[android-developers] Re: How to draw pixels?

Sounds like you just need to create your own subclass of View, feed it
the binary data to draw as that data becomes available, and put your
logic below into the onDraw method using the drawing primitive of the
Canvas object it receives.

Doug

On Dec 3, 6:30 pm, Vincent <renws1...@gmail.com> wrote:
> Thanks for replying, I think I didn't describe my needs clearly.
> What I want are:
> 1. Use 30 bytes to represent one line
> 2. One byte has 8 bits, each bit to represent one pixel.
> 3. So one line has 240 (30x8) pixels.
> 4. If a bit's value is 0, set a pixel to black
> 5. If 1, set a pixel to white
> 6. I have 120 lines to draw.
> 7. I need to update each line very often.
>
> So, not if one bit is 0, then draw a black line.
>
> And for expanding the encoding, could you give any hint?
>
> Thank you.
>
> On Dec 4, 12:28 pm, James Black <planiturth...@gmail.com> wrote:
>
>
>
>
>
>
>
> > You will need to expand the encoding you have and then it would seem the
> > best approach is to have a white background, then just draw a line (http://stackoverflow.com/questions/3616676/how-to-draw-a-line-in-android)
> > for the black lines, so, you would need to find the start of the current
> > line segment, see how many pixels in that segment, then draw the line, then
> > skip over the white ones (that would be like drawing a white line) and draw
> > the next black line segment.
>
> > On Sat, Dec 3, 2011 at 7:34 PM, Vincent <renws1...@gmail.com> wrote:
> > > Hi,
>
> > > I want to draw an image from bytes. E.g. I have a byte "01111010",  a
> > > black pixel for a 0, a white pixel for a 1, then I need draw an 8
> > > pixels line "black white white white white black white black white" on
> > > the screen.
>
> > > I have about 3000 bytes (30 bytes per line)to draw an image, and I
> > > need to update the image frequently.
>
> > > Could you give any suggestion? Is Bitmap.createBitmap from colors
> > > array applicable?
>
> > > Android 3.2
>
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> > sure you realize that what you heard is not what I meant."
> > - Robert McCloskey

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