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人们网官方Android客户端源码分析

热度:101   发布时间:2016-05-01 19:26:45.0
人人网官方Android客户端源码分析
ContentProvider是不同应用程序之间进行数据交换的标准API,ContentProvider以某种Uri的形式对外提供数据,允许其他应用访问或修改数据;其他应用程序使用ContentResolver根据Uri去访问操作指定数据。
人人网Android客户端也是使用ContentProvider对需要保存于Android客户端的数据进行管理。
1. renren.db
SQLLiteOpenHelper是Android提供的一个管理数据库的工具类,可用于管理数据库的创建和版本更新。一般的用法是创建SQLiteOpenHelper的子类,并扩展它的onCreate(SQLiteDatabase  db)和onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion)方法。
人人网Android客户端使用该方法创建及修改用户手机中的人人网数据库(renren.db)。
下面是RenRenProvider$DatabaseHelper的代码:

        public class RenRenProvider$DatabaseHelper extends SQLiteOpenHelper {  
            public RenRenProvider$DatabaseHelper(Context context) {  
                super(context, "renren.db", null, 71);  
            }  
         
            @Override  
            public void onCreate(SQLiteDatabase db) {  
                db.execSQL("CREATE TABLE pic (_id INTEGER PRIMARY KEY,url TEXT UNIQUE ON CONFLICT REPLACE,_data TEXT,size INTEGER);");  
                db.execSQL("CREATE TABLE account (_id INTEGER PRIMARY KEY,uid INTEGET,account TEXT UNIQUE ON CONFLICT REPLACE,pwd TEXT,proxy INTEGER,sessionkey TEXT,srt_key TEXT,ticket TEXT,name TEXT,headphoto BLOB,isdefault INTEGER,last_login INTEGER,friend_count INTEGER);");  
                db.execSQL("CREATE TABLE home (_id INTEGER PRIMARY KEY,item_id INTEGER UNIQUE ON CONFLICT REPLACE,data BLOB);");  
                db.execSQL("CREATE TABLE profile (_id INTEGER PRIMARY KEY,type INTEGER UNIQUE ON CONFLICT REPLACE,data BLOB);");  
                db.execSQL("CREATE TABLE friends (_id INTEGER PRIMARY KEY,uid INTEGER UNIQUE ON CONFLICT REPLACE,username TEXT,headurl TEXT,doing TEXT,nameindex TEXT,namepinyin TEXT,friendgroup TEXT,network TEXT,gender TEXT,isfriend INTEGER,suggest_text_1 TEXT,suggest_intent_query TEXT);");  
                db.execSQL("CREATE TABLE messages (_id INTEGER PRIMARY KEY,messageid INTEGER UNIQUE ON CONFLICT REPLACE,message BLOB);");  
                db.execSQL("CREATE TABLE favorites (_id INTEGER PRIMARY KEY,favoriteid BIGINT UNIQUE ON CONFLICT REPLACE,favoriteowner INTEGER,type INTEGER,favorite BLOB);");  
                db.execSQL("CREATE TABLE emonticons (_id INTEGER PRIMARY KEY,url TEXT,emotion TEXT  UNIQUE ON CONFLICT REPLACE,img BLOB,size INTEGER,_data TEXT);");  
                db.execSQL("CREATE TABLE favoritefriends (_id INTEGER PRIMARY KEY,owner INTEGER,uid INTEGER,name TEXT);");  
                db.execSQL("CREATE TABLE chathistory (_id INTEGER PRIMARY KEY,uid INTEGER,tochatid INTEGER,chatmessage TEXT,comefrom INTEGER,chatname TEXT,chattime LONG);");  
            }  
         
