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package
com.phodev.andtools.widget;import
android.content.Context;import
android.graphics.Rect;import
android.util.AttributeSet;import
android.view.View;import
android.view.ViewGroup;/** *
由于ListView，Gridiew,等高度设置为wrap_content的时候会有问题，如果此时下面还有其他view， *
当AdapterView的item很多的上海，不仅scroll有问题,底部跟随的view也会跑到可是范围外 *
*
<pre> *
<com.phodev.widgets.AutoFollowBox> *
<ListView *
android:layout_width="fill_parent" *
android:layout_height="wrap_content"// 必须是wrap content,否则没有必要使用该组建，直接布局即可 *
/> *
<OtherView/>//有切只有有一个OtherView如果底部是多个View，可以放到一个布局里面。总是AutoFollowBox有切职能有两个Child *
<com.phodev.widgets.AutoFollowBox/> *
</pre> *
*
@author sky *
*/public
class
AutoFollowBox extends
ViewGroup { public
AutoFollowBox(Context context, AttributeSet attrs) { super(context,
attrs); } public
AutoFollowBox(Context context) { super(context); } private
Rect marginInfo = new
Rect(); @Override protected
void
onLayout(boolean
changed, int
l, int
t, int
r, int
b) { int
childCount = getChildCount(); int
maxW = r - l; int
cl, ct, cr, cb; int
heightOffset = 0; for
(int
i = 0;
i < childCount; i++) { View
v = getChildAt(i); getMargingInfo(v,
marginInfo); cl
= marginInfo.left; ct
= marginInfo.top + heightOffset; cr
= maxW - marginInfo.right; cb
= ct + v.getMeasuredHeight(); v.layout(cl,
ct, cr, cb); heightOffset
= cb + marginInfo.bottom; } } @Override protected
void
onMeasure(int
widthMeasureSpec, int
heightMeasureSpec) { int
childCount = getChildCount(); if
(childCount != 2)
{ throw
new
RuntimeException( "mast
only 2 views is AutoFoolowAdapterViewBox"); } // View
stretchView = getChildAt(0); View
followView = getChildAt(1); //
start measure int
offsetBottom = 0; int
followViewHeihgt = 0; if
(followView.getVisibility() == View.VISIBLE) { LayoutParams
lp = followView.getLayoutParams(); measureChildWithMargins(followView,
widthMeasureSpec, 0, heightMeasureSpec,
0); followViewHeihgt
= followView.getMeasuredHeight(); if
(lp instanceof
MarginLayoutParams) { MarginLayoutParams
mlp = (MarginLayoutParams) lp; offsetBottom
= mlp.topMargin + mlp.bottomMargin +
followViewHeihgt; } } // if
(stretchView.getVisibility() == View.VISIBLE) { measureChildWithMargins(stretchView,
widthMeasureSpec, 0, heightMeasureSpec,
offsetBottom); } // int
maxWantWitdh = Math.max(getMeasuerWidthWithMarging(followView), getMeasuerWidthWithMarging(stretchView)); int
maxWantHeight = getMeasuerHeightWithMarging(stretchView) +
getMeasuerHeightWithMarging(followView); // int
measuredWidth = resolveSize(maxWantWitdh, widthMeasureSpec); int
measuredHeight = resolveSize(maxWantHeight, heightMeasureSpec); setMeasuredDimension(measuredWidth,
measuredHeight); } private
int
getMeasuerHeightWithMarging(View v) { LayoutParams
lp = v.getLayoutParams(); int
hAdd = 0; if
(lp instanceof
MarginLayoutParams) { MarginLayoutParams
mlp = (MarginLayoutParams) lp; hAdd
= mlp.topMargin + mlp.bottomMargin; } return
v.getMeasuredHeight() + hAdd; } private
int
getMeasuerWidthWithMarging(View v) { LayoutParams
lp = v.getLayoutParams(); int
wAdd = 0; if
(lp instanceof
MarginLayoutParams) { MarginLayoutParams
mlp = (MarginLayoutParams) lp; wAdd
= mlp.leftMargin + mlp.rightMargin; } return
v.getMeasuredWidth() + wAdd; } private
void
getMargingInfo(View v, Rect out) { if
(v != null
&& v.getLayoutParams() instanceof
MarginLayoutParams) { MarginLayoutParams
mlp = (MarginLayoutParams) v.getLayoutParams(); // out.set(mlp.leftMargin,// mlp.topMargin,// mlp.rightMargin,// mlp.bottomMargin); }
else
{ out.set(0,
0,
0,
0); } } @Override protected
LayoutParams generateDefaultLayoutParams() { return
new
MarginLayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); } @Override public
LayoutParams generateLayoutParams(AttributeSet attrs) { return
new
MarginLayoutParams(getContext(), attrs); }} |
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原文地址：http://blog.csdn.net/u014311051/article/details/42644165
