Below is the code that will show the full size image in a dialog box popup without defining layout xml file .

In the code below I have taken two imageview named profile_pic and pro, to get the OnTouchListener action of particular image I have used the code

int a=v.getId(); intiger "a" will have the value equal to profile_pic if we touched on profile_pic imageview else we will get pro id .

Since I have copy pasted the images within my app drawable folder  so I am using the path as

"uri = Uri.parse("android.resource://"+getPackageName()+"/drawable/pro");" If you are using the images on external storage then you have to give the path as   

"uri = Uri.parse(path of your image);"

private ImageView profile_pic,pro;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home_page);

     profile_pic=(ImageView)findViewById(R.id.img_View);
        pro=(ImageView)findViewById(R.id.go_pro);
        pro.setOnTouchListener(mTouchListener);
        profile_pic.setOnTouchListener(mTouchListener);    

    }

       private View.OnTouchListener mTouchListener=new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Dialog builder = new Dialog(HomePage.this);
            builder.requestWindowFeature(Window.FEATURE_NO_TITLE);
            builder.getWindow().setBackgroundDrawable(
                    new ColorDrawable(android.graphics.Color.TRANSPARENT));
            builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
                @Override
                public void onDismiss(DialogInterface dialogInterface) {
                    //nothing;
                }
            });
            int a=v.getId();
            if(R.id.go_pro==a)
            {
        uri = Uri.parse("android.resource://"+getPackageName()+"/drawable/pro");    //path of image
            }
            else if(R.id.img_View==a) {
      uri = Uri.parse("android.resource://" + getPackageName() + "/drawable/profile"); //path of image
            }
            ImageView imageView = new ImageView(HomePage.this);
            imageView.setImageURI(uri);                //set the image in dialog popup

            //below code fullfil the requirement of xml layout file for dialoge popup
       

     builder.addContentView(imageView, new RelativeLayout.LayoutParams(
                    ViewGroup.LayoutParams.WRAP_CONTENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT));
            builder.show();

            return false;
        }
    };