1;
} else {
return 0;
}
}
});
// <<<<<<<<< END >>>>>>>>>>>
for (int i = 0; i < files.length; i++)
{
file = files[i];
Log.d("Count",file.getPath());
it.add (file.getPath());
}
return it;
}
static class ViewHolder {
public ViewHolder(View convertView) {
// TODO Auto-generated constructor stub
}
TextView imageNameTextView;
ImageView sdCardImageView, statusImageView, dataImageView;
ProgressBar uploadProgressBar;
ImageButton uploadImageButton, dataImageButton;
boolean isUploading = false;
}
public class ImageAdapter extends BaseAdapter
{
public ImageAdapter(Context c)
{
}
public int getCount() {
// TODO Auto-generated method stub
return ImageList.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Avoid unneccessary calls to findViewById() on each row, which is expensive!
holder = null;
// If this item is to be synced
if(flags.get(position)) {
startUpload(position);
// Mark as synced
flags.put(position, false);
}
/*
* If convertView is not null, we can reuse it directly, no inflation required!
* We only inflate a new View when the convertView is null.
*/
if (convertView == null) {
convertView = getLayoutInflater().inflate(R.layout.list_upload, null);
holder = new ViewHolder(convertView);
// Create a ViewHolder and store references to the children views
holder.imageNameTextView = (TextView) convertView.findViewById(R.id.ColImgName);
holder.sdCardImageView = (ImageView) convertView.findViewById(R.id.ColImgPath);
holder.statusImageView = (ImageView) convertView.findViewById(R.id.ColStatus);
holder.uploadProgressBar = (ProgressBar) convertView.findViewById(R.id.progressBar);
holder.uploadImageButton = (ImageButton) convertView.findViewById(R.id.btnUpload);
holder.dataImageButton = (ImageButton) convertView.findViewById(R.id.btnData);
holder.dataImageView = (ImageView) convertView.findViewById(R.id.dataExist);
// The tag can be any Object, this just happens to be the ViewHolder
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
strPath = ImageList.get(position).toString();
// Get File Name
fileName = strPath.substring( strPath.lastIndexOf('_')+1, strPath.length() );
file = new File(strPath);
@SuppressWarnings("unused")
long length = file.length();
holder.imageNameTextView.setText(fileName);
fileName=ImageList.get(position).toString().substring
(strPath.lastIndexOf('_')+1, strPath.length());
fileNameDB=ImageList.get(position).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 8;
Bitmap bm = BitmapFactory.decodeFile(strPath,options);
holder.sdCardImageView.setImageBitmap(bm);
if(holder.isUploading) {
holder.uploadProgressBar.setVisibility(View.VISIBLE);
} else {
holder.uploadProgressBar.setVisibility(View.GONE);
}
holder.dataImageView.setImageResource(R.drawable.bullet_button);
try {
// check data exist or not
boolean strDataExistU = myDbbv.Exists(fileNameDB);
if(strDataExistU)
{
holder.dataImageView.setImageResource(R.drawable.online);
}
else
{
// check data exist or not
boolean strDataExist = myDb.Exists(fileNameDB);
if(strDataExist)
{
holder.dataImageView.setImageResource(R.drawable.database);
}
else
{
holder.dataImageView.setImageResource(R.drawable.default);
}
}
} catch (Exception e) {
// TODO: handle exception
}
fileName = ImageList.get(position).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
try {
boolean strExist = myDbb.Exists(fileName);
if(strExist)
{
holder.statusImageView.setImageResource(R.drawable.onl);
}
else
{
holder.statusImageView.setImageResource(R.drawable.bullet_button);
}
} catch (Exception e) {
// TODO: handle exception
}
// btnData
holder.dataImageButton.setOnClickListener(new View.OnClickListener() {
@SuppressWarnings("deprecation")
public void onClick(View v) {
// Print
globalPosition = position;
fileName=ImageList.get(position).toString().substring
(strPath.lastIndexOf('_')+1, strPath.length());
fileNameDB=ImageList.get(position).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
showDialog(DIALOG_LOGIN);
}
});
return convertView;
}
}
class UploadData extends AsyncTask<String, String, String> {
private ProgressDialog pDialog;
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(UploadActivity.this);
pDialog.setMessage("Uploading...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
String url = "http://web/uploadData.php";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("sImageName", fileNameDB));
Log.d("sImageName::", fileNameDB);
String resultServer = getHttpPost(url,params);
Log.d("Entire string::", " " + resultServer);
/*** Default Value ***/
strStatusID = "0";
strError = "";
JSONObject c;
try {
c = new JSONObject(resultServer);
strStatusID = c.getString("StatusID");
strError = c.getString("Error");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
try {
fileName=ImageList.get(globalPosition).toString().substring
(strPath.lastIndexOf('_')+1, strPath.length());
