java - 在内部存储中创建新文件异常 : java. io.IOException:打开失败:ENOENT(没有这样的文件或目录)

Question

我正在尝试在 Android 设备的内部存储中创建新文件，但出现没有这样的文件或目录的异常

这是我的代码:-

String APP_PATH_SD_CARD = "/XYZ/";
String APP_THUMBNAIL_PATH_SD_CARD = "Demodir";
String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() + APP_PATH_SD_CARD + APP_THUMBNAIL_PATH_SD_CARD;
File myFile,dir;

try {
        dir = new File(fullPath);
        if (!dir.exists()) {
            dir.mkdir();
        }
        myFile = new File(fullPath, "Vitals.txt");
        if (myFile.exists()) {
            myFile.delete();
            myFile.createNewFile();
        } else {
            myFile.createNewFile();
        }

        Toast.makeText(getBaseContext(),"File 'Vitals.txt' Created",Toast.LENGTH_SHORT).show();
    } catch (Exception e) {
        Toast.makeText(getBaseContext(), e.getMessage(),Toast.LENGTH_SHORT).show();
    }

安卓 list .xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_INTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />

Answer 1

使用 File.seprator 代替斜杠 '\' 或 '/' 以获得更好的性能。

喜欢，

String APP_PATH_SD_CARD = "XYZ";
String APP_THUMBNAIL_PATH_SD_CARD = "Demodir";

String fullPath = Environment.getExternalStorageDirectory().getAbsolutePath() 
+ File.seprator+APP_PATH_SD_CARD+File.seprator+APP_THUMBNAIL_PATH_SD_CARD;