在imageview中使用时从相机或图库拍摄的照片,其方向发生变化,有时在Android中垂直拉伸

概述在我的应用程序中,我必须从相机捕获图像或从库中导入,在活动中的imageview中显示它.一切都很好,我从两者都获得图像,并能够毫无例外地在imageview上设置它.但有时图像不能正确缩放并垂直拉伸或方向改变.请帮帮我.这是我的代码解码从官方Android文档引用的图像：publicstaticBitm

在我的应用程序中,我必须从相机捕获图像或从库中导入,在活动中的imagevIEw中显示它.一切都很好,我从两者都获得图像,并能够毫无例外地在imagevIEw上设置它.但有时图像不能正确缩放并垂直拉伸或方向改变.请帮帮我.

这是我的代码解码从官方Android文档引用的图像：

public static Bitmap decodeSampledBitmapFromresource(file photofile, int reqWIDth, int reqHeight) {    // First decode with inJustDecodeBounds=true to check dimensions    final BitmapFactory.Options options = new BitmapFactory.Options();    options.inJustDecodeBounds = true;    try {        BitmapFactory.decodeStream(new fileinputStream(photofile), null,                options);        // Calculate inSampleSize        options.inSampleSize = calculateInSampleSize(options, reqWIDth,                reqHeight);        // Decode bitmap with inSampleSize set        options.inJustDecodeBounds = false;        return BitmapFactory.decodeStream(new fileinputStream(photofile),                null, options);    } catch (fileNotFoundException e) {        // Todo auto-generated catch block        e.printstacktrace();        return null;    }}public static int calculateInSampleSize(BitmapFactory.Options options,        int reqWIDth, int reqHeight) {    // Raw height and wIDth of image    final int height = options.outHeight;    final int wIDth = options.outWIDth;    int inSampleSize = 1;    if (height > reqHeight || wIDth > reqWIDth) {        // Calculate ratios of height and wIDth to requested height and        // wIDth        final int heightRatio = Math.round((float) height                / (float) reqHeight);        final int wIDthRatio = Math.round((float) wIDth / (float) reqWIDth);        // Choose the smallest ratio as inSampleSize value, this will        // guarantee        // a final image with both dimensions larger than or equal to the        // requested height and wIDth.        inSampleSize = heightRatio < wIDthRatio ? heightRatio : wIDthRatio;    }    return inSampleSize;}

解决方法:

图像具有不同的方向,因此在进行imagevIEw时它会根据方向旋转.您可以从图像属性检查照片的方向.
要以正确的方式设置图像,您可以使用以下代码…

     int rot=getCameraPhotoOrIEntation(this,Uri,picturePath);         if(rot!=0)         bitmap=new RotateOrIEntation().RotateOrIEntationCall(bitmap,rot);

getCameraPhotoOrIEntation方法： –

 public static int getCameraPhotoOrIEntation(Context context, Uri imageUri, String imagePath){     int rotate = 0;     try {         context.getContentResolver().notifyChange(imageUri, null);         file imagefile = new file(imagePath);         ExifInterface exif = new ExifInterface(                 imagefile.getabsolutePath());         int orIEntation = exif.getAttributeInt(                 ExifInterface.TAG_ORIENTATION,                 ExifInterface.ORIENTATION_norMAL);         switch (orIEntation) {         case ExifInterface.ORIENTATION_ROTATE_270:             rotate = 270;             break;         case ExifInterface.ORIENTATION_ROTATE_180:             rotate = 180;             break;         case ExifInterface.ORIENTATION_ROTATE_90:             rotate = 90;             break;         }         Log.d(TAG, "Exit orIEntation: " + orIEntation);     } catch (Exception e) {         e.printstacktrace();     }    return rotate; }

添加RotateOrIEntation类以根据方向旋转类.

 public class RotateOrIEntation  {Bitmap RotateOrIEntationCall(Bitmap src,float degree)        {        Matrix matrix=new Matrix();        matrix.postRotate(degree);       Bitmap bmOut = Bitmap.createBitmap(src, 0, 0, src.getWIDth(), src.getHeight(), matrix, true);      return bmOut;      }          }

总结

以上是内存溢出为你收集整理的在imageview中使用时从相机或图库拍摄的照片,其方向发生变化,有时在Android中垂直拉伸全部内容，希望文章能够帮你解决在imageview中使用时从相机或图库拍摄的照片,其方向发生变化,有时在Android中垂直拉伸所遇到的程序开发问题。

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