fileNameDB=ImageList.get(globalPosition).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
// prepare save data
if(strStatusID.equals("0"))
{
Toast.makeText(getApplicationContext(), "Unable to upload Data",
Toast.LENGTH_LONG).show();
}
else if (strStatusID.equals("1"))
{
Toast.makeText(getApplicationContext(), "Data Uploaded Successfully!",
Toast.LENGTH_SHORT).show();
// Save Data
long saveImge = myDbbv.InsertData(fileNameDB);
Log.d("fileNameDB:UP", String.valueOf(saveImge));
} else {
Toast.makeText(getApplicationContext(), "Unable to upload Data",
Toast.LENGTH_LONG).show();
}
} catch (Exception e) {
// TODO: handle exception
}
if (file_url != null){
Toast.makeText(UploadActivity.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
});
cancelButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
alertDialog.dismiss();
}
});
closeButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
alertDialog.dismiss();
}
});
}
}
class UploadBulkData extends AsyncTask<String, String, String> {
private ProgressDialog pDialog;
int dataPosition;
//constructor to pass position of row, on which button was clicked to class
public UploadBulkData(int position){
this.dataPosition = position;
}
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(UploadActivity.this);
pDialog.setMessage("Uploading...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
String url = "http://web/uploadBulk.php";
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("EventData", st));
String resultServer = getHttpPost(url,params);
Log.d("Entire string::", " " + resultServer);
/*** Default Value ***/
strStatusID = "0";
strError = "";
JSONObject jsonObject;
try {
jsonObject = new JSONObject(resultServer);
strStatusID = jsonObject.getString("StatusID");
strError = jsonObject.getString("Message");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once product deleted
pDialog.dismiss();
// Prepare Save Data
if(strStatusID.equals("1"))
{
Toast.makeText(UploadActivity.this, "Data Uploaded Successfully", Toast.LENGTH_SHORT).show();
fileNameDB=ImageList.get(dataPosition).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
// Save Data
long saveImge = myDbbv.InsertData(fileNameDB);
Log.d("fileNameDB:UP", String.valueOf(saveImge));
}
else
{
Toast.makeText(UploadActivity.this, "Unable to upload Data", Toast.LENGTH_SHORT).show();
}
if (file_url != null){
Toast.makeText(UploadActivity.this, file_url, Toast.LENGTH_LONG).show();
}
}
}
共有3个答案
米浩穰
可以有多种可定制的方法来实现这一点。其中一个已经回答了。请纠正我，如果我对您的要求有误，请在列表到达最后一项时通知您。之后，您将使用最后一个项索引执行一个操作。
[更新]
对于此解决方案：您必须迁移到Recycler View，因为它更灵活、更快且针对批量数据进行了优化。
int findFirstVisibleItemPosition();
int findFirstCompletelyVisibleItemPosition();
int findLastVisibleItemPosition(); // This function could be the one you're looking for.
int findLastCompletelyVisibleItemPosition();
用法：
// In Java
GridLayoutManager layoutManager = ((GridLayoutManager)mRecyclerView.getLayoutManager());
int firstVisiblePosition = layoutManager.findFirstVisibleItemPosition();
参考：https://stackoverflow.com/a/25053500/16176653
翟宏放
在上传数据和上传批量数据中，似乎使用了完全相同的代码来更新上传的数据库：myDbbv.InsertData（fileNameDB）。这只会将上传的bulkdata的最后一个文件标记为正在上传，这与您看到的问题行为一致。
尝试为UploadData中上传的每个文件更新myDbbv，看看是否有帮助。
艾俊晖
问题在holder.dataImageButton中。setOnClickListener方法块中，分配给全局位置的位置值（globalPosition=position；）是传递给getView方法的值（每次循环视图时都会调用getView）。所以你们应该把位置设置为holder。dataImageButton标记并在setOnClickListener方法块内从中检索。
所以在ImageButton标签中设置holder.data位置
holder.dataImageButton.setTag(position);
在代码行之后
holder.dataImageView.setImageResource(R.drawable.bullet_button);
并将您的setOnClickListener方法修改为
holder.dataImageButton.setOnClickListener(new View.OnClickListener() {
@SuppressWarnings("deprecation")
public void onClick(View v) {
// Print
globalPosition = (Integer)v.getTag(); //modified
fileName=ImageList.get(position).toString().substring
(strPath.lastIndexOf('_')+1, strPath.length());
fileNameDB=ImageList.get(position).toString().substring
(strPath.lastIndexOf('/')+1, strPath.length());
showDialog(DIALOG_LOGIN);
}
});
类似资料：
-
我是android的新手。我已经创建了一个抽屉菜单，并在其中制作了菜单，通过添加片段来实现。现在，对于每个菜单，我都想创建一个带有数组适配器类的自定义列表视图。我实现了它，但问题是列表的每一项中的标题和地址都是相同的。列表只显示最后一项。有人能帮我吗？！我想不出解决方案。这里有一些代码和一张照片： 数组适配器类： 公园班： 一排的公园布局： 列表视图的屏幕截图，所有项目的标题和地址相同
-
我在我的列表视图中添加了一个可绘制的分隔线，但它出现在除最后一项之外的所有项目中。 我在列表中只有5个项目，所以在最后一个项目之后都是空白，我想在最后一项之后也有一个分隔符 我试过这个： 在我的列表视图中。但它不起作用 非常感谢。
-
问题内容： 我的ListView自定义适配器（及其新实现的viewHolder）存在一些问题。我有一个ListView，每个项目都有一个复选框（这里没有新内容）。问题是，如果列表中有9个以上的项目，则当我选中第一个复选框时，将自动检查第10个复选框（第二个和第11个复选框相同），就像两个项目都有一个监听器一样（我相信情况确实如此）。 我在这里阅读了有关listView的位置问题，视图回收以及Vie
-
我试图使用文本视图来显示从列表视图中选择的联系人。列表视图包含用户从加载到列表视图中的Android电话簿中选择的联系人。文本视图将只显示列表视图中的最后一项，即使用户选择了另一个不是列表视图中最后一个联系人的联系人。 即使在我的日志打印中，我可以看到我选择了哪个联系人，但当我试图将其打印到另一个窗口中的文本视图时，它仍然默认为最后一个联系人。 添加调制解调器。JAVA 主要活动。JAVA
-
null null
-
当新项目添加到视图中时，我试图使我的listview移动到最后一个项目。有了textview，我可以通过这样做来实现这一点 但对于带有适配器的listview，我似乎无法找到调用的方法。我的适配器设置