我使用for循环将所有列表项目图像上传到服务器，我也可以上传它们，但我担心的是为什么我没有获得每个列表项的状态。
就像我在列表中有8个项目并且我的上传所有按钮上传所有列表项目图像到服务器成功，但我获得50％列表项目的状态而100％项目上传..可能是什么原因？< / p>
例如：我在列表中有8个项目，从缩略图1到缩略图8，当我点击上传全部按钮时，我成功获取服务器上的所有8个图像，但在我的列表中显示仅上传了4或5条记录为什么？
这是我的代码：
btnUploadAll.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
for (int i=0; i<ImageList.size(); i++)
{
new UploadFileAsync().execute(String.valueOf(i));
}
}
});
以下是完整的代码： -
public class MainActivity extends Activity {
static ListView lstView;
private Handler handler = new Handler();;
static List<MyData> ImageList;
String strPath;
int position;
File newFile;
ViewHolder holder;
View v;
String fileName;
ImageAdapter mAdapter;
Button btnUploadAll;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnUploadAll = (Button) findViewById(R.id.btnUploadAll);
btnUploadAll.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
for (int i=0; i<ImageList.size(); i++)
{
new UploadFileAsync().execute(String.valueOf(i));
}
}
});
/*** Get Images from SDCard ***/
ImageList = getSD();
// ListView and imageAdapter
lstView = (ListView) findViewById(R.id.listView);
mAdapter = new ImageAdapter(this);
lstView.setAdapter(mAdapter);
}
private List<MyData> getSD() {
List<MyData> it = new ArrayList<MyData>();
String root_sd = Environment.getExternalStorageDirectory().toString();
File f = new File(root_sd + "/mydata");
File[] files = f.listFiles();
for (int i = 0; i < files.length; i++) {
File file = files[i];
Log.d("Count", file.getPath());
MyData data = new MyData();
data.setImages(file.getPath());
data.setStatusEnable(true);
it.add(data);
}
return it;
}
static class ViewHolder {
public ViewHolder(View convertView) {
// TODO Auto-generated constructor stub
}
TextView textName;
ImageView thumbnail;
TextView textStatus;
Button btnUpload;
}
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 (convertView == null) {
convertView = getLayoutInflater().inflate(
R.layout.adapter_main, null);
holder = new ViewHolder(convertView);
// Create a ViewHolder and store references to the children
// views
holder.textName = (TextView) convertView
.findViewById(R.id.textName);
holder.thumbnail = (ImageView) convertView
.findViewById(R.id.thumbnail);
holder.btnUpload = (Button) convertView
.findViewById(R.id.btnUpload);
holder.textStatus = (TextView) convertView
.findViewById(R.id.textStatus);
// The tag can be any Object, this just happens to be the
// ViewHolder
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.btnUpload.setEnabled(ImageList.get(position)
.isStatusEnable());
holder.textStatus.setText(ImageList.get(position).getMessage());
strPath = ImageList.get(position).getImages().toString();
// Get File Name
fileName = strPath.substring(strPath.lastIndexOf('/') + 1,
strPath.length());
File file = new File(strPath);
@SuppressWarnings("unused")
long length = file.length();
holder.textName.setText(fileName);
final BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bm = BitmapFactory.decodeFile(strPath, options);
holder.thumbnail.setImageBitmap(bm);
// btnUpload
holder.btnUpload.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Upload
startUpload(position);
}
});
return convertView;
}
}
// Upload
public void startUpload(final int position) {
Runnable runnable = new Runnable() {
public void run() {
handler.post(new Runnable() {
public void run() {
v = lstView.getChildAt(position
- lstView.getFirstVisiblePosition());
holder = (ViewHolder) v.getTag();
synchronized (this) {
ImageList.get(position).setStatusEnable(false);
mAdapter.notifyDataSetChanged();
}
new UploadFileAsync().execute(String.valueOf(position));
}
});
}
};
new Thread(runnable).start();
}
// Async Upload
public class UploadFileAsync extends AsyncTask<String, Void, Void> {
private ProgressDialog pDialog;
String resServer;
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected Void doInBackground(String... params) {
position = Integer.parseInt(params[0]);
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
int resCode = 0;
String resMessage = "";
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
// File Path
String strSDPath = ImageList.get(position).getImages().toString();
// Upload to PHP Script
String strUrlServer = "http://10.0.2.2/uploadFile.php";
try {
/** Check file on SD Card ***/
File file = new File(strSDPath);
if (!file.exists()) {
resServer = "{\"StatusID\":\"0\",\"Message\":\"Please check path on SD Card\"}";
return null;
}
FileInputStream fileInputStream = new FileInputStream(new File(
strSDPath));
URL url = new URL(strUrlServer);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
DataOutputStream outputStream = new DataOutputStream(
conn.getOutputStream());
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream
.writeBytes("Content-Disposition: form-data; name=\"filUpload\";filename=\""
+ strSDPath + "\"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens
+ lineEnd);
// Response Code and Message
resCode = conn.getResponseCode();
if (resCode == HttpURLConnection.HTTP_OK) {
InputStream is = conn.getInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
