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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;
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.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")
@Override
protected 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);
}
}