Android java.io.ioexception：打开失败：将图像保存到外部存储时的einval（无效参数）
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/11394616/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
java.io.ioexception: open failed: einval (Invalid argument) when saving a image to external storage
提问by Charlie-Blake
This is my code:
这是我的代码：
private boolean writeToSD(Bitmap bm, String url) {
if (canIWriteOnSD()) {
File sd = Environment.getExternalStorageDirectory();
File dest = new File(sd, "MoveInBlue/");
try {
url = urlCleaner(url);
if (!dest.exists()) {
dest.mkdir();
}
File file = new File(dest, url + ".png");
if (!file.exists()) {
file.createNewFile();
}
FileOutputStream out = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 90, out);
out.flush();
out.close();
return true;
} catch (Exception e) {
e.printStackTrace();
// Do nothing
}
}
return false;
}
PROBLEM SOLVED:
问题解决了：
urlCleaner now returns url.substring(url.lastIndexOf('?')+1), and everything works as intended.
urlCleaner 现在返回 url.substring(url.lastIndexOf('?')+1)，一切都按预期工作。
The exception is actually thrown at file.createNewFile();and I don't really know why.
实际上抛出了异常，file.createNewFile();我真的不知道为什么。
Thank you very much.
非常感谢。
(urlCleaner just removes the http://... from the url and leaves the php tags)
（urlCleaner 只是从 url 中删除了 http://... 并留下了 php 标签）
Here's the LogCat:
这是 LogCat：
07-09 13:57:13.479: W/System.err(5715): java.io.IOException: open failed: EINVAL (Invalid argument)
07-09 13:57:13.479: W/System.err(5715): at java.io.File.createNewFile(File.java:940)
07-09 13:57:13.479: W/System.err(5715): at com.moveinblue.planner.asynctask.ImageDownloader.writeToSD(ImageDownloader.java:459)
07-09 13:57:13.479: W/System.err(5715): at com.moveinblue.planner.asynctask.ImageDownloader.access(ImageDownloader.java:448)
07-09 13:57:13.479: W/System.err(5715): at com.moveinblue.planner.asynctask.ImageDownloader$BitmapDownloaderTask.onPostExecute(ImageDownloader.java:270)
07-09 13:57:13.479: W/System.err(5715): at com.moveinblue.planner.asynctask.ImageDownloader$BitmapDownloaderTask.onPostExecute(ImageDownloader.java:1)
07-09 13:57:13.479: W/System.err(5715): at android.os.AsyncTask.finish(AsyncTask.java:602)
07-09 13:57:13.479: W/System.err(5715): at android.os.AsyncTask.access0(AsyncTask.java:156)
07-09 13:57:13.479: W/System.err(5715): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
07-09 13:57:13.479: W/System.err(5715): at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 13:57:13.479: W/System.err(5715): at android.os.Looper.loop(Looper.java:137)
07-09 13:57:13.479: W/System.err(5715): at android.app.ActivityThread.main(ActivityThread.java:4575)
07-09 13:57:13.489: W/System.err(5715): at java.lang.reflect.Method.invokeNative(Native Method)
07-09 13:57:13.489: W/System.err(5715): at java.lang.reflect.Method.invoke(Method.java:511)
07-09 13:57:13.489: W/System.err(5715): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
07-09 13:57:13.489: W/System.err(5715): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
07-09 13:57:13.489: W/System.err(5715): at dalvik.system.NativeStart.main(Native Method)
07-09 13:57:13.489: W/System.err(5715): Caused by: libcore.io.ErrnoException: open failed: EINVAL (Invalid argument)
07-09 13:57:13.489: W/System.err(5715): at libcore.io.Posix.open(Native Method)
07-09 13:57:13.489: W/System.err(5715): at libcore.io.BlockGuardOs.open(BlockGuardOs.java:110)
07-09 13:57:13.489: W/System.err(5715): at java.io.File.createNewFile(File.java:933)
07-09 13:57:13.489: W/System.err(5715): ... 15 more
回答by David Wasser
The string urlcontains illegal characters for a filename. You'll need to cleanup the filename by removing the illegal characters.
该字符串url包含文件名的非法字符。您需要通过删除非法字符来清理文件名。
回答by Alejandra
Really tricky error since Android 28 works just fine when trying to write a filename with ? or : in the name, but Android 22 for instance would blow up. Just run a couple of replacements in the filename like:
非常棘手的错误，因为 Android 28 在尝试使用 ? 或 : 在名称中，但例如 Android 22 会爆炸。只需在文件名中运行几个替换，例如：
File(filename.replace(":", "").replace("?", "") [...])
and then you're good to run
然后你就可以跑了
file.createNewFile()
