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Android 保存浏覽記錄 SharedPreTools

SharedPreference 在Android 開發過程中,被經常運用,今天來寫一下它的工具類

先介紹下 EdjApp ,屬於自定義的Android Application 創建全局變量

一、簡單的數據存儲方式,用來保存賬號、密碼等信息

二、用來保存多鍵值對象的id 等信息,如果我要獲取一組自定義的存儲對象,我可以先將它的id先保存下來

三、對象類型的數據存儲      一般用於自動登錄、浏覽歷史等

下面是工具類,serviceinfo對象是網絡獲取的信息對象,我會存儲並以查看時間的毫秒為對象的saveTime值

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.StreamCorruptedException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.commons.codec.binary.Base64;

import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;

import com.maq.api.ServiceInfo;
import com.maq.api.ServiceInfoComparator;
import com.maq.app.EdjApp;
public class SharedPreTools {
 
 //單鍵值存儲----------------------------
 public static String readShare(String sharename,String key) {
  SharedPreferences user =  EdjApp.getInstance().getSharedPreferences(sharename,0);
  return user.getString(key, "");
 }

 public static void writeShare(String sharename,String key,String value ) {
  SharedPreferences user = EdjApp.getInstance().getSharedPreferences(sharename, 0);
  Editor editor = user.edit();
  editor.putString(key, value);
  editor.commit();
 } 
 
 public static void removeShare(String sharename,String key ) {
  SharedPreferences user = EdjApp.getInstance().getSharedPreferences(sharename, 0);
  Editor editor = user.edit();
  editor.remove(key);
  editor.commit();
 }
 
 
 //多鍵值存儲
 public static void writegroup(String sharename,String key,String value) {
  SharedPreferences call = EdjApp.getInstance().getSharedPreferences(sharename, 0);
  String group = call.getString(key, "");
  if (group.indexOf(value) < 0) {
   String newgroup = group + "," + key;
   Editor editor = call.edit();
   editor.putString(key, newgroup);
   editor.commit();
  }
 }

 public static void removegroup(String sharename,String key) {
  SharedPreferences call =  EdjApp.getInstance().getSharedPreferences(sharename, 0);
  String group = call.getString(key, "");
  String newgroup = group.replace("," + key, "");
  Editor editor = call.edit();
  editor.putString(key, newgroup);
  editor.commit();
 }
 
 
 
 /**
  * 儲存單條對象  serviceInfo
  * @param per_name
  * @param key
  * @param vaule
  */
 public static void saveServicePre(String per_name,String key,Object vaule){
  SharedPreferences loginUserInfo = EdjApp.getInstance().
    getSharedPreferences(per_name, Context.MODE_APPEND);
  Editor preEd = null;
  if(loginUserInfo != null){
   preEd = loginUserInfo.edit();
  }
  if(preEd != null){
   if(vaule != null){   
    ServiceInfo info1=(ServiceInfo)vaule;
    info1.setSaveTime(getTimeId());
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
          ObjectOutputStream oos=null;
          try {
          oos = new ObjectOutputStream(baos);
         
          oos.writeObject(info1);
          } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
          }
    String info = new String(Base64.encodeBase64(baos.toByteArray()));
    preEd.putString(key, info);
   }
   preEd.commit();
  }
 }
 
 /**
  * 讀取對象集合  serviceInfo
  * @param per_name
  * @param oblist
  */
 public static <T> List<T> readAllServicePre(String per_name){
    SharedPreferences loginUserInfo = EdjApp.getInstance().
      getSharedPreferences(per_name, Context.MODE_APPEND);
    Map<String, ?> maps = loginUserInfo.getAll();//取出所有數據
      List<T> oblist = new ArrayList<T>();
    Iterator it = maps.values().iterator();
    while(it.hasNext()){
    String base64Str = (String) it.next();
    byte[] base64Bytes = Base64.decodeBase64(base64Str .getBytes());
    ByteArrayInputStream bais = new ByteArrayInputStream(base64Bytes);
    ObjectInputStream ois;
    try {
      ois = new ObjectInputStream(bais);
      T tempobj = (T) ois.readObject();
      oblist.add(tempobj);
//      LoginUser loginUser = (LoginUser)tempobj;
    } catch (StreamCorruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    }
      ArrayList<ServiceInfo>tempserviceInfo = new ArrayList<ServiceInfo>();
      tempserviceInfo.addAll((Collection<? extends ServiceInfo>) oblist);
     
   Comparator<ServiceInfo> ascComparator = new ServiceInfoComparator();
   Collections.sort(tempserviceInfo, ascComparator);
   oblist.clear();
   oblist.addAll((Collection<? extends T>) tempserviceInfo);
   
    return oblist;
 }
 /**
  * 刪除單條對象數據
  * @param per_name
  * @param key
  */
 public static void removeObjectPre(String per_name,String key){
  SharedPreferences loginUserInfo = EdjApp.getInstance().
    getSharedPreferences(per_name, Context.MODE_APPEND);
  Editor preEd = null;
  if(loginUserInfo != null){
   preEd = loginUserInfo.edit();
  }
  preEd.remove(key);
  preEd.commit();
 }
 
 //當前時間為id
 public static long getTimeId() {
  Date data = new Date();
  long time=data.getTime();
  return time;
 }
 
 //---------------------------
 /**
  * 儲存單條對象
  * @param per_name
  * @param key
  * @param vaule
  */
 public static void saveObjectPre(String per_name,String key,Object vaule){
  SharedPreferences loginUserInfo = EdjApp.getInstance().
    getSharedPreferences(per_name, Context.MODE_APPEND);
  Editor preEd = null;
  if(loginUserInfo != null){
   preEd = loginUserInfo.edit();
  }
  if(preEd != null){
   if(vaule != null){
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
          ObjectOutputStream oos=null;
          try {
          oos = new ObjectOutputStream(baos);
          oos.writeObject(vaule);
          } catch (IOException e) {
          // TODO Auto-generated catch block
          e.printStackTrace();
          }
    String info = new String(Base64.encodeBase64(baos.toByteArray()));
    preEd.putString(key, info);
   }
   preEd.commit();
  }
 }
 
 /**
  * 讀取對象集合
  * @param per_name
  * @param oblist
  */
 public static <T> List<T> readAllObjectPre(String per_name){
    SharedPreferences loginUserInfo = EdjApp.getInstance().
      getSharedPreferences(per_name, Context.MODE_APPEND);
    Map<String, ?> maps = loginUserInfo.getAll();//取出所有數據
      List<T> oblist = new ArrayList<T>();
    Iterator it = maps.values().iterator();
    while(it.hasNext()){
    String base64Str = (String) it.next();
    byte[] base64Bytes = Base64.decodeBase64(base64Str .getBytes());
    ByteArrayInputStream bais = new ByteArrayInputStream(base64Bytes);
    ObjectInputStream ois;
    try {
      ois = new ObjectInputStream(bais);
      T tempobj = (T) ois.readObject();
      oblist.add(tempobj);
    } catch (StreamCorruptedException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (ClassNotFoundException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    }
    return oblist;
 }
}

對象的排序,需要 根據設置的時間來算

import java.util.Comparator;

public class ServiceInfoComparator implements Comparator<ServiceInfo> {

 @Override
 public int compare(ServiceInfo object1, ServiceInfo object2) {
  // TODO Auto-generated method stub

  return Double.compare(object2.getSaveTime(), object1.getSaveTime());
 }

}

這樣的存取就能獲得查看的歷史記錄,同時可以延伸到通話記錄,收藏等

更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11

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