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我有这个数据库文件如下，还有我想在其中显示存储名称的活动文件

package a.vaccination;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;

public class datahandler {

public static final String KEY_ROWID = "id";
public static final String KEY_name = "name";
public static final String KEY_dob = "dob";
public static final String KEY_contact = "contact";
public static final String KEY_email = "email";
private static final String TAG = "DBAdapter";

private static final String DATABASE_NAME = "profile";
private static final String DATABASE_TABLE = "baby";
private static final int DATABASE_VERSION = 2;

private static final String DATABASE_CREATE = "create table baby(id integer 
primary key autoincrement, "
        + "name VARCHAR not null, dob date, contact VARCHAR, email  
VARCHAR);";
private final Context context;

private DatabaseHelper DBHelper;
private SQLiteDatabase db;

public datahandler(Context ctx) {
    this.context = ctx;
    DBHelper = new DatabaseHelper(context);
}

protected static class DatabaseHelper extends SQLiteOpenHelper {
    DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        try {
            db.execSQL(DATABASE_CREATE);
            // db = DBHelper.getWritableDatabase();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
                + newVersion + ", which will destroy all old  
data");
        db.execSQL("DROP TABLE IF EXISTS contacts");
        onCreate(db);
    }
}

// ---opens the database---
public datahandler open() throws SQLException {
    db = DBHelper.getWritableDatabase();
    return this;
}

// ---closes the database---
public void close() {
    DBHelper.close();
}

// ---insert a record into the database---
public long insertRecord(String name, String dob, String contact,
        String email) {
    ContentValues initialValues = new ContentValues();
    initialValues.put(KEY_name, name);
    initialValues.put(KEY_dob, dob);
    initialValues.put(KEY_contact, contact);
    initialValues.put(KEY_email, email);
    return db.insert(DATABASE_TABLE, null, initialValues);
}

// ---updates a record---
public boolean updateRecord(long rowId, String name, String dob,
        String contact, String email) {
    ContentValues args = new ContentValues();
    args.put(KEY_name, name);
    args.put(KEY_dob, dob);
    args.put(KEY_contact, contact);
    args.put(KEY_email, email);
    return db.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
public Cursor getAllTitles()
{
return db.query(DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_name,
KEY_dob,
KEY_contact,
KEY_email},
null,
null,
null,
null,
null,
null);
}
//---retrieves a particular title---
public Cursor getTitle(long rowId) throws SQLException
{
Cursor mCursor =
db.query(true, DATABASE_TABLE, new String[] {
KEY_ROWID,
KEY_name,
KEY_email,
KEY_dob,KEY_contact
},
KEY_ROWID + "=" + rowId,
null,
null,
null,
null,
null,null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
}

和活动文件，我想在其中检索名称表单数据库并在列表视图中显示它我做了一些编码但我卡住了请帮助我

package a.vaccination;

import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

//this shows profies of baby and option of add new one
public class profilelist extends Activity implements OnItemClickListener {

datahandler db = new datahandler(this);

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.child);
    String nbaby[] = null;

    display();

    Button add = (Button) findViewById(R.id.button1);
    ListView names = (ListView) findViewById(R.id.listView1);

    ArrayAdapter<String> ad = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, nbaby);

    names.setAdapter(ad);
    names.setOnItemClickListener(this);

    add.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // navigate to create profile
            Intent it = new Intent(profilelist.this, 
createprofile.class);
            startActivity(it);

        }
    });

}

private void display() {
    // TODO Auto-generated method stub
    db.open();

    try {
        Cursor c = db.getAllTitles();
        if (c.moveToFirst()) {
            do {
                // System.out.println("bool2");
                DisplayTitle(c);
            } while (c.moveToNext());
        }
    } catch (Exception e) {
        // System.out.println(e);
    }
    db.close();
}

private void DisplayTitle(Cursor c) {
    // TODO Auto-generated method stub
//  System.out.println("bool");
    /*Toast.makeText(this,
    "id: " + c.getString(0) + "\n" +
    "ISBN: " + c.getString(1) + "\n" +
    "TITLE: " + c.getString(2) + "\n" +
    "PUBLISHER: " + c.getString(3),
    Toast.LENGTH_LONG).show();*/    

    nbaby[]=c.getString(0);


}

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
    // TODO Auto-generated method stub

}

}
4

2 回答 2

0

试试下面的代码： 如果你还没有向数据库中插入任何数据，那么首先插入数据，然后将其绑定到列表视图中。为了方便起见，我尝试在 onCreate 中插入一些记录。如果您已经插入了记录，则从 onCreate() 中删除插入代码。

我已将光标的所有值存储到ArrayList<String>并将其绑定到列表视图中。您可以查看下面的代码。它的工作完美。

  public class profilelist extends Activity implements OnItemClickListener
    {
datahandler db = new datahandler(this);
String nbaby[] = null;
ArrayList<String> m_arr=null;
@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

           db.open();
    db.insertRecord("Texst", "10-1-1989","gaskudfgaskf", "teste@yahoo.com");
    db.close(); 

    display();
    Button add = (Button) findViewById(R.id.button1);
    ListView names = (ListView) findViewById(R.id.listView1);
    ArrayAdapter<String> ad =
            new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, m_arr);
    names.setAdapter(ad);
    names.setOnItemClickListener(this);
    add.setOnClickListener(new OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            // navigate to create profile
        Intent it = new Intent(profilelist.this, createprofile.class);
            startActivity(it);
        }
    });
      }
private void display()
{
    // TODO Auto-generated method stub
    db.open();
    m_arr=new ArrayList<String>();
    try
    {
        Cursor c = db.getAllTitles();
            c.moveToFirst();
            do
            {
                m_arr.add(c.getString(1));
                 System.out.println("bool2"+c.getString(1).toString());
                } while (c.moveToNext());
    }
    catch (Exception e)
    {
        // System.out.println(e);
    }
    db.close();
}
于 2013-02-27T10:10:31.177 回答
0

尝试这个，

if(cursor != null){
    cursor.moveToFirst();
    String label = cursor.getString(1);
}
于 2013-02-27T09:54:48.997 回答