MainActivit_start

public class Main1 extends Activity{
	private Button mGellery,mCamera;
	private static final int RESULT_LOAD_IMAGE = 1;
	public static Bitmap mBitMap;
	String TAG = "Main1";
	int IMAGE_MAX_SIZE = 320;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.m);

		mGellery=(Button)findViewById(R.id.button1);
		mGellery.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Intent i = new Intent(
						Intent.ACTION_PICK,
						android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);

				startActivityForResult(i, RESULT_LOAD_IMAGE);


			}
		});
		mCamera=(Button)findViewById(R.id.button2);
		mCamera.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				// TODO Auto-generated method stub
				Intent i = new Intent(Main1.this,PhotoMargingActivity.class);
				i.putExtra("image", false);
				startActivity(i);
			}
		});
	}





	@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RESULT_LOAD_IMAGE && resultCode == RESULT_OK && null != data) {
            Uri selectedImage = data.getData();
            String[] filePathColumn = { MediaStore.Images.Media.DATA };

            Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String picturePath = cursor.getString(columnIndex);
            cursor.close();

//............... to get the decode file .........................................

            mBitMap = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(picturePath),250, 250, true);
//            mBitMap = Bitmap.createScaledBitmap(BitmapFactory.decodeFile(picturePath),250, 250, true);

//            mPicture = new ImageView(context);
//            mPicture.setImageBitmap(bm);
//            mBitMap=BitmapFactory.decodeFile(picturePath);
          //  mImage.setImageBitmap();
            Intent i = new Intent(Main1.this,PhotoMargingActivity.class);
            i.putExtra("image", true);
            startActivity(i);
        }

    }
//	private Bitmap decodeFile(File f){
//	    try {
//	        //Decode image size
//	        BitmapFactory.Options o = new BitmapFactory.Options();
//	        o.inJustDecodeBounds = true;
//	        BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//
//	        //The new size we want to scale to
//	        final int REQUIRED_SIZE=70;
//
//	        //Find the correct scale value. It should be the power of 2.
//	        int scale=1;
//	        while(o.outWidth/scale/2>=REQUIRED_SIZE && o.outHeight/scale/2>=REQUIRED_SIZE)
//	            scale*=2;
//
//	        //Decode with inSampleSize
//	        BitmapFactory.Options o2 = new BitmapFactory.Options();
//	        o2.inSampleSize=scale;
//	        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
//	    } catch (FileNotFoundException e) {}
//	    return null;
//	}
	private Bitmap decodeFile(File f){
	    Bitmap b = null;
	    try {
	        //Decode image size
	        BitmapFactory.Options o = new BitmapFactory.Options();
	        o.inJustDecodeBounds = true;
	        o.inSampleSize = 8;

	        FileInputStream fis = new FileInputStream(f);
	        BitmapFactory.decodeStream(fis, null, o);
	        fis.close();

	        int scale = 1;
	        if (o.outHeight > IMAGE_MAX_SIZE || o.outWidth > IMAGE_MAX_SIZE) {
	            scale = (int)Math.pow(2, (int) Math.round(Math.log(IMAGE_MAX_SIZE / (double) Math.max(o.outHeight, o.outWidth)) / Math.log(0.5)));
	        }

	        //Decode with inSampleSize
	        BitmapFactory.Options o2 = new BitmapFactory.Options();
	        o2.inSampleSize = scale;
	        fis = new FileInputStream(f);
	        b = BitmapFactory.decodeStream(fis, null, o2);
	        fis.close();
	    } catch (IOException e) {
	    }
	    return b;
	}
}
here is another