如何使用flowlayout(或任何自定义布局)

我是android的新手,正在寻找像控件一样的wrappanel(wpf)。 我找到了一个名为FlowLayout的类(这个类的代码在我的问题的底部)。 我在这个文件夹中添加了这个类:MyApp-src-Layouts-FlowLayout.java

在我的mylayout.xml中,我想在另一个布局中使用此布局:

    

但是我收到一个错误:找不到以下类: – com.myapp.FlowLayout(修复构建路径,编辑XML,创建类)

这是FlowLayoutClass:

 package Layouts; import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.ViewGroup; public class FlowLayout extends ViewGroup { private int line_height; public static class LayoutParams extends ViewGroup.LayoutParams { public final int horizontal_spacing; public final int vertical_spacing; /** * @param horizontal_spacing Pixels between items, horizontally * @param vertical_spacing Pixels between items, vertically */ public LayoutParams(int horizontal_spacing, int vertical_spacing) { super(0, 0); this.horizontal_spacing = horizontal_spacing; this.vertical_spacing = vertical_spacing; } } public FlowLayout(Context context) { super(context); } public FlowLayout(Context context, AttributeSet attrs) { super(context, attrs); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { assert (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED); final int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight(); int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom(); final int count = getChildCount(); int line_height = 0; int xpos = getPaddingLeft(); int ypos = getPaddingTop(); int childHeightMeasureSpec; if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) { childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST); } else { childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); } for (int i = 0; i  width) { xpos = getPaddingLeft(); ypos += line_height; } xpos += childw + lp.horizontal_spacing; } } this.line_height = line_height; if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) { height = ypos + line_height; } else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) { if (ypos + line_height < height) { height = ypos + line_height; } } setMeasuredDimension(width, height); } @Override protected ViewGroup.LayoutParams generateDefaultLayoutParams() { return new LayoutParams(1, 1); // default of 1px spacing } @Override protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { if (p instanceof LayoutParams) { return true; } return false; } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { final int count = getChildCount(); final int width = r - l; int xpos = getPaddingLeft(); int ypos = getPaddingTop(); for (int i = 0; i  width) { xpos = getPaddingLeft(); ypos += line_height; } child.layout(xpos, ypos, xpos + childw, ypos + childh); xpos += childw + lp.horizontal_spacing; } } } } 

我在这里做错了什么?

提前致谢,

比约恩

资源(res)中的layout-folder需要一个xml文件。 Java类属于src-folder。 编译器暂时无法处理它。

FlowLayourClass的第一行是: package Layouts; 所以在你的xml中你应该这样做:

   

您应该在此处输入您的类名称,后面是完整的包名称。