public class AdjustBitmap {
/**
* 将bitmap调整到指定大小
*/
public static BitmapsizeBitmap(Bitmap origin, int newWidth, int newHeight) {
if (origin ==null) {
return null;
}
int height = origin.getHeight();
int width = origin.getWidth();
float scaleWidth = ((float) newWidth) / width;
float scaleHeight = ((float) newHeight) / height;
Matrix matrix =new Matrix();
// 使用后乘
matrix.postScale(scaleWidth, scaleHeight);
Bitmap newBM = Bitmap.createBitmap(origin, 0, 0, width, height, matrix, false);
if (!origin.isRecycled()) {
//这时候origin还有吗？
origin.recycle();
}
return newBM;
}
/**
*
* @param origin
* @param scale
* @return 按比例缩放
*/
public static BitmapscaleBitmap(Bitmap origin, float scale) {
if (origin ==null) {
return null;
}
int width = origin.getWidth();
int height = origin.getWidth();
Matrix matrix =new Matrix();
matrix.preScale(scale, scale);
Bitmap newBM = Bitmap.createBitmap(origin, 0, 0, width, height, matrix, false);
if (newBM.equals(origin)) {
return newBM;
}
origin.recycle();
return newBM;
}
/**
*
* @param bitmap
* @return 从中间截取一个正方形
*/
public static BitmapcropBitmap(Bitmap bitmap) {
// 得到图片的宽，高
int w = bitmap.getWidth();
int h = bitmap.getHeight();
// 裁切后所取的正方形区域边长
int cropWidth = w >= h ? h : w;
return Bitmap.createBitmap(bitmap, 0,
0, cropWidth, cropWidth);
}
/**
*
* @param bitmap
* @param sx 2
* @param sy 3
* @return 返回一个截取的图形
*/
public static BitmapcropBitmap(Bitmap bitmap,int sx,int sy) {
// 得到图片的宽，高
int w = bitmap.getWidth();//600 900
int h = bitmap.getHeight();//900 600
int startWidth=0;
int startHeight=0;
int x=0;
int y=0;
int z=0;
// 裁切后所取的正方形区域边长
if (sx==sy) {
x = w >= h ? h : w;
y=x;
}else if (sx>sy){
//横 长方型
if (w>h){//331:240 3:2
z=h/sx;
}else {//240:331 3:2
z=x/sx;
}
x=sx*z;
y=sy*z;
}else {
//竖型 长方型
if (w>h){//331:240 2:3
z=h/sy;
}else {//240:331 2:3
z=x/sy;
}
x=sx*z;
y=sy*z;
}
return Bitmap.createBitmap(bitmap, startWidth,
startHeight, x, y);
}
/**
*
* @param bitmap
* @return 把图片裁剪成圆形
*/
public static BitmapgetCircleBitmap(Bitmap bitmap) {
if (bitmap ==null) {
return null;
}
//裁剪成正方形
bitmap =cropBitmap(bitmap);
try {
Bitmap circleBitmap = Bitmap.createBitmap(bitmap.getWidth(),
bitmap.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas =new Canvas(circleBitmap);
final Paint paint =new Paint();
final Rect rect =new Rect(0, 0, bitmap.getWidth(),
bitmap.getHeight());
final RectF rectF =new RectF(new Rect(0, 0, bitmap.getWidth(),
bitmap.getHeight()));
float roundPx =0.0f;
roundPx = bitmap.getWidth();
paint.setAntiAlias(true);
canvas.drawARGB(0, 0, 0, 0);
paint.setColor(Color.WHITE);
canvas.drawRoundRect(rectF, roundPx, roundPx, paint);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));
final Rect src =new Rect(0, 0, bitmap.getWidth(),
bitmap.getHeight());
canvas.drawBitmap(bitmap, src, rect, paint);
return circleBitmap;
}catch (Exception e) {
return bitmap;
}
}
public static BitmapdrawableToBitmap(Drawable drawable) {
// 取 drawable 的长宽
int w = drawable.getIntrinsicWidth();
int h = drawable.getIntrinsicHeight();
// 取 drawable 的颜色格式
Bitmap.Config config = drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565;
// 建立对应bitmap
Bitmap bitmap = Bitmap.createBitmap(w, h, config);
// 建立对应 bitmap 的画布
Canvas canvas =new Canvas(bitmap);
drawable.setBounds(0, 0, w, h);
// 把 drawable 内容画到画布中
drawable.draw(canvas);
return bitmap;
}
}
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