Preferences.java

最新推荐文章于 2023-05-08 16:23:28 发布

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最新推荐文章于 2023-05-08 16:23:28 发布

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CC 4.0 BY-SA版权

文章标签： java 移动开发

原文链接：http://www.cnblogs.com/thens/p/5513697.html

本文介绍了一个用于管理Android应用中偏好设置的实用类。该类提供了一系列方法来方便地读取和写入偏好设置数据，包括布尔值、整数、浮点数等多种数据类型。

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 1 import android.content.Context;
 2 import android.content.SharedPreferences;
 3 
 4 import java.util.Set;
 5 
 6 public class Preferences {
 7     private static final String PREFERENCES_MAIN = K.app.package_name + ".main";
 8     private static Preferences singleton = null;
 9 
10     private SharedPreferences pref;
11     private SharedPreferences.Editor editor;
12 
13     public Preferences (Context context, String prefName) {
14         pref = context.getSharedPreferences(prefName, Context.MODE_PRIVATE);
15         editor = pref.edit();
16     }
17     public Preferences (String prefName) {
18         this(App.getInstance(), prefName);
19     }
20 
21     public static Preferences getInstance () {
22         if (singleton == null) {
23             singleton = new Preferences(PREFERENCES_MAIN);
24         }
25         return singleton;
26     }
27 
28     public boolean contains (String key) { return pref.contains(key); }
29 
30     public boolean get (String key, boolean def) { return pref.getBoolean(key, def); }
31     public int get (String key, int def) { return pref.getInt(key, def); }
32     public long get (String key, long def) { return pref.getLong(key, def); }
33     public float get (String key, float def) { return pref.getFloat(key, def); }
34     public Set<String> get (String key, Set<String> def) { return pref.getStringSet(key, def); }
35     public String get (String key) { return get(key, ""); }
36     public String get (String key, String def) { return pref.getString(key, def == null ? "" : def); }
37 
38     public Preferences put (String key, boolean value) { getEditor().putBoolean(key, value); return this; }
39     public Preferences put (String key, int value) { getEditor().putInt(key, value); return this; }
40     public Preferences put (String key, long value) { getEditor().putLong(key, value); return this; }
41     public Preferences put (String key, float value) { getEditor().putFloat(key, value); return this; }
42     public Preferences put (String key, String value) { getEditor().putString(key, value == null ? "" : value); return this;  }
43     public Preferences put (String key, Set<String> value) { getEditor().putStringSet(key, value); return this; }
44 
45     public Preferences remove (String key) { editor.remove(key); return this; }
46     public Preferences clear () { editor.clear(); return this; }
47 
48     public Preferences commit () {
49 //        if (editor != null) {
50 //            editor.commit();
51 //            editor = null;
52 //        }
53         editor.commit();
54         return this;
55     }
56 
57     private SharedPreferences.Editor getEditor () {
58         if (editor == null) {
59             editor = pref.edit();
60         }
61         return editor;
62     }
63 }