Android แสดงรูปใน ImagesView ยังไงครับ ให้มันแสดงรูปไม่กลับหัวกลับหางครับ

Matrix matrix=new Matrix();
imageView.setScaleType(ScaleType.MATRIX);   //required
matrix.postRotate((float) angle, pivX, pivY);
imageView.setImageMatrix(matrix);

Matrix matrix=new Matrix();
		imageView.setScaleType(ScaleType.MATRIX);   //required
		//matrix.postRotate((float) angle, pivX, pivY);
		matrix.postRotate(90f, imageView.getDrawable().getBounds().width()/2, imageView.getDrawable().getBounds().height()/2);
		imageView.setImageMatrix(matrix);

int orientation;
                    ExifInterface exif;
                    Matrix m=new Matrix();
                    try 
                    {
    					exif = new ExifInterface(f.getAbsolutePath());
    					orientation=exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_NORMAL); 					

    					if(orientation == 3)
    					{
    						m.postRotate(180);
    					}
    					else if(orientation==6)
    					{  
    						m.postRotate(90);
    					}
    					
    					else if(orientation == 8)
    					{
    						m.postRotate(270);
    				    }
    					exif.saveAttributes();
    				} 
                    catch (IOException e) 
    				{
    					e.printStackTrace();
    				}