Question

我做了PagerAdapter，效果非常好但是当我将手机水平放置时，TextView等许多内容都不可见，因为它们是＆＃34;低于＆＃34;手机的屏幕。我知道我可以放ScrollView，但是这个选项会产生很多错误。

除ScrollView之外还有其他选项或错误意味着什么？

这是我的代码LinearLayout没有任何错误，但PagerAdapter不可滚动。

Java代码：

public class SlideAdapter_info extends PagerAdapter {
    Context context;
    LayoutInflater inflater;

    public SlideAdapter_info(Context context){
        this.context = context;
    }

    @Override
    public int getCount() {
        return 1;
    }

    @Override
        public boolean isViewFromObject(View view, Object object) {
        return (view==(LinearLayout)object);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object{
        container.removeView((LinearLayout)object);
    }

    @NonNull
    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        inflater = (LayoutInflater) 
        context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.slide_info, container, false);
        //other code to set the textviews and the imageview
        container.addView(view);
        return view;
    }
}

xml代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/slidelinear_info"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:gravity="center"
     android:orientation="vertical">

<TextView /> ....

<!-- This allows me to have a circle shaped image-->
<de.hdodenhof.circleimageview.CircleImageView 
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/slideimg"
    android:layout_width="200dp"
    android:layout_height="200dp"
    android:paddingTop="10dp"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    app:civ_border_color="@color/black"
    app:civ_border_width="3dp" />

    <TextView /> ....

    </LinearLayout>

这是结果:(水平）

这是结果:(垂直）

如果不是LinearLayout我放ScrollView，Android Studio会给我这个错误：

java.lang.IllegalStateException: ScrollView can host only one direct child

at esame.progetto.xhondar.github.com.info.SlideAdapter_info.instantiateItem(SlideAdapter_info.java:87)

这是一行： View view = inflater.inflate(R.layout.slide_info, container, false);

Answer 1

MyClass myClass QObject *home = object->findChild<QObject*>("homeButton"); // I'm able to connect to every Object in the main.qml or home.qml QObject::connect(home,SIGNAL(qmlSignal(Qstring)), &myClass, SLOT(cppSlot(QString))); connect( myClass, MyClass::emitWhenQMLIsAlreadyOnTheStack, this, [this](){ QObject *test = newobject->findChild<QObject*>("test"); // Now you should be able to connect QObject::connect(test,SIGNAL(qmlSignal(Qstring)), &myClass, SLOT(cppSlot(QString)); });告诉您确切的问题所在。只需将java.lang.IllegalStateException: ScrollView can host only one direct child转换为LinearLayout，就可以有多个孩子。如果您希望当前布局在ScrollView内滚动，则需要将ViewPager与LinearLayout包装在布局xml文件中。

ScrollView

可滚动的PagerAdapter

1 个答案: