Canvas - getWidth (), getHeight () and OnClickListener ()

I'm making an app for Android using the Canvas class, but I'm having some problems.

1st. When you run the methods below,

canvas.drawText("Width: " + fotoOriginal.getWidth(), 0, 10, paint);
canvas.drawText("Height: " + fotoOriginal.getHeight(), 0, 20, paint);

I see on the screen: "Width: 1580" and "Height: 977", that is, my photo has 1580 x 977 px.

But when I try to write on the screen the ratio of width to height,

myRatio = fotoOriginal.getWidth() / fotoOriginal.getHeight();
canvas.drawText("Ratio is: " + myRatio, 0, 30, paint);

The result that appears on the screen is 1.0. No matter what I do, the result is always 1 or 0. Why does not the real reason for the image appear, that is, 1,617 ...

2nd. As I said, the getWidth () and getHeight () methods return me 1580 and 977 respectively, but when I go to the photo file and hover over it, "Dimensions: 1053 x 651" appears, the same dimension that appears in Paint. Why is there a difference in size?

3 °. What is the most correct way (and where) to add the OnClickListener (), for example to draw anything on Canvas when a user clicks the screen?

Follow the code:

public class MyActivity extends Activity{

public int teste = 0;

DrawView drawView;

public static int width;
public static int height;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Para a activity pegar a tela inteira
    fullscreen();

    // Para saber o tamanho da tela
    Display display = getWindowManager().getDefaultDisplay();

    Point size = new Point();
    display.getSize(size);
    width = size.x;
    height = size.y;

    Toast.makeText(getApplicationContext(), "Screen size is: " + width + " px (X), and " + height + "px (Y)!", Toast.LENGTH_LONG).show();

    // DrawView
    drawView = new DrawView(this);
    drawView.setOnClickListener(new HeyClick());
    drawView.setBackgroundColor(Color.WHITE);

    setContentView(drawView);

}

public void fullscreen(){

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

}

public class HeyClick implements View.OnClickListener{

    @Override
    public void onClick(View v) {

        Toast.makeText(getApplicationContext(), "" + teste, Toast.LENGTH_SHORT).show();
        teste++;

    }

}

}

The other class:

public class DrawView extends View{

Paint paint = new Paint();

int x = MyActivity.width;
int y = MyActivity.height;

Bitmap fotoOriginal;
Bitmap fotoScaled;
float myRatio;


public DrawView(Context context) {
    super(context);

    paint.setColor(Color.BLACK);

    fotoOriginal = BitmapFactory.decodeResource(getResources(), R.drawable.ilha_de_malaga_transparente);
    fotoScaled = Bitmap.createScaledBitmap(fotoOriginal, x, y, false);

    myRatio = fotoOriginal.getWidth() / fotoOriginal.getHeight();

}

@Override
protected void onDraw(Canvas canvas) {

    canvas.drawBitmap(fotoScaled,0,0, paint);
    canvas.drawText("Width: " + fotoOriginal.getWidth(), 0, 10, paint);
    canvas.drawText("Height: " + fotoOriginal.getHeight(), 0, 20, paint);
    canvas.drawText("Ratio is: " + myRatio, 0, 30, paint);

}

}