No tab content FrameLayout found for id xxx

问题:最近在做仿微信聊天界面,使用FragmentTabHost的时候出现 No tab content FrameLayout found for id 2131492944的错

下面是xml和main_activity

package com.example.scott.myweixin;import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.widget.TabHost.TabSpec;public class MainActivity extends FragmentActivity
{private FragmentTabHost tabHost;private final static String TAG_CHAT="chat";@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);tabHost.setup(this, getSupportFragmentManager(), R.id.activity_home_container);TabSpec spec=tabHost.newTabSpec(TAG_CHAT);spec.setIndicator("消息");tabHost.addTab(spec,MyFragment.class,null);}
}

<LinearLayout 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:orientation="vertical" ><FrameLayoutandroid:id="@+id/activity_home_container"android:layout_width="fill_parent"android:layout_height="0dp"android:layout_weight="1" ></FrameLayout><android.support.v4.app.FragmentTabHostandroid:id="@android:id/tabhost"android:layout_width="match_parent"android:layout_height="wrap_content" ><TabWidgetandroid:id="@android:id/tabs"android:layout_width="match_parent"android:layout_height="wrap_content"android:layout_alignParentBottom="true"android:background="#FFF1F1F1" ></TabWidget><FrameLayoutandroid:id="@android:id/tabcontent"android:layout_width="0dp"android:layout_height="0dp" ></FrameLayout></android.support.v4.app.FragmentTabHost></LinearLayout>

也查了一些资料,发现保证错是当mRealTabContent为空时,但是上面的内容并不是空的

 private void ensureContent() {if (mRealTabContent == null) {mRealTabContent = (FrameLayout)findViewById(mContainerId);if (mRealTabContent == null) {throw new IllegalStateException("No tab content FrameLayout found for id " + mContainerId);}}