create button in android

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Mobile

Android

I am new to android.I want to know how to create button programatically.

public class SamActivity extends Activity
{
	  private Paint       mPaint;
	    private MaskFilter  mEmboss;
	    private MaskFilter  mBlur;
	    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        
        
	  view();
	  
        
    }
   
  
   
   
    public class MyView extends ImageView {

    	

        private Bitmap  mBitmap;
        private Canvas  mCanvas;
        private Path    mPath;
        private Paint   mBitmapPaint;
        
        public MyView(Context c) {
            super(c);

            mPath = new Path();
            mBitmapPaint = new Paint(Paint.DITHER_FLAG);
            
        }

        @Override
        protected void onSizeChanged(int w, int h, int oldw, int oldh) {
            super.onSizeChanged(w, h, oldw, oldh);
            mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
            mCanvas = new Canvas(mBitmap);
        }
        
        @Override
        protected void onDraw(Canvas canvas) 
        {
        	mPaint = new Paint();
            mPaint.setAntiAlias(true);
            mPaint.setDither(true);
           
            mPaint.setStyle(Paint.Style.STROKE);
            mPaint.setStrokeJoin(Paint.Join.ROUND);
            mPaint.setStrokeCap(Paint.Cap.ROUND);
            mPaint.setStrokeWidth(12);
mPaint.setColor(Color.RED);
            mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                                           0.4f, 6, 3.5f);

            mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
           
            Bitmap mBitmap1= BitmapFactory.decodeResource(getResources(), R.drawable.base);
            
            Bitmap bMapScaled = Bitmap.createScaledBitmap(mBitmap1, 10, 10, true);
        	canvas.drawBitmap(bMapScaled, 0,0, mPaint);
            canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
            canvas.drawPath(mPath, mPaint);
            super.onDraw(canvas);
            invalidate();
        }

        private float mX, mY;
        private static final float TOUCH_TOLERANCE = 4;

        private void touch_start(float x, float y)
        {
        	
            mPath.reset();
            mPath.moveTo(x, y);
            mX = x;
            mY = y;
        }
        private void touch_move(float x, float y) {
            float dx = Math.abs(x - mX);
            float dy = Math.abs(y - mY);
            if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
                mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
                mX = x;
                mY = y;
            }
        }
        private void touch_up() {
            mPath.lineTo(mX, mY);
            // commit the path to our offscreen
            mCanvas.drawPath(mPath, mPaint);
            // kill this so we don't double draw
            mPath.reset();
        }

        @Override
        public boolean onTouchEvent(MotionEvent event) 
        {
        	
        	
            float x = event.getX();
            float y = event.getY();

            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    touch_start(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_MOVE:
                    touch_move(x, y);
                    invalidate();
                    break;
                case MotionEvent.ACTION_UP:
                    touch_up();
                    invalidate();
                    break;
            }
            return true;
        }
        
        
    }
   public void view()
   {
	   
	   MyView mp = new MyView(this);
	   setContentView(mp);
	  
   }
  
}

This is my code.In this i draw a line on the image.But i cannot create a button in this.please help me.