如何编组/解组ContentValues以将泛型类型插入ContentProvider?

本文介绍了如何编组/解组ContentValues以将泛型类型插入ContentProvider?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我想将一个通用POJO放入ContentValues并将其在ContentProvider中解组.

I want to put a generic POJO into ContentValues and unmarshall it within the ContentProvider.

我一直在扭动我的小脑袋:Parcelables，ContentValues，然后插入SQLite 关于: njzk2.wordpress/2013/05/31/map-to-contentvalues-abusing-parcelable/

I've been wracking my tiny brain re: Parcelables, ContentValues, and inserting into SQLite Regarding: njzk2.wordpress/2013/05/31/map-to-contentvalues-abusing-parcelable/

如何编写通用在Android的Sqlite中插入数据的代码

我一直试图通过ContentProvider将android.location.Location插入SQLite:

I've been trying to insert a android.location.Location into SQLite via ContentProvider:

Location loc = mLocationClient.getLastLocation(); myParcel = android.os.Parcel.obtain(); loc.writeToParcel(myParcel, 0); ContentValues values = ContentValues.CREATOR.createFromParcel(myParcel );

使用包裹填充值.

问题1) 这是我的ContentProvider.insert方法:

Question 1) Here is my ContentProvider.insert method:

@Override public Uri insert( final Uri uri, final ContentValues values ){ SQLiteDatabase db = Mydatabase.getWritableDatabase(); //db.insert() doesn’t unmarshal the values?? db.insert( myTABLE_NAME, "", values); Uri result = null; db.close(); return result; }

这失败，因为db.insert()不会解组值(我相信) 插入android.database.sqlite.SQLiteException时出错:INSERT INTO myTABLE_NAME()VALUES(NULL)

this fails because the db.insert() doesn’t unmarshal the values (i believe) Error inserting android.database.sqlite.SQLiteException: INSERT INTO myTABLE_NAME() VALUES (NULL)

问题2) 有什么方法可以先解组值，然后再将其编组到另一个ContentValues变量中?也许有getKey()???

Question 2) Is there some way I can unmarshal values first and then marshal it back into another ContentValues variable? maybe w/ getKey()???

推荐答案

这有效:

HashMap hm = new HashMap(); Location loc = mLocationClient.getLastLocation(); hm.put("LOCATIONS", loc); android.os.Parcel myParcel = android.os.Parcel.obtain(); myParcel.writeMap(hm); myParcel.setDataPosition(0); ContentValues values = ContentValues.CREATOR.createFromParcel(myParcel); getContentResolver().insert(MyUri, values);

然后

@Override public Uri insert( final Uri uri, final ContentValues oldvalues ){ SQLiteDatabase db = GAELdatabase.getWritableDatabase(); Uri result = null; Location loc = (Location)oldvalues.get("LOCATIONS"); ContentValues values = new ContentValues(); values.put("ALTITUDE", loc.getAltitude());//meters above sea level values.put("LATITUDE", loc.getLatitude()); values.put("LONGITUDE", loc.getLongitude()); long rowID = db.insert( "MyTABLE_NAME", "", values); db.close(); return result; }