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 中我使用的是这样的东西：
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(...) 方法中看到的，我使用了三种不同类型的可绘制对象（即：- 在线、本地、默认）
在线显示数据已经上传到在线服务器，本地显示已经添加到本地数据库和默认..（既没有上传到服务器也没有存储到本地数据库）
问题：
每当我进行批量上传时，只为列表中的最后一行项目获取在线可绘制对象，而我已经将整个列表项数据上传到服务器
我只想显示所有列表项的在线可绘制对象，那些我已经上传到服务器的，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();
}
}
}
问题在 holder.dataImageButton.setOnClickListener 方法块中，您分配给 globalPosition (
globalPosition = position;所以在 holder.dataImageButton 标签中设置位置
holder.dataImageButton.setTag(position);
在你的代码行之后
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);
}
});
似乎在
UploadDataUploadBulkDatamyDbbv.InsertData(fileNameDB)UploadBulkData尝试为
myDbbvUploadData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。如果我对您的要求有误，请纠正我，当列表到达最后一项时，您需要得到通知。之后，您将对最后一个项目索引执行操作。
[更新]
对于此解决方案：您必须迁移到 Recycler View，因为它更灵活、更快速并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();
直接使用
ImageList.get(position).toString()strPath = ImageList.get(position).toString()