علت کرش کردن fileoutputstream

با عرض سلام به تمامی دوستانم 

من در فصل پروژه مارکت هستم قسمت 4 روم قرار دادن تصویر روی logo موقعی پروژه اجرا میکنم  باید از سرور خوانده شد و درون SDCART ذخیره شود ولی در ادامه پروژه از  fileoutputstream  کرش میکند کسی میدونه دلیلش چی هست ؟ کلافه شدم دیگه

اینم کدهای دانلودم 

 package project;

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 DownloadRequest {

 private int downloadedSize;
 private int totalSize;
 private int percent;


 public int getDownloadedSize() {
 return downloadedSize;
 }


 public int getTotalSize() {
 return totalSize;
 }


 public int getPercent() {
 return percent;
 }


 public DownloadRequest download() {
 Thread thread = new Thread(new Runnable() {

 @Override
 public void run() {
 try {
 URL url = new URL(downloadPath);
 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 connection.setRequestMethod("GET");
 connection.setDoOutput(true);
 connection.connect();

 totalSize = connection.getContentLength();

 File file = new File(filepath);
 if (file.exists()) {
 file.delete();
 }

 FileOutputStream outputStream = new FileOutputStream(filepath);

 InputStream inputStream = connection.getInputStream();
 byte[] buffer = new byte[G.DOWNLOAD_BUFFER_SIZE];
 int len = 0;
 while ((len = inputStream.read(buffer)) > 0) {
 outputStream.write(buffer, 0, len);
 downloadedSize += len;

 percent = (int) (100.0f * (float) downloadedSize / totalSize);
 if (percent == 100 && listener != null) {

 G.HANDLER.post(new Runnable() {

 @Override
 public void run() {
 listener.onDownloadComplete(downloadPath, filepath);
 }
 });
 }

 if (simulate) {
 try {
 Thread.sleep(100);
 }
 catch (InterruptedException e) {
 e.printStackTrace();
 }
 }
 }

 outputStream.close();
 }
 catch (MalformedURLException e) {
 e.printStackTrace();
 }
 catch (IOException e) {
 e.printStackTrace();
 }
 }
 });

 thread.start();

 return this;
 }

 private String downloadPath;
 private String filepath;
 private OnDownloadCompleteListener listener;
 private boolean simulate;


 public DownloadRequest downloadPath(String value) {
 downloadPath = value;
 return this;
 }


 public DownloadRequest filepath(String value) {
 filepath = value;
 return this;
 }


 public DownloadRequest listener(OnDownloadCompleteListener value) {
 listener = value;
 return this;
 }


 public DownloadRequest simulate(boolean value) {
 simulate = value;
 return this;
 }
}package project;

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 DownloadRequest {

 private int downloadedSize;
 private int totalSize;
 private int percent;


 public int getDownloadedSize() {
 return downloadedSize;
 }


 public int getTotalSize() {
 return totalSize;
 }


 public int getPercent() {
 return percent;
 }


 public DownloadRequest download() {
 Thread thread = new Thread(new Runnable() {

 @Override
 public void run() {
 try {
 URL url = new URL(downloadPath);
 HttpURLConnection connection = (HttpURLConnection) url.openConnection();
 connection.setRequestMethod("GET");
 connection.setDoOutput(true);
 connection.connect();

 totalSize = connection.getContentLength();

 File file = new File(filepath);
 if (file.exists()) {
 file.delete();
 }

 FileOutputStream outputStream = new FileOutputStream(filepath);

 InputStream inputStream = connection.getInputStream();
 byte[] buffer = new byte[G.DOWNLOAD_BUFFER_SIZE];
 int len = 0;
 while ((len = inputStream.read(buffer)) > 0) {
 outputStream.write(buffer, 0, len);
 downloadedSize += len;

 percent = (int) (100.0f * (float) downloadedSize / totalSize);
 if (percent == 100 && listener != null) {

 G.HANDLER.post(new Runnable() {

 @Override
 public void run() {
 listener.onDownloadComplete(downloadPath, filepath);
 }
 });
 }

 if (simulate) {
 try {
 Thread.sleep(100);
 }
 catch (InterruptedException e) {
 e.printStackTrace();
 }
 }
 }

 outputStream.close();
 }
 catch (MalformedURLException e) {
 e.printStackTrace();
 }
 catch (IOException e) {
 e.printStackTrace();
 }
 }
 });

 thread.start();

 return this;
 }

 private String downloadPath;
 private String filepath;
 private OnDownloadCompleteListener listener;
 private boolean simulate;


 public DownloadRequest downloadPath(String value) {
 downloadPath = value;
 return this;
 }


 public DownloadRequest filepath(String value) {
 filepath = value;
 return this;
 }


 public DownloadRequest listener(OnDownloadCompleteListener value) {
 listener = value;
 return this;
 }


 public DownloadRequest simulate(boolean value) {
 simulate = value;
 return this;
 }
}