HarmonyOS学习路之开发篇—设备管理（设备标识符）

public class MainAbility extends Ability {
    // 建议开发者自行设计界面,示例代码仅供参考
    private static final int OFFSET_X = 100;
    private static final int OFFSET_Y = 100;
    private static final int ADD_OFFSET_Y = 150;
    private static final int BUTTON_WIDTH = 800;
    private static final int BUTTON_HEIGHT = 100;
    private static final int TEXT_SIZE = 50;
    private int offsetY = 0;
    // 应用包名
    private String BUNDLE_NAME = "com.example.continuationdemo";
    // 注册控制中心服务后返回的Ability token
    private int abilityToken;
    // 用户在设备列表中选择设备后返回的NetworkID
    private String selectNetworkId;
    // 获取控制中心服务管理类
    private IContinuationRegisterManager continuationRegisterManager;
    // 设置控制中心设备状态变更的回调
    private IContinuationDeviceCallback callback = new IContinuationDeviceCallback() {
    @Override
    public void onDeviceConnectDone(String networkId,String deviceType) {
    // 在用户选择设备后回调获取NetworkID
    selectNetworkId = networkId;
    }
    @Override
    public void onDeviceDisconnectDone(String networkId) {
    }
    };
    // 设置注册控制中心服务回调
    private RequestCallback requestCallback = new RequestCallback() {
    @Override
    public void onResult(int result) {
    abilityToken = result;
    }
    };
    // 弹出选择设备列表
    private ClickedListener mShowDeviceListListener = new ClickedListener() {
        @Override
        public void onClick(Component arg0) {
            // 显示选择设备列表
            continuationRegisterManager.showDeviceList(abilityToken, null, null);
        }
    };
    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);
        continuationRegisterManager = getContinuationRegisterManager();
        // 开发者可以自行进行界面设计
        // 为按钮设置统一的背景色
        // 例如通过PositionLayout可以实现简单界面
        PositionLayout layout = new PositionLayout(this);
        LayoutConfig config = new LayoutConfig(LayoutConfig.MATCH_PARENT, LayoutConfig.MATCH_PARENT);
        layout.setLayoutConfig(config);
        ShapeElement buttonBg = new ShapeElement();
        buttonBg.setRgbColor(new RgbColor(0, 125, 255));
        Button btnShowDeviceList = createButton("ShowDeviceList", buttonBg);
        btnShowDeviceList.setClickedListener(mShowDeviceListListener);
        linear.addComponent(btnShowDeviceList);
        super.setUIContent(layout);
        // 注册控制中心
        continuationRegisterManager.register(BUNDLE_NAME, null, callback, requestCallback);
    }
    private Button createButton(String text, ShapeElement buttonBg) {
        Button button = new Button(this);
        button.setContentPosition(OFFSET_X, OFFSET_Y + offsetY);
        offsetY += ADD_OFFSET_Y;
        button.setWidth(BUTTON_WIDTH);
        button.setHeight(BUTTON_HEIGHT);
        button.setTextSize(TEXT_SIZE);
        button.setTextColor(Color.YELLOW);
        button.setText(text);
        button.setBackground(buttonBg);
        return button;
    }
    @Override
    public void onStop() {
        super.onStop();
        // 解注册控制中心
        continuationRegisterManager.unregister(abilityToken, null);
    }
}

private String getDVID() {
    return AccountAbility.getAccountAbility().getDistributedVirtualDeviceId();
}
UUID

import java.util.UUID
UUID uuid  =  UUID.randomUUID()