【黑马Android】(04)数据库的创建和sql语句增删改查/LinearLayout展示列表数据/ListView的使用和BaseAdater/内容提供者创建

2022-06-06 15:19:09

数据库的创建和sql语句增删改查

1. 载入驱动.

2. 连接数据库.

3. 操作数据库.

创建表:

create table person(

_id integer primary key,

name varchar(20),

age integer

);

加入: insert into person(name, age) values('lisi', 19);

删除: delete from person where _id = 1;

改动: update person set name = '李四' where name = '王五';

查询全部: select * from person;

查询单条: select * from person where name = 'zhangsan';

SQLiteExpert3, pc上的工具软件。

package com.itheima28.sqlitedemo.dao;

import java.util.ArrayList;

import java.util.List;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper;

import com.itheima28.sqlitedemo.entities.Person;

public class PersonDao {

	private PersonSQLiteOpenHelper mOpenHelper;	// 数据库的帮助类对象

	public PersonDao(Context context) {

		mOpenHelper = new PersonSQLiteOpenHelper(context);

	}

	/**

	 * 加入到person表一条数据

	 * @param person

	 */

	public void insert(Person person) {

		SQLiteDatabase db = mOpenHelper.getWritableDatabase();

		if(db.isOpen()) {	// 假设数据库打开, 运行加入的操作

			// 运行加入到数据库的操作

			db.execSQL("insert into person(name, age) values(?

, ?);", new Object[]{person.getName(), person.getAge()});

			db.close();	// 数据库关闭

		}

	}

	/**

	 * 更据id删除记录

	 * @param id

	 */

	public void delete(int id) {

		SQLiteDatabase db = mOpenHelper.getWritableDatabase();	// 获得可写的数据库对象

		if(db.isOpen()) {	// 假设数据库打开, 运行加入的操作

			db.execSQL("delete from person where _id = ?;", new Integer[]{id});

			db.close();	// 数据库关闭

		}

	}

	/**

	 * 依据id找到记录, 而且改动姓名

	 * @param id

	 * @param name

	 */

	public void update(int id, String name) {

		SQLiteDatabase db = mOpenHelper.getWritableDatabase();

		if(db.isOpen()) {	// 假设数据库打开, 运行加入的操作

			db.execSQL("update person set name = ? where _id = ?;", new Object[]{name, id});

			db.close();	// 数据库关闭

		}

	}

	public List<Person> queryAll() {

		SQLiteDatabase db = mOpenHelper.getReadableDatabase();	// 获得一个仅仅读的数据库对象

		if(db.isOpen()) {

			Cursor cursor = db.rawQuery("select _id, name, age from person;", null);

			if(cursor != null && cursor.getCount() > 0) {

				List<Person> personList = new ArrayList<Person>();

				int id;

				String name;

				int age;

				while(cursor.moveToNext()) {

					id = cursor.getInt(0);	// 取第0列的数据 id

					name = cursor.getString(1);	// 取姓名

					age = cursor.getInt(2);		// 取年龄

					personList.add(new Person(id, name, age));

				}

				db.close();

				return personList;

			}

			db.close();

		}

		return null;

	}

	/**

	 * 依据id查询人

	 * @param id

	 * @return

	 */

	public Person queryItem(int id) {

		SQLiteDatabase db = mOpenHelper.getReadableDatabase();	// 获得一个仅仅读的数据库对象

		if(db.isOpen()) {

			Cursor cursor = db.rawQuery("select _id, name, age from person where _id = ?

;", new String[]{id + ""});

			if(cursor != null && cursor.moveToFirst()) {

				int _id = cursor.getInt(0);

				String name = cursor.getString(1);

				int age = cursor.getInt(2);

				db.close();

				return new Person(_id, name, age);

			}

			db.close();

		}

		return null;

	}

}

package com.itheima28.sqlitedemo.db;

import android.content.Context;

import android.database.sqlite.SQLiteDatabase;

import android.database.sqlite.SQLiteDatabase.CursorFactory;

import android.database.sqlite.SQLiteOpenHelper;

import android.util.Log;

/**

 * @author andong

 * 数据库帮助类, 用于创建和管理数据库的.

