Rotate zoom drag image in android imageview

I want to be able to rotate, zoom and move an image in android framelayout and imageview. With the following code I am able to do it. But the view sometimes gets out of UI. As you can c I handle the rotation in ACTION_UP(90 degree rotation for each ACTION_UP) motionevent. following is my main.xml:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" >
   <ImageView android:id="@+id/imageView"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent"
         android:src="@drawable/csf6a4_flipped"
         android:scaleType="matrix" >
   </ImageView>
</FrameLayout>

and following is my java file:

package com.example.rotatezoommove;



import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.os.Bundle;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;

public class RotateZoomMove extends Activity implements OnTouchListener {
   private static final String TAG = "Touch";
   // These matrices will be used to move and zoom image
   Matrix matrix = new Matrix();
   Matrix savedMatrix = new Matrix();

   // We can be in one of these 3 states
   static final int NONE = 0;
   static final int DRAG = 1;
   static final int ZOOM = 2;
   int mode = NONE;

   // Remember some things for zooming
   PointF start = new PointF();
   PointF mid = new PointF();
   float oldDist = 1f;

   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
      ImageView view = (ImageView) findViewByI