Programiranje problem android

Delam program z veselja imam pa vprašnje, oz mi zadeva ne dela dobro.
Da vas seznanim z problemom:
-move
-zoom
Če mi kdo hoče pomagati mu pošljem kodo, limat jo ne mislim ker je predolga.
Lepo Vas Prosim, za pomoč.

lp
Matej

Muiči me bom zastavil izrez kode:
DrawHandler.java

private float xTouchCoordinate;
	private float yTouchCoordinate;
	private float previousX;
	private float previousY;
	private float oldDist;
	private boolean hasMoved;
	private boolean pinchToZoom;
	Point point;

	public void handleTouchEvent(MotionEvent event)
	{
		Point point1 = new Point(event.getX(), event.getY());
		point=point1;
		xTouchCoordinate = event.getX();
		yTouchCoordinate = event.getY();

		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			previousX = xTouchCoordinate;
			previousY = yTouchCoordinate;
			hasMoved = false;
			break;
		case MotionEvent.ACTION_MOVE:
			float dx = Math.abs(xTouchCoordinate - previousX);
			float dy = Math.abs(yTouchCoordinate - previousY);
		if (dx > moveThreshold || dy > moveThreshold) {
				hasMoved = true;
			}
			break;
		}
		// always allow pinch to zoom
		handlePinchToZoom(event);
		// if zooming, don't handle tools
		if (!pinchToZoom) {
			switch (SELECTED_SHAPE) {
		
			case LINE:
			case FREEHAND:
			case RECTANGLE:
			case CIRCLE:
			case OVAL:
			case ERASE:
			case FILL:
			case SPRAY:
				handleBrushTool(event);
				break;
			case MOVE:
				handleMoveTool(event);
				break;
			}
		}
		previousX = xTouchCoordinate;
		previousY = yTouchCoordinate;
	
	
		 
	}
	
	private float spacing(MotionEvent event) {
		float x = event.getX(0) - event.getX(1);
		float y = event.getY(0) - event.getY(1);
		return FloatMath.sqrt(x * x + y * y);
	}

	/**
	 * Scroll the picture.
	 */
	private void handleMoveTool(MotionEvent event) {
		switch (event.getAction()) {
		case MotionEvent.ACTION_MOVE:
			int dx = Math.round(xTouchCoordinate - previousX);
			int dy = Math.round(yTouchCoordinate - previousY);
			mPanel.scroll(dx, dy);
			break;
		}
	}

	/**
	 * Zoom into the picture or out of it.
	 */
	 void handlePinchToZoom(MotionEvent event) {
		switch (event.getAction()) {
		case MotionEvent.ACTION_POINTER_2_DOWN:
			oldDist = spacing(event) / mPanel.getZoom();
			pinchToZoom = true;
			break;
		case MotionEvent.ACTION_MOVE:
			if (pinchToZoom) {
				float newDist = spacing(event);
				if (newDist > 10) {
					float scale = newDist / oldDist;
					mPanel.zoom(scale);
				}
			}
			break;
		default:
			pinchToZoom = false;
		}
	}
	
	
	
	 void handleBrushTool(MotionEvent event) {

		if (SELECTED_SHAPE == SHAPES.ERASE)
		{
			mCurrentPaint = mErasePaint;

		}
		else
			mCurrentPaint = mPaint;

		switch (event.getAction())
		{
		case MotionEvent.ACTION_DOWN:
			mDownPoint = point;
			break;
		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_MOVE:
			setCurrentShape(SELECTED_SHAPE, point);
			if (mOnDrawListener != null)
			{
				if (event.getAction() == MotionEvent.ACTION_MOVE)
				{
					mOnDrawListener.onDrawShapeTemp(mCurrentShape, mCurrentPaint);
				}
				else
				{
					mOnDrawListener.onDrawShape(mCurrentShape, mCurrentPaint);
				}
			}
			break;
		}
		if (event.getAction() == MotionEvent.ACTION_UP)
		{
			GRAPHICOBJECTS.add(new AuditContainer(mCurrentShape.getPath(), mCurrentPaint));
			// undopaint.length;
			mCurrentShape = null;
		}
	}

Panel.java

float getZoom() {
		return zoom;
	}
	
	void scroll(int dx, int dy) {
		
			float surfaceZoomedWidth = rectSurface.right / zoom;
			float surfaceZoomedHeight = rectSurface.bottom / zoom;