 */

public class PersonSQLiteOpenHelper extends SQLiteOpenHelper {

	private static final String TAG = "PersonSQLiteOpenHelper";

	/**

	 * 数据库的构造函数

	 * @param context

	 *

	 * name 数据库名称

	 * factory 游标project

	 * version 数据库的版本 不能够小于1

	 */

	public PersonSQLiteOpenHelper(Context context) {

		super(context, "itheima28.db", null, 2);

	}

	/**

	 * 数据库第一次创建时回调此方法.

	 * 初始化一些表

	 */

	@Override

	public void onCreate(SQLiteDatabase db) {

		// 操作数据库

		String sql = "create table person(_id integer primary key, name varchar(20), age integer);";

		db.execSQL(sql);		// 创建person表

	}

	/**

	 * 数据库的版本更新时回调此方法,

	 * 更新数据库的内容(删除表, 加入表, 改动表)

	 */

	@Override

	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

		if(oldVersion == 1 && newVersion == 2) {

			Log.i(TAG, "数据库更新啦");

			// 在person表中加入一个剩余金额列balance

			db.execSQL("alter table person add balance integer;");

		}

	}

}

package com.itheima28.sqlitedemo.entities;

public class Person {

	private int id;

	private String name;

	private int age;

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	public int getAge() {

		return age;

	}

	public void setAge(int age) {

		this.age = age;

	}

	public Person() {

		super();

		// TODO Auto-generated constructor stub

	}

	public Person(int id, String name, int age) {

		super();

		this.id = id;

		this.name = name;

		this.age = age;

	}

	@Override

	public String toString() {

		return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";

	}

}

package com.itheima28.sqlitedemo.test;

import java.util.List;

import com.itheima28.sqlitedemo.dao.PersonDao;

import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper;

import com.itheima28.sqlitedemo.entities.Person;

import android.database.SQLException;

import android.database.sqlite.SQLiteDatabase;

import android.test.AndroidTestCase;

import android.util.Log;

public class TestCase extends AndroidTestCase {

	private static final String TAG = "TestCase";

	public void test() {

		// 数据库什么时候创建

		PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext());

		// 第一次连接数据库时创建数据库文件. onCreate会被调用

		openHelper.getReadableDatabase();

	}

	public void testInsert() {

		PersonDao dao = new PersonDao(getContext());

		dao.insert(new Person(0, "冠希", 28));

	}

	public void testDelete() {

		PersonDao dao = new PersonDao(getContext());

		dao.delete(1);

	}

	public void testUpdate() {

		PersonDao dao = new PersonDao(getContext());

		dao.update(3, "凤姐");

	}

	public void testQueryAll() {

		PersonDao dao = new PersonDao(getContext());

		List<Person> personList = dao.queryAll();

		for (Person person : personList) {

			Log.i(TAG, person.toString());

		}

	}

	public void testQueryItem() {

		PersonDao dao = new PersonDao(getContext());

		Person person = dao.queryItem(4);

		Log.i(TAG, person.toString());

	}

	public void testTransaction() {

		PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext());

		SQLiteDatabase db = openHelper.getWritableDatabase();

		if(db.isOpen()) {

			try {

				// 开启事务

				db.beginTransaction();

				// 1. 从张三账户中扣1000块钱

				db.execSQL("update person set balance = balance - 1000 where name = 'zhangsan';");

				// ATM机, 挂掉了.

				// int result = 10 / 0;

				// 2. 向李四账户中加1000块钱

				db.execSQL("update person set balance = balance + 1000 where name = 'lisi';");

				// 标记事务成功

				db.setTransactionSuccessful();

			} finally {

				// 停止事务

				db.endTransaction();

			}

			db.close();

		}

	}

	public void testTransactionInsert() {

		PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext());

		SQLiteDatabase db = openHelper.getWritableDatabase();

		if(db.isOpen()) {

			// 1. 记住当前的时间

			long start = System.currentTimeMillis();

			// 2. 開始加入数据

			try {

				db.beginTransaction();

				for (int i = 0; i < 10000; i++) {

					db.execSQL("insert into person(name, age, balance) values('wang" + i + "', " + (10 + i) + ", " + (10000 + i) + ")");

				}

				db.setTransactionSuccessful();

			} finally {

				db.endTransaction();

