java - android java.io.File.fixSlashes(File.java :185)

Question

我在控制台崩溃和错误中遇到错误。有时会出现此错误，我找不到问题所在。

java.lang.NullPointerException
at java.io.File.fixSlashes(File.java:185)
at java.io.File.<init>(File.java:134)

保存图片的函数代码为:

    public static String sharePhoto(Context context, Bitmap bmp) {
    File folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pictures/Folder");
    boolean success = true;
    String file_path = null;
    if (!folder.exists()) {
        success = folder.mkdir();
    }
    if (success) {
            file_path = folder + "/Img_" + System.currentTimeMillis() / 1000 + ".jpg";
        }
        OutputStream os = null;
        try {
            os = new FileOutputStream(file_path);
            bmp.compress(Bitmap.CompressFormat.JPEG, 100, os);
        } catch (IOException e) {
           e.printStackTrace();
        }
    } else {
        // Do something else on failure
    }
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    File f = new File(file_path);
    Uri contentUri = Uri.fromFile(f);
    mediaScanIntent.setData(contentUri);
    context.sendBroadcast(mediaScanIntent);

    return file_path;
}

Answer 1

试试这个:

File folder = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Pictures/MyFolder");

事情是 getExternalStorageDirectory() 返回 File。您需要获取该文件的绝对路径并与 "/Pictures/MyFolder" 连接。