Develop Reference

HttpURLConnection problem in Android Studio while loading an image from internet

I'm trying to download the image from URL: "http://upload.wikimedia.org/wikipedia/en/a/aa/Bart_Simpson_200px.png
and after that I want to display it in image view. but continuously the error in HttpURLConnection is occurring
On clicking of a button(download function is called) it should remove the previous image and load the new image from the url
I have tried using internet on emulator and its working fine. emulator and my pc is connected to internet. I have also asked permissions in AndroidMenifest. but nothing is solving the problem.
package com.example.web;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.concurrent.ExecutionException;
public class MainActivity extends AppCompatActivity {
ImageView imageView;
public class ImageDownloader extends AsyncTask<String,Void, Bitmap> {
#Override
protected Bitmap doInBackground(String... strings) {
try {
URL url = new URL(strings[0]);
HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.connect();
InputStream inputStream = httpURLConnection.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
return bitmap;
} catch (IOException e) {
e.printStackTrace();
Log.i("Error","Error encountered");
}
return null;
}
}
public void download(View view) {
imageView = findViewById(R.id.imageView3);
imageView.setImageResource(0);
ImageDownloader imageDownloader = new ImageDownloader();
try {
Bitmap bitmap = imageDownloader.execute("http://upload.wikimedia.org/wikipedia/en/a/aa/Bart_Simpson_200px.png").get();
imageView.setImageBitmap(bitmap);
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
Permissions in AndroidMenifiest
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

As Per Your Code I write Down New One just Replace it With Existing One
public class MainActivity extends AppCompatActivity {
ImageView imageView;
public class ImageDownloader extends AsyncTask<String,Void, Bitmap> {
OutputStream output;
#Override
protected Bitmap doInBackground(String... strings) {
int count;
Long tsLong = System.currentTimeMillis() / 1000;
String ts = tsLong.toString();
try {
URL url = new URL(strings[0]);
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
// download the file
InputStream input = new BufferedInputStream(url.openStream(),
8192);
// Output stream
output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+ "DownloadedFile" + ts + ".jpg");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
int cur = (int) ((total * 100) / lenghtOfFile);
if (Math.min(cur, 100) > 98) {
try {
// Sleep for 5 seconds
Thread.sleep(500);
} catch (InterruptedException e) {
Log.d("Failure", "sleeping failure");
}
}
Log.i("currentProgress", "currentProgress: " + Math.min(cur, 100) + "\n " + cur);
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
public void download(View view) {
imageView = findViewById(R.id.imageView3);
imageView.setImageResource(0);
ImageDownloader imageDownloader = new ImageDownloader();
try {
Bitmap bitmap = imageDownloader.execute("http://upload.wikimedia.org/wikipedia/en/a/aa/Bart_Simpson_200px.png").get();
imageView.setImageBitmap(bitmap);
} catch (ExecutionException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

If you want to download Image and store in Your Local Storage then Use Below Code.
Here I create One DownloadFileFromURL.class File which is my AsyncTask So downloading processed Without Interruption.
public DownloadFileFromURL(Context context) {
this.context = context;
}
protected void onPreExecute() {
super.onPreExecute();
Log.e(TAG, "onPreExecute: Download started");
}
#Override
protected String doInBackground(String... f_url) {
int count;
Long tsLong = System.currentTimeMillis() / 1000;
String ts = tsLong.toString();
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
// download the file
InputStream input = new BufferedInputStream(url.openStream(),
8192);
// Output stream
output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+ "Your Folder Name" + ts + ".jpg");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
int cur = (int) ((total * 100) / lenghtOfFile);
if (Math.min(cur, 100) > 98) {
try {
// Sleep for 5 seconds
Thread.sleep(500);
} catch (InterruptedException e) {
Log.d("Failure", "sleeping failure");
}
}
Log.i("currentProgress", "currentProgress: " + Math.min(cur, 100) + "\n " + cur);
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
return null;
}
Now Call Above File in Your Activity or When You want. At the time of Calling this AsyncTask pass Your URLto download images.
new DownloadFileFromURL(context).execute("Your Download URL");

