Android（三）数据存储之三SQLite嵌入式数据库 3
在mail.xml所在目录里添加一个contactitem.xml：<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" android:layout_height="wrap_content">
<!-- contact.id -->
<TextView android:layout_width="30dip" android:layout_height="wrap_content"
android:textSize="20sp" android:id="@+id/tv_id" />
<!-- contact.name -->
<TextView android:layout_width="150dip" android:layout_height="wrap_content"
android:textSize="20sp" android:layout_toRightOf="@id/tv_id"
android:layout_alignTop="@id/tv_id" android:id="@+id/tv_name" />
<!-- contact.phone -->
<TextView android:layout_width="150dip" android:layout_height="wrap_content"
android:textSize="20sp" android:layout_toRightOf="@id/tv_name"
android:layout_alignTop="@id/tv_name" android:id="@+id/tv_phone" />
</RelativeLayout>
编辑AndroidSQLite类：
package com.changcheng.sqlite;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import com.changcheng.sqlite.R;
import com.changcheng.sqlite.entity.Contact;
import com.changcheng.sqlite.service.ContactsService;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;
public class AndroidSQLite extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 获取分页数据
ContactsService contactsService = new ContactsService(this);
List<Contact> contacts = contactsService.getScrollData(0, 3);
// 获取ListView
ListView lv = (ListView) this.findViewById(R.id.listView);
// 生成List<? extends Map<String, ?>>数据
List<HashMap<String, Object>> data = new ArrayList<HashMap<String, Object>>();
for (Contact contact : contacts) {
HashMap<String, Object> item = new HashMap<String, Object>();
item.put("_id", contact.get_id());
item.put("name", contact.getName());
item.put("phone", contact.getPhone());
data.add(item);
}
// 生成Adapter
SimpleAdapter adapter = new SimpleAdapter(this, data,
R.layout.contactitem, new String[] { "_id", "name", "phone" },
new int[] { R.id.tv_id, R.id.tv_name, R.id.tv_phone });
// 设置ListView适配器
lv.setAdapter(adapter);
// 为ListView添加事件
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
HashMap<String, Object> item = (HashMap<String, Object>) parent
.getItemAtPosition((int) id);
Toast.makeText(AndroidSQLite.this, item.get("name").toString(),
1).show();
}
});
}
}
上面编写的分页显示数据比较麻烦，Android为我们提供了一个SimpleCursorAdapter类。使用它可以方便的显示分页数据。将AndroidSQLite类修改为：
package com.changcheng.sqlite;
import com.changcheng.sqlite.R;
import com.changcheng.sqlite.service.ContactsService;
import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class AndroidSQLite extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// 获取分页数据
ContactsService contactsService = new ContactsService(this);
Cursor cursor = contactsService.getScrollDataCursor(0, 3);
// 获取ListView
ListView lv = (ListView) this.findViewById(R.id.listView);
// 创建Adapter
SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
R.layout.contactitem, cursor, new String[] { "_id", "name",
"phone" }, new int[] { R.id.tv_id, R.id.tv_name,
R.id.tv_phone });
// 设置ListView适配器
lv.setAdapter(adapter);
// 为ListView添加事件
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Cursor cursor = (Cursor) parent
.getItemAtPosition((int) position);
Toast.makeText(AndroidSQLite.this, cursor.getString(1), 1)
.show();
}
});
}
}
OK，在Android中的SQLite操作总结结束！
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