Complete code display image from specific folder in SD Card in grid view

This is the My XML..
<?xml version="1.0" encoding="utf-8"?>
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/myGrid"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp"
    android:verticalSpacing="10dp"
    android:background="@drawable/shape"
    android:horizontalSpacing="100dp"
    android:numColumns="auto_fit"
    android:columnWidth="50dp"
    android:stretchMode="columnWidth"
    android:gravity="center"
  
    />

Source code



import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.content.Intent;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

import com.nexbits.digitechi.HeaderAndButtonActivity;
import com.nexbits.digitechi.R;

public class ViewImageAdapter extends HeaderAndButtonActivity {
    List<String> tFileList;
    public Bitmap bm;
    ByteArrayOutputStream baos;
    ImageView jpgView;
    File f;
    File[] files;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.img_gallery);

        GridView g = (GridView) findViewById(R.id.myGrid);
        //g.setAdapter(new ImageAdapter(this, ReadSDCard()));
       
        registerForContextMenu(g);
       
       

        g.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v,
                    int position, long id) {
               
   
               
               
                Toast.makeText(ViewImageAdapter.this, "" + position,
                        Toast.LENGTH_SHORT).show();
                System.out.println("Inside Onclick...............+position");

                //setContentView(R.layout.full_image);
                //ImageView imageView = (ImageView) findViewById(R.id.full_image_view);

    System.out.println("inside the full image?????????????????????????????????");


                 Intent i = new Intent(ViewImageAdapter.this, imageViewFlipper.class);
                // passing array index
                // i.putExtra("id", position);
                 // startActivity(i);
                System.out
                        .println("Inside the intent////////////////////////////////////");
                bm = BitmapFactory.decodeFile(files[position].getPath());
                //imageView.setImageBitmap(bm);
                System.out
                        .println("Inside ihe image view///////////////////????????????????????????");
            }
        });
        registerForContextMenu(g);
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
       
        if (v.getId() == R.id.myGrid) {
            System.out.println("Inside the id.list//////////////////////////");
            AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
             //menu.setHeaderTitle(mThumbIds[info.position]);
            String[] menuItems = getResources().getStringArray(R.array.menu);
            for (int i = 0; i < menuItems.length; i++) {
                menu.add(Menu.NONE, i, i, menuItems[i]);

            }
        }
       

        // menu.add(R.string.gallery_2_text);
    }


    private List<String> ReadSDCard() {
        tFileList = new ArrayList<String>();

        // It have to be matched with the directory in SDCard
        f = new File("/data/digitechimages");// Here you take your specific folder//

        files = f.listFiles(new FilenameFilter() {
            @Override
            public boolean accept(File dir, String name) {
                return ((name.endsWith(".jpg")) || (name.endsWith(".png")));
            }
        });

        for (int i = 0; i < files.length; i++) {
            File file = files[i];
            /*
             * It's assumed that all file in the path are in supported type
             */
            tFileList.add(file.getPath());
        }
        return tFileList;
    }

    public class ImageAdapter extends BaseAdapter {
        int mGalleryItemBackground;
        private Context mContext;
        private List<String> FileList;

        public ImageAdapter(Context c, List<String> fList) {
            mContext = c;
            FileList = fList;
            TypedArray a = obtainStyledAttributes(R.styleable.Gallery1);
            mGalleryItemBackground = a.getResourceId(
                    R.styleable.Gallery1_android_galleryItemBackground, 0);
            a.recycle();
        }

        public int getCount() {
            return FileList.size();
        }

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

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

        public View getView(int position, View convertView, ViewGroup parent) {
            ImageView imageView;
            if (convertView == null) {
                imageView = new ImageView(mContext);
                Bitmap bm = BitmapFactory.decodeFile(FileList.get(position)
                        .toString());
                imageView.setImageBitmap(bm);
                // imageView.setImageResource(FileList[position]);
                imageView.setLayoutParams(new GridView.LayoutParams(175, 175));
                imageView.setAdjustViewBounds(true);
                imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
                imageView.setPadding(8, 8, 5, 8);
                imageView.setBackgroundResource(mGalleryItemBackground);

            } else {
                imageView = (ImageView) convertView;
            }

            // imageView.setImageResource(fi[position]);

            return imageView;
        }

    }

}