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  • android简单图片处理

    网上收集一些对图片处理的代码以便以后能用到

    一、图片翻转(得到翻转180度后的图片)

    Matrix m = new Matrix();    

    m.setScale(-1, 1);    

    Bitmap newBit = Bitmap.createBitmap(bit, 0, 0, bit.getWidth(), bit.getHeight(), m,true);

    二、图片放大缩小

    Matrix m = new Matrix();   

    m.setScale(0.5f, 0.5f);//缩小为一半,缩放比例大于一放大s   

    Bitmap newBit = Bitmap.createBitmap(bit, 0, 0, bit.getWidth(), bit.getHeight(), m,true);

    三、带倒影

    //获得带倒影的图片方法

    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; }

    四、圆角图片s

    //获得圆角图片的方法

    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; }

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  • 原文地址:https://www.cnblogs.com/xiaoxiaoboke/p/2314632.html
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