错误代码+ GCC 5.4优化导致无限循环(Erroneous Code + GCC 5.4 Optimisation Causes Infinite Loop)

 为什么不在Toolbar TabLayout放置TabLayout的第一个选项？ 这就是我这样做的结果： 
 
  
 
 布局方面： 
 
<android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize" />

    </android.support.v7.widget.Toolbar>
 
 活动方面： 
 
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayShowHomeEnabled(false);

TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);

tabLayout.getTabAt(0).setIcon(R.drawable.icon1);
....
....
tabLayout.getTabAt(5).setIcon(R.drawable.icon6);
 
 您也可以不使用CoordinatorLayout和AppBarLayout ，因为它们不会发挥作用。 layout_scrollFlags ＆ layout_behavior也会出现。 
 
 编辑： 
 
 我使用UI Automator Viewer来检查LinkedIn在布局方面做了什么。 他们没有使用ActionBar / Toolbar 。 相反，他们有一个水平的LinearLayout ， TabLayout作为第一个孩子，一些独立的图标作为第二个和第三个孩子。 
 
 接下来，我检查了TabLayout's源代码，以确定选项卡使用的确切布局。 TabLayout's选项卡由TabLayout.TabView定义，它是以编程方式创建的LinearLayout ： 
 
class TabView extends LinearLayout implements OnLongClickListener {
    ....
}
 
 我把它翻译成XML： 
 
<LinearLayout
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:paddingStart="12dp"
    android:paddingEnd="12dp"
    android:orientation="vertical"
    android:gravity="center">

    <ImageView
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:src="@drawable/icon5"/>

</LinearLayout>
 
 注意：上面指定的尺寸不是任意的。 它们在设计支持库中定义。 
 
 因此，最终的ActionBar布局将是： 
 
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:orientation="horizontal"
    android:background="?attr/colorPrimary">

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="0dp"
        android:layout_height="?attr/actionBarSize"
        android:layout_weight="4"/>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:paddingStart="12dp"
        android:paddingEnd="12dp"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_weight="1">

        <ImageView
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:src="@drawable/icon5"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:paddingStart="12dp"
        android:paddingEnd="12dp"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_weight="1">

        <ImageView
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:src="@drawable/icon6"/>

    </LinearLayout>

</LinearLayout>

Why not use the first option with the TabLayout placed inside the Toolbar? This is what I get by doing so:
 
 
Layout side:
 
<android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize" />

    </android.support.v7.widget.Toolbar>
 
Activity side:
 
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayShowHomeEnabled(false);

TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);

tabLayout.getTabAt(0).setIcon(R.drawable.icon1);
....
....
tabLayout.getTabAt(5).setIcon(R.drawable.icon6);
 
You can also do without CoordinatorLayout, along with AppBarLayout, since they do not come into play. layout_scrollFlags & layout_behavior will go as well.
 
Edit:
 
I used UI Automator Viewer to check what LinkedIn was doing with their layout. They are not using an ActionBar/Toolbar. Instead, they have a horizontal LinearLayout with TabLayout as the first child, and a couple of independent icons as the second and third. 
 
Next, I checked TabLayout's source to determine the exact layout that tabs use. TabLayout's tabs are defined by TabLayout.TabView which is a LinearLayout created programmatically:
 
class TabView extends LinearLayout implements OnLongClickListener {
    ....
}
 
I translated this to XML:
 
<LinearLayout
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:paddingStart="12dp"
    android:paddingEnd="12dp"
    android:orientation="vertical"
    android:gravity="center">

    <ImageView
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:src="@drawable/icon5"/>

</LinearLayout>
 
Note: The dimensions assigned above are not arbitrary. They are defined in the design support library. 
 
So, the final ActionBar layout will be:
 
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:orientation="horizontal"
    android:background="?attr/colorPrimary">

    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="0dp"
        android:layout_height="?attr/actionBarSize"
        android:layout_weight="4"/>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:paddingStart="12dp"
        android:paddingEnd="12dp"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_weight="1">

        <ImageView
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:src="@drawable/icon5"/>

    </LinearLayout>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:paddingStart="12dp"
        android:paddingEnd="12dp"
        android:orientation="vertical"
        android:gravity="center"
        android:layout_weight="1">

        <ImageView
            android:layout_width="24dp"
            android:layout_height="24dp"
            android:src="@drawable/icon6"/>

    </LinearLayout>

</LinearLayout>