set GridView Height Based On Children - Android User Interface

Android examples for User Interface:GridView

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Description

set GridView Height Based On Children

Demo Code


//package com.java2s;
import java.lang.reflect.Field;

import android.view.View;
import android.view.ViewGroup;

import android.widget.GridView;
import android.widget.ListAdapter;

public class Main {

    public static void setGridViewHeightBasedOnChildren(GridView gridView) {
        // ????GridView???Adapter
        ListAdapter listAdapter = gridView.getAdapter();
        if (listAdapter == null) {
            return;
        }/*from   w w  w  .  ja  va2 s. co m*/
        int rows;
        int columns = 0;
        int horizontalBorderHeight = 0;
        Class<?> clazz = gridView.getClass();
        try {
            Field column = clazz.getDeclaredField("mRequestedNumColumns");
            column.setAccessible(true);
            columns = (Integer) column.get(gridView);
            Field horizontalSpacing = clazz
                    .getDeclaredField("mRequestedHorizontalSpacing");
            horizontalSpacing.setAccessible(true);
            horizontalBorderHeight = (Integer) horizontalSpacing
                    .get(gridView);
        } catch (Exception e) {
            e.printStackTrace();
        }
        if (listAdapter.getCount() % columns > 0) {
            rows = listAdapter.getCount() / columns + 1;
        } else {
            rows = listAdapter.getCount() / columns;
        }
        int totalHeight = 0;
        for (int i = 0; i < rows; i++) { 
            View listItem = listAdapter.getView(i, null, gridView);
            listItem.measure(0, 0); 
            totalHeight += listItem.getMeasuredHeight(); 
        }
        ViewGroup.LayoutParams params = gridView.getLayoutParams();
        params.height = totalHeight + horizontalBorderHeight * (rows - 1);
        gridView.setLayoutParams(params);
    }
}

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