			}

			// 3. 记住结束时间, 计算耗时时间

			long end = System.currentTimeMillis();

			long diff = end - start;

			Log.i(TAG, "耗时: " + diff + "毫秒");

			db.close();

		}

	}

}

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.itheima28.sqlitedemo"

    android:versionCode="1"

    android:versionName="1.0" >

    <instrumentation

        android:name="android.test.InstrumentationTestRunner"

        android:targetPackage="com.itheima28.sqlitedemo" >

    </instrumentation>

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <uses-library android:name="android.test.runner" />

        <activity

            android:name="com.itheima28.sqlitedemo.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

使用api方式查询数据库和sqlite3工具

adb shell

package com.itheima28.sqlitedemo.dao;

import java.util.ArrayList;

import java.util.List;

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.util.Log;

import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper;

import com.itheima28.sqlitedemo.entities.Person;

public class PersonDao2 {

	private static final String TAG = "PersonDao2";

	private PersonSQLiteOpenHelper mOpenHelper;	// 数据库的帮助类对象

	public PersonDao2(Context context) {

		mOpenHelper = new PersonSQLiteOpenHelper(context);

	}

	/**

	 * 加入到person表一条数据

	 * @param person

	 */

	public void insert(Person person) {

		SQLiteDatabase db = mOpenHelper.getWritableDatabase();

		if(db.isOpen()) {	// 假设数据库打开, 运行加入的操作

			ContentValues values = new ContentValues();

			values.put("name", person.getName());		// key作为要存储的列名, value对象列的值

			values.put("age", person.getAge());

			long id = db.insert("person", "name", values);

			Log.i(TAG, "id: " + id);

			db.close();	// 数据库关闭

		}

	}

	/**

	 * 更据id删除记录

	 * @param id

	 */

	public void delete(int id) {

		SQLiteDatabase db = mOpenHelper.getWritableDatabase();	// 获得可写的数据库对象

		if(db.isOpen()) {	// 假设数据库打开, 运行加入的操作

			String whereClause = "_id = ?";

			String[] whereArgs = {id + ""};

			int count = db.delete("person", whereClause, whereArgs);

			Log.i(TAG, "删除了: " + count + "行");

			db.close();	// 数据库关闭

		}

	}

	/**

	 * 依据id找到记录, 而且改动姓名

	 * @param id

	 * @param name

	 */

	public void update(int id, String name) {

		SQLiteDatabase db = mOpenHelper.getWritableDatabase();

		if(db.isOpen()) {	// 假设数据库打开, 运行加入的操作

			ContentValues values = new ContentValues();

			values.put("name", name);

			int count  = db.update("person", values, "_id = ?", new String[]{id + ""});

			Log.i(TAG, "改动了: " + count + "行");

			db.close();	// 数据库关闭

		}

	}

	public List<Person> queryAll() {

		SQLiteDatabase db = mOpenHelper.getReadableDatabase();	// 获得一个仅仅读的数据库对象

		if(db.isOpen()) {

			String[] columns = {"_id", "name", "age"};	// 须要的列

			String selection = null;	// 选择条件, 给null查询全部

			String[] selectionArgs = null;	// 选择条件的參数, 会把选择条件中的? 替换成数据中的值

			String groupBy = null;	// 分组语句  group by name

			String having = null;	// 过滤语句

			String orderBy = null;	// 排序

			Cursor cursor = db.query("person", columns, selection, selectionArgs, groupBy, having, orderBy);

			int id;

			String name;

			int age;

			if(cursor != null && cursor.getCount() > 0) {

				List<Person> personList = new ArrayList<Person>();

				while(cursor.moveToNext()) {	// 向下移一位, 知道最后一位, 不能够往下移动了, 停止.

					id = cursor.getInt(0);

					name = cursor.getString(1);

					age = cursor.getInt(2);

					personList.add(new Person(id, name, age));

				}

				db.close();

				return personList;

			}

			db.close();

		}

		return null;

	}

	/**

	 * 依据id查询人

	 * @param id

	 * @return

	 */

	public Person queryItem(int id) {

		SQLiteDatabase db = mOpenHelper.getReadableDatabase();	// 获得一个仅仅读的数据库对象

		if(db.isOpen()) {

			String[] columns = {"_id", "name", "age"};	// 须要的列

			String selection = "_id = ?

