Android - 如何从其他活动获得共享偏好？

Question

在我的应用程序中有一个按钮(activity1).当用户点击它时我想在游戏中没有声音.我想我应该通过在按钮的onClick方法中使用activity1中的sharedpreferences来做到这一点:

SharedPreferences.Editor editor = mPrefs.edit();
editor.putString("sound","1");
editor.commit();

声音和游戏从另一个活动(activity2)开始.我需要在那里阅读set sharedpreferences,但我不知道该怎么做.

谢谢

编辑

我已经离开了这条线:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(Activity1.this);

根据您在Activity2.class中的帮助,我读了这样的首选项:

SharedPreferences myPrefs = getSharedPreferences("Activity1", MODE_PRIVATE);  //Activity1.class
String ifsound = myPrefs.getString("sound","");

 if (ifsound.equals("1"))
 {
     Toast.makeText(Activity1.this, "1", Toast.LENGTH_LONG).show();
 }
 else
 {
      Toast.makeText(Activity1.this, "0", Toast.LENGTH_LONG).show();
 }

1. 在Activity1.class中,我单击按钮将"声音"设置为"1".
2. 我点击另一个打开Activity2.class的btn,我总是在Toast msg中得到"0".

Answer 1

使用以下函数添加共享首选项并从所有活动中获取保存的值.

public static void setDefaults(String key, String value, Context context) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    SharedPreferences.Editor editor = preferences.edit();
    editor.putString(key, value);
    editor.commit();
}

public static String getDefaults(String key, Context context) {
    SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context);
    return preferences.getString(key, null);
}

Answer 2

在Activity1中保存首选项时使用:

SharedPreferences mPrefs = getSharedPreferences("IDvalue", 0);    
//Give any name for //preference as I have given "IDvalue" and value 0.    
SharedPreferences.Editor editor = mPrefs.edit();    
editor.putString(key, value);     
// give key value as "sound" you mentioned and value what you // to want give as "1" in you mentioned    
editor.commit();

在Activity2中检索共享值时使用:

SharedPreferences mPrefs = getSharedPreferences("IDvalue",0);    
String str = mPrefs.getString("sound", "");    
if (str.equals("1")) {    
     // Do what you want    
} else {    
    // Do what you want
}

Answer 3

您可以将其保存为一项活动:

SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
SharedPreferences.Editor editor = prefs.edit();
editor.putString("NameOfShared", "Value");
editor.commit();

从其他活动中获取:

final SharedPreferences mSharedPreference= PreferenceManager.getDefaultSharedPreferences(getBaseContext()); 
String value=(mSharedPreference.getString("NameOfShared", "Default_Value"));