java - 在 Android 中将文件写入 SDcard

Question

我一直在寻找这个问题。它实际上适用于旧版本的 android，但在我更新 SDK 后，出现错误。错误信息是“open filed: ENOTDIR (Not a directory):/sdcard/PlayNumbers/mysdfile.xml”请有人指出我做错了什么？我的代码如下。

非常感谢，

path=new File("/sdcard/PlayNumbers");
myFile = new File(path,"mysdfile.xml");
if (!path.exists()) {
    path.mkdirs();
}
if(!myFile.exists()){
    myFile.createNewFile();
}

FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);

myOutWriter.append("test");
myOutWriter.close();
fOut.close();

==>

File path = null;
File myFile = null;
String filePath = Environment.getExternalStorageDirectory().toString();
path=new File(filePath+"/PlayNumbers/");
myFile = new File(path,"mysdfile.xml");

//i also tried both as below
//path=new File(filePath+"/PlayNumbers");
//myFile = new File(path,"mysdfile.xml");

if (!path.exists()) {
    path.mkdirs();
}
if(!myFile.exists()){
    myFile.createNewFile();
}
FileOutputStream fOut = new FileOutputStream(myFile);
OutputStreamWriter myOutWriter = new OutputStreamWriter(fOut);
myOutWriter.append("test");
myOutWriter.close();
fOut.close();

附注好的，我已经像你们提到的那样改变了我的代码，但它仍然给我同样的错误，它不是目录......知道吗？？？

Answer 1

这应该有效，假设您在 list 中拥有正确的权限:

File externalStorageDir = Environment.getExternalStorageDirectory();
File playNumbersDir = new File(externalStorageDir, "PlayNumbers");
File myFile = new File(playNumbersDir, "mysdfile.xml");

if (!playNumbersDir.exists()) {
    playNumbersDir.mkdirs();
}
if(!myFile.exists()){
    myFile.createNewFile();
}