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。
packagecom.changcheng.sqlite.test;
importjava.util.List;
importcom.changcheng.sqlite.MyOpenHelper;
importcom.changcheng.sqlite.entity.Contact;
importcom.changcheng.sqlite.service.ContactsService;
importandroid.database.Cursor;
importandroid.test.AndroidTestCase;
importandroid.util.Log;
publicclassContactsServiceTestextendsAndroidTestCase {
privatestaticfinalStringTAG="ContactsServiceTest";
//测试创建表
publicvoidtestCreateTable()throwsThrowable {
MyOpenHelper openHelper =newMyOpenHelper(this.getContext());
openHelper.getWritableDatabase();
}
//测试save
publicvoidtestSave()throwsThrowable {
ContactsService contactsService =newContactsService(this.getContext());
Contact contact1 =newContact(null,"tom","13898679876");
Contact contact2 =newContact(null,"lili","13041094909");
Contact contact3 =newContact(null,"jack","13504258899");
Contact contact4 =newContact(null,"heary","1335789789");
contactsService.save(contact1);
contactsService.save(contact2);
contactsService.save(contact3);
contactsService.save(contact4);
}
//测试find
publicvoidtestFind()throwsThrowable {
ContactsService contactsService =newContactsService(this.getContext());
Contact contact = contactsService.find(1);
Log.i(TAG, contact.toString());
}
//测试update
publicvoidtestUpdate()throwsThrowable {
ContactsService contactsService =newContactsService(this.getContext());
Contact contact = contactsService.find(1);
contact.setPhone("1399889955");
contactsService.update(contact);
}
//测试getCount
publicvoidtestGetCount()throwsThrowable {
ContactsService contactsService =newContactsService(this.getContext());
Log.i(TAG, contactsService.getCount() +"");
}
//测试getScrollData
publicvoidtestGetScrollData()throwsThrowable {
ContactsService contactsService =newContactsService(this.getContext());
List<Contact> contacts = contactsService.getScrollData(0, 3);
Log.i(TAG, contacts.toString());
}
//测试getScrollDataCursor
publicvoidtestGetScrollDataCursor()throwsThrowable {
ContactsService contactsService =newContactsService(this.getContext());
Cursor cursor = contactsService.getScrollDataCursor(0, 3);
while(cursor.moveToNext()) {
Contact contact =newContact(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：
<?xmlversion="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"android:layout_width="fill_parent"
android:layout_height="fill_parent">
<!-- ListView -->
<ListViewandroid: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：
<?xmlversion="1.0"encoding="utf-8"?>
<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"android:layout_height="wrap_content">
<!-- contact.id -->
<TextViewandroid:layout_width="30dip"android:layout_height="wrap_content"
android:textSize="20sp"android:id="@+id/tv_id"/>
<!-- contact.name -->
<TextViewandroid: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 -->
<TextViewandroid: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：
packagecom.changcheng.sqlite;
importjava.util.ArrayList;
importjava.util.HashMap;
importjava.util.List;
importcom.changcheng.sqlite.R;
importcom.changcheng.sqlite.entity.Contact;
importcom.changcheng.sqlite.service.ContactsService;
importandroid.app.Activity;
importandroid.database.Cursor;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.widget.AdapterView;
importandroid.widget.ListView;
importandroid.widget.SimpleAdapter;
importandroid.widget.Toast;
importandroid.widget.AdapterView.OnItemClickListener;
publicclassAndroidSQLiteextendsActivity {
/** Called when the activity is first created. */
@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获取分页数据
ContactsService contactsService =newContactsService(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 =newArrayList<HashMap<String, Object>>();
for(Contact contact : contacts) {
HashMap<String, Object> item =newHashMap<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 =newSimpleAdapter(this, data,
R.layout.contactitem,newString[] {"_id","name","phone"},
newint[] { 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(newOnItemClickListener() {
@Override
publicvoidonItemClick(AdapterView<?> parent, View view,
intposition,longid) {
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：
packagecom.changcheng.sqlite;
importcom.changcheng.sqlite.R;
importcom.changcheng.sqlite.service.ContactsService;
importandroid.app.Activity;
importandroid.database.Cursor;
importandroid.os.Bundle;
importandroid.widget.ListView;
importandroid.widget.SimpleCursorAdapter;
publicclassAndroidSQLiteextendsActivity {
/** Called when the activity is first created. */
@Override
publicvoidonCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//获取分页数据
ContactsService contactsService =newContactsService(this);
Cursor cursor = contactsService.getScrollDataCursor(0, 3);
//获取ListView
ListView lv = (ListView)this.findViewById(R.id.listView);
//创建Adapter
SimpleCursorAdapter adapter =newSimpleCursorAdapter(this,
R.layout.contactitem, cursor,newString[] {"_id","name",
"phone"},newint[] { 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(newOnItemClickListener() {
@Override
publicvoidonItemClick(AdapterView<?> parent, View view,
intposition,longid) {
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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