Gridview height gets cut

Question

I\'m trying to display 8 items inside a gridview. Sadly, the gridview height is always too little, so that it only shows the first row, and a little part of the second.

Answer 1

Just calculate the height for AT_MOST and set to on measure. Here GridView Scroll will not work so. Need to use Vertical Scroll View explicitly.

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

     if (getLayoutParams().height == LayoutParams.WRAP_CONTENT) {

         heightSpec = MeasureSpec.makeMeasureSpec(
                        Integer.MAX_VALUE >> 2, MeasureSpec.AT_MOST);
     }
     else {
         // Any other height should be respected as is.
         heightSpec = heightMeasureSpec;
     }

     super.onMeasure(widthMeasureSpec, heightSpec);
 }

Answer 2

Jacob R solution in Kotlin:

class ExpandableHeightGridView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : GridView(context, attrs, defStyleAttr) {

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        val expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK,
            MeasureSpec.AT_MOST)
        super.onMeasure(widthMeasureSpec, expandSpec)
        layoutParams.height = measuredHeight
    }
}

After adding GridView to RecyclerView I got a full-size GridView (all rows are visible), as expected.

Answer 3

After (too much) research, I stumbled on the excellent answer of Neil Traft.

Adapting his work for the GridView has been dead easy.

ExpandableHeightGridView.java:

package com.example;
public class ExpandableHeightGridView extends GridView
{

    boolean expanded = false;

    public ExpandableHeightGridView(Context context)
    {
        super(context);
    }

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

    public ExpandableHeightGridView(Context context, AttributeSet attrs,
            int defStyle)
    {
        super(context, attrs, defStyle);
    }

    public boolean isExpanded()
    {
        return expanded;
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // HACK! TAKE THAT ANDROID!
        if (isExpanded())
        {
            // Calculate entire height by providing a very large height hint.
            // View.MEASURED_SIZE_MASK represents the largest height possible.
            int expandSpec = MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK,
                    MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, expandSpec);

            ViewGroup.LayoutParams params = getLayoutParams();
            params.height = getMeasuredHeight();
        }
        else
        {
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public void setExpanded(boolean expanded)
    {
        this.expanded = expanded;
    }
}

Include it in your layout like this:

<com.example.ExpandableHeightGridView
    android:id="@+id/myId"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:horizontalSpacing="2dp"
    android:isScrollContainer="false"
    android:numColumns="4"
    android:stretchMode="columnWidth"
    android:verticalSpacing="20dp" />

Lastly you just need to ask it to expand:

mAppsGrid = (ExpandableHeightGridView) findViewById(R.id.myId);
mAppsGrid.setExpanded(true);

Answer 4

Another similar approach that worked for me, is to calculate the height for one row and then with static data (you may adapt it to paginate) you can calculate how many rows you have and resize the GridView height easily.

    private void resizeGridView(GridView gridView, int items, int columns) {
    ViewGroup.LayoutParams params = gridView.getLayoutParams();
    int oneRowHeight = gridView.getHeight();
    int rows = (int) (items / columns);
    params.height = oneRowHeight * rows;
    gridView.setLayoutParams(params);
}

Use this code after setting the adapter and when the GridView is drawn or you will get height = 0.

gridView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                if (!gridViewResized) {
                    gridViewResized = true;
                    resizeGridView(gridView, numItems, numColumns);
                }
            }
        });

Answer 5

After using the answer from @tacone and making sure it worked, I decided to try shorting down the code. This is my result. PS: It is the equivalent of having the boolean "expanded" in tacones answer always set to true.

public class StaticGridView extends GridView {

    public StaticGridView(Context context) {
        super(context);
    }

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

    public StaticGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(MEASURED_SIZE_MASK, MeasureSpec.AT_MOST));
        getLayoutParams().height = getMeasuredHeight();
    }
}

Answer 6

Found tacones answer helpfull... so i ported it to C# (Xamarin)

public class ExpandableHeightGridView: GridView
{
    bool _isExpanded = false;

    public ExpandableHeightGridView(Context context) : base(context)
    {            
    }

    public ExpandableHeightGridView(Context context, IAttributeSet attrs) : base(context, attrs)
    {            
    }

    public ExpandableHeightGridView(Context context, IAttributeSet attrs, int defStyle) : base(context, attrs, defStyle)
    {            
    }

    public bool IsExpanded
    {
        get { return _isExpanded; }

        set { _isExpanded = value;  }
    }

    protected override void OnMeasure(int widthMeasureSpec, int heightMeasureSpec)
    {
        // HACK! TAKE THAT ANDROID!
        if (IsExpanded)
        {
            // Calculate entire height by providing a very large height hint.
            // View.MEASURED_SIZE_MASK represents the largest height possible.
            int expandSpec = MeasureSpec.MakeMeasureSpec( View.MeasuredSizeMask, MeasureSpecMode.AtMost);
            base.OnMeasure(widthMeasureSpec,expandSpec);                

            var layoutParameters = this.LayoutParameters;
            layoutParameters.Height = this.MeasuredHeight;
        }
        else
        {
            base.OnMeasure(widthMeasureSpec,heightMeasureSpec);    
        }
    }
}