Android FragmentTabHost必须调用带有Context和FragmentManager的setup（）

Question

可能这是一个愚蠢的错误，但我无法弄清楚我做错了什么。

我的基本xml包含FragmentTabHost和coordinatorLayout（即使删除coordinator错误仍然存​​在）。

这是xml ：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="...">

    <android.support.v4.app.FragmentTabHost
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >

            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom"/>

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="fill_parent"
                android:layout_height="0dp"
                android:layout_weight="1" />
        </LinearLayout>

    </android.support.v4.app.FragmentTabHost>

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/fab"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="16dp"
            android:clickable="true"
            app:layout_anchor="@id/activity_main"
            app:layout_anchorGravity="bottom|right|end" />

</android.support.design.widget.CoordinatorLayout>

然后我在 java代码中设置FragmentTabHost，如下所示：

public class MainActivity extends AppCompatActivity {

    private FragmentTabHost mTabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);
        mTabHost.setup(this, getSupportFragmentManager(), android.R.id.tabcontent); //tried both those
        //mTabHost.setup(this, getSupportFragmentManager()); //tried both those

        mTabHost.addTab(mTabHost.newTabSpec("cerca").setIndicator("Cerca"),
                SearchFragment.class, null);
        mTabHost.addTab(mTabHost.newTabSpec("favoriti").setIndicator("Favoriti"),
                FavoriteFragment.class, null);

    }
}

我认为这是一个非常简单的代码，但是当compiling或查看我的xml时，我不明白为什么会出现此错误：

 java.lang.IllegalStateException: Must call setup() that takes a Context and FragmentManager
    at android.support.v4.app.FragmentTabHost.setup(FragmentTabHost.java:188)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.setupTabHost(RenderSessionImpl.java:1191)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.postInflateProcess(RenderSessionImpl.java:972)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.postInflateProcess(RenderSessionImpl.java:1048)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.postInflateProcess(RenderSessionImpl.java:1048)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:336)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
    at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548)
    at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533)
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966)
    at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533)
    at com.android.tools.idea.rendering.RenderTask.lambda$inflate$53(RenderTask.java:659)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

我清理，我重新编译，我将我的设置方法更改为有或没有第3个参数。我不知道该做什么，有什么想法吗？