人人網官方android客戶端源碼分析

來源: ITeye 發布時間: 2011-11-02 16:01 閱讀: 4299 次推薦: 1 原文鏈接 [收藏]

摘要：本文針對最新人人網官方Android客戶端(4.2.1，該版本新增聊天功能)進行源碼分析，僅供Android學習交流使用!

　　ContentProvider是不同應用程序之間進行數據交換的標準API，ContentProvider以某種Uri的形式對外提供數據，允許其他應用訪問或修改數據;其他應用程序使用ContentResolver根據Uri去訪問操作指定數據。

　　人人網Android客戶端也是使用ContentProvider對需要保存于Android客戶端的數據進行管理。

　　1. renren.db

　　SQLLiteOpenHelper是Android提供的一個管理數據庫的工具類，可用于管理數據庫的創建和版本更新。一般的用法是創建SQLiteOpenHelper的子類，并擴展它的onCreate(SQLiteDatabase db)和onUpgrade(SQLiteDatabase db，int oldVersion，int newVersion)方法。

　　人人網Android客戶端使用該方法創建及修改用戶手機中的人人網數據庫(renren.db)。

　　下面是RenRenProvider$DatabaseHelper的代碼：

    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);   
        }   
    }

　　從代碼中我們可以看到人人網Android客戶端在用戶手機上創建了renren.db數據庫，數據庫中共有10張表，分別為pic、account、home、profile、friends、messages、favorites、emonticons、favoritefriends、chathistory。

　　2. RenRenProvider

　　前面我們已經提到過ContentProvider，下面我們來看看人人網Android客戶端是如何開發ContentProvider的。開發ContentProvider的兩步：1)開發一個ContentProvider的子類，該子類需要實現增、刪、改、查等方法。2)在AndroidManifest.xml文件中注冊該ContentProvider。

　　下面是RenRenProvider核心代碼：

    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/#", 8);   
            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;   
        }   
       
        //其它代碼省略...   
    }

　　下面是人人網android客戶端在AndroidMantifest.xml中對該ContentProvider的注冊。

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

　　從上面的分析我們了解到只要得到com.renren.mobile.android.permission.PERMISSION_ADD_ACCOUNT權限我們就可以通過特定Uri訪問人人網Android客戶端在用戶手機上創建的renren.db中特定表了。

　　3. 開發Android應用訪問renren.db中的數據

　　從上面分析中我們已經知道renren.db中表結構，及訪問特定表對應的Uri，如我們可以通過content://com.renren.mobile.provider/account訪問renren.db中的account表等等。下面我們寫個很簡單的例子來訪問account表中的account和ticket字段。

　　main.xml根節點下簡單添加2個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"/>

　　將account和ticket信息顯示到TextView中，類代碼如下

  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();   
            }   
       
            // 遍歷Cursor結果集   
            while (cursor.moveToNext()) {   
                // 將結果集中的數據存入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，上面的應用程序需要操作人人網android客戶端中的數據庫，因此要記得在AndroidMantifest.xml文件中為該應用程序授權。也就是在該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手機中安裝有人人網Android客戶端且曾經使用過，那么renren.db中應該有數據存在，把上面應用打包為apk文件安裝到你android手機中，運行它，應該能看到屏幕中將顯示你的人人網賬號及一串ticket，該ticket是人人網Andriod客戶端部分功能與人人網服務器通信的sid。

　　同理，也可以使用其它特定Uri訪問手機中renre.db中特定的表，如friends表等等，所有Uri詳見RenRenProvider代碼。