Gridview 高度被削减 [英] Gridview height gets cut

问题描述

我正在尝试在 gridview 中显示 8 个项目.遗憾的是，gridview 的高度总是太小，所以它只显示第一行，以及第二行的一小部分.

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.

设置 android:layout_height="300dp" 使其工作.wrap_content 和 fill_parent 显然不是.

Setting android:layout_height="300dp" makes it work. wrap_content and fill_parent apparently not.

我的网格视图:

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

我的物品资源:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:minHeight="?android:attr/listPreferredItemHeight" >

    <ImageView
        android:id="@+id/appItemIcon"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_dialog_info"
        android:scaleType="center" />      

    <TextView
        android:id="@+id/appItemText"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="My long application name"
        android:gravity="center_horizontal"
        android:textAppearance="?android:attr/textAppearanceSmall" />

</LinearLayout>

该问题似乎与缺乏垂直空间无关.

The issue does not seem related to a lack of vertical space.

我能做什么?

推荐答案

经过(太多)研究，我偶然发现了极好的答案尼尔·特拉夫特.

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

为 GridView 调整他的工作非常容易.

Adapting his work for the GridView has been dead easy.

ExpandableHeightGridView.java:

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;
    }
}

像这样将它包含在您的布局中:

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" />

最后你只需要让它扩展:

Lastly you just need to ask it to expand:

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

这篇关于Gridview 高度被削减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！