java Android 首选项错误，“字符串无法转换为 int”
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/17844511/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Android Preferences error, "String cannot be cast to int"
提问by Waza_Be
I'm trying to setup a preferences activity but my app keeps crashing and I get the following logcat:
我正在尝试设置一个首选项活动，但我的应用程序不断崩溃，我得到以下 logcat：
FATAL EXCEPTION: main java.lang.RuntimeException: Unable to start activity ComponentInfo{com.appthing.myapp/com.appthing.myapp.Main}: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 07-24 16:37:59.556: E/AndroidRuntime(17384): at android.app.SharedPreferencesImpl.getInt(SharedPreferencesImpl.java:240)
致命异常：main java.lang.RuntimeException：无法启动活动 ComponentInfo{com.appthing.myapp/com.appthing.myapp.Main}：java.lang.ClassCastException：java.lang.String 无法转换为 java.lang。整数
引起：java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Integer 07-24 16:37:59.556: E/AndroidRuntime(17384): at android.app.SharedPreferencesImpl.getInt(SharedPreferencesImpl.爪哇：240）
In my Mainactivity I have the following code inside the onResume()method:
在我的Main活动中，我在onResume()方法中有以下代码：
SeekBar tipSeekBar = (SeekBar) findViewById(R.id.tipSeekBar);
SeekBar splitSeekBar = (SeekBar) findViewById(R.id.splitSeekBar);
SharedPreferences preferences = PreferenceManager
.getDefaultSharedPreferences(this);
tipSeekBar.setProgress(preferences.getInt("defaultTip", 15));
splitSeekBar.setProgress(preferences.getInt("defaultSplit", 1));
tipSeekBar.setMax(preferences.getInt("maxTip", 25));
splitSeekBar.setMax(preferences.getInt("maxSplit", 10));
Here is what I have in the Preference class (as requested):
这是我在 Preference 类中的内容（根据要求）：
addPreferencesFromResource(R.layout.preferences);
// I was told in tutorials this is all I need in the oncreate method
I don't understand why its saying something about a string. All my values are integers and I am using android:inputType="number"to make sure only an int can be entered. I have also tried uninstalling and re-installing the app to clear the cache and nothing works.
我不明白为什么它说的是字符串。我所有的值都是整数，我android:inputType="number"用来确保只能输入一个 int。我还尝试卸载并重新安装该应用程序以清除缓存，但没有任何效果。
RESOLVED:
解决：
"Your Preferences in XML, even if you set android:inputType="number" are still stored as a String"(by Waza_Be).
All I had to do is do Integer.parseInt()to grab the correct value.
“您在 XML 中的首选项，即使您设置 android:inputType="number" 仍然存储为字符串”（由Waza_Be 提供）。我所要做的就是Integer.parseInt()获取正确的值。
回答by Waza_Be
Your Preferences in XML, even if you set android:inputType="number"are still stored as a String
您在 XML 中的首选项，即使您设置android:inputType="number"仍然存储为字符串
You have 2 choices:
您有 2 个选择：
1) the 'not-so-nice': Integer.parseInt( preferences.getString("defaultTip", "15"));
1）“不太好”： Integer.parseInt( preferences.getString("defaultTip", "15"));
2) Using your own type of Integer Preference. More complicated to set in first place but really better (similar question here: https://stackoverflow.com/a/3755608/327402)
2) 使用您自己的整数首选项类型。首先设置更复杂，但确实更好（这里有类似的问题：https: //stackoverflow.com/a/3755608/327402）
回答by Levon Petrosyan
The exception can also be thrown if
也可以抛出异常，如果
- you are using the same
keyfor storing two or more different types ofvalues - at first you stored the value as
Stringand then changed storing and retrieving implementation forintvalue. For this case just clear the cache.
- 您正在使用相同
key的方式存储两种或多种不同类型的values - 首先，您将值存储为
String，然后更改了存储和检索int值的实现。对于这种情况，只需清除缓存即可。
