Java createNewFile - 打开失败：ENOENT（没有那个文件或目录）
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createNewFile - open failed: ENOENT (No such file or directory)
提问by user3425269
I can't figure out what's going wrong here...I've tried writing this more succicinctly, that didn't work. I put in all the extra strings after reading other suggestions with this problem. Not helping. No clue what's happening. Could it be permissions-related? AFAIK I'm trying to write to internal memory and that doesn't need special permissions?
我不知道这里出了什么问题……我试过写得更简洁，但没用。在阅读了有关此问题的其他建议后，我输入了所有额外的字符串。没有帮助。不知道发生了什么。会不会是权限相关的？AFAIK 我正在尝试写入内部存储器并且不需要特殊权限？
public void outputBitmap(){
String path = Environment.DIRECTORY_PICTURES.toString();
File folder = new File(path + "/Blabla");
String filename = new SimpleDateFormat("yyMMddHHmmss").format(Calendar.getInstance().getTime()) + ".png";
try {
if (!folder.exists()) {
folder.mkdirs();
System.out.println("Making dirs");
}
File myFile = new File(folder.getAbsolutePath(), filename);
myFile.createNewFile();
FileOutputStream out = new FileOutputStream(myFile);
myBitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
out.flush();
out.close();
} catch (Exception e) {
System.out.println(e.getMessage());
e.printStackTrace();
}
}
It goes "Making dirs" every time, the directory is not staying made, or something. When it gets to myFile.createNewFile(); it gives the error message "open failed: ENOENT (No such file or directory)"
每次都会“制作目录”，目录没有保持制作状态，或者什么的。当它到达 myFile.createNewFile(); 它给出了错误消息“打开失败：ENOENT（没有这样的文件或目录）”
Not sure if it's related, but the information I am trying to output is from:
不确定它是否相关，但我试图输出的信息来自：
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
myBitmap = Bitmap.createBitmap(viewWidth, viewHeight, Bitmap.Config.RGB_565);
Canvas pngCanvas = new Canvas(myBitmap);
...[some maths and stuff]
canvas.drawLine(...);
pngCanvas.drawLine(...);
}
I thought I should be able to use the same canvas for the bitmap, but that caused crashed, so I'm writing the same information to both canvases. So...I don't know if that's related to the issue or a totally different bad issue or what.
我认为我应该能够为位图使用相同的画布，但这导致崩溃，所以我将相同的信息写入两个画布。所以...我不知道这是否与问题有关，还是一个完全不同的坏问题或什么。
Been searching all kinds of questions that seemed similar, but couldn't find any solutions that worked for me. I've been trying to solve this for days now. Anyone know what's going wrong?
一直在搜索各种看起来相似的问题，但找不到任何对我有用的解决方案。这几天我一直在努力解决这个问题。有谁知道出了什么问题？
Thanks
谢谢
采纳答案by Hakan Serce
You are not using Environment.DIRECTORY_PICTURES correctly. It is not a folder by itself, you need to use it as a parameter to getExternalStoragePublicDirectory() method. Check here : http://developer.android.com/reference/android/os/Environment.html#getExternalStoragePublicDirectory(java.lang.String)
您没有正确使用 Environment.DIRECTORY_PICTURES。它本身不是一个文件夹，您需要将其用作 getExternalStoragePublicDirectory() 方法的参数。在这里检查：http: //developer.android.com/reference/android/os/Environment.html#getExternalStoragePublicDirectory(java.lang.String)
回答by Farhan
Possible Issue:
可能的问题：
Make sure you have given following required permission in your manifest file.
确保您已在清单文件中授予以下所需权限。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
And for Marhsmallow devices, make sure Contacts Groups Permissions is granted too by device user.
Ref: http://developer.android.com/training/permissions/requesting.html
对于 Marhsmallow 设备，请确保设备用户也授予联系人组权限。
参考：http: //developer.android.com/training/permissions/requesting.html
回答by Marcelo Gumiero
Just change the begining of your code from this:
只需从此更改代码的开头：
public void outputBitmap(){
String path = Environment.DIRECTORY_PICTURES.toString();
File folder = new File(path + "/Blabla");
To this:
对此：
public void outputBitmap(){File folder = new File(getActivity().getExternalFilesDir(null) + IMAGE_DIRECTORY + "whatever you want for your directory name");