";	// 选择条件, 给null查询全部

			String[] selectionArgs = {id + ""};	// 选择条件的參数, 会把选择条件中的? 替换成数据中的值

			String groupBy = null;	// 分组语句  group by name

			String having = null;	// 过滤语句

			String orderBy = null;	// 排序

			Cursor cursor = db.query("person", columns, selection, selectionArgs, groupBy, having, orderBy);

			if(cursor != null && cursor.moveToFirst()) {		// cursor对象不为null, 而且能够移动到第一行

				int _id = cursor.getInt(0);

				String name = cursor.getString(1);

				int age = cursor.getInt(2);

				db.close();

				return new Person(_id, name, age);

			}

			db.close();

		}

		return null;

	}

}

package com.itheima28.sqlitedemo.test;

import java.util.List;

import android.test.AndroidTestCase;

import android.util.Log;

import com.itheima28.sqlitedemo.dao.PersonDao2;

import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper;

import com.itheima28.sqlitedemo.entities.Person;

public class TestCase2 extends AndroidTestCase {

	private static final String TAG = "TestCase";

	public void test() {

		// 数据库什么时候创建

		PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext());

		// 第一次连接数据库时创建数据库文件. onCreate会被调用

		openHelper.getReadableDatabase();

	}

	public void testInsert() {

		PersonDao2 dao = new PersonDao2(getContext());

		dao.insert(new Person(0, "zhouqi", 88));

	}

	public void testDelete() {

		PersonDao2 dao = new PersonDao2(getContext());

		dao.delete(8);

	}

	public void testUpdate() {

		PersonDao2 dao = new PersonDao2(getContext());

		dao.update(3, "fengjie");

	}

	public void testQueryAll() {

		PersonDao2 dao = new PersonDao2(getContext());

		List<Person> personList = dao.queryAll();

		for (Person person : personList) {

			Log.i(TAG, person.toString());

		}

	}

	public void testQueryItem() {

		PersonDao2 dao = new PersonDao2(getContext());

		Person person = dao.queryItem(4);

		Log.i(TAG, person.toString());

	}

}

事务的操作

事务:

update person set balance = balance - 100 where name = 'lisi';

update person set balance = balance + 100 where name = 'zhangsan';

// 开启事务

db.beginTransaction();

// 标记事务成功

db.setTransactionSuccessful();

// 停止事务

db.endTransaction();

	public void testTransaction() {

		PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext());

		SQLiteDatabase db = openHelper.getWritableDatabase();

		if(db.isOpen()) {

			try {

				// 开启事务

				db.beginTransaction();

				// 1. 从张三账户中扣1000块钱

				db.execSQL("update person set balance = balance - 1000 where name = 'zhangsan';");

				// ATM机, 挂掉了.

				// int result = 10 / 0;

				// 2. 向李四账户中加1000块钱

				db.execSQL("update person set balance = balance + 1000 where name = 'lisi';");

				// 标记事务成功

				db.setTransactionSuccessful();

			} finally {

				// 停止事务

				db.endTransaction();

			}

			db.close();

		}

	}

	public void testTransactionInsert() {

		PersonSQLiteOpenHelper openHelper = new PersonSQLiteOpenHelper(getContext());

		SQLiteDatabase db = openHelper.getWritableDatabase();

		if(db.isOpen()) {

			// 1. 记住当前的时间

			long start = System.currentTimeMillis();

			// 2. 開始加入数据

			try {

				db.beginTransaction();

				for (int i = 0; i < 10000; i++) {

					db.execSQL("insert into person(name, age, balance) values('wang" + i + "', " + (10 + i) + ", " + (10000 + i) + ")");

				}

				db.setTransactionSuccessful();

			} finally {

				db.endTransaction();

			}

			// 3. 记住结束时间, 计算耗时时间

			long end = System.currentTimeMillis();

			long diff = end - start;

			Log.i(TAG, "耗时: " + diff + "毫秒");

			db.close();

		}

	}

LinearLayout展示列表数据

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <LinearLayout

        android:id="@+id/ll_list"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:orientation="vertical" >

