コンテンツのダウンロード 　

    import android.os.Bundle;
    import android.app.Activity;
    import android.view.Menu;

    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 class MainActivity extends Activity implements AdapterView.OnItemClickListener {

        ListView listView;
        ImageView imageView;
        TextView currentDirText;
        TextView numFilesText;
        Button backButton;
        String rootDir = "DCIM";
        String directoryName = rootDir; // Initialize to rootDirectory
        ArrayAdapter<String> listAdapter;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            // Set buttons
            getWindow().setTitleColor(Color.rgb(65, 183, 216));
            backButton = (Button)findViewById(R.id.button1);
            backButton.getBackground().setColorFilter(Color.rgb(65, 183, 216), PorterDuff.Mode.SRC_IN);
            backButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(directoryName.equals(rootDir)) {
                        listRootDirectory();
                    }
                    else {
                        int index = directoryName.lastIndexOf("/");
                        directoryName = directoryName.substring(0, index);
                        listDirectory(directoryName);
                    }
                }
            });     
            backButton.setEnabled(false); // Disable in root directory
            listRootDirectory();
        }

        @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 listRootDirectory() {
            directoryName = rootDir;
            listDirectory(directoryName);
        }

        public void listDirectory(String dir)
        { // Prepare command directory path
            if(dir.equals(rootDir)) {
                backButton.setEnabled(false);
            }
            else {
                backButton.setEnabled(true);
            }

            currentDirText = (TextView)findViewById(R.id.textView1);
            currentDirText.setText(dir + "/");
            // Fetch number of items in directory and display in a TextView
            dir = "/" + dir;
            ArrayList <NameValuePair> httpParams = new  ArrayList <NameValuePair> ();
            httpParams.add(new BasicNameValuePair("DIR", dir));
            dir = URLEncodedUtils.format (httpParams, "UTF-8" );
            numFilesText = (TextView)findViewById(R.id.textView2);
            // Fetch number of items in directory and display in a TextView
            new AsyncTask<String, Void, String>(){
                @Override
                protected String doInBackground(String... params) {
                    String dir = params[0];
                    String fileCount =  FlashAirRequest.getString("http://flashair/command.cgi?op=101&" + dir);
                    return fileCount;
                }
                @Override
                protected void onPostExecute(String fileCount) {
                    numFilesText.setText("Items Found: " + fileCount);                
                }
            }.execute(dir);

            // Fetch list of items in directory and display in a ListView
            new AsyncTask<String, Void, ListAdapter>(){
                @Override
                protected ListAdapter doInBackground(String... params) {
                    String dir = params[0];
                    ArrayList <String> fileNames = new ArrayList <String>();                
                    String files = FlashAirRequest.getString("http://flashair/command.cgi?op=100&" + dir);
                    String[] allFiles = files.split("([,\n])"); // split by newline or comma
                    for(int i = 2; i < allFiles.length; i= i + 6) {
                        if(allFiles[i].contains(".")) {
                            // File
                            fileNames.add(allFiles[i]);
                        }
                        else { // Directory, append "/"
                            fileNames.add(allFiles[i] + "/");
                        }
                    }

                    listAdapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, fileNames);

                    return listAdapter;
                }
                @Override
                protected void onPostExecute(ListAdapter listAdapter) {
                    // Set the file list to a widget
                    listView = (ListView)findViewById(R.id.listView1);
                    ColorDrawable divcolor = new ColorDrawable(Color.rgb(17, 19, 58));
                    listView.setDivider(divcolor);
                    listView.setDividerHeight(1);
                    listView.setAdapter(listAdapter);
                    listView.setOnItemClickListener(MainActivity.this);
                }
            }.execute(dir);

