allprojects {
    repositories {
        maven {
            url 'https://s01.oss.sonatype.org/content/repositories/releases/'
        }
    }
}

dependencies {
implementation('com.gitee.chinasoft_ohos:Ohos_Multibackstack:1.0.0')
......  
}

<StackLayout
        ohos:id="$+id:show_stack"
        ohos:height="match_content"
        ohos:width="match_parent"
        ohos:weight="10"/>

searchFraction = new SearchFraction(this);
favoritesFraction = new FavoritesFraction(this);
proFileFraction = new ProFileFraction(this);
((FractionAbility) getAbility()).getFractionManager()
.startFractionScheduler()
.add(ResourceTable.Id_show_stack, searchFraction)
.add(ResourceTable.Id_show_stack, favoritesFraction)
.add(ResourceTable.Id_show_stack, proFileFraction)
.hide(favoritesFraction)
.hide(proFileFraction)
.show(searchFraction)
.submit();
addAction(searchFraction, -1);

@Override
protected void onBackPressed() {
if (list.size() == 1) {
stopAbility(intent);
System.exit(0);
return;
}
Action action = (Action) list.get(list.size() - 2);
int item = action.getItem();
initComponent();
if (action.getFraction() instanceof SearchFraction) {
searchFraction.setItem(item);
setSearchAnimator(search, search_img, ResourceTable.Media_search_true, search_text);
selectInt = 0;
} else if (action.getFraction() instanceof ProFileFraction) {
proFileFraction.setItem(item);
setSearchAnimator(profile, profile_img, ResourceTable.Media_mine_true, profile_text);
selectInt = 2;
} else if (action.getFraction() instanceof FavoritesFraction) {
favoritesFraction.setItem(item);
setSearchAnimator(favorites, favorites_img, ResourceTable.Media_heart_true, favorites_text);
selectInt = 1;
}
((FractionAbility) getAbility()).getFractionManager()
.startFractionScheduler()
.hide(searchFraction)
.hide(favoritesFraction)
.hide(proFileFraction)
.show(action.getFraction())
.submit();
if (list.size() != 0) {
list.remove(list.size() - 1);
}
}