    </LinearLayout>

</ScrollView>

package com.itheima28.sqlitedemo;

import java.util.List;

import com.itheima28.sqlitedemo.dao.PersonDao;

import com.itheima28.sqlitedemo.entities.Person;

import android.os.Bundle;

import android.app.Activity;

import android.view.Menu;

import android.view.View;

import android.widget.LinearLayout;

import android.widget.TextView;

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        LinearLayout llList = (LinearLayout) findViewById(R.id.ll_list);

        PersonDao dao = new PersonDao(this);

        List<Person> personList = dao.queryAll();

        if(personList != null) {

	        TextView tv;

	        for (Person person : personList) {

				// 向线性布局中加入一个textview

	        	tv = new TextView(this);

	        	tv.setText(person.toString());

	        	tv.setTextSize(18);

	        	llList.addView(tv);

			}

        }

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

}

ListView的使用和BaseAdater

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical" >

    <ListView

        android:id="@+id/listview"

        android:layout_width="match_parent"

        android:layout_height="match_parent" >

    </ListView>

</LinearLayout>

package com.itheima28.sqlitedemo;

import java.util.List;

import com.itheima28.sqlitedemo.dao.PersonDao;

import com.itheima28.sqlitedemo.entities.Person;

import android.os.Bundle;

import android.app.Activity;

import android.util.Log;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.TextView;

public class MainActivity extends Activity {

    private List<Person> personList;

	@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ListView mListView = (ListView) findViewById(R.id.listview);

        PersonDao dao = new PersonDao(this);

        personList = dao.queryAll();

        // 把view层对象ListView和控制器BaseAdapter关联起来

        mListView.setAdapter(new MyAdapter());

    }

    /**

     * @author andong

     * 数据适配器

     */

    class MyAdapter extends BaseAdapter {

    	private static final String TAG = "MyAdapter";

		/**

    	 * 定义ListView的数据的长度

    	 */

		@Override

		public int getCount() {

			return personList.size();

		}

		@Override

		public Object getItem(int position) {

			// TODO Auto-generated method stub

			return null;

		}

		@Override

		public long getItemId(int position) {

			// TODO Auto-generated method stub

			return 0;

		}

		/**

		 * 此方法返回的是ListView的列表中某一行的View对象

		 * position 当前返回的view的索引位置

		 * convertView 缓存对象

		 * parent 就是ListView对象

		 */

		@Override

		public View getView(int position, View convertView, ViewGroup parent) {

			TextView tv = null;			

			if(convertView != null) {		// 推断缓存对象是否为null,  不为null时已经缓存了对象

				Log.i(TAG, "getView: 复用缓存" + position);

				tv = (TextView) convertView;

			} else {	// 等于null, 说明第一次显示, 新创建

				Log.i(TAG, "getView: 新建" + position);

				tv = new TextView(MainActivity.this);

			}

			tv.setTextSize(25);

			Person person = personList.get(position); // 获得指定位置的数据, 进行对TextView的绑定

			tv.setText(person.toString());

			return tv;

		}

    }

}

package com.itheima28.sqlitedemo;

import java.util.List;

import com.itheima28.sqlitedemo.dao.PersonDao;

import com.itheima28.sqlitedemo.entities.Person;

import android.os.Bundle;

import android.app.Activity;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.TextView;

public class MainActivity2 extends Activity {

    private List<Person> personList;

	@Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        ListView mListView = (ListView) findViewById(R.id.listview);

        PersonDao dao = new PersonDao(this);

        personList = dao.queryAll();

        // 把view层对象ListView和控制器BaseAdapter关联起来

        mListView.setAdapter(new MyAdapter());

    }

    /**

     * @author andong

     * 数据适配器

     */

    class MyAdapter extends BaseAdapter {

    	private static final String TAG = "MyAdapter";

		/**

    	 * 定义ListView的数据的长度

    	 */

		@Override

		public int getCount() {

			return personList.size();

		}

		@Override

		public Object getItem(int position) {

			// TODO Auto-generated method stub

			return null;

		}

		@Override

		public long getItemId(int position) {

			// TODO Auto-generated method stub

			return 0;

