how do i add zoom function in my imageview
<p>in my code i dynamically crete imageview programically how do i add zoom in zoom out function in my code? please help  me i want to create zooom function so when user click on image is enlarge and when click again go original size what do i do?</p>

<pre><code>   ScrollView scroll = new ScrollView(MainActivity1.this);
     scroll.setLayoutParams(new  
     LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,  
      LayoutParams.WRAP_CONTENT));       

     btnLO = new LinearLayout(MainActivity1.this);  
     LinearLayout.LayoutParams paramsLO = new  
        LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT,  
        LayoutParams.WRAP_CONTENT);
     // button margins
     paramsLO.setMargins(0, 0, 0, 0);


     LinearLayout.LayoutParams paramsLO2 = new  
     LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
     // button margins
     paramsLO2.setMargins(0, 20, 0, 0);
     // button height/width *pixels*

     btnLO.setOrientation(LinearLayout.VERTICAL);
     btnLO.setBackgroundColor(5); // not working correctly

     //buttons
     for (i =0;i &lt;reqdata.length;i++)
         {
             LinearLayout li=new LinearLayout(this);
             li.setOrientation(LinearLayout.HORIZONTAL);
             final Button b1 = new Button(MainActivity1.this);
             final ImageView imageView = new ImageView(MainActivity1.this);

             int width = 160;
             int height = 50;

             LinearLayout.LayoutParams parms = new  
      LinearLayout.LayoutParams(width,height);
             parms.setMargins(0, 2, 0, 0);
             imageView.setLayoutParams(parms);

             li.addView(b1, paramsLO);        
             li.addView(imageView);
             btnLO.addView(li);

             b1.setText(reqdata[i].getSpinnerText());

             b1.setOnClickListener(new View.OnClickListener() 
                    {
                        public void onClick(View v) 
                        {               


                             imageView1 = imageView;

                             Intent pictureActionIntent = new 
     Intent(MediaStore.ACTION_IMAGE_CAPTURE); 

   pictureActionIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(new  
   File(SDCARD_ROOT_PATH + SAVE_PATH_IN_SDCARD,IMAGE_CAPTURE_NAME)));  

    startActivityForResult(pictureActionIntent,CAMERA_PICTURE);
                             b1.setClickable(false);


                          } 

                    });    

         }

     final Button b2 = new Button(MainActivity1.this);

     b2.setText("Submit");
     b2.setWidth(150);
     b2.setHeight(50);
     b2.setOnClickListener(new View.OnClickListener() 
     {
         public void onClick(View v) 
         {                           

             long visitID = dbConnector.saveVisit();

             for (i =0;i &lt;reqdata.length;i++)
             {

  dbConnector.saveVisitDetail(listByte.get(i),visitID,Long.valueOf(reqdata[i].g
  etValue()).longValue());
             }     
                Toast.makeText(getBaseContext(),  
  "Sucessful",Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(MainActivity1.this,  
   Main.class);     
                startActivity(intent);
                finish();
         }
     }); 
     btnLO.addView(b2, paramsLO2);
     btnLO.setGravity(Gravity.CENTER| Gravity.CENTER_HORIZONTAL);
     scroll.addView(btnLO);

     this.addContentView(scroll, new LayoutParams());

    }



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

            if (imageReturnedIntent.getExtras() != null) 
                {
                    // here is the image from camera
                    yourSelectedImage = (Bitmap)  
    imageReturnedIntent.getExtras().get("data");
                    ByteArrayOutputStream outStr = new  
  ByteArrayOutputStream();                

  yourSelectedImage.compress(CompressFormat.JPEG, 100, outStr);
                    blob = outStr.toByteArray();
                    yourSelectedImage =  
  BitmapFactory.decodeByteArray(blob, 0, blob.length);
                    imageView1.setImageBitmap(yourSelectedImage);
                    listByte.add(blob);

                }
</code></pre>
