如何在android中读取临时数据

SharedPreferences sharedPreferences = getSharedPreferences("temp_data", Context.MODE_PRIVATE);
String tempData = sharedPreferences.getString("key", "default_value");

File file = new File(getCacheDir(), "temp_data.txt");
try {
    FileInputStream fis = new FileInputStream(file);
    BufferedReader br = new BufferedReader(new InputStreamReader(fis));
    String tempData = br.readLine();
    br.close();
} catch (IOException e) {
    e.printStackTrace();
}

SQLiteOpenHelper dbHelper = new SQLiteOpenHelper(this, "temp_data.db", null, 1) {
    @Override
    public void onCreate(SQLiteDatabase db) {
        // 创建表格
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 升级表格
    }
};
SQLiteDatabase db = dbHelper.getReadableDatabase();
Cursor cursor = db.query("temp_table", null, null, null, null, null, null);
if (cursor.moveToFirst()) {
    String tempData = cursor.getString(cursor.getColumnIndex("column_name"));
}
cursor.close();
db.close();