            @Override  
            public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {  
                db.execSQL("DROP TABLE IF EXISTS pic");  
                db.execSQL("DROP TABLE IF EXISTS account");  
                db.execSQL("DROP TABLE IF EXISTS home");  
                db.execSQL("DROP TABLE IF EXISTS profile");  
                db.execSQL("DROP TABLE IF EXISTS friends");  
                db.execSQL("DROP TABLE IF EXISTS messages");  
                db.execSQL("DROP TABLE IF EXISTS favorites");  
                db.execSQL("DROP TABLE IF EXISTS emonticons");  
                db.execSQL("DROP TABLE IF EXISTS favoritefriends");  
                db.execSQL("DROP TABLE IF EXISTS favoritefriends");  
                db.execSQL("DROP TABLE IF EXISTS chathistory");  
                onCreate(db);  
            }  
        }  
从代码中我们可以看到人人网Android客户端在用户手机上创建了renren.db数据库,数据库中共有10张表,分别为pic、account、home、profile、friends、messages、favorites、emonticons、favoritefriends、chathistory。
2. RenRenProvider
前面我们已经提到过ContentProvider,下面我们来看看人人网Android客户端是如何开发ContentProvider的。开发ContentProvider的两步:1)开发一个ContentProvider的子类,该子类需要实现增、删、改、查等方法。2)在AndroidManifest.xml文件中注册该ContentProvider。
下面是RenRenProvider核心代码:

    public class RenRenProvider extends ContentProvider {  
      
        public static final String AUTHORITY = "com.renren.mobile.provider";  
      
        public static final class Account implements BaseColumns {  
            public static final Uri ACCOUNT_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/account");  
        }  
        public static final class ChatHistory implements BaseColumns {  
            public static final Uri CHAT_HISTORY_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/chathistory");  
        }  
        public static final class Emonticons implements BaseColumns {  
            public static final Uri EMONTICONS_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/emonticons");  
        }  
        public static final class Favorite implements BaseColumns {  
            public static final Uri FAVORITE_CONTENTURI = Uri  
                    .parse("content://com.renren.mobile.provider/favorites");  
        }  
        public static final class FavoriteFriends implements BaseColumns {  
            public static final Uri FAVORITE_FRIENDS_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/favoritefriends");  
        }  
        public static final class Friends implements BaseColumns {  
            public static final Uri FRIENDS_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/friends");  
        }  
        public static final class Home implements BaseColumns {  
            public static final Uri HOME_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/home");  
        }  
      
        public static final class Messages implements BaseColumns {  
            public static final Uri MESSAGES_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/messages");  
        }  
      
        public static final class Pic implements BaseColumns {  
            public static final Uri PIC_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/pic");  
        }  
        public static final class Profile implements BaseColumns {  
            public static final Uri PROFILE_CONTENT_URI = Uri  
                    .parse("content://com.renren.mobile.provider/profile");  
        }  
      
        private static final UriMatcher URI_MATCHER;  
        private RenRenProvider.DatabaseHelper renrenDatabaseHelper;  
      
        static {  
            URI_MATCHER = new UriMatcher(UriMatcher.NO_MATCH);  
            URI_MATCHER.addURI(AUTHORITY, "pic", 3);  
            URI_MATCHER.addURI(AUTHORITY, "pic/#", 4);  
            URI_MATCHER.addURI(AUTHORITY, "account", 5);  
            URI_MATCHER.addURI(AUTHORITY, "account/#", 6);  
            URI_MATCHER.addURI(AUTHORITY, "home", 7);  
            URI_MATCHER.addURI(AUTHORITY, "home/#",;  
            URI_MATCHER.addURI(AUTHORITY, "profile", 9);  
            URI_MATCHER.addURI(AUTHORITY, "profile/#", 10);  
            URI_MATCHER.addURI(AUTHORITY, "friends", 11);  
            URI_MATCHER.addURI(AUTHORITY, "friends/#", 12);  
            URI_MATCHER.addURI(AUTHORITY, "search_suggest_query/*", 1);  
            URI_MATCHER.addURI(AUTHORITY, "search_suggest_query", 2);  
            URI_MATCHER.addURI(AUTHORITY, "messages", 13);  
            URI_MATCHER.addURI(AUTHORITY, "messages/#", 14);  
            URI_MATCHER.addURI(AUTHORITY, "favorites", 15);  
            URI_MATCHER.addURI(AUTHORITY, "favorites/#", 16);  
            URI_MATCHER.addURI(AUTHORITY, "emonticons", 17);  
            URI_MATCHER.addURI(AUTHORITY, "emonticons/#", 18);  
            URI_MATCHER.addURI(AUTHORITY, "favoritefriends", 19);  
            URI_MATCHER.addURI(AUTHORITY, "favortiefriends/#", 20);  
            URI_MATCHER.addURI(AUTHORITY, "chathistory", 21);  
            URI_MATCHER.addURI(AUTHORITY, "chathistory/#", 22);  
            URI_MATCHER.addURI(AUTHORITY, "chathistory/*/*", 23);  
        }  
      
        public boolean onCreate()  
        {  
            renrenDatabaseHelper = new RenRenProvider.DatabaseHelper(this.getContext());  
            return true;  
        }  
      
