将解析的 xml 数据存储到 sqlite ？安卓

Question

我想将 setListAdapter 显示的数据存储到 sqlite .. 我该怎么办？？ 请帮帮我

XML 文件http://p-xr.com/xml

包 com.pxr.tutorial.xmltest； 导入 java.util.ArrayList； 导入 java.util.HashMap； 导入 org.w3c.dom.Document； 导入 org.w3c.dom.Element； 导入 org.w3c.dom.NodeList； 导入android.app.ListActivity； 导入android.os.Bundle； 导入android.view.View； 导入 android.widget.AdapterView； 导入 android.widget.AdapterView.OnItemClickListener； 导入 android.widget.ListAdapter； 导入 android.widget.ListView； 导入 android.widget.SimpleAdapter； 导入 android.widget.Toast； 公共类 Main 扩展 ListActivity { /** 在第一次创建活动时调用。 */ @覆盖 公共无效 onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.listplaceholder); ArrayList> mylist = new ArrayList>(); 字符串 xml = XMLfunctions.getXML(); 文档 doc = XMLfunctions.XMLfromString(xml); int numResults = XMLfunctions.numResults(doc); if((numResults map = new HashMap(); 元素 e = (元素)nodes.item(i); map.put("id", XMLfunctions.getValue(e, "id")); map.put("name", "Naam:" + XMLfunctions.getValue(e, "name")); map.put("Score", "Score: " + XMLfunctions.getValue(e, "score")); mylist.add(地图); } ListAdapter 适配器 = new SimpleAdapter(this, mylist, R.layout.main, 新字符串[] { "id","name", "Score" }, 新的 int[] {R.id.id, R.id.item_title, R.id.item_subtitle }); setListAdapter（适配器）； /* 最终列表视图 lv = getListView(); lv.setTextFilterEnabled(true); lv.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView parent, View view, int position, long id) { @SuppressWarnings("未选中") HashMap o = (HashMap) lv.getItemAtPosition(position); Toast.makeText(Main.this, "ID '" + o.get("id") + "' 被点击。", Toast.LENGTH_LONG).show(); } });*/ } }

Answer 1

我建议你先解析数据然后存入数据库再显示。

如果您没有创建数据库，则必须先创建，示例代码如下所示

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

/**
 * 
 * @author Robert
 *
 */
public class DatabaseHelper extends SQLiteOpenHelper{

        /**
         * Default constructor- creates database
         * @param context
         */
        public DatabaseHelper(Context context) {
                super(context, DATABASE_NAME, null, 1);
        }

        /**
         * Implemented methood from SQLiteOpenHelper- called when
         * constructor of DatabaseHelper is called
         * Creates three tables (TRIP, POINT, TRANSFER) with relations
         * TRAVEL-POINT and POINT TRANSFER
         * @see SQLiteOpenHelper
         */
        @Override
        public void onCreate(SQLiteDatabase db) {
                db.execSQL("CREATE TABLE " + TRIP_TABLE_NAME
                                + "(_id INTEGER PRIMARY KEY AUTOINCREMENT, "
                                + FROM + " TEXT, "
                                + TO + " TEXT);");
                db.execSQL("CREATE TABLE " + TRANSFER_TABLE_NAME
                                + "(_id INTEGER PRIMARY KEY AUTOINCREMENT, "
                                + NOTE + " TEXT, "
                                + TIME + " TEXT, "
                                + DATE + " TEXT, "
                                + ADDRESS + " TEXT, "
                                + CITY + " TEXT, "
                                + COUNTRY + " TEXT, "
                                + LATITUDE + " TEXT, "
                                + LOGITUDE + " TEXT, "
                                + TRANFER_TYPE + " TEXT, "
                                + FK_POINT + " INTEGER NOT NULL REFERENCES "+ POINT_TABLE_NAME +"(_id)"
                                + "ON DELETE CASCADE);");
                db.execSQL("CREATE TABLE " + POINT_TABLE_NAME
                                + "(_id INTEGER PRIMARY KEY AUTOINCREMENT, "
                                + NAME + " TEXT, "
                                + ADDRESS + " TEXT, "
                                + CITY + " TEXT, "
                                + COUNTRY + " TEXT, "
                                + LATITUDE + " TEXT, "
                                + LOGITUDE + " TEXT, "
                                + FK_TRAVEL + " INTEGER NOT NULL REFERENCES "+ TRIP_TABLE_NAME +"(_id)"
                                + "ON DELETE CASCADE);");
        }

        /**
         * Implemented method from SQLiteOpenHelper- we don't use it now
         * @see SQLiteOpenHelper
         */
        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

        }

        /**
         * Private fields, mainly names of columns and tables in database
         */
        private static final String DATABASE_NAME = "TRAVELER_NOTEBOOK";

        //Table names
        private static final String TRIP_TABLE_NAME = "TRIP";
        private static final String POINT_TABLE_NAME = "POINT";
        private static final String TRANSFER_TABLE_NAME = "TRANSFER";

        //Columns names
        private static final String FROM = "FROM_PLACE";
        private static final String TO = "TO_PLACE";

        private static final String NAME = "NAME";
        private static final String ADDRESS = "ADDRESS";
        private static final String CITY = "CITY";
        private static final String COUNTRY = "COUNTRY";
        private static final String LATITUDE = "LATITUDE";
        private static final String LOGITUDE = "LOGITUDE";

        private static final String NOTE = "NOTE";
        private static final String TIME = "TIME";
        private static final String DATE = "DATE";
        private static final String TRANFER_TYPE = "TRANSFER_TYPE";

        //Foregin keys name
        private static final String FK_TRAVEL = "FK_TRAVEL_ID";
        private static final String FK_POINT = "FK_POINT_ID";

}

下一步是在你的活动中获取可写数据库，你可以通过创建来做到这一点

SQLiteDatabase database = (new DatabaseHelper(this).getWritableDatabase());

其中 DatabaseHelper 是您的数据库助手类的名称。如果你想在数据库中插入一些东西，就像下面这样：

        private void processAdd(values_to_save) {
                ContentValues values = new ContentValues(number_of_values);
                values.put(column_name, value);
                values.put(column_name, value);
                if(database!=null){
                database.insert(TABLE_NAME, null, values);
                } else{
                    Log.e("MyAppError", "Database is null");
                }
            }

ContentValue 类似于 HashMap 键值，其中键是列名，值是您要插入的内容。 请记住，在每个表中，您应该有列“_id 主键自动增量”，因为我记得很好，您不必这样做，但这会使您的项目更加复杂。