Android Utililty Methods Bitmap Resize

List of utility methods to do Bitmap Resize

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Description

The list of methods to do Bitmap Resize are organized into topic(s).

Method

BitmapresizeBitmap(Context context, int resId, int w, int h)
resize Bitmap 
Bitmap source = decodeFromResource(context.getResources(), resId);
return ThumbnailUtils.extractThumbnail(source, w, h);
BitmapresizeBitmapByScale(Bitmap bitmap, float scale, boolean recycle)
resize Bitmap By Scale 
int width = Math.round(bitmap.getWidth() * scale);
int height = Math.round(bitmap.getHeight() * scale);
if (width == bitmap.getWidth() && height == bitmap.getHeight())
    return bitmap;
Bitmap target = Bitmap.createBitmap(width, height,
        getConfig(bitmap));
Canvas canvas = new Canvas(target);
canvas.scale(scale, scale);
...
BitmapresizeDownBySideLength(Bitmap bitmap, int maxLength, boolean recycle)
resize Down By Side Length 
int srcWidth = bitmap.getWidth();
int srcHeight = bitmap.getHeight();
float scale = Math.min((float) maxLength / srcWidth,
        (float) maxLength / srcHeight);
if (scale >= 1.0f)
    return bitmap;
return resizeBitmapByScale(bitmap, scale, recycle);
DrawableresizeDrawable(Context context, int resId, int w, int h)
resize Drawable 
Bitmap source = resizeBitmap(context, resId, w, h);
return new BitmapDrawable(context.getResources(), source);
BitmapresizePreviewBitmap(Bitmap bm, int width, int height)
resize Preview Bitmap 
try {
    if (bm != null) {
        Bitmap resizebm = Bitmap.createScaledBitmap(bm, width,
                height, true);
        return resizebm;
    } else {
        return null;
} catch (OutOfMemoryError e) {
    return null;
BitmapsmallImage(Bitmap bitmap, int Width, int Height)
small Image 
int oldWidth = bitmap.getWidth();
int oldHeight = bitmap.getHeight();
float scaleWidth = ((float) Width) / oldWidth;
float scaleHeight = ((float) Height) / oldHeight;
Matrix matrix = new Matrix();
matrix.postScale(scaleWidth, scaleHeight);
return Bitmap.createBitmap(bitmap, 0, 0, oldWidth, oldHeight,
        matrix, true);
...
BitmapzoomBitmap(Bitmap bgimage, int newWidth, int newHeight)
zoom Bitmap 
int width = bgimage.getWidth();
int height = bgimage.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
matrix.postScale(scaleWidth, scaleHeight);
Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
        matrix, true);
...
BitmapzoomBitmap(Bitmap bitmap, int width, int height)
zoom Bitmap 
int w = bitmap.getWidth();
int h = bitmap.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) width / w);
float scaleHeight = ((float) height / h);
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, w, h, matrix,
        true);
...
BitmapzoomBitmapAdjustScreen(Activity activity, String imagePath)
zoom Bitmap Adjust Screen 
Bitmap bm = null;
BitmapFactory.Options opt = new BitmapFactory.Options();
opt.inJustDecodeBounds = true;
bm = BitmapFactory.decodeFile(imagePath, opt);
int picWidth = opt.outWidth;
int picHeight = opt.outHeight;
WindowManager windowManager = activity.getWindowManager();
Display display = windowManager.getDefaultDisplay();
...
BitmapzoomImage(Bitmap bgimage, int newWidth, int newHeight)
zoom Image 
int width = bgimage.getWidth();
int height = bgimage.getHeight();
Matrix matrix = new Matrix();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
matrix.postScale(scaleWidth, scaleHeight);
Bitmap bitmap = Bitmap.createBitmap(bgimage, 0, 0, width, height,
        matrix, true);
...