我在从我指定的 XML 布局中以编程方式扩展我的 CustomView 时遇到问题。
我有一个CustomView，它扩展RelativeLayout 并包含另一个RelativeLayout，它又包含2 个ImageView 和1 个LinearLayout。ImageViews 是箭头图标，我分别通过 android:layout_alignParentLeft="true" 和 android:layout_alignParentRight="true" 放置在父级的左侧和右侧，LinearLayout 用于填充其间的所有空间。
为了清楚起见，这里是 Eclipse 布局设计器中的 xml 布局视图，这就是我想要的......
如果我 setContentView(R.layout.my_xml_layout); 直接从 Activity 中，一切都显示在 Eclipse 布局设计器中，但是，如果我从 CustomView 的构造函数中膨胀 R.layout.my_xml_layout，ImageView 的左右两侧有一个无法消失的顽固边距。
这是在 java 代码中完成的，并且是有问题的：
任何帮助将不胜感激！提前致谢！
my_xml_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true">
<ImageView
android:id="@+id/imageLeftArrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:src="@drawable/dock_leftarrow" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</LinearLayout>
<ImageView
android:id="@+id/imageRightArrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:src="@drawable/dock_rightarrow" />
</RelativeLayout>
</RelativeLayout>
我通过这一行在 CustomView 的构造函数中对其进行膨胀：
View.inflate( mContext, R.layout.my_xml_layout, this );
我的 CustomView 的 onLayout：
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// Do nothing. Do not call the superclass method--that would start a layout pass
// on this view's children. PieChart lays out its children in onSizeChanged().
Log.e("DrawView", "DrawView.onLayout: " + l + ", " + t + ", " + r + ", " + b);
int iChildCount = this.getChildCount();
for ( int i = 0; i < iChildCount; i++ ) {
View pChild = this.getChildAt(i);
pChild.layout(0, 0, pChild.getMeasuredWidth(), pChild.getMeasuredHeight());
}
}
我的 CustomView 的 onMeasure：
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// Try for a width based on our minimum
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
Log.d("DockView", "DockView.onMeasure: width: " + widthMeasureSpec + " getWidth: " + MeasureSpec.getSize(widthMeasureSpec));
Log.d("DockView", "DockView.onMeasure: height: " + heightMeasureSpec + " getHeight: " + MeasureSpec.getSize(heightMeasureSpec));
Log.d("DockView", "DockView.onMeasure: getPaddingLeft: " + getPaddingLeft() + " getPaddingRight: " + getPaddingRight());
Log.d("DockView", "DockView.onMeasure: getPaddingTop: " + getPaddingTop() + " getPaddingBottom: " + getPaddingBottom());
// http://stackoverflow.com/a/17545273/474330
int iParentWidth = MeasureSpec.getSize(widthMeasureSpec);
int iParentHeight = MeasureSpec.getSize(heightMeasureSpec);
this.setMeasuredDimension(iParentWidth, iParentHeight);
int iChildCount = this.getChildCount();
for ( int i = 0; i < iChildCount; i++ ) {
View pChild = this.getChildAt(i);
this.measureChild( pChild,
MeasureSpec.makeMeasureSpec(iParentWidth, MeasureSpec.EXACTLY),
MeasureSpec.makeMeasureSpec(iParentHeight, MeasureSpec.EXACTLY)
);
}
}