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Harmony程序设计-访问后台服务获取电量信息

发布日期：2024-03-04    作者：陆其美     来源：     点击：

访问后台服务获取电量信息

一、 实验目的

1、建立后台service获取电量信息

2、建立后台与前台信息交互的接口类

3、前台page与后台service交互

二、实验设备与器件

PC机、DevEco Studio工具

三、实验内容

1. 建立后台service获取电量信息

在当前项目的entry\src\main\java目录中的包、com.XX.batteryjavacallpa上单击鼠标右键，新建一个Service Ability，将其命名为BatteryInfo。该servicez主要是提供电量获取功能，系统在config.json文件中会默认注册其为service,注册BatteryInfo Service的代码如下

MainAbilitySlice

package com.example.myapplication_dianchi.slice;

import com.example.myapplication_dianchi.MyRemote;
import com.example.myapplication_dianchi.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.ability.IAbilityConnection;
import ohos.aafwk.content.Intent;
import ohos.aafwk.content.Operation;
import ohos.agp.components.Button;
import ohos.agp.components.Text;
import ohos.bundle.ElementName;
import ohos.hiviewdfx.HiLog;
import ohos.hiviewdfx.HiLogLabel;
import ohos.rpc.IRemoteObject;

public class MainAbilitySlice extends AbilitySlice {
    private String result;
    private static final String TAG = MainAbilitySlice.class.getSimpleName();
    //@Override
    private static final HiLogLabel LABEL_LOG = new HiLogLabel(3, 0xD000F00, TAG);
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_main);
        Button button=(Button) findComponentById(ResourceTable.Id_button_battery);
        button.setClickedListener(component ->startBatteryService());
    }
private IAbilityConnection connection=new IAbilityConnection() {
    @Override
    public void onAbilityConnectDone(ElementName elementName, IRemoteObject iRemoteObject, int resultCode) {
        HiLog.info(LABEL_LOG, "%{public}s", "onAbilityConnectDone resultCode : " + resultCode);
        MyRemote clientRemote = (MyRemote) iRemoteObject;
        Text txt = (Text)findComponentById(ResourceTable.Id_text_helloworld);
        Text txt1= (Text)findComponentById(ResourceTable.Id_text_charing);
        result=clientRemote.getbattery();
        String[] str=result.split(System.lineSeparator());
        txt.setText(str[0]);
        txt1.setText(str[1]);
        Button btn = (Button)findComponentById(ResourceTable.Id_button_battery);
        Button btn1 = (Button)findComponentById(ResourceTable.Id_button_charing);
        btn.setText("电池容量");
        btn1.setText("电池状态");
    }

    @Override
    public void onAbilityDisconnectDone(ElementName elementName, int i) {

    }
};
private void startBatteryService()
{
    Operation operation = new Intent.OperationBuilder().withDeviceId("")
            .withBundleName("com.example.myapplication_dianchi")
            .withAbilityName("com.example.myapplication_dianchi.BatteryInfo")
            .build();
    Intent intent = new Intent();
    intent.setOperation(operation);
    connectAbility(intent, connection);
}

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

484C

MainAbility2Slice

package com.example.myapplication_dianchi.slice;

import com.example.myapplication_dianchi.ResourceTable;
import ohos.aafwk.ability.AbilitySlice;
import ohos.aafwk.content.Intent;

public class MainAbility2Slice extends AbilitySlice {
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        super.setUIContent(ResourceTable.Layout_ability_mainability2);
    }

    @Override
    public void onActive() {
        super.onActive();
    }

    @Override
    public void onForeground(Intent intent) {
        super.onForeground(intent);
    }
}

送到虚拟机后显示的结果

484C

ability_main.xml

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">

    <DirectionalLayout
        xmlns:ohos="http://schemas.huawei.com/res/ohos"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:alignment="center"
        ohos:orientation="horizontal">
        <Text
            ohos:id="$+id:text_helloworld"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text="$string:mainability_HelloWorld"
            ohos:text_size="25vp"
            />

