安卓：如何强制GridView的宽度为wrap_content？ [英] Android: how to force GridView width to wrap_content?

问题描述

我的GridView控件包含固定宽度的列，固定水平间距。如果没有足够的列horziontally填满整个屏幕，我想我的GridView的宽度来包装其内容，并在屏幕中心垂直。

My GridView contains columns of fixed width, with fixed horizontal spacing. If there are not enough columns to fill the screen horziontally, I would like my GridView's width to wrap to its contents, and to center vertical in the screen.

不过，无论我使用的列数，GridView的宽度增长到填满整个屏幕。所附图片显示了这一点，其中绿色的GridView水平充满屏幕，尽管有只有3列，其宽度被设置为WRAP_CONTENT。

However, regardless of the number of columns I use, the GridView's width grows to fill the screen. The attached image shows this, where the green GridView fills the screen horizontally, despite having only 3 columns and its width being set to "wrap_content".

public class Temp extends Activity
{
    private GridView grid;
    private int columnWidth = 80;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);

        View view = getLayoutInflater().inflate(R.layout.gridview, null);
        grid = (GridView) view.findViewById(R.id.grid);
        grid.setColumnWidth(columnWidth);
        grid.setAdapter(new GridAdapter());

        setContentView(view);
    }

    class GridAdapter extends BaseAdapter 
    {
        public GridAdapter() 
        {
        }

        public int getCount() 
        {
            return 3;
        }

        public Object getItem(int position) 
        {
            return null;
        }

        public long getItemId(int position) 
        {
            return position;
        }

        public View getView (int position, View convertView, ViewGroup parent) 
        {
            View ret;

            if (convertView == null) 
            {
                ret = new ImageView(Temp.this);
                ret.setLayoutParams(new GridView.LayoutParams(columnWidth, 100));
                ret.setBackgroundColor(Color.WHITE);
            }
            else
            {   
                ret= convertView;
            }

            return ret;
        }
    }
}




<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="#FF0000"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <GridView 
        android:id="@+id/grid"
        android:background="#00FF00"
        android:layout_centerInParent="true"
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content"
        android:numColumns="auto_fit"
        android:verticalSpacing="2dip"
        android:horizontalSpacing="2dip"
        android:stretchMode="columnWidth"
        android:gravity="center">
    </GridView>
</RelativeLayout>

推荐答案

只需在左侧和GridView的右体重= 1添加两个空的观点，并分配0.5重量GridView控件。例如：

Simply add two empty views at left and right of GridView with weight = 1 and assign 0.5 weight to GridView. Eg.

<LinearLayout 
    android:layout_width="fill_parent"
    android:gravity="center"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <View
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <GridView
        android:id="@+id/myGridView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numColumns="2"
        android:scrollbars="none"
        android:verticalSpacing="10dp" >
    </GridView>

    <View
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1" />
</LinearLayout>

这篇关于安卓：如何强制GridView的宽度为wrap_content？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！