将文件写入android中的sdcard

Question

我想在SD卡上创建一个文件.在这里我可以创建文件并将其读/写到应用程序,但我想要的是,文件应该保存在SD卡的特定文件夹中.我该怎么做FileOutputStream呢？

// create file
    public void createfile(String name) 
    {
        try
        {
            new FileOutputStream(filename, true).close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    // write to file

    public void appendToFile(String dataAppend, String nameOfFile) throws IOException 
    {
        fosAppend = openFileOutput(nameOfFile, Context.MODE_APPEND);
        fosAppend.write(dataAppend.getBytes());
        fosAppend.write(System.getProperty("line.separator").getBytes());
        fosAppend.flush();
        fosAppend.close();
    }

Answer 1

这是我的代码中的一个例子:

try {
    String filename = "abc.txt";
    File myFile = new File(Environment
            .getExternalStorageDirectory(), filename);
    if (!myFile.exists())
        myFile.createNewFile();
    FileOutputStream fos;
    byte[] data = string.getBytes();
    try {
        fos = new FileOutputStream(myFile);
        fos.write(data);
        fos.flush();
        fos.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }

别忘了:

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

Answer 2

试试这样,

try {
    File newFolder = new File(Environment.getExternalStorageDirectory(), "TestFolder");
    if (!newFolder.exists()) {
        newFolder.mkdir();
    }
    try {
        File file = new File(newFolder, "MyTest" + ".txt");
        file.createNewFile();
    } catch (Exception ex) {
        System.out.println("ex: " + ex);
    }
} catch (Exception e) {
    System.out.println("e: " + e);
}