openning pdf file in android from server gives me this error document is empty

when I click button download, pdf opens but gives me this message document is empty 0ko plz if you any suggessions,I use my phone, and I send the acrobat reader adobe file in my phone and i have adobe acrobat in my phone..
this Mainactivity.java
package com.example.down1;
import java.io.File;
import java.io.IOException;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void download(View v)
{
new DownloadFile().execute("http://172.16.2.138/upload/guide.pdf", "guide.pdf");
}
public void view(View v)
{
File pdfFile = new File(Environment.getExternalStorageDirectory() + "/uploade/" + "guide.pdf"); // -> filename = maven.pdf
Uri path = Uri.fromFile(pdfFile);
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
//Intent intent = Intent.createChooser(pdfIntent, "Open File");
startActivity(pdfIntent);
}
private class DownloadFile extends AsyncTask<String, Void, Void>{
#Override
protected Void doInBackground(String... strings) {
String fileUrl = strings[0]; // -> http://maven.apache.org/maven-1.x/maven.pdf
String fileName = strings[1]; // -> maven.pdf
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
File folder = new File(extStorageDirectory, "uploade");
folder.mkdir();
File pdfFile = new File(folder, fileName);
try{
pdfFile.createNewFile();
}catch (IOException e){
e.printStackTrace();
}
FileDownloader.downloadFile(fileUrl, pdfFile);
return null;
}
}
}
this is my class filedownloader
package com.example.down1;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class FileDownloader {
private static final int MEGABYTE = 1024 * 1024;
public static void downloadFile(String fileUrl, File directory){
try {
URL url = new URL(fileUrl);
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
//urlConnection.setRequestMethod("GET");
//urlConnection.setDoOutput(true);
urlConnection.connect();
InputStream inputStream = urlConnection.getInputStream();
FileOutputStream fileOutputStream = new FileOutputStream(directory);
int totalSize = urlConnection.getContentLength();
byte[] buffer = new byte[MEGABYTE];
int bufferLength = 0;
while((bufferLength = inputStream.read(buffer))>0 ){
fileOutputStream.write(buffer, 0, bufferLength);
}
fileOutputStream.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

Android: EACCES (Permission denied) , while I added the uses-permisson in manifest

I'm using a very simple code to download an Image from my localhost : here it is :
package com.pep.www.imagedownloader;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btnDownload = (Button) findViewById(R.id.btnDownload);
btnDownload.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
download();
}
});
thread.start();
}
});
}
public void download(){
int read = -1;
byte[] buffer = new byte[5*1024];
URL url = null;
HttpURLConnection ucon = null;
InputStream inputStream = null;
FileOutputStream fileOutputStream = null;
File file = null;
try {
url = new URL("http://192.168.1.128/image.jpg");
ucon = (HttpURLConnection) url.openConnection();
inputStream = ucon.getInputStream();
file = new File("mnt/sdcard/image.jpg");
fileOutputStream = new FileOutputStream(file);
while((read=inputStream.read(buffer))!=-1){
fileOutputStream.write(buffer,0,read);
Log.i("LOG","Downling : "+read);
}
Log.i("LOG","Downloaded");
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
While I've added this permission in manifest :
<uses-permission android:name="android.permission.INTERNET"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
I still get this error :
java.io.FileNotFoundException: mnt/sdcard/image.jpg: open failed: EACCES (Permission denied)
EDIT :
when I change my file path to this :
file = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath()+"/image.jpg ");
I still get this error :
java.io.FileNotFoundException: /storage/sdcard/Pictures/aylar.jpg : open failed: EACCES (Permission denied)
EDIT :
Instead of being so childish and giving downVotes , solve the problem !
Stackoverflow has become a place to play childish games :(

Firstly let me tell you one thing If you are using an emulator then the code will not work you need a real device.As we know we give permission to store image in external storage So You can use this method to save your image and then get back.
URL url = new URL ("file://some/path/anImage.png");
InputStream input = url.openStream();
try {
//The sdcard directory e.g. '/sdcard' can be used directly, or
//more safely abstracted with getExternalStorageDirectory()
File storagePath = Environment.getExternalStorageDirectory();
OutputStream output = new FileOutputStream (new File(storagePath,"myImage.png"));
try {
byte[] buffer = new byte[aReasonableSize];
int bytesRead = 0;
while ((bytesRead = input.read(buffer, 0, buffer.length)) >= 0) {
output.write(buffer, 0, bytesRead);
}
} finally {
output.close();
}
} finally {
input.close();
}

try to use this
if (android.os.Environment.getExternalStorageState().equals(
android.os.Environment.MEDIA_MOUNTED))
{
file =new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES).getAbsolutePath()+"/image.jpg ");
if(!file.exists())
file.createNewFile();
}

replace
file = new File("mnt/sdcard/image.jpg");
with
file = new File("file:///sdcard/image.jpg");

