Android -- 重置Bitmap大小&&Bitmap转角度

重置Bitmap大小                                                                          

Bitmap bitMap = BitmapFactory.decodeFile(path);

int width = bitMap.getWidth();

int height = bitMap.getHeight();

// 设置想要的大小

int newWidth = 500;

int newHeight = 400;

// 计算缩放比例

float scaleWidth = ((float) newWidth) / width;

float scaleHeight = ((float) newHeight) / height;

// 取得想要缩放的matrix参数

Matrix matrix = new Matrix();

matrix.postScale(scaleWidth, scaleHeight);

// 得到新的图片

 bitMap = Bitmap.createBitmap(bitMap, 0, 0, width, height, matrix, true);

Bitmap转角度                                                                            

Bitmap bm = BitmapFactory.decodeByteArray(imgdata, 0,imgdata.length);

Matrix matrix = new Matrix();

matrix.preRotate(270);

bm = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(),bm.getHeight(), matrix, true);

imgdata为camera开发的时候的图片数据。

这里其实找到了bitmap就OK了。

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