How to Dynamically show images from a folder in sdcard

Question

I have to create a gridview that is loaded with images from a specific folder that resides on an SDCard. The path to the folder is "/sdcard/images/". i tried with this code,the app is taking too much time to load and it is displaying only one image.

    public class ImAdapterh extends BaseAdapter{

       File dir=new File(Environment.getExternalStorageDirectory(),"/myImages/");

int count=dir.list().length; 

String[] fileNames = dir.list();

 private Context mContext;

    public ImAdapterh(Context c) {
        mContext = c;
    }

    public int getCount() {
        return count;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView = null;        


      for(String bitmapFileName : fileNames)
      {
           if (convertView == null) 
           {  // if it's not recycled, initialize some attributes
               imageView = new ImageView(mContext);
               imageView.setLayoutParams(new GridView.LayoutParams(85, 85));
               imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
               imageView.setPadding(8, 8, 8, 8);                   

               Bitmap bmp = BitmapFactory.decodeFile(dir.getPath() + "/" + bitmapFileName);
               System.out.println(dir);
               imageView.setImageBitmap(bmp);  
            }else 
            {
            imageView = (ImageView) convertView;            

            }
    } 
        return imageView;
        }

the app is taking too much time and it is displaying only one image

this is my activity class

      public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);        
       GridView gridview = (GridView) findViewById(R.id.gridview);
       gridview.setAdapter(new ImAdapterh(this));}

Answer 1

To get images from any specific directory. Use the following code

public void searchImageFromSpecificDirectory() {

        String path = null;

        String uri = MediaStore.Images.Media.DATA;
        // if GetImageFromThisDirectory is the name of the directory from which image will be retrieved
        String condition = uri + " like '%/GetImageFromThisDirectory/%'";
        String[] projection = { uri, MediaStore.Images.Media.DATE_ADDED,
                MediaStore.Images.Media.SIZE };
        Vector additionalFiles = null;
        try {
            if (additionalFiles == null) {
                additionalFiles = new Vector<String>();
            }



            Cursor cursor = managedQuery(
                    MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection,
                    condition, null, null);
            if (cursor != null) {

                boolean isDataPresent = cursor.moveToFirst();

                if (isDataPresent) {

                    do {

                        path = cursor.getString(cursor.getColumnIndex(uri));
System.out.println("...path..."+path);
additionalFiles.add(path);
            }while(cursor.moveToNext());
                }
            if (cursor != null) {
                cursor.close();
            }
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

Answer 2

The path to the folder is "/sdcard/images/".

No, it is not, at least not for most devices. Never hard-code paths in Android. Always use Environment.getExternalStorageDirectory() to get the root of external storage.

i tried with this code,the app is taking too much time to load and it is displaying only one image.

Of course. There is very little correct in what you have done here.

The biggest problem is that your getView() loads every image into the same ImageView, for each and every row returned by your Adapter. Presumably, you should be only loading one image into the ImageView for a given row.

Your next-biggest problem is that you are doing disk I/O on the main application thread.