Android中保存文件到内部存储器

    public static void saveDataToPrivateFile(Context context, String data, int mode, String fileName) {
        FileOutputStream fileOutputStream = null;
        BufferedWriter bufferedWriter = null;

        try {
            fileOutputStream = context.openFileOutput(fileName, mode);
            bufferedWriter = new BufferedWriter(new OutputStreamWriter(fileOutputStream));
            bufferedWriter.write(data);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (bufferedWriter != null) {
                    bufferedWriter.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static String loadDataFromPrivateFile(Context context, String fileName) {
        FileInputStream fileInputStream = null;
        BufferedReader bufferedReader = null;
        StringBuilder stringBuilder = new StringBuilder();

        try {
            fileInputStream = context.openFileInput(fileName);
            bufferedReader = new BufferedReader(new InputStreamReader(fileInputStream));
            String result = "";
            while ((result = bufferedReader.readLine()) != null) {
                stringBuilder.append(result);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        return stringBuilder.toString();
    }

    public static boolean deletePrivateFile(Context context, String fileName) {
        try {
            return context.deleteFile(fileName);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }