这是我用于将文件.name
写入路径为/sdcard/
的文件夹中的代码,其名称以cimage
开头。目前我有4个这样的文件夹,其中2个是最近创建的。问题在于这两个,并影响我以后手动添加的任何文件夹。写入文件时出现Mysterious IOException
public static void WriteName(ArrayList<String> citem) {
final String not_writable = "norw";
for (int i = 0; i < citem.size(); i++) {
try {
File root = new File(Environment.getExternalStorageDirectory()
.getName() + "/" + citem.get(i));
File namefile = new File(root, ".name");
FileReader namereader = new FileReader(namefile);
BufferedReader in = new BufferedReader(namereader);
String[] str_array = new String[4];
str_array[0] = in.readLine();
str_array[1] = in.readLine();
str_array[2] = in.readLine();
str_array[3] = in.readLine();
Log.d("NameWrite", "line 4: " + str_array[3]);
if (str_array[3] == null || !str_array[3].equals(not_writable)) {
FileWriter namewriter = new FileWriter(namefile);
BufferedWriter out = new BufferedWriter(namewriter);
out.write(i
+ "\nCImage_"
+ (i)
+ "\nAutogenerated Stub\nnorw\n");
out.close();
} else {
Log.d("NameManager.WriteName", "Skipping " + root
+ ", norw set");
}
} catch (IOException e) {
Log.e("NameManager.java : ", ("Error!! Not Writable!!"
+ Environment.getExternalStorageDirectory().getName()
+ "/" + citem.get(i)));
}
}
}
那么会发生什么情况是,当该方法尝试写最后2个文件夹,它抛出一个IOException
。
02-26 05:42:39.663: D/NameManager.java(5316): Checking for whatever
02-26 05:42:39.671: D/NameManager.java(5316): SDcard mounted RW
02-26 05:42:40.694: D/java.lang.java.lang.String(5316): file (43) :cimages
02-26 05:42:40.694: D/java.lang.java.lang.String(5316): file (76) :cimages_1
02-26 05:42:40.694: D/java.lang.java.lang.String(5316): file (77) :cimageslkj
02-26 05:42:40.694: D/java.lang.java.lang.String(5316): file (81) :cimages_2
02-26 05:42:40.694: D/NameWrite(5316): line 4: norw
02-26 05:42:40.694: D/NameManager.WriteName(5316): Skipping sdcard/cimages, norw set
02-26 05:42:40.702: D/NameWrite(5316): line 4: norw
02-26 05:42:40.702: D/NameManager.WriteName(5316): Skipping sdcard/cimages_1, norw set
02-26 05:42:40.702: E/NameManager.java :(5316): Error!! Not Writable!!sdcard/cimageslkj
02-26 05:42:40.710: E/NameManager.java :(5316): Error!! Not Writable!!sdcard/cimages_2
02-26 05:42:40.725: D/java.lang.java.lang.String(5316): file (77) :cimageslkj
我能找到此行为的解释。所有其他应用程序可以写入这些文件夹,以防万一你想知道。什么可能导致这种情况?
检查内部异常。 – 2012-02-26 00:26:58
@TomasVoracek如何做到这一点? – 2012-02-26 00:27:51
使用IOException.printStackTrace,或者只是在调试模式下检查可用的方法/属性。 http://stackoverflow.com/questions/8217500/how-to-print-stacktrace-for-an-exception-android – 2012-02-26 00:30:51