我正在尝试将文件上传到服务器。文件成功上传，但我的问题是进度对话框直接进入0到100％或（0-50％-100％）。它不会根据文件上传显示。请告诉我们应该在这段代码中编辑什么...
public class ShowStudent extends AppCompatActivity implements View.OnClickListener{
private TextView messageText;
private Button uploadButton, btnselectfile;
private int serverResponseCode = 0;
private ProgressDialog dialog = null;
private String upLoadServerUri = null;
private String filePath=null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_student);
uploadButton = (Button)findViewById(R.id.uploadButton);
messageText = (TextView)findViewById(R.id.messageText);
btnselectfile = (Button)findViewById(R.id.button_selectfile);
uploadButton.setOnClickListener(this);
upLoadServerUri = "http://onsitesupport.info/diary/uploadproject.php";
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
if(ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED){
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},100);
return;
}
}
enable_button();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if(requestCode == 100 && (grantResults[0] == PackageManager.PERMISSION_GRANTED)){
enable_button();
}else {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
requestPermissions(new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},100);
}
}
}
@Override
public void onClick(View arg0) {
if (arg0==uploadButton) {
dialog =new ProgressDialog(ShowStudent.this);
dialog.setIndeterminate(false);
dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
dialog.setCancelable(true);
dialog.setMax(100);
dialog.show();
messageText.setText("uploading started.....");
new Thread(new Runnable() {
public void run() {
uploadFile(filePath);
}
}).start();
}
}
public void enable_button(){
btnselectfile.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
new MaterialFilePicker()
.withActivity(ShowStudent.this)
.withRequestCode(10)
.withFilterDirectories(true)
.start();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 10 && resultCode == RESULT_OK) {
File f = new File(data.getStringExtra(FilePickerActivity.RESULT_FILE_PATH));
filePath = f.getAbsolutePath();
// String mimeType= URLConnection.guessContentTypeFromName(f.getName());
messageText.setText("Uploading file path:" +filePath);
}
}
public int uploadFile(String sourceFileUri) {
String fileName = sourceFileUri;
HttpURLConnection conn = null;
DataOutputStream dos = null;
String lineEnd = "\r\n";
String twoHyphens = "--";
String boundary = "*****";
int bytesRead, bytesAvailable, bufferSize;
byte[] buffer;
int maxBufferSize = 1 * 1024 * 1024;
File sourceFile = new File(sourceFileUri);
if (!sourceFile.isFile()) {
dialog.dismiss();
Log.e("uploadFile", "Source File not exist :"+filePath);
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Source File not exist :"+filePath);
}
});
return 0;
}
else
{
try {
// open a URL connection to the Servlet
FileInputStream fileInputStream = new FileInputStream(sourceFile);
URL url = new URL(upLoadServerUri);
// Open a HTTP connection to the URL
conn = (HttpURLConnection) url.openConnection();
conn.setDoInput(true); // Allow Inputs
conn.setDoOutput(true); // Allow Outputs
conn.setUseCaches(false); // Don't use a Cached Copy
conn.setRequestMethod("POST");
conn.setRequestProperty("Connection", "Keep-Alive");
conn.setRequestProperty("ENCTYPE", "multipart/form-data");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
conn.setRequestProperty("uploaded_file", fileName);
dos = new DataOutputStream(conn.getOutputStream());
dos.writeBytes(twoHyphens + boundary + lineEnd);
dos.writeBytes("Content-Disposition: form-data; name=\"uploaded_file\";filename=\""
+ fileName + "\"" + lineEnd);
dos.writeBytes(lineEnd);
// create a buffer of maximum size
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
buffer = new byte[bufferSize];
int sentBytes=0;
// read file and write it into form...
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
while (bytesRead > 0) {
dos.write(buffer, 0, bufferSize);
sentBytes += bufferSize;
dialog.setProgress((int)(sentBytes * 100/bytesAvailable));
bytesAvailable = fileInputStream.available();
bufferSize = Math.min(bytesAvailable, maxBufferSize);
bytesRead = fileInputStream.read(buffer, 0, bufferSize);
}
// send multipart form data necesssary after file data...
dos.writeBytes(lineEnd);
dos.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);
// Responses from the server (code and message)
serverResponseCode = conn.getResponseCode();
String serverResponseMessage = conn.getResponseMessage();
Log.i("uploadFile", "HTTP Response is : " + serverResponseMessage + ": " + serverResponseCode);
if(serverResponseCode == 200){
runOnUiThread(new Runnable() {
public void run() {
String msg = "File Upload Completed.\n\n See uploaded file here : \n\n"
+" F:/wamp/wamp/www/uploads";
messageText.setText(msg);
Toast.makeText(getBaseContext(), "File Upload Complete.", Toast.LENGTH_SHORT).show();
}
});
}
//close the streams //
fileInputStream.close();
dos.flush();
dos.close();
} catch (MalformedURLException ex) {
dialog.dismiss();
ex.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("MalformedURLException Exception : check script url.");
Toast.makeText(getBaseContext(), "MalformedURLException", Toast.LENGTH_SHORT).show();
}
});
Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
} catch (Exception e) {
dialog.dismiss();
e.printStackTrace();
runOnUiThread(new Runnable() {
public void run() {
messageText.setText("Got Exception : see logcat ");
Toast.makeText(getBaseContext(), "Got Exception : see logcat ", Toast.LENGTH_SHORT).show();
}
});
// Log.e("Upload file to server Exception", "Exception : " + e.getMessage(), e);
}
dialog.dismiss();
return serverResponseCode;
} // End else block
}
}
答案 0 :(得分：0)
可能这是因为conn.getOutputStream()返回的流是内部缓冲的。因此，当您发送小文件时，对话框不会显示写入网络的进度，而是显示内部缓冲区的进度。确保您可以添加
dos.flush();
。它应该阻塞，直到数据写入网络。当然，这样的黑客攻击会降低整体上传性能。至少有两种选择：
flush()，例如在写完一些理智的数据（例如几KB）之后说。答案 1 :(得分：0)
您正在致电
onActivityResult()来自后台线程。要更新UI，您必须从UI线程调用此方法。