Android ListView简单实用
layout创建：
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
tools:context="com.example.person.MainActivity"
>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="@string/name"
/>
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="@string/sex"
/>
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="@string/age"
/>
</LinearLayout>
<ListView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/listView"
/>
</LinearLayout>
item.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:id="@+id/name"
/>
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:id="@+id/sex"
/>
<TextView
android:layout_width="100dp"
android:layout_height="wrap_content"
android:id="@+id/age"
/>
</LinearLayout>
UserDao 插入数据， 分页查询数据
/**
*
*/
package com.example.person.dao;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.nfc.Tag;
import android.os.Build.VERSION;
import android.util.Log;
/**
*
* @author baoxing.gbx
* @version $Id: DBopenHelper.java, v 0.1 2015年7月11日 下午9:39:03 baoxing.gbx Exp $
*/
public class DBopenHelper extends SQLiteOpenHelper{
/** 数据库名称 */
private static final String DB_NAME = "test.db";
private static final int VERSION = 1;
private static final String Tag = "DBopenHelper";
// 初始化数据库开启装置
public DBopenHelper(Context context) {
super(context, DB_NAME, null, VERSION);
// TODO Auto-generated constructor stub
}
//
@Override
public void onCreate(SQLiteDatabase db) {
Log.i(Tag, "onCreate 被调用");
db.execSQL("create table user (id integer primary key autoincrement, name varchar(20),sex varchar(20), age integer )");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.i(Tag, "onUpgrade 被调用");
db.execSQL("DROP TABLE IF EXISTS person");
onCreate(db);
}
}
/**
*
*/
package com.example.person.dao;
import java.util.ArrayList;
import java.util.List;
import android.annotation.SuppressLint;
import android.content.ContentValues;
import android.database.Cursor;
import com.example.person.vo.User;
/**
*
* @author baoxing.gbx
* @version $Id: UserDao.java, v 0.1 2015年7月11日 下午10:44:09 baoxing.gbx Exp $
*/
public class UserDao {
String tableName = "user";
DBopenHelper dbopenHelper;
public UserDao (DBopenHelper dBopenHelper) {
this.dbopenHelper = dBopenHelper;
}
public long save(User user) {
ContentValues values = new ContentValues();
values.put("name", user.getName());
values.put("sex", user.getSex());
values.put("age", user.getAge());
long result = dbopenHelper.getWritableDatabase().insert(tableName, null, values);
return result;
}
public List<User> queryPage(int startRow, int pageSize) {
String limit = startRow + "," + pageSize;
Cursor cursor = dbopenHelper.getReadableDatabase().query(tableName, null, null, null, null, null, null, limit);
List<User> users = new ArrayList<User>();
while (cursor.moveToNext()) {
User user = new User();
user.setId(cursor.getInt(cursor.getColumnIndex("id")));
user.setName(cursor.getString(cursor.getColumnIndex("name")));
user.setSex(cursor.getString(cursor.getColumnIndex("sex")));
user.setAge( cursor.getInt(cursor.getColumnIndex("age")));
users.add(user);
}
return users;
}
}
MainActivity显示数据
package com.example.person;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.SimpleCursorAdapter;
import com.example.person.dao.DBopenHelper;
import com.example.person.dao.UserDao;
import com.example.person.vo.User;
public class MainActivity extends ActionBarActivity {
private ListView listView;
private UserDao userDao ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = (ListView)findViewById(R.id.listView);
userDao = new UserDao(new DBopenHelper(this));
// 简单适配器
// show1();
// 简单适配器
show2();
}
/**
* 自定义是配置显示
*/
private void show2() {
List<User> users = userDao.queryPage(0, 20);
listView.setAdapter(new MyAdapter(this, users, R.layout.item));
}
/**
* 普通是配置适配ListView
*/
private void show1() {
List<User> users = userDao.queryPage(0, 20);
List<Map<String, Object>> data = new ArrayList<Map<String, Object>>();
for (User user : users) {
Map<String, Object> map = new HashMap<String, Object>();
map.put("name", user.getName());
map.put("sex", user.getSex());
map.put("age", user.getAge());
data.add(map);
}
SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
new String[] {"name", "sex", "age"}, new int[] {R.id.name, R.id.sex, R.id.age});
listView.setAdapter(adapter);
}
}
自定义适配器
package com.example.person;
import java.util.List;
import com.example.person.vo.User;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
public class MyAdapter extends BaseAdapter{
private List<User> users;
private int resource;
private LayoutInflater inflater;
public MyAdapter(Context context,List<User> users, int resource) {
super();
this.users = users;
this.resource = resource;
this.inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
public MyAdapter() {
super();
// TODO Auto-generated constructor stub
}
@Override
public int getCount() {
return users.size();
}
@Override
public Object getItem(int position) {
return users.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (null == convertView) {
convertView = inflater.inflate(resource, null);
}
( (TextView)convertView.findViewById(R.id.name)).setText(users.get(position).getName());
( (TextView)convertView.findViewById(R.id.sex)).setText(users.get(position).getSex());
( (TextView)convertView.findViewById(R.id.age)).setText(users.get(position).getAge()+"");
return convertView;
}
}
