在setOnClickListener((内部，我正在运行"进度"对话框并调用函数在服务器上上传文件
btnUpload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!imageFilePath.equals(("")))
if (imageFilePath != null) {
dialog = new ProgressDialog(MainActivity.this);
dialog.setMessage("Uploading image...");
dialog.setCancelable(false);
dialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
dialog.show();
new Thread(new Runnable() {
@Override
public void run() {
uploadFile(fileForUpload);
}
}).start();
} else {
Toast.makeText(MainActivity.this, "Please choose a File First", Toast.LENGTH_SHORT).show();
}
}
});
}
public int uploadFile(final String selectedFilePath) {
int serverResponseCode = 0;
HttpURLConnection connection;
DataOutputStream dataOutputStream;
String lineEnd = "rn";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File selectedFile = new File(selectedFilePath);
String[] parts = selectedFilePath.split("/");
final String fileName = parts[parts.length - 1];
if (!selectedFile.isFile()) {
dialog.dismiss();
runOnUiThread(new Runnable() {
@Override
public void run() {
//tvFileName.setText("Source File Doesn't Exist: " + selectedFilePath);
}
});
return 0;
} else {
try {
FileInputStream fileInputStream = new FileInputStream(selectedFile);
URL url = new URL(SERVER_URL);
connection = (HttpURLConnection) url.openConnection();
connection.setConnectTimeout(60000);
connection.setDoInput(true);//Allow Inputs
connection.setDoOutput(true);//Allow Outputs
connection.setUseCaches(false);//Don't use a cached Copy
connection.setRequestMethod("POST");
connection.setRequestProperty("Connection", "Keep-Alive");
connection.setRequestProperty("ENCTYPE", "multipart/form-data");
connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
connection.setRequestProperty("uploaded_file", selectedFilePath);
//creating new dataoutputstream
dataOutputStream = new DataOutputStream(connection.getOutputStream());
//writing bytes to data outputstream
dataOutputStream.writeBytes(twoHyphens + boundary + lineEnd);
dataOutputStream.writeBytes("Content-Disposition: form-data; name="uploaded_file";filename=""
+ selectedFilePath + """ + lineEnd);
dataOutputStream.writeBytes(lineEnd);
//returns no. of bytes present in fileInputStream
bytesAvailable = fileInputStream.available();
//selecting the buffer size as minimum of available bytes or 1 MB
bufferSize = Math.min(bytesAvailable, maxBufferSize);
//setting the buffer as byte array of size of bufferSize
buffer = new byte[bufferSize];
//reads bytes from FileInputStream(from 0th index of buffer to buffersize)
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
//loop repeats till bytesRead = -1, i.e., no bytes are left to read
while (bytesRead > 0) {
//write the bytes read from inputstream
dataOutputStream.write(buffer, 0, bufferSize);
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
dataOutputStream.writeBytes(lineEnd);
dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
serverResponseCode = connection.getResponseCode();
String serverResponseMessage = connection.getResponseMessage();
Log.i("NETWORK", "Server Response is: " + serverResponseMessage + ": " + serverResponseCode);
//response code of 200 indicates the server status OK
if (serverResponseCode == 200) {
runOnUiThread(new Runnable() {
@Override
public void run() {
//tvFileName.setText("File Upload completed.nn You can see the uploaded file here: nn" + "http://coderefer.com/extras/uploads/"+ fileName);
Toast.makeText(MainActivity.this, "Image is uploaded!", Toast.LENGTH_SHORT);
}
});
} else
{
Toast.makeText(MainActivity.this, "Error while uploading file!", Toast.LENGTH_SHORT);
}
//closing the input and output streams
fileInputStream.close();
dataOutputStream.flush();
dataOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this, "File Not Found", Toast.LENGTH_SHORT).show();
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "URL error!", Toast.LENGTH_SHORT).show();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(MainActivity.this, "Cannot Read/Write File!", Toast.LENGTH_SHORT).show();
}
dialog.dismiss();
return serverResponseCode;
}
}
如何设置"取消"按钮以停止上传文件的线程？
使用同时具有cancel()和isCancelled()方法的AsyncTask实现后台操作。