			// Don't scroll if the (zoomed) bitmap is smaller than the surface.
			if ((surfaceZoomedWidth - rectBitmap.right) > 0 && (surfaceZoomedHeight - rectBitmap.bottom) > 0) {
				scroll.set(0, 0);
			} else {
				scroll.offset(Math.round(dx / zoom), Math.round(dy / zoom));
				float pivotX = surfaceCenter.x - (surfaceCenter.x / zoom);
				float pivotY = surfaceCenter.y - (surfaceCenter.y / zoom);
				float xMax = (surfaceZoomedWidth - rectBitmap.right) + pivotX;
				float yMax = (surfaceZoomedHeight - rectBitmap.bottom) + pivotY;
				if (scroll.x < xMax) {
					scroll.x = Math.round(xMax);
				}
				if (scroll.y < yMax) {
					scroll.y = Math.round(yMax);
				}
				// Make checks for upper left corner after checks for
				// lower right corner to prevent jumping.
				if (scroll.x - pivotX > 0) {
					scroll.x = Math.round(pivotX);
				}
				if (scroll.y - pivotY > 0) {
					scroll.y = Math.round(pivotY);
				}
			}
		
	}

	/**
	 * Set the zoom factor for the Canvas.
	 * 
	 * @param scale [1.0..*] Factor to zoom.
	 */
	void zoom(float scale) {
	
			if (zoom >= 1) {
				zoom = scale;
			}
			if (zoom < 1) {
				zoom = 1;
			}
		
	}

public boolean onTouchEvent(MotionEvent event)
	{
		// Če je ACTION_MOVE pa da se številka poveča iz 1 na 2 prekineš tmpDrawing pa skaliraš sliko.
		// Če je pa kuj 2, pa direkt začeneš skalirat.
		// event.getPointerCount()
		mDrawHandler.handleTouchEvent(event);
	//	mDrawHandler.handleBrushTool(event);
		return true;
	}

	public void drawBitmap(Bitmap btp)
	{
		displayCanvas = getHolder().lockCanvas();
		displayCanvas.scale(zoom, zoom, surfaceCenter.x, surfaceCenter.y);
		displayCanvas.translate(scroll.x, scroll.y);
	//	displayCanvas.drawPaint(checkeredPattern);
		displayCanvas.drawColor(mBackgroundColor);
		displayCanvas.drawBitmap(btp, 0, 0, null);
		getHolder().unlockCanvasAndPost(displayCanvas);
	}
	

Kompajlar javi tole:

10-07 20:52:49.882: W/dalvikvm(955): threadid=1: thread exiting with uncaught exception (group=0x40015560)
10-07 20:52:49.976: E/AndroidRuntime(955): FATAL EXCEPTION: main
10-07 20:52:49.976: E/AndroidRuntime(955): java.lang.NullPointerException
10-07 20:52:49.976: E/AndroidRuntime(955): at aa.bb.cc.DrawHandler.handleMoveTool(DrawHandler.java:477)
10-07 20:52:49.976: E/AndroidRuntime(955): at aa.bb.cc.DrawHandler.handleTouchEvent(DrawHandler.java:452)
10-07 20:52:49.976: E/AndroidRuntime(955): at aa.bb.cc.Panel.onTouchEvent(Panel.java:328)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.View.dispatchTouchEvent(View.java:3885)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:942)
10-07 20:52:49.976: E/AndroidRuntime(955): at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:1691)
10-07 20:52:49.976: E/AndroidRuntime(955): at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1125)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.app.Activity.dispatchTouchEvent(Activity.java:2096)
10-07 20:52:49.976: E/AndroidRuntime(955): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1675)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.ViewRoot.deliverPointerEvent(ViewRoot.java:2194)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.view.ViewRoot.handleMessage(ViewRoot.java:1878)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.os.Handler.dispatchMessage(Handler.java:99)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.os.Looper.loop(Looper.java:123)
10-07 20:52:49.976: E/AndroidRuntime(955): at android.app.ActivityThread.main(ActivityThread.java:3683)
10-07 20:52:49.976: E/AndroidRuntime(955): at java.lang.reflect.Method.invokeNative(Native Method)
10-07 20:52:49.976: E/AndroidRuntime(955): at java.lang.reflect.Method.invoke(Method.java:507)
10-07 20:52:49.976: E/AndroidRuntime(955): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
10-07 20:52:49.976: E/AndroidRuntime(955): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
10-07 20:52:49.976: E/AndroidRuntime(955): at dalvik.system.NativeStart.main(Native Method)
10-07 20:52:55.642: I/Process(955): Sending signal. PID: 955 SIG: 9

Tkole napamet... mPanel v razredu DrawHandler je null.