Question

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

package com.pxr.tutorial.xmltest;

import java.util.ArrayList;
import java.util.HashMap;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class Main extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.listplaceholder);

        ArrayList> mylist = new ArrayList>();


        String xml = XMLfunctions.getXML();
        Document doc = XMLfunctions.XMLfromString(xml);

        int numResults = XMLfunctions.numResults(doc);

        if((numResults  map = new HashMap();    

            Element e = (Element)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(map);            
        }       

        ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.main, 
                        new String[] { "id","name", "Score" }, 
                        new int[] {R.id.id, R.id.item_title, R.id.item_subtitle });

        setListAdapter(adapter);

       /* final ListView lv = getListView();
        lv.setTextFilterEnabled(true);  
        lv.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View view, int position, long id) {              
                @SuppressWarnings("unchecked")
                HashMap o = (HashMap) lv.getItemAtPosition(position);                   
                Toast.makeText(Main.this, "ID '" + o.get("id") + "' was clicked.", Toast.LENGTH_LONG).show(); 

            }
        });*/
    }
}

Answer 1

我建议你首先解析数据然后将其保存到数据库然后显示。

如果您没有创建数据库，则必须先执行此操作，示例代码如何执行此操作

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";

}

下一步是在您的活动中获取可写数据库，您可以通过创建

来实现

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

其中DatabaseHelper是数据库帮助程序类的名称。如果你想在数据库中插入一些内容，只需要像下面那样制作一些类似的东西：

        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，其中键是列名和值 - 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，您没有必要，但它会使您的项目更复杂。

将已解析的xml数据存储到sqlite？ Android的

1 个答案: