如何将位图图像保存到我在 android 中的画廊文件夹中？

Question

这是我保存图像的代码。我还提到了我要保存图像的文件夹名称，因此它将在画廊中，但它不起作用我的图像被保存在默认的“图片”文件夹中。当我调试时，它显示

java.io.FileNotFoundException：/storage/emulated/0/MyFolderName/aaa-13:15:44/1-4-2016.jpg：打开失败：ENOENT（没有这样的文件或目录） em>

异常。在执行第一行 try 块后，它会去 catch 文件夹。

请帮忙，我错过了什么？？？？

提前谢谢你...

    public void saveImage(Bitmap bitmap){
    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/MyFolderName"); //my folder name where I want to save.
    String receiverN = receiverName.getText().toString();

    myDir.mkdirs();
    Calendar c = Calendar.getInstance();
    String month, day, year, hour, minute, second;
    month = ""+ (c.get(Calendar.MONTH)+1);
    day = "" + c.get(Calendar.DAY_OF_MONTH);
    year = "" + c.get(Calendar.YEAR);
    hour = ""+c.get(Calendar.HOUR_OF_DAY);
    minute = "" + c.get(Calendar.MINUTE);
    int seconds = c.get(Calendar.SECOND);
    if (seconds<10) second = "0"+ seconds;
    else second = ""+seconds;

    String fname = receiverN + "-" + hour + ":" + minute + ":" + second + "/"  + month + "-" + day + "-" + year +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete ();
    try {
        FileOutputStream out = new FileOutputStream(file); //from here it goes to catch block
        bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
        out.flush();
        out.close();
        String[] paths = {file.toString()};
        String[] mimeTypes = {"/image/jpeg"};
        MediaScannerConnection.scanFile(this, paths, mimeTypes, null);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

有几件事可以尝试。

使用File.separator 作为/ 字符。

不要将外部存储目录转换为字符串，而是在File构造函数中使用它。

File myDir = new File( Environment.getExternalStorageDirectory(),File.separator+"MyFolderName");

您的实际文件名中包含/。我会使用以下内容删除该字符以及可能导致文件名出现问题的任何其他字符。

public static String encodeString(String string) {

        if (string != null) {
            string = string.replace("/","-");
            string = string.replace(" ","_");
            string = string.replace(":", "-");
            string = string.replace("&", "-");
        }
        return string;
    }