1.定义DtatBase类：

package com.example.sqlitetest;

import android.content.Context;
import android.database.sqlite.sqliteDatabase;
import android.database.sqlite.sqliteOpenHelper;

public class Db extends sqliteOpenHelper {

	public Db(Context context) {
		super(context,"db",null,1);
	}

	@Override
	public void onCreate(sqliteDatabase arg0) {
		arg0.execsql("CREATE TABLE user("
				+ "_id INTEGER PRIMARY KEY AUTOINCREMENT,"
				+ "name TEXT DEFAULT \"\"," + "age INTEGER DEFAULT \"\")");
	}

	@Override
	public void onUpgrade(sqliteDatabase arg0,int arg1,int arg2) {
		// TODO Auto-generated method stub

	}

}

package com.example.sqlitetest;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.sqliteDatabase;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SimpleCursorAdapter;

public class MainActivity extends ListActivity {

	private SimpleCursorAdapter adapter;
	private Button btnAdd;
	private EditText etName,etAge;
	private Db db;
	private sqliteDatabase dbRead,dbWrite;
	private OnClickListener clickListener = new OnClickListener() {
		@Override
		public void onClick(View arg0) {
			ContentValues cv = new ContentValues();

			cv.put("name",etName.getText().toString());
			cv.put("age",Integer.parseInt(etAge.getText().toString()));

			dbWrite.insert("user",cv);

			refersh();
		}
	};

	private void refersh() {
		Cursor c = dbRead.query("user",null);
		adapter.changeCursor(c);
	}

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		etName = (EditText) findViewById(R.id.etName);
		etAge = (EditText) findViewById(R.id.etAge);
		btnAdd = (Button) findViewById(R.id.btnAdd);
		btnAdd.setOnClickListener(clickListener);

		db = new Db(this);
		dbRead = db.getReadableDatabase();
		dbWrite = db.getWritableDatabase();

		adapter = new SimpleCursorAdapter(this,R.layout.db_view,new String[] { "name","age" },new int[] { R.id.tvName,R.id.tvAge });
		setListAdapter(adapter);

		refersh();

		getListView().setOnItemLongClickListener(ListViewLongClickListenner);
	}

	private OnItemLongClickListener ListViewLongClickListenner = new OnItemLongClickListener() {

		@Override
		public boolean onItemLongClick(AdapterView<?> arg0,View arg1,final int arg2,long arg3) {

			new AlertDialog.Builder(MainActivity.this)
					.setTitle("提醒")
					.setMessage("确定删除选中项吗")
					.setPositiveButton("确定",new DialogInterface.OnClickListener() {
								@Override
								public void onClick(DialogInterface arg0,int arg1) {
									Cursor c = adapter.getCursor();
									c.moveToPosition(arg2);

									int itemId = c.getInt(c
											.getColumnIndex("_id"));
									dbWrite.delete("user","_id=?",new String[] { itemId + "" });
									refersh();
								}
							}).setNegativeButton("取消",null).show();
			return true;
		}
	};

}

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <ListView
        android:id="@android:id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" >
    </ListView>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="NAME:" />

        <EditText
            android:id="@+id/etName"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="AGE:" />

        <EditText
            android:id="@+id/etAge"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1" />

        <Button
            android:id="@+id/btnAdd"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="ADD" />
    </LinearLayout>

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tvName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Large Text"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <TextView
        android:id="@+id/tvAge"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Small Text"
        android:textAppearance="?android:attr/textAppearanceSmall" />

</LinearLayout>