        //其它代码省略...  
    } 


下面是人人网android客户端在AndroidMantifest.xml中对该ContentProvider的注册。



        <providerandroid:nameproviderandroid:nameproviderandroid:nameproviderandroid:name=".contentprovider.RenRenProvider" android:permission="com.renren.mobile.android.permission.PERMISSION_ADD_ACCOUNT"  
        android:authorities="com.renren.mobile.provider" />  


从上面的分析我们了解到只要得到com.renren.mobile.android.permission.PERMISSION_ADD_ACCOUNT权限我们就可以通过特定Uri访问人人网Android客户端在用户手机上创建的renren.db中特定表了。
3. 开发Android应用访问renren.db中的数据
从上面分析中我们已经知道renren.db中表结构,及访问特定表对应的Uri,如我们可以通过content://com.renren.mobile.provider/account访问renren.db中的account表等等。下面我们写个很简单的例子来访问account表中的account和ticket字段。
main.xml根节点下简单添加2个TextView,如下:



    <TextView  
            android:id="@+id/textView1"  
            android:layout_width="fill_parent"  
            android:layout_height="wrap_content"  
            android:text="TextView" />  
      
      
    <TextView  
            android:id="@+id/textView2"  
            android:layout_width="fill_parent"  
            android:layout_height="wrap_content"  
            android:text="TextView" />

 
将account和ticket信息显示到TextView中,类代码如下

    public class RenRenExtActivity extends Activity {  
      
        private static final Uri ACCOUNT_CONTENT_URI = Uri  
                .parse("content://com.renren.mobile.provider/account");  
      
        @Override  
        public void onCreate(Bundle savedInstanceState) {  
            super.onCreate(savedInstanceState);  
            setContentView(R.layout.main);  
      
            TextView textView1 = (TextView) findViewById(R.id.textView1);  
            textView1.setText("Sorry.");  
            TextView textView2 = (TextView) findViewById(R.id.textView2);  
            textView2.setText("Sorry2.");  
      
            Cursor cursor = getContentResolver().query(ACCOUNT_CONTENT_URI, null,  
                    null, null, null);  
      
            List<Map<String, String>> resultList = converCursorToList(cursor);  
            if (!resultList.isEmpty()) {  
                Map<String, String> map = resultList.get(0);  
                textView1.setText(map.get("account"));  
                textView2.setText(map.get("ticket"));  
            }  
        }  
      
        private List<Map<String, String>> converCursorToList(Cursor cursor) {  
            List<Map<String, String>> result = new ArrayList<Map<String, String>>();  
      
            if (cursor == null) {  
                return Collections.emptyList();  
            }  
      
            // 遍历Cursor结果集  
            while (cursor.moveToNext()) {  
                // 将结果集中的数据存入ArrayList中  
                Map<String, String> map = new HashMap<String, String>();  
                map.put("account",  
                        cursor.getString(cursor.getColumnIndex("account")));  
                map.put("ticket", cursor.getString(cursor.getColumnIndex("ticket")));  
                result.add(map);  
            }  
            return result;  
        }  
    }
需要指出的是,上面的应用程序需要操作人人网android客户端中的数据库,因此要记得在AndroidMantifest.xml文件中为该应用程序授权。也就是在该文件的根元素中添加如下元素:

    <uses-permission android:name="com.renren.mobile.android.permission.PERMISSION_ADD_ACCOUNT" />

如果你android手机中安装有人人网Android客户端且曾经使用过,那么renren.db中应该有数据存在,把上面应用打包为apk文件安装到你android手机中,运行它,应该能看到屏幕中将显示你的人人网账号及一串ticket,该ticket是人人网Andriod客户端部分功能与人人网服务器通信的sid。
同理,也可以使用其它特定Uri访问手机中renre.db中特定的表,如friends表等等,所有Uri详见RenRenProvider代码。

综合帖:http://www.apkway.com/forum.php?mod=viewthread&tid=4840
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