布局中如果没有android:id="@id/swipe_target"，可以根据顺序判断header、target、footer #138
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if (mTargetView==null){
switch (childNum){
case 1:{
mTargetView=getChildAt(0);
break;
}
case 2:{
if (mFooterView!=null){
mTargetView=getChildAt(0);
}else {
mHeaderView=getChildAt(0);
mTargetView=getChildAt(1);
}
break;
}
case 3:{
mHeaderView=getChildAt(0);
mTargetView=getChildAt(1);
mFooterView=getChildAt(2);
break;
}
}