import android.content.Context;import android.content.ContextWrapper;import android.database.DatabaseErrorHandler;import android.database.sqlite.SQLiteDatabase;import com.tbc.android.defaults.app.business.cache.AppUserCache;import com.tbc.android.defaults.app.utils.AppPathUtil;import com.tbc.android.mc.storage.ApplicationCache;import java.io.File;/** * Created by Doraemon * Date: 16/5/12 * Time: 09:22 * Summary:该类主要用于基于GreenDao框架自定义数据库路径 */public class GreenDaoContext extends ContextWrapper {    private String currentUserId;    private Context mContext;    public GreenDaoContext() {        super(ApplicationCache.context);        this.mContext = ApplicationCache.context;        this.currentUserId = AppUserCache.userInfo.getUserId();    }    /**     * 获得数据库路径，如果不存在，则创建对象     *     * @param dbName     */    @Override    public File getDatabasePath(String dbName) {        File baseFile = AppPathUtil.getDbCacheDir(mContext);        StringBuffer buffer = new StringBuffer();        buffer.append(baseFile.getPath());        buffer.append(File.separator);        buffer.append(currentUserId);        buffer.append(File.separator);        buffer.append(dbName);        return new File(buffer.toString());    }    /**     * 重载这个方法，是用来打开SD卡上的数据库的，android 2.3及以下会调用这个方法。     *     * @param name     * @param mode     * @param factory     */    @Override    public SQLiteDatabase openOrCreateDatabase(String name, int mode,                                               SQLiteDatabase.CursorFactory factory) {        SQLiteDatabase result = SQLiteDatabase.openOrCreateDatabase(getDatabasePath(name), factory);        return result;    }    /**     * Android 4.0会调用此方法获取数据库。     *     * @param name     * @param mode     * @param factory     * @param errorHandler     * @see android.content.ContextWrapper#openOrCreateDatabase(java.lang.String, int,     * android.database.sqlite.SQLiteDatabase.CursorFactory,     * android.database.DatabaseErrorHandler)     */    @Override    public SQLiteDatabase openOrCreateDatabase(String name, int mode, SQLiteDatabase.CursorFactory factory,                                               DatabaseErrorHandler errorHandler) {        SQLiteDatabase result = SQLiteDatabase.openOrCreateDatabase(getDatabasePath(name), factory);        return result;    }}

自定义一个context，然后在获取helper时，将自定义的context传入，如下：

 

DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(new GreenDaoContext(), "app.db", null);SQLiteDatabase db = helper.getWritableDatabase();// 注意：该数据库连接属于 DaoMaster，所以多个 Session 指的是相同的数据库连接。DaoMaster daoMaster = new DaoMaster(db);DaoSession daoSession = daoMaster.newSession();