android image最常用操作

/**
 * @author LuoXianXiong [email protected]
 * @version 1.0
 * @deprecation imageUtil
 */
public class ImageUtil {

    // Zoom-in Bitmap
    public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {
        if (w <= 0 || h <= 0) {
            return bitmap;
        }
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();
        Matrix matrix = new Matrix();
        float scaleWidht = ((float) w / width);
        float scaleHeight = ((float) h / height);
        matrix.postScale(scaleWidht, scaleHeight);
        Bitmap newbmp = Bitmap.createBitmap(bitmap, 0, 0, width, height, matrix, true);
        return newbmp;
    }

    // Will Drawable into Bitmap
    public static Bitmap drawableToBitmap(Drawable drawable) {
        int width = drawable.getIntrinsicWidth();
        int height = drawable.getIntrinsicHeight();
        Bitmap bitmap = Bitmap.createBitmap(width, height,
                drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, width, height);
        drawable.draw(canvas);
        return bitmap;

    }

    // Get round Bitmap
    public static Bitmap getRoundedCornerBitmap(Bitmap bitmap, float roundPx) {

        Bitmap output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);

        final int color = 0xff424242;
        final Paint paint = new Paint();
        final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());
        final RectF rectF = new RectF(rect);

        paint.setAntiAlias(true);
        canvas.drawARGB(0, 0, 0, 0);
        paint.setColor(color);
        canvas.drawRoundRect(rectF, roundPx, roundPx, paint);

        paint.setXfermode(new PorterDuffXfermode(Mode.SRC_IN));
        canvas.drawBitmap(bitmap, rect, rect, paint);

        return output;
    }

    // Get reflection Bitmap
    public static Bitmap createReflectionImageWithOrigin(Bitmap bitmap) {
        final int reflectionGap = 4;
        int width = bitmap.getWidth();
        int height = bitmap.getHeight();

        Matrix matrix = new Matrix();
        matrix.preScale(1, -1);

        Bitmap reflectionImage = Bitmap.createBitmap(bitmap, 0, height / 2, width, height / 2, matrix, false);

        Bitmap bitmapWithReflection = Bitmap.createBitmap(width, (height + height / 2), Config.ARGB_8888);

        Canvas canvas = new Canvas(bitmapWithReflection);
        canvas.drawBitmap(bitmap, 0, 0, null);
        Paint deafalutPaint = new Paint();
        canvas.drawRect(0, height, width, height + reflectionGap, deafalutPaint);

        canvas.drawBitmap(reflectionImage, 0, height + reflectionGap, null);

        Paint paint = new Paint();
        LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0, bitmapWithReflection.getHeight()
                + reflectionGap, 0x70ffffff, 0x00ffffff, TileMode.CLAMP);
        paint.setShader(shader);
        // Set the Transfer mode to be porter duff and destination in
        paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));
        // Draw a rectangle using the paint with our linear gradient
        canvas.drawRect(0, height, width, bitmapWithReflection.getHeight() + reflectionGap, paint);

        return bitmapWithReflection;
    }

    // Create adaptive drawable by drawableId
    public static Drawable createAdaptiveDrawableByDrawableId(Activity activity, int drawableId) {
        Display display = activity.getWindowManager().getDefaultDisplay();
        int width = display.getWidth();
        int height = display.getHeight();
        Bitmap bitmap = ((BitmapDrawable) activity.getResources().getDrawable(drawableId)).getBitmap();
        bitmap = ImageUtil.zoomBitmap(bitmap, width, height);
        Drawable drawable = new BitmapDrawable(bitmap);
        return drawable;
    }

    // Create adaptive drawable by bitmap
    public static Drawable createAdaptiveDrawableByBitmap(Activity activity, Bitmap bitmap) {
        Display display = activity.getWindowManager().getDefaultDisplay();
        int width = display.getWidth();
        int height = display.getHeight();
        bitmap = ImageUtil.zoomBitmap(bitmap, width, height);
        Drawable drawable = new BitmapDrawable(bitmap);
        return drawable;
    }

}