Question

我正在创建一个包含表单的应用程序，每当数据单击按钮从EditText中的BD加载时，但每次按下其他按钮时，其他EditText都会被清除，我试过：

@Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
    super.onSaveInstanceState(savedInstanceState);
    savedInstanceState.putString("data", myVariable);
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
   super.onRestoreInstanceState(savedInstanceState);
   other = savedInstanceState.getString("data");
   name.setText(other);

}

很抱歉，如果我没有解释清楚，我需要每次更改活动变量而我没有删除。有什么建议？谢谢！

Answer 1

尝试使用Android SharedPreferences。这是Android为其应用提供的持久键值存储，旨在涵盖此类问题。这是使用它的简单方法：

SharedPreference prefs = PreferenceManager.getDefaultSharedPreferences(this);

// To put a data (in this case a String from your EditText)..
Editor editor = prefs.edit();
editor.putString("data", yourStringHere);
editor.commit();

...

// ..and to retrieve it..
prefs.getString("data", null);

// NOTE: The 'null' in above method call could be replaced by any String you want;
// it basically specifies a default value to get when "data" is empty or doesn't 
// yet exist.

希望这有帮助。

变量需要保存

1 个答案: