Android 旋转后如何保存图像位图？

我开发了一个将图像保存到sd卡的应用程序，所有的图片都是向上的，我想旋转它们并将它们保存在我选择的旋转位置。 我知道如何在代码上旋转，但图像不会永久保存。 这是我的密码： //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);  
}

//调整图像大小

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);
    }
}

---

谢谢你的帮助：）

你也可以试试这个

return Bitmap.createBitmap(source, 0, 0, source.getWidth(),source.getHeight(), matrix, true);  

通过这个链接

---

您需要重新保存位图

try {
       File dir = new File("path/to/directory");
       if(!dir.exists())
           dir.mkdirs();
       File file = new File(dir, "original_img_name.png");
       FileOutputStream out;
       out = new FileOutputStream(file);
       bmp.compress(Bitmap.CompressFormat.PNG, 90, out);
} catch (Exception e) {
    e.printStackTrace();
} finally {
       try{
           out.close();
       } catch(Throwable ignore) {}
}

编辑1：

替换

bmp.compress（Bitmap.CompressFormat.PNG，90，out）带有
resizedBitmap.compress（Bitmap.CompressFormat.JPEG，80，out）
并为目录路径和映像名称设置正确的值。如果要替换以前的图像，请使用原始路径和图像名称

另外，请确保您包含以下权限

以下代码可以帮助您压缩位图并调整其大小

注:
创建一个名为photoPath的字符串类型变量，并将照片url存储在其中

public void compressImage(){
    Log.i("compressPhoto", "Compress and resize photo started.");

    // Getting Image
    InputStream in = null;
    try {
        in = new FileInputStream(photoPath);
    } catch (FileNotFoundException e) {
        Log.e("TAG","originalFilePath is not valid", e);
    }

    BitmapFactory.Options options = new BitmapFactory.Options();
    Bitmap bitmap = BitmapFactory.decodeStream(in, null, options);
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap = bitmap.createScaledBitmap(bitmap,(int)(bitmap.getWidth()*0.2), (int)(bitmap.getHeight()*0.2), true);
    bitmap.compress(Bitmap.CompressFormat.JPEG, 50, stream);

    byte[] byteArray = stream.toByteArray();

    // Storing Back
    FileOutputStream outStream = null;
    try {
        outStream = new FileOutputStream(photoPath);
        outStream.write(byteArray);
        outStream.close();
    } catch (Exception e) {
        Log.e("TAG","could not save", e);
    }

}

试试这个：saveBitmap=rotate（位图，40.00）。。。和saveBitmap.compress（Bitmap.CompressFormat.JPEG，90，out）；//然后保存到文件查看我的ans：我编辑了我的问题，如何将其与调整大小的方法相结合？我编辑了我的问题，如何将其与调整大小的方法相结合？请选中答案中的“编辑1”。