Android ListView数据显示

package cn.itcast.db;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import cn.itcast.domain.Person;
import cn.itcast.service.PersonService;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class MainActivity extends Activity {
private PersonService personService;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

this.personService = new PersonService(this);

ListView listView = (ListView) this.findViewById(R.id.listView);
Cursor cursor = personService.getCursorScrollData(0, 5);
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this, R.layout.item, cursor,
new String[]{"_id", "name", "amount"}, new int[]{R.id.id, R.id.name, R.id.amount});
listView.setAdapter(adapter);
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ListView lView = (ListView)parent;
Cursor data = (Cursor)lView.getItemAtPosition(position);
int personid = data.getInt(data.getColumnIndex("_id"));
Toast.makeText(MainActivity.this, personid+"", 1).show();
}
});
/*
List<Person> persons = personService.getScrollData(0, 5);
List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
for(Person person : persons){
HashMap<String, Object> item = new HashMap<String, Object>();
item.put("id", person.getId());
item.put("name", person.getName());
item.put("amount", person.getAmount());
data.add(item);
}
SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
new String[]{"id", "name", "amount"}, new int[]{R.id.id, R.id.name, R.id.amount});
listView.setAdapter(adapter);

listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
ListView lView = (ListView)parent;
HashMap<String, Object> item = (HashMap<String, Object>)lView.getItemAtPosition(position);
Toast.makeText(MainActivity.this, item.get("id").toString(), 1).show();
}
});
*/

Button button = (Button) this.findViewById(R.id.insertbutton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ContentResolver contentResolver = getContentResolver();
Uri insertUri = Uri.parse("content://cn.itcast.providers.personprovider/person");
ContentValues values = new ContentValues();
values.put("name", "itcastliming");
values.put("amount", 100);
Uri uri = contentResolver.insert(insertUri, values);
Toast.makeText(MainActivity.this, "添加完成", 1).show();
}
});
}
}