Android 图片特效处理的方法实例

// zoom 放缩  
public static Bitmap zoomBitmap(Bitmap bitmap, int w, int h) {  
    int width = bitmap.getWidth();  
    int height = bitmap.getHeight();  
    Matrix matrix = new Matrix();  

    float scaleWidth = w / (float) width;  
    float scaleHeight = h / (float) height;  
    matrix.postScale(scaleWidth, scaleHeight);  

    Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, width, height,  
            matrix, true);  
    return bitmap2;  
} 

 

 

// Round Corner Bitmap 获得圆角图片  
public static Bitmap getRoundCornerBitmap(Bitmap bitmap, float roundPX /*圆角的半径*/) {  
    int width = bitmap.getWidth();  
    int height = bitmap.getHeight();  

    Bitmap bitmap2 = Bitmap.createBitmap(width, height, Config.ARGB_8888);  
    Canvas canvas = new Canvas(bitmap2);  

    final int color = 0xff424242;  
    final Paint paint = new Paint();  
    final Rect rect = new Rect(0, 0, width, height);  
    final RectF rectF = new RectF(rect);  

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

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

    return bitmap2;  
} 

 

 

// Reflect Bitmap 获得带倒影的图片  
public static Bitmap createReflectedBitmap(Bitmap bitmap) {  
    //倒影和图片本身的间距  
    final int reflectedGap = 4;  
    int width = bitmap.getWidth();  
    int height = bitmap.getHeight();  

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

    Bitmap reflectedImage = Bitmap.createBitmap(bitmap, 0, height / 2,  
            width, height / 2, matrix, false);  
    Bitmap reflectedBitmap = Bitmap.createBitmap(width,  
            (height + height / 2), Config.ARGB_8888);  

    Canvas canvas = new Canvas(reflectedBitmap);  
    canvas.drawBitmap(bitmap, 0, 0, null);  
    Paint defaultPaint = new Paint();  
    canvas.drawRect(0, height, width, height + reflectedGap, defaultPaint);  
    canvas.drawBitmap(reflectedImage, 0, height + reflectedGap, null);  

    Paint paint = new Paint();  
    LinearGradient shader = new LinearGradient(0, bitmap.getHeight(), 0,  
            reflectedBitmap.getHeight() + reflectedGap, 0x70ffffff,  
            0x00ffffff, TileMode.CLAMP);  
    paint.setShader(shader);  
    paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN));  
    canvas.drawRect(0, height, width, reflectedBitmap.getHeight()  
            + reflectedGap, paint);  

    return reflectedBitmap;  
}