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我开发了将图像保存到 SD 卡的应用程序，并且所有图片都在上面我想旋转它们并将它们保存在我选择的旋转位置。 我知道如何旋转我的代码，但图像不会永久保存。 这是我的代码: //旋转图片
public static Bitmap rotate(Bitmap source, float angle) {
Matrix matrix = new Matrix();
matrix.postRotate(angle);
return Bitmap.createBitmap(source, 0, 0, source.getWidth(),source.getHeight(), matrix, false);
}
//调整图片大小
public void resizeImage(String path , int Wdist,int Hdist){
try
{
int inWidth = 0;
int inHeight = 0;
InputStream in = new FileInputStream(path);
// decode image size (decode metadata only, not the whole image)
BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeStream(in, null, options);
in.close();
in = null;
// save width and height
inWidth = options.outWidth;
inHeight = options.outHeight;
// decode full image pre-resized
in = new FileInputStream(path);
options = new BitmapFactory.Options();
// calc rought re-size (this is no exact resize)
options.inSampleSize = Math.max(inWidth/Wdist, inHeight/Hdist);
// decode full image
Bitmap roughBitmap = BitmapFactory.decodeStream(in, null, options);
// calc exact destination size
Matrix m = new Matrix();
RectF inRect = new RectF(0, 0, roughBitmap.getWidth(), roughBitmap.getHeight());
RectF outRect = new RectF(0, 0, Wdist, Hdist);
m.setRectToRect(inRect, outRect, Matrix.ScaleToFit.CENTER);
float[] values = new float[9];
m.getValues(values);
// resize bitmap
Bitmap resizedBitmap = Bitmap.createScaledBitmap(roughBitmap, (int) (roughBitmap.getWidth() * values[0]), (int) (roughBitmap.getHeight() * values[4]), true);
// save image
try
{
FileOutputStream out = new FileOutputStream(path);
resizedBitmap.compress(Bitmap.CompressFormat.JPEG, 80, out);
}
catch (Exception e)
{
Log.e("Image", e.getMessage(), e);
}
}
catch (IOException e)
{
Log.e("Image", e.getMessage(), e);
}
}
感谢帮助者:)