		}

		/**

		 * 此方法返回的是ListView的列表中某一行的View对象

		 * position 当前返回的view的索引位置

		 * convertView 缓存对象

		 * parent 就是ListView对象

		 */

		@Override

		public View getView(int position, View convertView, ViewGroup parent) {

			View view = null;

			if(convertView == null) {

				// 布局填充器对象, 用于把xml布局转换成view对象

				LayoutInflater inflater = MainActivity2.this.getLayoutInflater();

				view = inflater.inflate(R.layout.listview_item, null);

			} else {

				view = convertView;

			}

			// 给view中的姓名和年龄赋值

			TextView tvName = (TextView) view.findViewById(R.id.tv_listview_item_name);

			TextView tvAge = (TextView) view.findViewById(R.id.tv_listview_item_age);

			Person person = personList.get(position);

			tvName.setText("姓名: " + person.getName());

			tvAge.setText("年龄: " + person.getAge());

			return view;

		}

    }

}

listview_item.xml

<?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="wrap_content"

    android:orientation="horizontal"

    android:padding="10dip" >

    <ImageView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/f078" />

    <LinearLayout

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:layout_marginLeft="10dip"

        android:orientation="vertical" >

        <TextView

            android:id="@+id/tv_listview_item_name"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:text="张三" />

        <TextView

            android:id="@+id/tv_listview_item_age"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_marginTop="5dip"

            android:textColor="#FF0000"

            android:text="35" />

    </LinearLayout>

</LinearLayout>

其它两种绑定ListView数据的方式

<RelativeLayout 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"

    tools:context=".MainActivity" >

    <ListView

        android:id="@+id/listview"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

</RelativeLayout>

listview_item.xml

<?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="wrap_content"

    android:gravity="center_vertical"

    android:orientation="horizontal"

    android:padding="10dip" >

    <ImageView

        android:id="@+id/iv_icon"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/f007" />

    <TextView

        android:id="@+id/tv_name"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginLeft="10dip"

        android:text="张三"

        android:textColor="#FF0000"

        android:textSize="23sp" />

</LinearLayout>

package com.itheima28.simpleadapterdemo;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import android.app.Activity;

import android.os.Bundle;

import android.view.Menu;

import android.widget.ArrayAdapter;

import android.widget.ListView;

import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		ListView mListView = (ListView) findViewById(R.id.listview);

		List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();

		Map<String, Object> map = new HashMap<String, Object>();

		map.put("name", "张三1");

		map.put("icon", R.drawable.f007);

		data.add(map);

		map = new HashMap<String, Object>();

		map.put("name", "张三2");

		map.put("icon", R.drawable.f007);

		data.add(map);

		map = new HashMap<String, Object>();

		map.put("name", "张三3");

		map.put("icon", R.drawable.f007);

		data.add(map);

		map = new HashMap<String, Object>();

		map.put("name", "张三4");

		map.put("icon", R.drawable.f007);

		data.add(map);

		map = new HashMap<String, Object>();

		map.put("name", "张三5");

		map.put("icon", R.drawable.f007);

		data.add(map);

		SimpleAdapter adapter = new SimpleAdapter(

				this, // 上下文

				data, // listView绑定的数据

				R.layout.listview_item, // listview的子条目的布局的id

				new String[]{"name", "icon"}, 	// data数据中的map集合里的key

				new int[]{R.id.tv_name, R.id.iv_icon}); // resource 中的id

		mListView.setAdapter(adapter);

	}

	@Override

	public boolean onCreateOptionsMenu(Menu menu) {

		// Inflate the menu; this adds items to the action bar if it is present.

		getMenuInflater().inflate(R.menu.main, menu);

		return true;

	}

}

内容提供者创建

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.itheima28.sqlitedemo"

    android:versionCode="1"

    android:versionName="1.0" >

    <instrumentation

        android:name="android.test.InstrumentationTestRunner"

        android:targetPackage="com.itheima28.sqlitedemo" >

    </instrumentation>

    <permission android:name="aa.bb.cc.read" ></permission>

    <permission android:name="aa.bb.cc.write" ></permission>

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <uses-library android:name="android.test.runner" />