its simple code any file like image,video,audio etc we can download it.
Button start;
//String HttpMyUrl="http://am.cdnmob.org/_/img/loader-small.gif";
String HttpMyUrl="http://ringtones.mob.org/ringtone/RIusrm-7xATkRQlLw1o89w/1424909358/fa1b23bb5e35c8aed96b1a5aba43df3d/stefano_gambarelli_feat_pochill-land_on_mars_v2.mp3";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
start= (Button) findViewById(R.id.startBtn);
start.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DownloadManager.Request request = new DownloadManager.Request(Uri.parse(HttpMyUrl));
request.setTitle("File Download");
request.setDescription("File is being Downloaded...");
request.allowScanningByMediaScanner();
request.setNotificationVisibility(DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);
String fileName = URLUtil.guessFileName(HttpMyUrl,null, MimeTypeMap.getFileExtensionFromUrl(HttpMyUrl));
request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS,fileName);
DownloadManager manager =(DownloadManager) getApplication().getSystemService(Context.DOWNLOAD_SERVICE);
manager.enqueue(request);
}
});

Android applications can't upload photos to the server

I want to do an App. It can realize to upload the phone picture to server. Now it can take the picture and save to the mobile phone. But it can not upload into server. How to deal with this? The server is using tomcat to setup.
Android upload code:
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class uploadActivity extends Activity
{
private Button uploadbutton;
private String uploadFile = Environment.getExternalStorageDirectory().getAbsolutePath()+"/Test.jpg";
private String srcPath = Environment.getExternalStorageDirectory().getAbsolutePath()+"/Test.jpg";
private String actionUrl = "http://192.168.1.105:8080/ATestInternetCameraServlet/";
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_photo);
uploadbutton=(Button)findViewById(R.id.button2);
uploadbutton.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
uploadFile();
}
});
}
private void uploadFile()
{ String uploadUrl = "http://192.168.1.105:8080/ATestInternetCameraServlet/CameraServlet";
String end = "\r\n";
String twoHyphens = "--";
String boundary = "******";
try
{
URL url = new URL(uploadUrl);
HttpURLConnection httpURLConnection = (HttpURLConnection) url
.openConnection();
httpURLConnection.setDoInput(true);
httpURLConnection.setDoOutput(true);
httpURLConnection.setUseCaches(false);
httpURLConnection.setRequestMethod("POST");
httpURLConnection.setRequestProperty("Connection", "Keep-Alive");
httpURLConnection.setRequestProperty("Charset", "UTF-8");
httpURLConnection.setRequestProperty("Content-Type",
"multipart/form-data;boundary=" + boundary);
DataOutputStream dos = new DataOutputStream(httpURLConnection
.getOutputStream());
dos.writeBytes(twoHyphens + boundary + end);
dos
.writeBytes("Content-Disposition: form-data; name=\"file\"; filename=\""
+ srcPath.substring(srcPath.lastIndexOf("/") + 1)
+ "\"" + end);
dos.writeBytes(end);
FileInputStream fis = new FileInputStream(srcPath);
byte[] buffer = new byte[8192]; // 8k
int count = 0;
while ((count = fis.read(buffer)) != -1)
{
dos.write(buffer, 0, count);
}
fis.close();
dos.writeBytes(end);
dos.writeBytes(twoHyphens + boundary + twoHyphens + end);
dos.flush();
InputStream is = httpURLConnection.getInputStream();
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
String result = br.readLine();
Toast.makeText(this, result, Toast.LENGTH_LONG).show();//
dos.close();
is.close();
} catch (Exception e)
{
e.printStackTrace();
setTitle(e.getMessage());
}
}
}
The server code:
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
public class CameraServlet extends HttpServlet
{
protected void service(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException
{
try
{
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out2 = response.getWriter();
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
List<FileItem> items = upload.parseRequest(request);
String uploadPath = "d:\\cameraupload\\";
File file = new File(uploadPath);
if (!file.exists())
{
file.mkdir();
}
String filename = "";
InputStream is = null;
for (FileItem item : items)
{
if (item.isFormField())
{
if (item.getFieldName().equals("filename"))
{
if (!item.getString().equals(""))
filename = item.getString("UTF-8");
}
}
else if (item.getName() != null && !item.getName().equals(""))
{
filename = item.getName().substring(
item.getName().lastIndexOf("\\") + 1);
is = item.getInputStream(); // 得到上传文件的InputStream对象
}
}
filename = uploadPath + filename;
if (new File(filename).exists())
{
new File(filename).delete();
}
// Began to upload files
if (!filename.equals(""))
{
// use FileOutputStream to open the upload file in server
FileOutputStream fos2 = new FileOutputStream(filename);
byte[] buffer = new byte[8192];
int count = 0;
// Began to read the upload file in bytes，and input it to server's upload file output stream
while ((count = is.read(buffer)) > 0)
{
fos2.write(buffer, 0, count); // To write the byte stream server files
}
fos2.close(); // close FileOutputStream object
is.close(); // InputStream object
out2.println("file upload success!xii");
}
}
catch (Exception e)
{
}
}
}

Do you have any error tracing?? Our just happening nothing??
For using httpurlconnection, you need to change the policy at the beginning:
ThreadPolicy mThreadPolicy = new ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(mThreadPolicy);
Try this.

