How to modify the image file

NeoLiu · by **NeoLiu** » Sun Jan 13, 2008 8:28 am

Hi guys
In my code
i want touch point on the image.

Bitmap = BitmapFactory.decode(path);

but the bitmap is immutable.

how to set the bitmap to mutable.

plusminus · by **plusminus** » Sun Jan 13, 2008 11:16 am

Hello NeoLiu,

the only static "constructor" for Bitmap returning a mutable one is:

(Class: Bitmap) public static Bitmap createBitmap(int width, int height, boolean hasAlpha)
Returns: a mutable bitmap with the specified width and height.

So you could work with getPixels/setPixels or like this:

Syntax: [ Download ] [ Hide ]

Using java Syntax Highlighting

        Bitmap bitmapResult = bm.createBitmap(widthOfOld, heightOfOld, hasAlpha);
        Canvas c = new Canvas();
        c.setDevice(bitmapResult); // drawXY will result on that Bitmap
        c.drawBitmap(bitmapOld, left, top, paint);
Parsed in 0.031 seconds,  using GeSHi 1.0.8.4

Regards,
plusminus

NeoLiu · by **NeoLiu** » Mon Jan 14, 2008 3:37 am

Hi plusminus

i can modify the image content when i used this method

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Using java Syntax Highlighting

        Resources r = this.getContext().getResources();
 
        loadTile(r.getDrawable(R.drawable.a));
 
    public void loadTile(Drawable tile) {
 
        Bitmap bitmap = Bitmap.createBitmap(maxEditWidth, maxEditHeight, true);
 
        Canvas canvas = new Canvas(bitmap);
 
        tile.setBounds(0, 0, maxEditWidth, maxEditHeight);
 
        tile.draw(canvas);
 
        mBitmap = bitmap;
 
        mCanvas = canvas;
 
    }
 
    protected void onDraw(Canvas canvas) {
 
        if (mBitmap != null) {
 
            canvas.drawBitmap(mBitmap, 0, 0, null);
 
            //canvas.drawBitmap(BitmapA, 0, 0, null);
 
        }
 
    }
 
Parsed in 0.033 seconds,  using GeSHi 1.0.8.4

but i have a new problem, how to get the drawable from Bitmap

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Using java Syntax Highlighting

BitmapA = BitmapFactory.decode(path);
 
Parsed in 0.033 seconds,  using GeSHi 1.0.8.4

Drawable ?

plusminus · by **plusminus** » Mon Jan 14, 2008 8:32 am

Hello NeoLiu,

by using the BitmapDrawable-Subclass which extends Drawable, like this:

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Using java Syntax Highlighting

        Bitmap myBitmap = BitmapFactory.decode(path); 
        Drawable bd = new BitmapDrawable(myBitmap);
Parsed in 0.035 seconds,  using GeSHi 1.0.8.4

Let us know if it helped you.

Regards,
plusminus

NeoLiu · by **NeoLiu** » Tue Jan 15, 2008 3:06 am

Thanks, it works

How to modify the image file

How to modify the image file

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