int read = 0;
while ((read = is.read()) != -1) {
bos.write(read);
}
byte[] result = bos.toByteArray();
bos.close();
resMessage = new String(result);
}
Log.d("resCode=", Integer.toString(resCode));
Log.d("resMessage=", resMessage.toString());
fileInputStream.close();
outputStream.flush();
outputStream.close();
resServer = resMessage.toString();
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
protected void onPostExecute(Void unused) {
statusWhenFinish(position, resServer);
// dismiss the dialog once product deleted
pDialog.dismiss();
}
}
// When Upload Finish
@SuppressWarnings("unused")
protected void statusWhenFinish(int position, String resServer) {
/*** Default Value ***/
String strStatusID = "";
String strError = "";
try {
JSONObject c = new JSONObject(resServer);
strStatusID = c.getString("StatusID");
strError = c.getString("Message");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// // prepare Status
if (strStatusID.equals("0")) {
ImageList.get(position).setMessage("Failed");
ImageList.get(position).setStatusEnable(true);
mAdapter.notifyDataSetChanged();
} else if (strStatusID.equals("1")) {
ImageList.get(position).setMessage("Already Exists");
ImageList.get(position).setStatusEnable(false);
mAdapter.notifyDataSetChanged();
} else if(strStatusID.equals("2")) {
ImageList.get(position).setMessage("Uploaded");
ImageList.get(position).setStatusEnable(false);
mAdapter.notifyDataSetChanged();
} else {
}
}
/**
* Introduce a class with below attributes to hold a state of each row in
* single element
*
*/
public class MyData {
/* Image url or path of image in single row */
private String images;
/* anme of image in single row */
private String name;
/* status ID of image in single row */
private String statusID;
/* message of image in single row */
private String message;
private boolean statusEnable;
public boolean isStatusEnable() {
return statusEnable;
}
public void setStatusEnable(boolean statusEnable) {
this.statusEnable = statusEnable;
}
// Generate getters and setter
public String getImages() {
return images;
}
public void setImages(String images) {
this.images = images;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getStatusID() {
return statusID;
}
public void setStatusID(String statusID) {
this.statusID = statusID;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
}
答案 0 :(得分：1)
这可能与您的AsyncTask HTTP请求异步这一事实有关，而for循环是同步。
您所做的假设是UploadFileAsync的每个实例都是串行执行的。实际发生的是每个实例的doInBackground()方法同时执行（取决于CPU具有多少核心以及网络库是否支持并发线程池）。因此，在上传所有文件时，只有先完成的文件才会显示完成状态。
要解决此问题，请发布您的AsyncTask和ListView代码。
答案 1 :(得分：1)
public class MainActivity extends Activity {
static ListView lstView;
private Handler handler = new Handler();;
static List<MyData> ImageList;
String strPath;
int position;
File newFile;
ViewHolder holder;
View v;
String fileName;
ImageAdapter mAdapter;
Button btnUploadAll;
int i=0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnUploadAll = (Button) findViewById(R.id.btnUploadAll);
btnUploadAll.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
if(ImageList.size()!=0)
{
new UploadFileAsync().execute(String.valueOf(i));
}
}
});
/*** Get Images from SDCard ***/
ImageList = getSD();
// ListView and imageAdapter
lstView = (ListView) findViewById(R.id.listView);
mAdapter = new ImageAdapter(this);
lstView.setAdapter(mAdapter);
}
private List<MyData> getSD() {
List<MyData> it = new ArrayList<MyData>();
String root_sd = Environment.getExternalStorageDirectory().toString();
File f = new File(root_sd + "/mydata");
File[] files = f.listFiles();
for (int i = 0; i < files.length; i++) {
File file = files[i];
Log.d("Count", file.getPath());
MyData data = new MyData();
data.setImages(file.getPath());
data.setStatusEnable(true);
it.add(data);
}
return it;
}
static class ViewHolder {
public ViewHolder(View convertView) {
// TODO Auto-generated constructor stub
}
TextView textName;
ImageView thumbnail;
TextView textStatus;
Button btnUpload;
}
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 (convertView == null) {
convertView = getLayoutInflater().inflate(
R.layout.adapter_main, null);
holder = new ViewHolder(convertView);
// Create a ViewHolder and store references to the children
// views
holder.textName = (TextView) convertView
.findViewById(R.id.textName);
holder.thumbnail = (ImageView) convertView
.findViewById(R.id.thumbnail);
holder.btnUpload = (Button) convertView
.findViewById(R.id.btnUpload);
holder.textStatus = (TextView) convertView
.findViewById(R.id.textStatus);
// The tag can be any Object, this just happens to be the
// ViewHolder
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.btnUpload.setEnabled(ImageList.get(position)
.isStatusEnable());
holder.textStatus.setText(ImageList.get(position).getMessage());
strPath = ImageList.get(position).getImages().toString();
// Get File Name
fileName = strPath.substring(strPath.lastIndexOf('/') + 1,
strPath.length());
File file = new File(strPath);
@SuppressWarnings("unused")
long length = file.length();
holder.textName.setText(fileName);
