本文主要是介绍SharedPreferences工具类（2种），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
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-----------------------------------------------------------------首先看方法1------------------------------------------------------------------------------
SharedPreferencesUtils1
package com.example.sharedpreferences;import android.content.Context;
import android.content.SharedPreferences;
import android.support.annotation.NonNull;public class SharedPreferencesUtils1 {private String name;private Context mContext;/*** 当instance==null时候，加同步锁* * @return*/private static SharedPreferencesUtils1 instance;public static SharedPreferencesUtils1 getInstance() {if (instance == null) {synchronized (SharedPreferencesUtils1.class) {if (instance == null) {instance = new SharedPreferencesUtils1();}}}return instance;}private SharedPreferencesUtils1() {}/*** 初始化上下文参数以及文件名* * @param context* ，上下文* @param name* ，文件名*/public void init(Context context, String name) {this.mContext = context.getApplicationContext();this.name = name;}/*** 保存数据,泛型方法* * @param key* ，键值* @param value* ，数据* @param <V>*/public <V> void setValue(@NonNull String key, V value) {SharedPreferences sp = mContext.getSharedPreferences(name,Context.MODE_PRIVATE);SharedPreferences.Editor editor = sp.edit();if (value instanceof String) {editor.putString(key, (String) value);} else if (value instanceof Integer) {editor.putInt(key, (Integer) value);} else if (value instanceof Long) {editor.putLong(key, (Long) value);} else if (value instanceof Boolean) {editor.putBoolean(key, (Boolean) value);} else if (value instanceof Float) {editor.putFloat(key, (Float) value);}editor.commit();}/*** 读取数据,泛型方法* * @param key* ，键值* @param defaultValue* ，默认值* @param <V>* @return*/public <V> V getValue(@NonNull String key, V defaultValue) {SharedPreferences sp = mContext.getSharedPreferences(name,Context.MODE_PRIVATE);Object value = defaultValue;if (defaultValue instanceof String) {value = sp.getString(key, (String) defaultValue);} else if (defaultValue instanceof Integer) {value = sp.getInt(key, (Integer) defaultValue);} else if (defaultValue instanceof Long) {value = sp.getLong(key, (Long) defaultValue);} else if (defaultValue instanceof Boolean) {value = sp.getBoolean(key, (Boolean) defaultValue);} else if (defaultValue instanceof Float) {value = sp.getFloat(key, (Float) defaultValue);}return (V) value;}/*** 清除数据*/public void clearData() {SharedPreferences.Editor editor = mContext.getSharedPreferences(name,Context.MODE_PRIVATE).edit();editor.clear();editor.commit();}
}-----------------------------------------------------------------继续看方法2------------------------------------------------------------------------------
GDPreferenceSettings
package com.example.sharedpreferences;public enum GDPreferenceSettings {SETTING_IS_FIRST("com.godinsec.glauncher_isFirstIn", Boolean.TRUE);private final String mId;private final Object mDefaultValue;private GDPreferenceSettings(String id, Object defaultValue) {this.mId = id;this.mDefaultValue = defaultValue;}public String getId() {return this.mId;}public Object getDefaultValue() {return this.mDefaultValue;}}
GDPreferences
package com.example.sharedpreferences;import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;public class GDPreferences {public static final String CCP_PREFERENCE = "geek2.xml";private static GDPreferences instance;public static GDPreferences getInstance() {if (instance == null) {synchronized (GDPreferences.class) {if (instance == null) {instance = new GDPreferences();}}}return instance;}private GDPreferences() {super();}public static SharedPreferences getSharedPreferences() {return MyApplication.getInstance().getSharedPreferences(CCP_PREFERENCE,Context.MODE_PRIVATE);}public static void savePreference(GDPreferenceSettings GDPreferenceSetting,Object value) {Map<GDPreferenceSettings, Object> prefs = new HashMap<GDPreferenceSettings, Object>();prefs.put(GDPreferenceSetting, value);savePreferences(prefs);}private static void savePreferences(Map<GDPreferenceSettings, Object> prefs) {SharedPreferences sp = getSharedPreferences();Editor editor = sp.edit();Iterator<GDPreferenceSettings> it = prefs.keySet().iterator();while (it.hasNext()) {GDPreferenceSettings pref = it.next();Object value = prefs.get(pref);if (value == null) {return;}if (value instanceof Boolean&& pref.getDefaultValue() instanceof Boolean) {editor.putBoolean(pref.getId(),((Boolean) value).booleanValue());} else if (value instanceof String&& pref.getDefaultValue() instanceof String) {editor.putString(pref.getId(), (String) value);} else if (value instanceof Integer&& pref.getDefaultValue() instanceof Integer) {editor.putInt(pref.getId(), (Integer) value);} else if (value instanceof Long&& pref.getDefaultValue() instanceof Long) {editor.putLong(pref.getId(), (Long) value);}}editor.commit();}
}
MyApplication
package com.example.sharedpreferences;import android.app.Application;public class MyApplication extends Application {private static MyApplication instance;@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();this.instance = this;}public static MyApplication getInstance(){return instance;}}
最后看测试代码
MainActivity
package com.example.sharedpreferences;import android.app.Activity;
import android.os.Bundle;
import android.text.StaticLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;public class MainActivity extends Activity {private static final String TAG = MainActivity.class.getSimpleName();@SuppressWarnings("static-access")@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/*** 方法一*/SharedPreferencesUtils1 sp = SharedPreferencesUtils1.getInstance();sp.init(this, "geek.xml");sp.<String>setValue("name", "geek");String value = sp.<String>getValue("name", "");Log.i(TAG, "value-->"+value);/*** 方法二*/GDPreferences.getInstance().savePreference(GDPreferenceSettings.SETTING_IS_FIRST, false);boolean SETTING_IS_FIRST = GDPreferences.getSharedPreferences().getBoolean(GDPreferenceSettings.SETTING_IS_FIRST.getId(), (Boolean) GDPreferenceSettings.SETTING_IS_FIRST.getDefaultValue());Log.i(TAG, "SETTING_IS_FIRST-->"+SETTING_IS_FIRST);}}
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