        @Override
        public void onItemClick(AdapterView<?> l, View v, int position, long id) {
            Object downloadFile = l.getItemAtPosition(position); // get item at clicked position in list of files
            if(downloadFile.toString().endsWith("/")) { // Directory, remove "/" and show content list
                String dirName = downloadFile.toString().substring(0, downloadFile.toString().length()-1); // all but the "/"
                directoryName = directoryName + "/" + dirName;
                listDirectory(directoryName);
            }
            else if( downloadFile.toString().toLowerCase(Locale.getDefault()).endsWith(".jpg") || downloadFile.toString().toLowerCase(Locale.getDefault()).endsWith(".jpeg")
                || downloadFile.toString().toLowerCase(Locale.getDefault()).endsWith(".jpe") || downloadFile.toString().toLowerCase(Locale.getDefault()).endsWith(".png") )
            { // Image file, download using ImageViewActivity
                Intent viewImageIntent = new Intent(this, ImageViewActivity.class);
                viewImageIntent.putExtra("downloadFile", downloadFile.toString());
                viewImageIntent.putExtra("directoryName", directoryName);
                MainActivity.this.startActivity(viewImageIntent); 
            }
        }
    } // End MainActivity class

    public class ImageViewActivity extends Activity {
        ImageView imageView;
        Button backButton;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_image_view);
            getIntent();
            imageView = (ImageView)findViewById(R.id.imageView1);
            backButton = (Button)findViewById(R.id.button2);
            getWindow().setTitleColor(Color.rgb(65, 183, 216));
            backButton.getBackground().setColorFilter(Color.rgb(65, 183, 216), PorterDuff.Mode.SRC_IN);
            Bundle extrasData = getIntent().getExtras();
            String fileName = extrasData.getString("downloadFile");
            String directory = extrasData.getString("directoryName");
            downloadFile(fileName, directory);
        }


        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.image_view, menu);
            return true;
        }

        static public Bitmap getBitmap(String command) {            
            Bitmap resultBitmap = null;
            try{
                URL url = new URL(command);
                URLConnection urlCon = url.openConnection();
                urlCon.connect();
                InputStream inputStream = urlCon.getInputStream();
                ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
                byte[] byteChunk = new byte[1024];
                int bytesRead = 0;
                while( (bytesRead = inputStream.read(byteChunk)) != -1) {
                    byteArrayOutputStream.write(byteChunk, 0, bytesRead);
                }
                byte[] byteArray = byteArrayOutputStream.toByteArray();
                BitmapFactory.Options bfOptions = new BitmapFactory.Options();
                bfOptions.inPurgeable = true;
                resultBitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length, bfOptions);
                byteArrayOutputStream.close();
                inputStream.close();
            }catch(MalformedURLException e) {
                Log.e("ERROR", "ERROR: " + e.toString());
                e.printStackTrace();
            }
            catch(IOException e) {
                Log.e("ERROR", "ERROR: " + e.toString());
                e.printStackTrace();
            }
            return resultBitmap;                        
        }

        void downloadFile(String downloadFile, String directory) {
            final ProgressDialog waitDialog;        
            // Setting ProgressDialog
            waitDialog = new ProgressDialog(this);
            waitDialog.setMessage("Now downloading...");
            waitDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
            waitDialog.show();                
            // Download file
            new AsyncTask<String, Void, Bitmap>(){
                @Override
                protected Bitmap doInBackground(String... params) {
                    String fileName = params[0];
                    return FlashAirRequest.getBitmap(fileName);
                }
                @Override
                protected void onPostExecute(Bitmap resultBitmap) {
                    waitDialog.dismiss();                                
                    viewImage(resultBitmap);
                }
            }.execute("http://flashair/" + directory + "/" + downloadFile.toString());    
        }

lined:

        void viewImage(Bitmap imageBitmap) {
            // Show image in ImageView
            backButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    ImageViewActivity.this.finish();
                }
            });     
            if (imageBitmap == null) {
                imageView.setImageResource(R.drawable.ic_launcher);
            }
            else {
                imageView.setImageBitmap(imageBitmap);
            }
        }
    } // End ImageViewActivity class