ADD file via upload

MyApplication.java

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+package com.example;
+
+import android.app.Application;
+import android.database.sqlite.SQLiteDatabase;
+
+import com.example.greendao.DaoMaster;
+import com.example.greendao.DaoSession;
+
+
+
+
+public class MyApplication extends Application {
+    private static DaoSession daoSession;
+    private static MyApplication instance;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        instance = this;
+        //必须调用初始化
+
+        //配置数据库
+        setupDatabase();
+    }
+
+    public static MyApplication getInstance() {
+        return instance;
+    }
+
+    /**
+     * 配置数据库
+     */
+    private void setupDatabase() {
+        //创建数据库shop.db"
+        DaoMaster.DevOpenHelper helper = new DaoMaster.DevOpenHelper(this, "shop.db", null);
+        //获取可写数据库
+        SQLiteDatabase db = helper.getWritableDatabase();
+        // 获取数据库对象
+        DaoMaster daoMaster = new DaoMaster(db);
+        // 获取Dao对象管理者
+        daoSession = daoMaster.newSession();
+    }
+
+    public static DaoSession getDaoInstant() {
+        return daoSession;
+    }
+
+}