FileDocCategorySizeDatePackage
Utilities.javaAPI DocAndroid 1.5 API7779Wed May 06 22:42:46 BST 2009com.android.launcher

Utilities

public final class Utilities extends Object
Various utilities shared amongst the Launcher's classes.

Fields Summary
private static int
sIconWidth
private static int
sIconHeight
private static final android.graphics.Paint
sPaint
private static final android.graphics.Rect
sBounds
private static final android.graphics.Rect
sOldBounds
private static android.graphics.Canvas
sCanvas
Constructors Summary
Methods Summary
static android.graphics.BitmapcenterToFit(android.graphics.Bitmap bitmap, int width, int height, android.content.Context context)


     
        sCanvas.setDrawFilter(new PaintFlagsDrawFilter(Paint.DITHER_FLAG,
                Paint.FILTER_BITMAP_FLAG));
    
        final int bitmapWidth = bitmap.getWidth();
        final int bitmapHeight = bitmap.getHeight();

        if (bitmapWidth < width || bitmapHeight < height) {
            int color = context.getResources().getColor(R.color.window_background);

            Bitmap centered = Bitmap.createBitmap(bitmapWidth < width ? width : bitmapWidth,
                    bitmapHeight < height ? height : bitmapHeight, Bitmap.Config.RGB_565);
            Canvas canvas = new Canvas(centered);
            canvas.drawColor(color);
            canvas.drawBitmap(bitmap, (width - bitmapWidth) / 2.0f, (height - bitmapHeight) / 2.0f,
                    null);

            bitmap = centered;
        }

        return bitmap;
static android.graphics.BitmapcreateBitmapThumbnail(android.graphics.Bitmap bitmap, android.content.Context context)
Returns a Bitmap representing the thumbnail of the specified Bitmap. The size of the thumbnail is defined by the dimension android.R.dimen.launcher_application_icon_size. This method is not thread-safe and should be invoked on the UI thread only.

param
bitmap The bitmap to get a thumbnail of.
param
context The application's context.
return
A thumbnail for the specified bitmap or the bitmap itself if the thumbnail could not be created.

        if (sIconWidth == -1) {
            final Resources resources = context.getResources();
            sIconWidth = sIconHeight = (int) resources.getDimension(
                    android.R.dimen.app_icon_size);
        }

        int width = sIconWidth;
        int height = sIconHeight;

        final int bitmapWidth = bitmap.getWidth();
        final int bitmapHeight = bitmap.getHeight();

        if (width > 0 && height > 0 && (width < bitmapWidth || height < bitmapHeight)) {
            final float ratio = (float) bitmapWidth / bitmapHeight;

            if (bitmapWidth > bitmapHeight) {
                height = (int) (width / ratio);
            } else if (bitmapHeight > bitmapWidth) {
                width = (int) (height * ratio);
            }

            final Bitmap.Config c = (width == sIconWidth && height == sIconHeight) ?
                    bitmap.getConfig() : Bitmap.Config.ARGB_8888;
            final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
            final Canvas canvas = sCanvas;
            final Paint paint = sPaint;
            canvas.setBitmap(thumb);
            paint.setDither(false);
            paint.setFilterBitmap(true);
            sBounds.set((sIconWidth - width) / 2, (sIconHeight - height) / 2, width, height);
            sOldBounds.set(0, 0, bitmapWidth, bitmapHeight);
            canvas.drawBitmap(bitmap, sOldBounds, sBounds, paint);
            return thumb;
        }

        return bitmap;
static android.graphics.drawable.DrawablecreateIconThumbnail(android.graphics.drawable.Drawable icon, android.content.Context context)
Returns a Drawable representing the thumbnail of the specified Drawable. The size of the thumbnail is defined by the dimension android.R.dimen.launcher_application_icon_size. This method is not thread-safe and should be invoked on the UI thread only.

param
icon The icon to get a thumbnail of.
param
context The application's context.
return
A thumbnail for the specified icon or the icon itself if the thumbnail could not be created.

        if (sIconWidth == -1) {
            final Resources resources = context.getResources();
            sIconWidth = sIconHeight = (int) resources.getDimension(
                    android.R.dimen.app_icon_size);
        }

        int width = sIconWidth;
        int height = sIconHeight;

        final int iconWidth = icon.getIntrinsicWidth();
        final int iconHeight = icon.getIntrinsicHeight();

        if (icon instanceof PaintDrawable) {
            PaintDrawable painter = (PaintDrawable) icon;
            painter.setIntrinsicWidth(width);
            painter.setIntrinsicHeight(height);
        }

        if (width > 0 && height > 0) {
            if (width < iconWidth || height < iconHeight) {
                final float ratio = (float) iconWidth / iconHeight;

                if (iconWidth > iconHeight) {
                    height = (int) (width / ratio);
                } else if (iconHeight > iconWidth) {
                    width = (int) (height * ratio);
                }

                final Bitmap.Config c = icon.getOpacity() != PixelFormat.OPAQUE ?
                            Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565;
                final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
                final Canvas canvas = sCanvas;
                canvas.setBitmap(thumb);
                // Copy the old bounds to restore them later
                // If we were to do oldBounds = icon.getBounds(),
                // the call to setBounds() that follows would
                // change the same instance and we would lose the
                // old bounds
                sOldBounds.set(icon.getBounds());
                final int x = (sIconWidth - width) / 2;
                final int y = (sIconHeight - height) / 2;
                icon.setBounds(x, y, x + width, y + height);
                icon.draw(canvas);
                icon.setBounds(sOldBounds);
                icon = new FastBitmapDrawable(thumb);
            } else if (iconWidth < width && iconHeight < height) {
                final Bitmap.Config c = Bitmap.Config.ARGB_8888;
                final Bitmap thumb = Bitmap.createBitmap(sIconWidth, sIconHeight, c);
                final Canvas canvas = sCanvas;
                canvas.setBitmap(thumb);
                sOldBounds.set(icon.getBounds());
                final int x = (width - iconWidth) / 2;
                final int y = (height - iconHeight) / 2;
                icon.setBounds(x, y, x + iconWidth, y + iconHeight);
                icon.draw(canvas);
                icon.setBounds(sOldBounds);
                icon = new FastBitmapDrawable(thumb);
            }
        }

        return icon;