Android中使用ViewStub实现布局优化

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  xmlns:tools="http://schemas.android.com/tools"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:paddingLeft="@dimen/activity_horizontal_margin"
  android:paddingRight="@dimen/activity_horizontal_margin"
  android:paddingTop="@dimen/activity_vertical_margin"
  android:paddingBottom="@dimen/activity_vertical_margin"
  tools:context="com.droidyue.viewstubsample.MainActivity">

 <Button
   android:id="@+id/clickMe"
   android:text="Hello World!"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"/>
 
 <ViewStub
   android:id="@+id/myViewStub"
   android:inflatedId="@+id/myInflatedViewId"
   android:layout="@layout/include_merge"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_below="@id/clickMe"
 />
</RelativeLayout>

ViewStub myViewStub = (ViewStub)findViewById(R.id.myViewStub);
if (myViewStub != null) {
 myViewStub.inflate();
 //或者是下面的形式加载
 //myViewStub.setVisibility(View.VISIBLE);
}

<merge xmlns:android="http://schemas.android.com/apk/res/android">

 <Button
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="Yes"/>

 <Button
   android:layout_width="fill_parent"
   android:layout_height="wrap_content"
   android:text="No"/>

</merge>

<?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">
  <include layout="@layout/merge_layout"/>
</LinearLayout>

/**
  * When visibility is set to {@link #VISIBLE} or {@link #INVISIBLE},
  * {@link #inflate()} is invoked and this StubbedView is replaced in its parent
  * by the inflated layout resource.
  *
  * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}.
  *
  * @see #inflate() 
  */
 @Override
 public void setVisibility(int visibility) {
  if (mInflatedViewRef != null) {
   View view = mInflatedViewRef.get();
   if (view != null) {
    view.setVisibility(visibility);
   } else {
    throw new IllegalStateException("setVisibility called on un-referenced view");
   }
  } else {
   super.setVisibility(visibility);
   if (visibility == VISIBLE || visibility == INVISIBLE) {
    inflate();
   }
  }
 }

/**
  * Inflates the layout resource identified by {@link #getLayoutResource()}
  * and replaces this StubbedView in its parent by the inflated layout resource.
  *
  * @return The inflated layout resource.
  *
  */
 public View inflate() {
  final ViewParent viewParent = getParent();

  if (viewParent != null && viewParent instanceof ViewGroup) {
   if (mLayoutResource != 0) {
    final ViewGroup parent = (ViewGroup) viewParent;
    final LayoutInflater factory = LayoutInflater.from(mContext);
    final View view = factory.inflate(mLayoutResource, parent,
      false);

    if (mInflatedId != NO_ID) {
     view.setId(mInflatedId);
    }

    final int index = parent.indexOfChild(this);
    parent.removeViewInLayout(this);

    final ViewGroup.LayoutParams layoutParams = getLayoutParams();
    if (layoutParams != null) {
     parent.addView(view, index, layoutParams);
    } else {
     parent.addView(view, index);
    }

    mInflatedViewRef = new WeakReference<View>(view);

    if (mInflateListener != null) {
     mInflateListener.onInflate(this, view);
    }

    return view;
   } else {
    throw new IllegalArgumentException("ViewStub must have a valid layoutResource");
   }
  } else {
   throw new IllegalStateException("ViewStub must have a non-null ViewGroup viewParent");
  }
 }