AccessTokenKeeper.java

package com.letv.watchball.share;

import com.sina.weibo.sdk.auth.Oauth2AccessToken;

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

/**
 * 该类用于保存Oauth2AccessToken到sharepreference，并提供读取功能
 * @author xiaowei6@staff.sina.com.cn
 *
 */
public class AccessTokenKeeper {
	private static final String PREFERENCES_NAME = "com_weibo_sdk_android";
	private static final String KEY_UID           = "uid";
    private static final String KEY_ACCESS_TOKEN  = "access_token";
    private static final String KEY_EXPIRES_IN    = "expires_in";
	/**
	 * 保存accesstoken到SharedPreferences
	 * @param context Activity 上下文环境
	 * @param token Oauth2AccessToken
	 */
	public static void keepAccessToken(Context context, Oauth2AccessToken token) {
		SharedPreferences pref = context.getSharedPreferences(PREFERENCES_NAME, Context.MODE_APPEND);
		Editor editor = pref.edit();
		editor.putString(KEY_UID, token.getUid());
        editor.putString(KEY_ACCESS_TOKEN, token.getToken());
        editor.putLong(KEY_EXPIRES_IN, token.getExpiresTime());
        editor.commit();
		
	}
	/**
	 * 清空sharepreference
	 * @param context
	 */
	public static void clear(Context context){
		
	    SharedPreferences pref = context.getSharedPreferences(PREFERENCES_NAME, Context.MODE_APPEND);
	    Editor editor = pref.edit();
	    editor.clear();
	    editor.commit();
	}

	/**
	 * 从SharedPreferences读取accessstoken
	 * @param context
	 * @return Oauth2AccessToken
	 */
	public static Oauth2AccessToken readAccessToken(Context context){
		 Oauth2AccessToken token = new Oauth2AccessToken();
	        SharedPreferences pref = context.getSharedPreferences(PREFERENCES_NAME, Context.MODE_APPEND);
	        token.setUid(pref.getString(KEY_UID, ""));
	        token.setToken(pref.getString(KEY_ACCESS_TOKEN, ""));
	        token.setExpiresTime(pref.getLong(KEY_EXPIRES_IN, 0));
		return token;
	}
}