Question

我正在尝试重新调整图像大小，该部分已完成。然后我试图将exif标签复制到新文件。我使用ExifInterface来读取标签。我知道这是一个界面而不是一个对象。但是当我尝试将它用于真正大尺寸的图像时，我得到了NullPointerException。我得到的错误不是所有的图像。

07-25 11:59:23.870: WARN/System.err(1362): java.lang.NullPointerException
07-25 11:59:23.870: WARN/System.err(1362):     at android.media.ExifInterface.saveAttributes(ExifInterface.java:202)

我该如何解决？

复制exif信息的代码

try {
    // copy paste exif information from original file to new
    // file
    ExifInterface oldexif = new ExifInterface(filePath);
    ExifInterface newexif = new ExifInterface(file.getPath());

    int build = Build.VERSION.SDK_INT;

    // From API 11
    if (build >= 11) {
        newexif.setAttribute("FNumber",
                oldexif.getAttribute("FNumber"));
        newexif.setAttribute("ExposureTime",
                oldexif.getAttribute("ExposureTime"));
        newexif.setAttribute("ISOSpeedRatings",
                oldexif.getAttribute("ISOSpeedRatings"));
    }
    // From API 9
    if (build >= 9) {
        newexif.setAttribute("GPSAltitude",
                oldexif.getAttribute("GPSAltitude"));
        newexif.setAttribute("GPSAltitudeRef",
                oldexif.getAttribute("GPSAltitudeRef"));
    }
    // From API 8
    if (build >= 8) {
        newexif.setAttribute("FocalLength",
                oldexif.getAttribute("FocalLength"));
        newexif.setAttribute("GPSDateStamp",
                oldexif.getAttribute("GPSDateStamp"));
        newexif.setAttribute("GPSProcessingMethod",
                oldexif.getAttribute("GPSProcessingMethod"));
        newexif.setAttribute("GPSTimeStamp",
                oldexif.getAttribute("GPSTimeStamp"));
    }
    newexif.setAttribute("DateTime",
            oldexif.getAttribute("DateTime"));
    newexif.setAttribute("Flash", oldexif.getAttribute("Flash"));
    newexif.setAttribute("GPSLatitude",
            oldexif.getAttribute("GPSLatitude"));
    newexif.setAttribute("GPSLatitudeRef",
            oldexif.getAttribute("GPSLatitudeRef"));
    newexif.setAttribute("GPSLongitude",
            oldexif.getAttribute("GPSLongitude"));
    newexif.setAttribute("GPSLongitudeRef",
            oldexif.getAttribute("GPSLongitudeRef"));

    // You need to update this with your new height width
    newexif.setAttribute("ImageLength",
            oldexif.getAttribute("ImageLength"));
    newexif.setAttribute("ImageWidth",
            oldexif.getAttribute("ImageWidth"));

    newexif.setAttribute("Make", oldexif.getAttribute("Make"));
    newexif.setAttribute("Model", oldexif.getAttribute("Model"));
    newexif.setAttribute("Orientation",
            oldexif.getAttribute("Orientation"));
    newexif.setAttribute("WhiteBalance",
            oldexif.getAttribute("WhiteBalance"));

    newexif.saveAttributes();

    Toast.makeText(getApplicationContext(),
            "Image resized & saved successfully",
            Toast.LENGTH_SHORT).show();
} catch (Exception e) {
    e.printStackTrace();
}

其他onFly信息：

当我尝试读取这两个文件时，会创建新文件： enter image description here