文件存储

1.写出文件

    @Override
    protected void onDestroy() {
        super.onDestroy();
        String inputText = editText.getText().toString();
        save(inputText);

    }

    /**
     * Content类的openFileOutput(String a，int b)方法
     * a，创建的文件名称 /data/data/<packagename>/files/默认路径
     * b，操作模式 MODE_PRIVATE同名覆盖 MODE_APPEND存在追加
     * FileOutputStream 返回对象
     */
    public void save( String inputText) {

        BufferedWriter bufferedWriter = null;
        try {
            FileOutputStream out = openFileOutput("data", Context.MODE_PRIVATE);
             bufferedWriter = new BufferedWriter(new OutputStreamWriter(out));
            bufferedWriter.write(inputText);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bufferedWriter != null) {
                try {
                    bufferedWriter.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

    }

2.读入文件

    public String load() {
        StringBuilder content = null;

        try {
            FileInputStream in = openFileInput("data");
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in));
            String line = "";
            while ((line = bufferedReader.readLine()) != null) {
                content = new StringBuilder().append(line);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return content.toString();
    }

SharedPreferences存储

键值对，多数据类型存储

Unit6：持久化

原文：https://www.cnblogs.com/ssy197/p/13674720.html