<span style="font-size:18px;">1.权限添加<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>public static String getDataFolderPath(Context paramContext) {
        return Environment.getDataDirectory() + "/data/"
                + paramContext.getPackageName() + "/files";
    }

    public static String getMyFileDir(Context context){
        return context.getFilesDir().toString();
    }
    
    public static String getMyCacheDir(Context context){
        return context.getCacheDir().toString();
    }
    /**
     * @desc 保存内容到文件中
     * @param fileName
     * @param content
     * @throws Exception
     */
    public static void save(Context context, String fileName, String content, int module) {
        try {
            FileOutputStream os = context.openFileOutput(fileName, module);
            os.write(content.getBytes());
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    
    /**
     * @desc 读取文件内容
     * @param fileName
     * @return
     */
    public static String read(Context context, String fileName){
        
        try {
            FileInputStream fis = context.openFileInput(fileName);
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            byte[] b = new byte[1024];
            int len = 0;
            while((len = fis.read(b)) != -1){
                bos.write(b, 0, len);
            }
            byte[] data = http://www.mamicode.com/bos.toByteArray();>

android 文件保存到应用和sd卡中