Isn't 192.168.1.105 an IP-adress on the local network? Are you sure it's reachable from your phone? Open your phone's browser and try to navigate to the URL, can you reach it?
At what end are you having problems with the upload? Client or server? If it's on the client, what error are you getting? Or is it silently failing? Have you tried to make a simple HTML form and do the upload from there? If that is working you know it's your Android code that is the problem?
Also, it hurts every time I see someone trying to implement file uploads on their own. I'm not saying that your code is wrong, but it's an awful lot of lines of code (thus more risk of errors) compared to if you'd use a 3rd party library to abstract away all of that code for you. A well known and popular library such as Android Asynchronous Http Client has good support for file uploads out of the box:
AsyncHttpClient client = new AsyncHttpClient();
String filename = "file.png";
File myFile = new File("/path/to/" + filename);
RequestParams params = new RequestParams();
try {
params.put("file", myFile);
params.put("filename", filename);
client.post("http://192.168.1.105:8080/ATestInternetCameraServlet/CameraServlet", params, responseHandler);
}
catch(FileNotFoundException e) {
// handle
}

Try this...add apache-mime4j-0.6.jar and httpmime-4.0.3.jar libs
File f=new File(exsistingFileName);
HttpClient http = new DefaultHttpClient();
HttpPost post = new HttpPost("http://192.168.1.105:8080/ATestInternetCameraServlet/CameraServlet");
MultipartEntity Mentity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
String url1=exsistingFileName;
String mime;
String extension = MimeTypeMap.getFileExtensionFromUrl(url1);
if (extension != ""&&extension!=null) {
MimeTypeMap mime1 = MimeTypeMap.getSingleton();
mime = mime1.getMimeTypeFromExtension(extension);
}
else
{
String ext = url1.substring((url1.lastIndexOf(".") + 1), url1.length());
MimeTypeMap mime1 = MimeTypeMap.getSingleton();
mime = mime1.getMimeTypeFromExtension(ext);
}
ContentBody cbFile;
if(mime!=null)
cbFile= new FileBody(f,mime);
else
cbFile=new FileBody(f);
Mentity.addPart("file",cbFile);
post.setEntity(Mentity);
HttpResponse response = null;
try {
response = http.execute(post);
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
responseString = new BasicResponseHandler().
handleResponse(response);
} catch (HttpResponseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
HttpEntity entity = response.getEntity();
System.out.println("----------------------------------------");
System.out.println(response.getStatusLine());
if (entity != null) {
System.out.println("Response content length: " + entity.getContentLength());
}

Getting Error while downloading file (from local system) in android

Download.java
package com.example.download_file;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class Download extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_download);
final Button downloadbutton=(Button)findViewById(R.id.download_button);
final EditText text=(EditText)findViewById(R.id.download_filename);
downloadbutton.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
download();
text.setText("success");
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_download, menu);
download();
return true;
}
public void download()
{
final EditText text=(EditText)findViewById(R.id.download_filename);
final EditText localname=(EditText)findViewById(R.id.localname);
try {
String name=text.getText().toString();
String sdcardname=localname.getText().toString();
URL url = new URL(name);
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
urlConnection.connect();
File SDCardRoot = Environment.getExternalStorageDirectory();
File file = new File(SDCardRoot,sdcardname);
FileOutputStream fileOutput = new FileOutputStream(file);
InputStream inputStream = urlConnection.getInputStream();
int totalSize = urlConnection.getContentLength();
int downloadedSize = 0;
.
byte[] buffer = new byte[1024];
int bufferLength = 0;
while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
fileOutput.write(buffer, 0, bufferLength);
}
fileOutput.close();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
1)
input: url= "\192.168.0.103\shared\file.txt"
error: java.net.MalformedURLException:Protocol not found :\192.168.0.103\shared\file.txt
2)
input :url= "file://192.168.0.103/shared/file.txt"
error : java.lang.ClassCastEXception : org.apache.harmony.luni.internal.net.www.protocol.ftp.FtpURLConnection

Use AsyncTask Take a look here: link AsyncTask may be this can help you solve your problem.