/**
* 縮放Bitmap
*
* @param src 原bitmap
* @param width 縮放后的寬度
* @param height 縮放后的高度
* @return 縮放后的bitmap
*/
public static Bitmap scaleBitmap(Bitmap src, int width, int height) {
int srcW = src.getWidth();
int srcH = src.getHeight();
Matrix matrix = new Matrix();
matrix.setScale(((float) width) / srcW, ((float) height) / srcH);
return Bitmap.createBitmap(src, 0, 0, srcW, srcH, matrix, false);
}
/**
* 將原bitmap裁剪成正方形
*
* @param src 原bitmap
* @return 正方形的bitmap
*/
public static Bitmap centerCropSquare(Bitmap src) {
int w = src.getWidth();
int h = src.getHeight();
System.out.println(w + "," + h);
if (w == h) {
return src;
} else if (w > h) {
return Bitmap.createBitmap(src, (w - h) / 2, 0, h, h);
} else {
return Bitmap.createBitmap(src, 0, (h - w) / 2, w, w);
}
}
/**
* 創(chuàng)建圓形的Bitmap
*
* @param src 原Bitmap
* @return 創(chuàng)建的圓形Bitmap
*/
public static Bitmap createRoundBitmap(Bitmap src) {
if (src == null) return null;
Bitmap bmp = centerCropSquare(src);//首先裁剪成正方形
int size = bmp.getWidth();
RectF rectF = new RectF(0, 0, size, size);
Bitmap bg = Bitmap.createBitmap(size, size, bmp.getConfig());
bg.setDensity(bmp.getDensity()); // <======= 注意
Canvas canvas = new Canvas(bg);
Paint paint = new Paint();
paint.setAntiAlias(true);
canvas.drawRoundRect(rectF, size / 2, size / 2, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
canvas.drawBitmap(bmp, 0, 0, paint);
return bg;
}
/**
* 旋轉(zhuǎn)Bitmap
* 注：該方法會(huì)導(dǎo)致Bitmap大小變大
*
* @param src 原bitmap
* @param degree 旋轉(zhuǎn)角度
* @return 旋轉(zhuǎn)之后的bitmap
*/
public static Bitmap rotateBitmap(Bitmap src, int degree) {
Matrix matrix = new Matrix();
matrix.postRotate(degree);
return Bitmap.createBitmap(src, 0, 0, src.getWidth(), src.getHeight(), matrix, false);
}
