HarmonyOS实战一原子化服务初尝试(ClockFACardDemo学习)

卡片数据服务：为了方便处理·时钟卡片刷新的定时任务，我们创建了一个Service Ability，定时去更新卡片信息，在TimerAbility.java中

package com.huawei.cookbooks;
import com.huawei.cookbooks.database.Form;
import com.huawei.cookbooks.database.FormDatabase;
import com.huawei.cookbooks.utils.ComponentProviderUtils;
import com.huawei.cookbooks.utils.DatabaseUtils;
import ohos.aafwk.ability.Ability;
import ohos.aafwk.ability.FormException;
import ohos.aafwk.content.Intent;
import ohos.agp.components.ComponentProvider;
import ohos.data.DatabaseHelper;
import ohos.data.orm.OrmContext;
import ohos.data.orm.OrmPredicates;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;
import ohos.rpc.IRemoteObject;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;
/**
* Time PA  时钟更新Service Ability。
*/
public class TimerAbility extends Ability {
private static final HiLogLabel LABEL_LOG = new HiLogLabel(3, 0xD001100, "Demo");
private static final long SEND_PERIOD = 1000L;
private DatabaseHelper helper = new DatabaseHelper(this);
private OrmContext connect;
@Override
public void onStart(Intent intent) {
HiLog.info(LABEL_LOG, "TimerAbility::onStart");
connect = helper.getOrmContext("FormDatabase", "FormDatabase.db", FormDatabase.class);
startTimer();
super.onStart(intent);
}
// 卡片更新定时器，每秒更新一次
private void startTimer() {
Timer timer = new Timer();
timer.schedule(
new TimerTask() {
@Override
public void run() {
updateForms();
}
},
0,
SEND_PERIOD);
}
private void updateForms() {
// 从数据库中获取卡片信息
OrmPredicates ormPredicates = new OrmPredicates(Form.class);
List<Form> formList = connect.query(ormPredicates);
// 更新时分秒
if (formList.size() <= 0) {
return;
}
for (Form form : formList) {
// 遍历卡片列表更新卡片
ComponentProvider componentProvider = ComponentProviderUtils.getComponentProvider(form, this);
try {
Long updateFormId = form.getFormId();
updateForm(updateFormId, componentProvider);
} catch (FormException e) {
// 删除不存在的卡片
DatabaseUtils.deleteFormData(form.getFormId(), connect);
HiLog.error(LABEL_LOG, "onUpdateForm updateForm error");
}
}
}
@Override
public void onBackground() {
super.onBackground();
HiLog.info(LABEL_LOG, "TimerAbility::onBackground");
}
@Override
public void onStop() {
super.onStop();
HiLog.info(LABEL_LOG, "TimerAbility::onStop");
}
}

有关卡片组件的更新，封装了ComponentProviderUtils这个类，在卡片更新时候，通过调用updateForm方法，传入参数formId和componentProvider.

package com.huawei.cookbooks.utils;
import com.huawei.cookbooks.ResourceTable;
import com.huawei.cookbooks.database.Form;
import ohos.agp.components.ComponentProvider;
import ohos.agp.utils.Color;
import ohos.app.Context;
import java.util.Calendar;
/**
* Component ProviderUtils 提供获取ComponentProvider对象的方法，用于卡片组件的更新。
*/
public class ComponentProviderUtils {
// 当前星期颜色
private static Color nowWeekColor = new Color(Color.rgb(255, 245, 238));
// 原色星期
private static Color primaryWeekColor = new Color(Color.rgb(192, 192, 192));
private static final int WEEK_DAYS = 7;
private static final int STRING_LENGTH = 2;
private static final int DIM_VERSION = 3;
private static final int SUNDAY = 1;
private static final int MONDAY = 2;
private static final int TUESDAY = 3;
private static final int WEDNESDAY = 4;
private static final int THURSDAY = 5;
private static final int FRIDAY = 6;
private static final int SATURDAY = 7;
/**
* Obtain the day of the week
*
* @return week
*/
public static int getWeekDayId() {
Calendar calendar = Calendar.getInstance();
int week = calendar.get(Calendar.DAY_OF_WEEK);
int result = getWeekIdResult(week);
return result;
}
/**
* get week component id
*
* @param week week
* @return component id
*/
private static int getWeekIdResult(int week) {
int result = ResourceTable.Id_mon;
switch (week) {
case SUNDAY:
result = ResourceTable.Id_sun;
break;
case MONDAY:
result = ResourceTable.Id_mon;
break;
case TUESDAY:
result = ResourceTable.Id_tue;
break;
case WEDNESDAY:
result = ResourceTable.Id_wed;
break;
case THURSDAY:
result = ResourceTable.Id_thu;
break;
case FRIDAY:
result = ResourceTable.Id_fri;
break;
case SATURDAY:
result = ResourceTable.Id_sat;
break;
default:
result = ResourceTable.Id_sun;
break;
}
return result;
}
/**
* Obtains the ComponentProvider object
*
* @param form form info
* @param context context
* @return component provider
*/
public static ComponentProvider getComponentProvider(Form form, Context context) {
int layoutId = ResourceTable.Layout_form_image_with_info_date_card_2_2;
if (form.getDimension() == DIM_VERSION) {
layoutId = ResourceTable.Layout_form_image_with_info_date_card_2_4;
}
ComponentProvider componentProvider = new ComponentProvider(layoutId, context);
setComponentProviderValue(componentProvider);
return componentProvider;
}
/**
* Time converted to string
*
* @param time time
* @return time string
*/
private static String int2String(int time) {
String timeString;
if (String.valueOf(time).length() < STRING_LENGTH) {
timeString = "0" + time;
} else {
timeString = time + "";
}
return timeString;
}
/**
* Set the value of componentProvider
*
* @param componentProvider component provider
*/
private static void setComponentProviderValue(ComponentProvider componentProvider) {
Calendar now = Calendar.getInstance();
int hour = now.get(Calendar.HOUR_OF_DAY);
int min = now.get(Calendar.MINUTE);
int second = now.get(Calendar.SECOND);
String hourString = int2String(hour);
String minString = int2String(min);
String secondString = int2String(second);
componentProvider.setText(ResourceTable.Id_date, DateUtils.getCurrentDate("yyyy-MM-dd"));
componentProvider.setText(ResourceTable.Id_hour, hourString);
componentProvider.setText(ResourceTable.Id_min, minString);
componentProvider.setText(ResourceTable.Id_sec, secondString);
// 获取当前星期
int weekDayId = getWeekDayId();
componentProvider.setTextColor(weekDayId, nowWeekColor);
// 将前一天的星期改回原色
int lastWeekId = getLastWeekDayId();
componentProvider.setTextColor(lastWeekId, primaryWeekColor);
}
/**
* obtain previous day of the week
*
* @return previous day of the week
*/
public static int getLastWeekDayId() {
Calendar calendar = Calendar.getInstance();
int week = calendar.get(Calendar.DAY_OF_WEEK);
int lastWeek;
if (week == 1) {
lastWeek = WEEK_DAYS;
} else {
lastWeek = week - 1;
}
return getWeekIdResult(lastWeek);
}
}

对于服务卡片我们就先学的这里，学完了Demo，小伙伴是不是蠢蠢欲动呢？自己写一个类似的Demo应该是在可能完成的范围之内的，感兴趣的小伙伴赶快试试吧。之后我准备基于官方的一个Demo(一个音频播放器)，搞一个服务卡片。嗯，时间关系，今天就先搞到这里。

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