        <activity

            android:name="com.itheima28.sqlitedemo.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <provider

            android:name=".providers.PersonContentProvider"

            android:authorities="com.itheima28.sqlitedemo.providers.PersonContentProvider"

            android:readPermission="aa.bb.cc.read"

            android:writePermission="aa.bb.cc.write" >

        </provider>

    </application>

</manifest>

package com.itheima28.sqlitedemo.providers;

import com.itheima28.sqlitedemo.db.PersonSQLiteOpenHelper;

import android.content.ContentProvider;

import android.content.ContentUris;

import android.content.ContentValues;

import android.content.UriMatcher;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.net.Uri;

public class PersonContentProvider extends ContentProvider {

	private static final String AUTHORITY = "com.itheima28.sqlitedemo.providers.PersonContentProvider";

	private static final int PRESON_INSERT_CODE = 0;	// 操作person表加入的操作的uri匹配码

	private static final int PERSON_DELETE_CODE = 1;

	private static final int PERSON_UPDATE_CODE = 2;

	private static final int PERSON_QUERY_ALL_CODE = 3;

	private static final int PERSON_QUERY_ITEM_CODE = 4;

	private static UriMatcher uriMatcher;

	private PersonSQLiteOpenHelper mOpenHelper;		// person表的数据库帮助对象

	static {

		uriMatcher = new UriMatcher(UriMatcher.NO_MATCH);

		// 加入一些uri(分机号)

		// content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/insert

		uriMatcher.addURI(AUTHORITY, "person/insert", PRESON_INSERT_CODE);

		// content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/delete

		uriMatcher.addURI(AUTHORITY, "person/delete", PERSON_DELETE_CODE);

		// content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/update

		uriMatcher.addURI(AUTHORITY, "person/update", PERSON_UPDATE_CODE);

		// content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/queryAll

		uriMatcher.addURI(AUTHORITY, "person/queryAll", PERSON_QUERY_ALL_CODE);

		// content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/query/#

		uriMatcher.addURI(AUTHORITY, "person/query/#", PERSON_QUERY_ITEM_CODE);

	}

	@Override

	public boolean onCreate() {

		mOpenHelper = new PersonSQLiteOpenHelper(getContext());

		return true;

	}

	@Override

	public Cursor query(Uri uri, String[] projection, String selection,

			String[] selectionArgs, String sortOrder) {

		SQLiteDatabase db = mOpenHelper.getReadableDatabase();

		switch (uriMatcher.match(uri)) {

		case PERSON_QUERY_ALL_CODE:  // 查询全部人的uri

			if(db.isOpen()) {

				Cursor cursor = db.query("person", projection, selection, selectionArgs, null, null, sortOrder);

				return cursor;

				// db.close(); 返回cursor结果集时, 不能够关闭数据库

			}

			break;

		case PERSON_QUERY_ITEM_CODE:		// 查询的是单条数据, uri末尾出有一个id

			if(db.isOpen()) {

				long id = ContentUris.parseId(uri);

				Cursor cursor = db.query("person", projection, "_id = ?", new String[]{id + ""}, null, null, sortOrder);

				return cursor;

			}

			break;

		default:

			throw new IllegalArgumentException("uri不匹配: " + uri);

		}

		return null;

	}

	@Override

	public String getType(Uri uri) {

		switch (uriMatcher.match(uri)) {

		case PERSON_QUERY_ALL_CODE: // 返回多条的MIME-type

			return "vnd.android.cursor.dir/person";

		case PERSON_QUERY_ITEM_CODE: // 返回单条的MIME-TYPE

			return "vnd.android.cursor.item/person";

		default:

			break;

		}

		return null;

	}

	@Override

	public Uri insert(Uri uri, ContentValues values) {

		switch (uriMatcher.match(uri)) {

		case PRESON_INSERT_CODE:	// 加入人到person表中

			SQLiteDatabase db = mOpenHelper.getWritableDatabase();

			if(db.isOpen()) {

				long id = db.insert("person", null, values);

				db.close();

				return ContentUris.withAppendedId(uri, id);

			}

			break;

		default:

			throw new IllegalArgumentException("uri不匹配: " + uri);

		}

		return null;

	}

	@Override

	public int delete(Uri uri, String selection, String[] selectionArgs) {

		switch (uriMatcher.match(uri)) {

		case PERSON_DELETE_CODE:	// 在person表中删除数据的操作

			SQLiteDatabase db = mOpenHelper.getWritableDatabase();

			if(db.isOpen()) {

				int count = db.delete("person", selection, selectionArgs);

				db.close();

				return count;

			}

			break;

		default:

			throw new IllegalArgumentException("uri不匹配: " + uri);

		}

		return 0;

	}

	@Override

	public int update(Uri uri, ContentValues values, String selection,

			String[] selectionArgs) {

		switch (uriMatcher.match(uri)) {

		case PERSON_UPDATE_CODE: // 更新person表的操作

			SQLiteDatabase db = mOpenHelper.getWritableDatabase();

			if(db.isOpen()) {

				int count = db.update("person", values, selection, selectionArgs);

				db.close();

				return count;

			}

			break;

		default:

			throw new IllegalArgumentException("uri不匹配: " + uri);

		}

		return 0;

	}

}

内容提供者訪问和权限

<?

xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.itheima28.othercontentprovider"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

    <instrumentation

        android:name="android.test.InstrumentationTestRunner"

        android:targetPackage="com.itheima28.othercontentprovider" >

    </instrumentation>

    <uses-permission android:name="aa.bb.cc.read"/>

    <uses-permission android:name="aa.bb.cc.write"/>

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <uses-library android:name="android.test.runner" />

        <activity

            android:name="com.itheima28.othercontentprovider.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

package com.itheima28.othercontentprovider;

import android.content.ContentResolver;

import android.content.ContentUris;

import android.content.ContentValues;

import android.database.Cursor;

import android.net.Uri;

import android.test.AndroidTestCase;

import android.util.Log;

public class TextCase extends AndroidTestCase {

	private static final String TAG = "TextCase";

	public void testInsert() {

		Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/insert");

		// 内容提供者訪问对象

		ContentResolver resolver = getContext().getContentResolver();

		ContentValues values = new ContentValues();

		values.put("name", "fengjie");

		values.put("age", 90);

		uri = resolver.insert(uri, values);

		Log.i(TAG, "uri: " + uri);

		long id = ContentUris.parseId(uri);

		Log.i(TAG, "加入到: " + id);

	}

	public void testDelete() {

		Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/delete");

		// 内容提供者訪问对象

		ContentResolver resolver = getContext().getContentResolver();

		String where = "_id = ?

";

		String[] selectionArgs = {"21"};

		int count = resolver.delete(uri, where, selectionArgs);

		Log.i(TAG, "删除行: " + count);

	}

	public void testUpdate() {

		Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/update");

		// 内容提供者訪问对象

		ContentResolver resolver = getContext().getContentResolver();

		ContentValues values = new ContentValues();

		values.put("name", "lisi");

		int count = resolver.update(uri, values, "_id = ?", new String[]{"20"});

		Log.i(TAG, "更新行: " + count);

	}

	public void testQueryAll() {

		Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/queryAll");

		// 内容提供者訪问对象

		ContentResolver resolver = getContext().getContentResolver();

		Cursor cursor = resolver.query(uri, new String[]{"_id", "name", "age"}, null, null, "_id desc");

		if(cursor != null && cursor.getCount() > 0) {

			int id;

			String name;

			int age;

			while(cursor.moveToNext()) {

				id = cursor.getInt(0);

				name = cursor.getString(1);

				age = cursor.getInt(2);

				Log.i(TAG, "id: " + id + ", name: " + name + ", age: " + age);

			}

			cursor.close();

		}

	}

	public void testQuerySingleItem() {

		Uri uri = Uri.parse("content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/query/#");

		// 在uri的末尾加入一个id content://com.itheima28.sqlitedemo.providers.PersonContentProvider/person/query/20

		uri = ContentUris.withAppendedId(uri, 20);

		// 内容提供者訪问对象

		ContentResolver resolver = getContext().getContentResolver();

		Cursor cursor = resolver.query(uri, new String[]{"_id", "name", "age"}, null, null, null);

		if(cursor != null && cursor.moveToFirst()) {

			int id = cursor.getInt(0);

			String name = cursor.getString(1);

			int age = cursor.getInt(2);

			cursor.close();

			Log.i(TAG, "id: " + id + ", name: " + name + ", age: " + age);

		}

	}

}

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