final BitmapFactory.Options options = new BitmapFactory.Options();
Bitmap bm = BitmapFactory.decodeFile(strPath, options);
holder.thumbnail.setImageBitmap(bm);
// btnUpload
holder.btnUpload.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Upload
startUpload(position);
}
});
return convertView;
}
}
// Upload
public void startUpload(final int position) {
Runnable runnable = new Runnable() {
public void run() {
handler.post(new Runnable() {
public void run() {
v = lstView.getChildAt(position
- lstView.getFirstVisiblePosition());
holder = (ViewHolder) v.getTag();
synchronized (this) {
ImageList.get(position).setStatusEnable(false);
mAdapter.notifyDataSetChanged();
}
new UploadFileAsync().execute(String.valueOf(position));
}
});
}
};
new Thread(runnable).start();
}
// Async Upload
public class UploadFileAsync extends AsyncTask<String, Void, Void> {
private ProgressDialog pDialog;
String resServer;
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
@Override
protected Void doInBackground(String... params) {
position = Integer.parseInt(params[0]);
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
int resCode = 0;
String resMessage = "";
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
// File Path
String strSDPath = ImageList.get(position).getImages().toString();
// Upload to PHP Script
String strUrlServer = "http://10.0.2.2/uploadFile.php";
try {
/** Check file on SD Card ***/
File file = new File(strSDPath);
if (!file.exists()) {
resServer = "{\"StatusID\":\"0\",\"Message\":\"Please check path on SD Card\"}";
return null;
}
FileInputStream fileInputStream = new FileInputStream(new File(
strSDPath));
URL url = new URL(strUrlServer);
HttpURLConnection conn = (HttpURLConnection) url
.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setUseCaches(false);
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
DataOutputStream outputStream = new DataOutputStream(
conn.getOutputStream());
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream
.writeBytes("Content-Disposition: form-data; name=\"filUpload\";filename=\""
+ strSDPath + "\"" + lineEnd);
outputStream.writeBytes(lineEnd);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
// Read file
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
outputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(twoHyphens + boundary + twoHyphens
+ lineEnd);
// Response Code and Message
resCode = conn.getResponseCode();
if (resCode == HttpURLConnection.HTTP_OK) {
InputStream is = conn.getInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
int read = 0;
while ((read = is.read()) != -1) {
bos.write(read);
}
byte[] result = bos.toByteArray();
bos.close();
resMessage = new String(result);
}
Log.d("resCode=", Integer.toString(resCode));
Log.d("resMessage=", resMessage.toString());
fileInputStream.close();
outputStream.flush();
outputStream.close();
resServer = resMessage.toString();
} catch (Exception ex) {
ex.printStackTrace();
}
return null;
}
protected void onPostExecute(Void unused) {
if(i<imageList.size()){
i++;
new UploadFileAsync().execute(String.valueOf(i));
}
statusWhenFinish(position, resServer);
// dismiss the dialog once product deleted
pDialog.dismiss();
}
}
// When Upload Finish
@SuppressWarnings("unused")
protected void statusWhenFinish(int position, String resServer) {
/*** Default Value ***/
String strStatusID = "";
String strError = "";
try {
JSONObject c = new JSONObject(resServer);
strStatusID = c.getString("StatusID");
strError = c.getString("Message");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// // prepare Status
if (strStatusID.equals("0")) {
ImageList.get(position).setMessage("Failed");
ImageList.get(position).setStatusEnable(true);
mAdapter.notifyDataSetChanged();
} else if (strStatusID.equals("1")) {
ImageList.get(position).setMessage("Already Exists");
ImageList.get(position).setStatusEnable(false);
mAdapter.notifyDataSetChanged();
} else if(strStatusID.equals("2")) {
ImageList.get(position).setMessage("Uploaded");
ImageList.get(position).setStatusEnable(false);
mAdapter.notifyDataSetChanged();
} else {
}
}
/**
* Introduce a class with below attributes to hold a state of each row in
* single element
*
*/
public class MyData {
/* Image url or path of image in single row */
private String images;
/* anme of image in single row */
private String name;
/* status ID of image in single row */
private String statusID;
/* message of image in single row */
private String message;
private boolean statusEnable;
public boolean isStatusEnable() {
return statusEnable;
}
public void setStatusEnable(boolean statusEnable) {
this.statusEnable = statusEnable;
}
// Generate getters and setter
public String getImages() {
return images;
}
public void setImages(String images) {
this.images = images;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getStatusID() {
return statusID;
}
public void setStatusID(String statusID) {
this.statusID = statusID;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
}
}
答案 2 :(得分：0)
我的建议是，不是在AsynTask循环中循环for，而是循环for循环，以便在doInBackground() <{1}}的{{1}}方法中上传>