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android - Saving the spinner position or value using Shared Preference

问题描述

I am in my Fragment class which has spinner that contains locales..for text to speech

    mylocale = localeList.get(position);
    textToSpeech.setLanguage(mylocale);
    spinnerposition = Integer.valueOf(String.valueOf(localeList.get(position)));

i want to save the position using sharedpreferences this is what i am trying: 

 public void savepos(){
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
    SharedPreferences.Editor editor = sharedPreferences.edit();
    editor.putInt(POSITION , spinnerposition);
    editor.apply();
}

i have declared spinner position as Global variable

int spinnerposition;

here's how i retrieve the position:

public void saveposload(){
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
    int position = sharedPreferences.getInt(POSITION ,1);

    mspinner.setSelection(sharedPreferences.getInt(POSITION, position));
}

but i am not able to do so, app crashes please help

heres the exception from log

2018-12-30 15:13:49.904 3611-3611/my.uapp.com E/AndroidRuntime: FATAL EXCEPTION: main
Process: my.uapp.com, PID: 3611
java.lang.NumberFormatException: For input string: "it_IT"
    at java.lang.Integer.parseInt(Integer.java:521)
    at java.lang.Integer.valueOf(Integer.java:611)
    at my.uapp.com.Tab0$override.onItemSelected(Tab0.java:363)
    at my.uapp.com.Tab0$override.access$dispatch(Tab0.java)
    at my.uapp.com.Tab0.onItemSelected(Tab0.java)
    at android.widget.AdapterView.fireOnSelected(AdapterView.java:931)
    at android.widget.AdapterView.dispatchOnItemSelected(AdapterView.java:920)
    at android.widget.AdapterView.-wrap1(AdapterView.java)
    at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:890)
    at android.os.Handler.handleCallback(Handler.java:751)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6077)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:756)

标签： androidandroid-fragmentsandroid-viewandroid-spinner

解决方案

您localeList存储所有语言环境的列表，例如"it_IT"等？
如果是这种情况，那么：

localeList.get(position)

是一个字符串，它不能用这一行解析为int ：

spinnerposition = Integer.valueOf(String.valueOf(localeList.get(position)));

也许你只需要这个：

public void saveposload(){
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
    mspinner.setSelection(sharedPreferences.getInt(POSITION, 0));
}

确保saveposload()在设置适配器后调用。

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