Question

我的应用程序有2个editText。

我想将EditText中的2个文本保存到sharedpreferences然后加载它，但是当我尝试在保存后加载它时 - app会在每个editText中读取与最后一个EditText相同的文本。

    private static final String PREFERENCES_NAME = "myPreferences";
    private static final String PREFERENCES_NAME2 = "myPreferences";

    private SharedPreferences preferences;
    private SharedPreferences preferences2;

        preferences = getSharedPreferences(PREFERENCES_NAME, Activity.MODE_PRIVATE);
        preferences2 = getSharedPreferences(PREFERENCES_NAME2, Activity.MODE_PRIVATE);


    private void save() {
        SharedPreferences.Editor preferencesEditor = preferences.edit();
        String eTextData = eText.getText().toString();
        preferencesEditor.putString(PREFERENCES_TEXT_FIELD, eTextData);
        preferencesEditor.commit();

        SharedPreferences.Editor preferencesEditor2 = preferences2.edit();
        String eTextData2 = eText2.getText().toString();
        preferencesEditor2.putString(PREFERENCES_TEXT_FIELD2, eTextData1);
        preferencesEditor2.commit();
    }



    private void read() {
        String textFromPreferences = preferences.getString(PREFERENCES_TEXT_FIELD, "");
        eText.setText(textFromPreferences);

        String textFromPreferences2 = preferences2.getString(PREFERENCES_TEXT_FIELD2, "");
        eText2.setText(textFromPreferences2);
    }

我的代码有什么问题？

Answer 1

您的字符串具有相同的值：

private static final String PREFERENCES_NAME = "myPreferences";
private static final String PREFERENCES_NAME2 = "myPreferences";

所以putString会覆盖彼此。此外，您只能为两个字符串使用1个SharedPreferences实例。

Answer 2

您使用的是相同的偏好文件名"myPreferences"。此外，没有必要使用两种不同的偏好，一种就足够了。

private static final String PREFERENCES_NAME = "myPreferences";

private SharedPreferences preferences;

preferences = getSharedPreferences(PREFERENCES_NAME, Activity.MODE_PRIVATE);


private void save() {
    SharedPreferences.Editor preferencesEditor = preferences.edit();
    String eTextData = eText.getText().toString();
    String eTextData2 = eText2.getText().toString();

   //Again, PREFERENCES_TEXT_FIELD and PREFERENCES_TEXT_FIELD2 should be //different

    preferencesEditor.putString(PREFERENCES_TEXT_FIELD, eTextData);
    preferencesEditor.putString(PREFERENCES_TEXT_FIELD2, eTextData2);
    preferencesEditor.commit();
}



private void read() {
    String textFromPreferences = preferences.getString(PREFERENCES_TEXT_FIELD, "");
    eText.setText(textFromPreferences);

    String textFromPreferences2 = preferences.getString(PREFERENCES_TEXT_FIELD2, "");
    eText2.setText(textFromPreferences2);
}

Answer 3

问题可能是您的PREFERENCES_TEXT_FIELD2和PREFERENCES_TEXT_FIELD相等。

此外，通常您不需要SharedPreferences的多个实例，除非您为不同的配置加载。

SharedPreferences不适用于EditText

3 个答案: