Android数据存储之三SQLite嵌入式数据库(2)
5.编写测试类
编写一个针对ContactsService的测试类，测试ContactsService类中的各个方法是否正确。
package com.changcheng.sqlite.test;
import java.util.List;
import com.changcheng.sqlite.MyOpenHelper;
import com.changcheng.sqlite.entity.Contact;
import com.changcheng.sqlite.service.ContactsService;
import android.database.Cursor;
import android.test.AndroidTestCase;
import android.util.Log;
public class ContactsServiceTest extends AndroidTestCase {
private static final String TAG = "ContactsServiceTest";
// 测试创建表
public void testCreateTable() throws Throwable {
MyOpenHelper openHelper = new MyOpenHelper(this.getContext());
openHelper.getWritableDatabase();
}
// 测试save
public void testSave() throws Throwable {
ContactsService contactsService = new ContactsService(this.getContext());
Contact contact1 = new Contact(null, "tom", "13898679876");
Contact contact2 = new Contact(null, "lili", "13041094909");
Contact contact3 = new Contact(null, "jack", "13504258899");
Contact contact4 = new Contact(null, "heary", "1335789789");
contactsService.save(contact1);
contactsService.save(contact2);
contactsService.save(contact3);
contactsService.save(contact4);
}
// 测试find
public void testFind() throws Throwable {
ContactsService contactsService = new ContactsService(this.getContext());
Contact contact = contactsService.find(1);
Log.i(TAG, contact.toString());
}
// 测试update
public void testUpdate() throws Throwable {
ContactsService contactsService = new ContactsService(this.getContext());
Contact contact = contactsService.find(1);
contact.setPhone("1399889955");
contactsService.update(contact);
}
// 测试getCount
public void testGetCount() throws Throwable {
ContactsService contactsService = new ContactsService(this.getContext());
Log.i(TAG, contactsService.getCount() + "");
}
// 测试getScrollData
public void testGetScrollData() throws Throwable {
ContactsService contactsService = new ContactsService(this.getContext());
List<Contact> contacts = contactsService.getScrollData(0, 3);
Log.i(TAG, contacts.toString());
}
// 测试getScrollDataCursor
public void testGetScrollDataCursor() throws Throwable {
ContactsService contactsService = new ContactsService(this.getContext());
Cursor cursor = contactsService.getScrollDataCursor(0, 3);
while (cursor.moveToNext()) {
Contact contact = new Contact(cursor.getInt(0),
cursor.getString(1), cursor.getString(2));
Log.i(TAG, contact.toString());
}
}
}
启用测试功能，不要忘记在AndroidManifest.xml文件中加入测试环境。为application元素添加一个子元素：<uses-library android:name="android.test.runner"/>，为application元素添加一个兄弟元素：<instrumentation android:name="android.test.InstrumentationTestRunner" android:targetPackage="com.changcheng.sqlite" android:label="Tests for My App" />。
SQLite数据库以单个文件存储，就像微软的Access数据库。有一个查看SQLite数据库文件的工具——SQLite Developer，我们可以使用它来查看数据库。Android将创建的数据库存放在”/data/data/ com.changcheng.sqlite/databases/contacts”，我们将它导出然后使用SQLite Developer打开。
6.分页显示数据
我们在ContactsService类中，提供了一个获取分页数据的方法。我们将调用它获取的数据，使用ListView组件显示出来。
编辑mail.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<!-- ListView -->
<ListView android:layout_width="fill_parent"
android:layout_height="fill_parent" android:id="@+id/listView" />
</LinearLayout>
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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