请帮帮我！如何让应用保存用户在edittext中写的内容？

SharedPreferences.Editor editor = getSharedPreferences("MyPrefs", MODE_PRIVATE).edit();
editor.putString("user_input", editText.getText().toString());
editor.apply();

SharedPreferences prefs = getSharedPreferences("MyPrefs", MODE_PRIVATE);
String userInput = prefs.getString("user_input", "");

// 创建数据库
SQLiteDatabase db = openOrCreateDatabase("MyDatabase", MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS userInput (id INTEGER PRIMARY KEY AUTOINCREMENT, content TEXT)");

// 插入数据
String userInput = editText.getText().toString();
String sql = "INSERT INTO userInput (content) VALUES ('" + userInput + "')";
db.execSQL(sql);

String sql = "SELECT content FROM userInput";
Cursor cursor = db.rawQuery(sql, null);
if (cursor.moveToFirst()) {
    String userInput = cursor.getString(0);
}
cursor.close();

String userInput = editText.getText().toString();
FileOutputStream fos = openFileOutput("user_input.txt", MODE_PRIVATE);
fos.write(userInput.getBytes());
fos.close();

FileInputStream fis = openFileInput("user_input.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(fis));
String userInput = reader.readLine();
reader.close();