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数据存储

admin 11月 13, 2020 0

文件存储:

openFileOutput(“filename”,Context.MODE_PRIVATE/MODE_APPEND):

MODE_PRIVATE会覆盖同名文件,APPEND若文件存在会在文件中追加内容。
返回为FileOutputStream对象

 public void save() {
    String data = "Data to save";
    FileOutputStream out = null;
    BufferedWriter writer = null;
    try {
        out = openFileOutput("data", Context.MODE_PRIVATE);
        writer = new BufferedWriter(new OutputStreamWriter(out));
        writer.write(data);
    } catch (IOException e) {
        e.printStackTrace();
    } finally {
        try {
            if (writer != null) {
                writer.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

openFileInput(“filename”)

返回一个FileInputStream对象

SharedPreferences存储

存储

Context类中的getSharedPreferences()方法
Activity类中的getPreferences()方法

PreferenceManager类中的getDefaultSharedPreferences()方法

SharedPreferences.Editor editor = getSharedPreferences("data",
                    MODE_PRIVATE).edit();
                editor.putString("name", "Tom");
                editor.putInt("age", 28);
                editor.putBoolean("married", false);
                editor.apply();

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