How to display bitmap pixel by pixel in Android?

Question

I am trying to display a bitmap image pixel by pixel (which explicitly means with some delay).
For that I am using two "for-loops", but it prints only a single row of pixels...

My code:

Button start = (Button) findViewById(R.id.start);
start.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        //Toast.makeText(getBaseContext(), "Printing...", Toast.LENGTH_SHORT).show();
        iImageArray = new int[bMap.getWidth()* bMap.getHeight()];                                   //initializing the array for the image size
        bMap.getPixels(iImageArray, 0, bMap.getWidth(), 0, 0, bMap.getWidth(), bMap.getHeight());   //copy pixel data from the Bitmap into the 'intArray' array  
             
        //Canvas canvas = new Canvas (bMap);
        //replace the red pixels with yellow ones  
        for (int i=0; i < bMap.getHeight(); i++) {  
            for(int j=0; j<bMap.getWidth(); j++) {
                iImageArray[j] = 0xFFFFFFFF;
            } 
        } 
        bMap = Bitmap.createBitmap(iImageArray, bMap.getWidth(), bMap.getHeight(), Bitmap.Config.ARGB_8888);//Initialize the bitmap, with the replaced color
        image.setImageBitmap(bMap);
        //canvas.drawPoints(iImageArray, 0, bMap.getHeight()*bMap.getWidth(), paint);
    }
});

And I want to print the bitmap in grayscale and for that I found this code...

public Bitmap toGrayscale(Bitmap bmpOriginal) {        
    int width, height;
    height = bmpOriginal.getHeight();
    width = bmpOriginal.getWidth();    

    Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint();
    ColorMatrix cm = new ColorMatrix();
    cm.setSaturation(0);

    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);
    paint.setColorFilter(f);

    c.drawBitmap(bmpOriginal, 0, 0, paint);

    return bmpGrayscale;
}

It is iImageArray[i] = 0xFFFFFFFF; that I have to test, not the actual grayscale value...

Answer 1

I also made a program that reads the RGB colors of every pixels from an image. Here is my code to read:

int orgWidth = bmp.getWidth();
int orgHeight = bmp.getHeight();
//define the array size
int[] pixels = new int[orgWidth * orgHeight];

bmp.getPixels(pixels, 0, orgWidth, 0, 0, orgWidth, orgHeight);

for (int y = 0; y < orgHeight; y++){
    for (int x = 0; x < orgWidth; x++){
    }
}

This is how my array works. I made a question for ranged pixel check last week, however I also fixed it by my self :) Optimize Color range check with nested for loop

EDIT:

Now I see, sorry. at: iImageArray[j] = 0xFFFFFFFF; also add iImageArray[i] = 0xFFFFFFFF; then it should work