自定义布局控件

Question

我试图做一个类似于LinearLayout的自定义布局控件，但我希望所有的控件内部包装。这就像LinearLayout，但包装。所以，我从Android的固定网格控件的例子，并开始修改它。它正在工作，但我遇到了问题。

问题是，当我把按钮放在里面时，文字并没有让我给他们引力或我给的任何参数。在下面的图片中，按钮内部的文本应居中，并在垂直中间，但事实并非如此。

我FixedGridLayout类的来源是：

package com.projects; 

import android.content.Context; 
import android.view.View; 
import android.view.ViewGroup; 

public class FixedGridLayout extends ViewGroup { 

    int mCellWidth = 160; 
    int mCellHeight = 120; 

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

    @Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 
     int cellWidthSpec = MeasureSpec.makeMeasureSpec(mCellWidth, MeasureSpec.AT_MOST); 
     int cellHeightSpec = MeasureSpec.makeMeasureSpec(mCellHeight, MeasureSpec.AT_MOST); 

     int count = getChildCount(); 
     for (int index = 0; index < count; index++) { 
      final View child = getChildAt(index); 
      child.measure(cellWidthSpec, cellHeightSpec); 
     } 
     int minCount = count > 3 ? count : 3; 
     setMeasuredDimension(resolveSize(mCellWidth * minCount, widthMeasureSpec), 
       resolveSize(mCellHeight * minCount, heightMeasureSpec)); 
    } 

    @Override 
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 
     int cellWidth = mCellWidth; 
     int cellHeight = mCellHeight; 
     int columns = (right - left)/cellWidth; 
     if (columns < 0) { 
      columns = 1; 
     } 
     int x = 0; 
     int y = 0; 
     int i = 0; 
     int count = getChildCount(); 
     for (int index = 0; index < count; index++) { 
      final View child = getChildAt(index); 
      child.layout(x, y , x + cellWidth, y + cellHeight); 
      if (i >= (columns - 1)) { 
       i = 0; 
       x = 0; 
       y += cellHeight; 
      } else { 
       i++; 
       x += cellWidth; 
      } 
     } 
    } 
} 

我用它来测试布局XML代码：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
    <com.projects.FixedGridLayout android:layout_width="600dp" android:layout_height="300dp"> 
     <Button android:text="Line1 Line2" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1 Line2 Line3" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1 Line2" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1 Line2 Line3" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1" android:gravity="center_horizontal|center_vertical" /> 
     <Button android:text="Line1" android:gravity="center_horizontal|center_vertical" /> 
    </com.projects.FixedGridLayout> 
</LinearLayout> 

类FixedGridLayout的代码是一个精简，针对我的应用和此问题稍作修改和简化：http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/animation/FixedGridLayout.html

Answer 1

如果你想做这样的事情，你应该考虑使用网格视图。 http://developer.android.com/resources/tutorials/views/hello-gridview.html

而且，你可以做安卓重力=“中心”，你会得到两个CENTER_HORIZONTAL和center_vertical