如何在android的内存中存储文件并通过android手机访问

// 内部存储示例
String fileName = "example.txt";
String fileContent = "Hello, World!";

try {
    File file = new File(getApplicationContext().getFilesDir(), fileName);
    FileOutputStream fos = new FileOutputStream(file);
    fos.write(fileContent.getBytes());
    fos.close();
} catch (IOException e) {
    e.printStackTrace();
}

// 外部存储示例
String fileName = "example.txt";
String fileContent = "Hello, World!";

if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    File dir = new File(Environment.getExternalStorageDirectory(), "MyApp");
    if (!dir.exists()) {
        dir.mkdirs();
    }

    File file = new File(dir, fileName);
    try {
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(fileContent.getBytes());
        fos.close();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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