No suitable method found in my overriden methods mono for android - events

Question

I'm trying to draw a line based on touch event. Basically it draws line as the finger moves. I'm getting an error when overriding ontouchevent and onsizechanged. It was originally written in JAVA. I just translated it to C#. Here's the code:
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
currentLevel = Intent.GetIntExtra("gameLevel", 0);
playerScore = Intent.GetIntExtra("score", 0);
SetContentView(new SampleView(this));
// Create your application here
}
private class SampleView : View
{
private Paint mPaint;
private static Bitmap m_bitmap;
private DisplayMetrics m_metrics;
private Canvas m_canvas;
private Path m_path;
private Paint m_bitmapPaint;
private float m_X, m_Y;
static bool m_pathDrawn = false;
private static float TOUCH_TOLERANCE = 4;
public SampleView(Context context)
: base(context)
{
Focusable = true;
mPaint = new Paint();
mPaint.AntiAlias = true;
mPaint.Dither = true;
mPaint.SetStyle(Paint.Style.Stroke);
mPaint.StrokeWidth = 12;
mPaint.StrokeJoin = Paint.Join.Round;
mPaint.StrokeCap = Paint.Cap.Round;
m_metrics = context.Resources.DisplayMetrics;
m_bitmap = Bitmap.CreateBitmap(m_metrics.WidthPixels, m_metrics.HeightPixels, Bitmap.Config.Argb8888);
m_canvas = new Canvas(m_bitmap);
m_bitmapPaint = new Paint();
}
public void onerase()
{
m_canvas = null;
}
protected override void onSizeChanged(int p_w, int p_h, int p_oldw, int p_oldh)
{
this.onSizeChanged(p_w, p_h, p_oldw, p_oldh);
}
protected override void OnDraw(Canvas canvas)
{
canvas.DrawColor(Color.Black);
canvas.DrawBitmap(m_bitmap, 0, 0, m_bitmapPaint);
canvas.DrawPath(m_path, mPaint);
}
private void touch_start(float p_x, float p_y)
{
m_path.Reset();
m_path.MoveTo(p_x, p_y);
m_X = p_x;
m_Y = p_y;
}
private void touch_move(float p_x, float p_y)
{
float m_dx = Math.Abs(p_x - m_X);
float m_dy = Math.Abs(p_y - m_Y);
if (m_dx >= TOUCH_TOLERANCE || m_dy >= TOUCH_TOLERANCE)
{
m_path.QuadTo(m_X, m_Y, (p_x + m_X) / 2, (p_y + m_Y) / 2);
m_X = p_x;
m_Y = p_y;
m_pathDrawn = true;
}
}
private void touch_up()
{
m_path.LineTo(m_X, m_Y);
// commit the path to our offscreen
m_canvas.DrawPath(m_path, mPaint);
// kill this so we don't double draw
m_path.Reset();
}
public override bool onTouchEvent(MotionEvent p_event)
{
float m_x = p_event.GetX();
float m_y = p_event.GetY();
switch (p_event.Action)
{
case MotionEventActions.Down:
touch_start(m_x, m_y);
Invalidate();
break;
case MotionEventActions.Move:
touch_move(m_x, m_y);
Invalidate();
break;
case MotionEventActions.Up:
touch_up();
Invalidate();
break;
}
return true;
}
}
Another thing. I want to make my image view from a layout as my canvas and draw the line there ontouchevent. How should I do this? Thanks!

Answer 1

Method name should use pascal casing.
Android.Views.View.OnTouchEvent Method
Android.Views.View.OnSizeChanged Method
public override bool OnTouchEvent(MotionEvent e)
{
}
protected override void OnSizeChanged(int w, int h, int oldw, int oldh)
{
}
Mono coding guidelines.