"reqPermissions": [
    {
    "name": "ohos.permission.DISTRIBUTED_DATASYNC"
    }
]
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public class FirstAbility extends Ability implements IAbilityContinuation {
    ...
}
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@Override
public void onStart(Intent intent) {
    super.onStart(intent);
    super.setMainRoute(FirstAbilitySlice.class.getName());
    requestPermission();
}

private void requestPermission() {
    if (verifySelfPermission(SystemPermission.DISTRIBUTED_DATASYNC) != IBundleManager.PERMISSION_GRANTED) {
        requestPermissionsFromUser(new String[] {SystemPermission.DISTRIBUTED_DATASYNC}, 0);
    }
}
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@Override
public boolean onStartContinuation() {
    return true;
}

@Override
public boolean onSaveData(IntentParams intentParams) {
    return true;
}

@Override
public boolean onRestoreData(IntentParams intentParams) {
    return true;
}

@Override
public void onCompleteContinuation(int i) {
    terminateAbility();
}
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public class FirstAbilitySlice extends AbilitySlice implements LifecycleStateObserver, IAbilityContinuation {
    ...
}
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private void initComponents() {
    findComponentById(ResourceTable.Id_enter_second).setClickedListener(component -> startSecondAbility());
    findComponentById(ResourceTable.Id_continue_ability).setClickedListener(component -> startContinue());
    numberText = (Text) findComponentById(ResourceTable.Id_number);
    lifecycleState = (Text) findComponentById(ResourceTable.Id_lifecycle_state);
}
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private void startContinue() {
    try {
        continueAbility();
    } catch (IllegalStateException | UnsupportedOperationException e) {
        LogUtil.error(TAG, "startContinue Exception ");
    }
}
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@Override
public boolean onStartContinuation() {
    return true;
}

@Override
public boolean onSaveData(IntentParams intentParams) {

    //设置设备迁移后需要恢复的数据
    intentParams.setParam(CONTINUE_PARAM_KEY_INPUT, inputNum);
    return true;
}

@Override
public boolean onRestoreData(IntentParams intentParams) {
    //恢复数据
    Object object = intentParams.getParam(CONTINUE_PARAM_KEY_INPUT);
    if (object instanceof Long) {
        inputNum = (long) object;
    }
    return true;
}

@Override
public void onCompleteContinuation(int i) {
    //设备迁移完成，关闭Slice
    terminate();
}
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public class FirstAbilitySlice extends AbilitySlice implements LifecycleStateObserver{
    ...
}

@Override
public void onStateChanged(Lifecycle.Event event, Intent intent) {
    lifecycleState.setText(lifecycleState.getText() + System.lineSeparator() + event.name());
}
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private void startSecondAbility() {
    Intent intent = new Intent();
    intent.setElement(new ElementName("", getBundleName(), SecondAbility.class.getName()));
    intent.setParam(Const.MESSAGE_KEY_SQUARED, inputNum);
    startAbilityForResult(intent, REQUEST_CODE_TO_ABILITY_B);
}
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/**
 *
 * @param requestCode  发出的请求码，用来识别是自己的请求
 * @param resultCode   收到的结果码，用来校验对端的结果
 * @param resultData   返回的数据
 */
@Override
protected void onAbilityResult(int requestCode, int resultCode, Intent resultData) {

    //使用switch逻辑语句判断
    switch (requestCode) {

        //是自己发出去的请求码
        case REQUEST_CODE_TO_ABILITY_B:
            //是双方约定的结果码
            if (resultCode == Const.RESULT_CODE_FROM_ABILITY_B) {
                //根据key获取指定类型的参数
                long outputNum = resultData.getLongParam(Const.MESSAGE_KEY_SQUARED, 0);
                
                numberText.setText(String.valueOf(outputNum));
            }
            break;
        default:
            break;
    }
}
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