ViewPager Bild Slider in ScrollView

Question

Ich habe ein Problem mit ViewPager innerhalb ScrollView. Ich habe einen Adapter erstellt, der richtig funktioniert, wenn LinearLayout ein Root-Layout ist. Aber wenn ich zu ScrollView wechsle, dann zeigt es keine Bilder an. Ich brauche ScrollView, weil ich ein paar Elemente zum Anzeigen habe und es muss scrollbar sein. Mein Layout ist in activity_exercises_preview.xml Datei.

-Layout, das nicht funktioniert:

<ScrollView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:padding="5dp" 
    android:background="@color/colorBackground"> 

    <LinearLayout 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:orientation="vertical"> 

     <android.support.v7.widget.CardView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      app:cardCornerRadius="0dp" 
      android:id="@+id/cv" 
      > 

      <LinearLayout 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:orientation="vertical" 
       android:minHeight="200dp"> 

       <android.support.v4.view.ViewPager 
        android:id="@+id/viewPager" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"> 

       </android.support.v4.view.ViewPager> 

      </LinearLayout> 

     <android.support.v7.widget.CardView...> 

     <android.support.v7.widget.CardView...> 

     <android.support.v7.widget.CardView...> 

    </LinearLayout> 

</ScrollView> 

-Layout, das, aber ohne Scroll funktioniert:

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:padding="5dp" 
    android:background="@color/colorBackground"> 

    <LinearLayout 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:orientation="vertical"> 

     <android.support.v7.widget.CardView 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      app:cardCornerRadius="0dp" 
      android:id="@+id/cv" 
      > 

      <LinearLayout 
       android:layout_width="match_parent" 
       android:layout_height="match_parent" 
       android:orientation="vertical" 
       android:minHeight="200dp"> 

       <android.support.v4.view.ViewPager 
        android:id="@+id/viewPager" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent"> 

       </android.support.v4.view.ViewPager> 

      </LinearLayout> 

     <android.support.v7.widget.CardView...> 

     <android.support.v7.widget.CardView...> 

     <android.support.v7.widget.CardView...> 

    </LinearLayout> 

</LinearLayout> 

Mein Adapter:

public class CustomAdapter extends PagerAdapter{ 

    Context context; 
    int[] imageId = {R.drawable.icon, R.drawable.gwiazdki, R.drawable.arnoldki_3}; 

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

    @Override 
    public Object instantiateItem(ViewGroup container, int position) { 
     // TODO Auto-generated method stub 

     LayoutInflater inflater = ((Activity)context).getLayoutInflater(); 

     View viewItem = inflater.inflate(R.layout.image_item, container, false); 
     ImageView imageView = (ImageView) viewItem.findViewById(R.id.imageView); 
     imageView.setImageResource(imageId[position]); 
     ((ViewPager)container).addView(viewItem); 

     return viewItem; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return imageId.length; 
    } 

    @Override 
    public boolean isViewFromObject(View view, Object object) { 
     // TODO Auto-generated method stub 

     return view == ((View)object); 
    } 


    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) { 
     // TODO Auto-generated method stub 
     ((ViewPager) container).removeView((View) object); 
    } 
} 

    Activity: 



public class ExercisesPreview extends AppCompatActivity { 
     List<Exercise> exercises; 
     Exercise exercise; 
     ViewPager viewPager; 

     @Override 
     protected void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.activity_exercises_preview); 

      viewPager = (ViewPager) findViewById(R.id.viewPager); 
      PagerAdapter adapter = new CustomAdapter(ExercisesPreview.this); 
      viewPager.setAdapter(adapter); 
      viewPager.setOnTouchListener(new View.OnTouchListener() { 
       @Override 
       public boolean onTouch(View v, MotionEvent event) { 
        viewPager.getParent().requestDisallowInterceptTouchEvent(true); 
        return false; 
       } 
      }); 

     } 
    (...) 
    } 

image_item.xml:

<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:orientation="vertical" > 

    <ImageView 
     android:id="@+id/imageView" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     /> 

</LinearLayout> 

Irgendwelche Ideen?

Answer 1

Verwendung dieser Brauch ViewPager in Ihrem Scroll:

public class WrapContentHeightViewPager extends ViewPager { 
public WrapContentHeightViewPager(Context context) { 
    super(context); 
} 

public WrapContentHeightViewPager(Context context, AttributeSet attrs) { 
    super(context, attrs); 
} 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
    super.onMeasure(widthMeasureSpec, heightMeasureSpec); 

    int height = 0; 
    for (int i = 0; i < getChildCount(); i++) { 
     View child = getChildAt(i); 
     child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); 
     int h = child.getMeasuredHeight(); 
     if (h > height) height = h; 
    } 
    heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 
    super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
}}