Android使用ViewStub实现布局优化方法示例

<?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">
 
    <Button
       android:id="@+id/idBtnInflate"
       android:layout_width="match_parent"
       android:layout_height="wrap_content"
       android:text="inflate" />
    <ViewStub
        android:id="@+id/viewStubName"
        android:inflatedId="@+id/inflatedLayoutName"
        android:layout="@layout/yourLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
</LinearLayout>

idBtnInflate.setOnClickListener{
    viewStubName. inflate()
    //或者是下面的形式加载，因为里面会执行inflate
    // viewStubName.visibility=View.VISIBLE
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    setMeasuredDimension(0, 0);
}
@Override
public void draw(Canvas canvas) {
}
@Override
protected void dispatchDraw(Canvas canvas) {
}
public void setWillNotDraw(boolean willNotDraw) {
    setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK);
}