android - Loop to upload list images one by one

Question

I want to upload multiple images one by one, like once user do tap on upload all button, it has to start with first image visible in a list, once first image will be uploaded to server then automatically has to start second for upload but after one or two second interval and same for all available images in a list.

This is my code, which allow me to upload single image:-

Code to upload single image

    // btnUpload
    holder.uploadImageButton.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        // Upload
        startUpload(position);
            }
        });

I am using below code, but its uploading/syncing all images at same time, my mean together, like i have 500 images in a list so its uploading all 500 together and as a result i am getting error when internet connection goes down and many times not getting accurate status of uploaded images !

    private SparseBooleanArray flags = new SparseBooleanArray();

    // At onClick, set all the flags to indicate that some data needs to be synced
    ImageButton buttonUploadAll = (ImageButton) findViewById(R.id.sync_btn);
    buttonUploadAll.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {

             for(int position=0; position<listView.getAdapter().getCount(); position++)
             {
                 flags.put(position, true);
             }

             // Calling this would ensure a call to getView() on every
             // visible child of the listview. That is where we will check if
             // the data is to be synced and displayed or not
             ((BaseAdapter) listView.getAdapter()).notifyDataSetChanged();
             }
          });

      @Override
      // In getView of the listview's adapter
      public View getView(int position, View convertView, ViewGroup parent) {

      // If this item is to be synced
      if(flags.get(position)) {
        startUpload();

        // Mark as synced
        flags.put(position, false);
    }

    // Rest of the method that draws the view....
}

that's why i want to upload multiple images one by one (in a queue manner)

Answer 1

I have tried to write a service which will upload image from shared pref one by one : Note : i hv hardcoded some of things here like image are from sdcard so path is hardcoded, images names are hardcoded, so plz change it appropriately and try out below code , i hv tested and worked for me

Below code contains Service, Activity[upload button, listview], xmlLayout, php service which will upload image on ftp.

Activity :

 public class MainActivity extends Activity {

        SharedPreferences sharedPref;
        SharedPreferences.Editor editor;
        ListView listview;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            sharedPref = getSharedPreferences("myfiles", MODE_PRIVATE);
            editor = sharedPref.edit();
            editor.putString("0", "monika_pin.png");
            editor.putString("1", "monika_pin1.png");
            editor.putString("2", "monika_pin2.png");
            editor.commit();

            String[] arr = new String[] { "/mnt/sdcard/monika_pin.png",
                    "/mnt/sdcard/monika_pin1.png", "/mnt/sdcard/monika_pin2.png" };

            List<String> list = Arrays.asList(arr);

            MyAdapter adapter = new MyAdapter(this, R.layout.listitem_imv, list);
            listview = (ListView) findViewById(R.id.listView1);
            listview.setAdapter(adapter);

        }

        class MyAdapter extends ArrayAdapter<String> {

            List<String> mList;
            LayoutInflater mInflater;
            int mResource;

            public MyAdapter(Context context, int resource, List<String> objects) {
                super(context, resource, objects);

                mResource = resource;
                mInflater = getLayoutInflater();
                mList = objects;
            }

            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                View view;

                if (convertView == null) {
                    view = mInflater.inflate(mResource, null);
                } else {
                    view = convertView;
                }

                ImageView imageView = (ImageView) view
                        .findViewById(R.id.imageView1);
                TextView textView = (TextView) view.findViewById(R.id.textView1);

                imageView.setTag(mList.get(position));// tag of imageView == path to
                                                        // image
                new LoadImage(imageView).execute();
                textView.setText(mList.get(position).toString());

                return view;
            }
        }

        class LoadImage extends AsyncTask<Object, Void, Bitmap> {

            private ImageView imv;
            private String path;

            public LoadImage(ImageView imv) {
                this.imv = imv;
                this.path = imv.getTag().toString();
            }

            @Override
            protected Bitmap doInBackground(Object... params) {
                Bitmap bitmap = null;
                // File file = new File(
                // Environment.getExternalStorageDirectory().getAbsolutePath() +
                // path);
                File file = new File(path);
                if (file.exists()) {
                    bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());
                }

                return bitmap;
            }

            @Override
            protected void onPostExecute(Bitmap result) {
                if (!imv.getTag().toString().equals(path)) {
                    /*
                     * The path is not same. This means that this image view is
                     * handled by some other async task. We don't do anything and
                     * return.
                     */
                    return;
                }

                if (result != null && imv != null) {
                    imv.setVisibility(View.VISIBLE);
                    imv.setImageBitmap(result);
                } else {
                    imv.setVisibility(View.GONE);
                }
            }

        }

        public void buttonClick(View view) {
            Intent intent = new Intent(this, MyService.class);
            startService(intent);
        }
    }

Service :

public class MyService extends Service {
    SharedPreferences sharedPref;
    SharedPreferences.Editor editor;
    int serverResponseCode = 0;
    String upLoadServerUri = null;

    private static final String TAG = "com.example.ServiceExample";

    @Override
    public void onCreate() {
        Log.i(TAG, "Service onCreate");
        sharedPref = getSharedPreferences("myfiles", MODE_PRIVATE);
        /************* Php script path ****************/
        upLoadServerUri = "http://myserver/uploadimage.php";

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        Log.i(TAG, "Service onStartCommand " + startId);

        final int currentId = startId;

        Runnable r = new Runnable() {
            public void run() {

                for (int i = 0; i < 3; i++) {
                    // long endTime = System.currentTimeMillis() + 10*1000;

                    // while (System.currentTimeMillis() < endTime) {
                    synchronized (this) {
                        try {

                            uploadFile(sharedPref.getString(i + "", ""));

                        } catch (Exception e) {
                        }

                    }
                    // }
                    Log.i(TAG, "Service running " + currentId);
                }
                stopSelf();
            }
        };

        Thread t = new Thread(r);
        t.start();
        return Service.START_STICKY;
    }

    @Override
    public IBinder onBind(Intent arg0) {
        // TODO Auto-generated method stub
        Log.i(TAG, "Service onBind");
        return null;
    }

    @Override
    public void onDestroy() {
        Log.i(TAG, "Service onDestroy");
    }

    public int uploadFile(String sourceFileUri) {

        String fileName = sourceFileUri;

        HttpURLConnection conn = null;
        DataOutputStream dos = null;
        String lineEnd = "
";
        String twoHyphens = "--";
        String boundary = "*****";
        int bytesRead, bytesAvailable, bufferSize;
        byte[] buffer;
        int maxBufferSize = 1 * 1024 * 1024;
        // File sourceFile = new
        // File(Environment.getExternalStorageDirectory(),sourceFileUri);
        File sourceFile = new File(Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "/" + fileName);
        if (!sourceFile.isFile()) {

            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("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];

                // read file and write it into form...
                bytesRead = fileInputStream.read(buffer, 0, bufferSize);

                while (bytesRead > 0) {

                    dos.write(buffer, 0, bufferSize);
                    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) {

                }

                // close the streams //
                fileInputStream.close();
                dos.flush();
                dos.close();

            } catch (MalformedURLException ex) {

                ex.printStackTrace();

                Log.e("Upload file to server", "error: " + ex.getMessage(), ex);
            } catch (Exception e) {

                e.printStackTrace();

                Log.e("Upload file to server Exception",
                        "Exception : " + e.getMessage(), e);
            }

            return serverResponseCode;

        } // End else block
    }

}

XmlLayout :

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.service.MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:onClick="buttonClick"
        android:text="Button" />

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button1"
        android:layout_centerHorizontal="true" >
    </ListView>

</RelativeLayout>

AndroidManifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"