        <Button
            ohos:id="$+id:button_battery"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:left_margin="40px"
            ohos:text="获取电量信息"
            ohos:text_size="25vp"
            />
    </DirectionalLayout>

    <DirectionalLayout
        xmlns:ohos="http://schemas.huawei.com/res/ohos"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:top_margin="50px"
        ohos:alignment="center"
        ohos:orientation="horizontal">
        <Text
            ohos:id="$+id:text_charing"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:text="$string:mainability_HelloWorld"
            ohos:text_size="25vp"
            />

        <Button
            ohos:id="$+id:button_charing"
            ohos:height="match_content"
            ohos:width="match_content"
            ohos:background_element="$graphic:background_ability_main"
            ohos:layout_alignment="horizontal_center"
            ohos:left_margin="40px"
            ohos:text="获取充电信息"
            ohos:text_size="25vp"
            />

    </DirectionalLayout>


</DirectionalLayout>

送到用户虚拟机后显示的结果


ability_mainability2.xml

<?xml version="1.0" encoding="utf-8"?>
<DirectionalLayout
    xmlns:ohos="http://schemas.huawei.com/res/ohos"
    ohos:height="match_parent"
    ohos:width="match_parent"
    ohos:alignment="center"
    ohos:orientation="vertical">

    <Text
        ohos:id="$+id:text_helloworld"
        ohos:height="match_content"
        ohos:width="match_content"
        ohos:background_element="$graphic:background_ability_mainability2"
        ohos:layout_alignment="horizontal_center"
        ohos:text="$string:mainability2_HelloWorld"
        ohos:text_size="40vp"
        />

</DirectionalLayout>

送到虚拟机后显示的结果

undefined

2.返回电池电量及状态字符串

BatteryInfo

private String getBatteryInfo() {
    StringBuilder stringBuilder = new StringBuilder();
    boolean isCharging = getChargingStatus();
    double batteryValue = getBatteryLevel();
    stringBuilder.append(batteryValue)
            .append(" % Battery Left" + System.lineSeparator())
            .append("isCharging: ")
            .append(isCharging);
    return stringBuilder.toString();
}

界面设计的结果

undefined

3.建立后台与前台信息交互的接口类

MyRemote

public class MyRemote extends LocalRemoteObject {
    private String battery = "";
    public MyRemote() {
        super();
    }
    public String getbattery() {
        return battery;
    }
    public void setbattery(String newbattery) {
        battery = newbattery;
    }
}

界面设计的结果

undefined

4、前台page与service交互代码如下

MainAbilitySlice

private void startBatteryService()
{
    Operation operation = new Intent.OperationBuilder().withDeviceId("")
            .withBundleName("com.example.myapplication_dianchi")
            .withAbilityName("com.example.myapplication_dianchi.BatteryInfo")
            .build();
    Intent intent = new Intent();
    intent.setOperation(operation);
    connectAbility(intent, connection);
}

界面设计的结果

undefined

5.客户端IAbilityConnection对象的实现

文件select.php

private IAbilityConnection connection=new IAbilityConnection() {
    @Override
    public void onAbilityConnectDone(ElementName elementName, IRemoteObject iRemoteObject, int resultCode) {
        HiLog.info(LABEL_LOG, "%{public}s", "onAbilityConnectDone resultCode : " + resultCode);
        MyRemote clientRemote = (MyRemote) iRemoteObject;
        Text txt = (Text)findComponentById(ResourceTable.Id_text_helloworld);
        Text txt1= (Text)findComponentById(ResourceTable.Id_text_charing);
        result=clientRemote.getbattery();
        String[] str=result.split(System.lineSeparator());
        txt.setText(str[0]);
        txt1.setText(str[1]);
        Button btn = (Button)findComponentById(ResourceTable.Id_button_battery);
        Button btn1 = (Button)findComponentById(ResourceTable.Id_button_charing);
        btn.setText("电池容量");
        btn1.setText("电池状态");
    }

    @Override
    public void onAbilityDisconnectDone(ElementName elementName, int i) {

    }
};

界面设计的结果

undefined

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