MyView

package com.example.karen.bitmap2;



import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View
{
    private Bitmap theBitmap1, theBitmap2;
    private static final int WIDTH = 50;
    private static final int HEIGHT = 50;
    private static final int STRIDE = 64; //musi byc >= WIDTH

    public MyView(Context context) //konstruktory...
    {
        super(context);
        initMyBitmaps();//wywołanie funkcji z dołu kodu
    }

    public MyView(Context context, AttributeSet attrs) //AttributeSet - klasa która jest zbiorem własciwosci layoutu(wymiary,kolory itp)
    {
        super(context, attrs);
        initMyBitmaps();
    }

    public MyView(Context context, AttributeSet attrs, int defStyleAttr)
    {
        super(context, attrs, defStyleAttr);
        initMyBitmaps();
    }

    @TargetApi(21)
    public MyView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes)
    {
        super(context, attrs, defStyleAttr, defStyleRes);
        initMyBitmaps();
    }

    private void initMyBitmaps()
    {
        Bitmap aBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.rocket);
        final int dstWidth = 100;
        final int dstHeight = 160;
        theBitmap1 = Bitmap.createScaledBitmap(aBitmap, dstWidth, dstHeight, true);
        int[] avColors = createColors();
        theBitmap2 = Bitmap.createBitmap(avColors, 0, STRIDE, WIDTH, HEIGHT, Bitmap.Config.ARGB_8888);
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        canvas.drawBitmap(theBitmap1, 0, 0, null);
        canvas.drawBitmap(theBitmap2, 150, 0, null);
    }

    private static int[] createColors()
    {
        int[] colors = new int[STRIDE * HEIGHT];
        for (int y = 0; y < HEIGHT; y++) {
            for (int x = 0; x < WIDTH; x++) {
                int r = x * 255 / (WIDTH - 1);
                int g = y * 255 / (HEIGHT - 1);
                int b = 255 - Math.min(r, g);
                int a = Math.max(r, g);
                colors[y * STRIDE + x] = (a << 24) | (r << 16) | (g << 8) | b;
            }
        }
        return colors;


    }
}