anriod TabHost

package com.example.yanlei.mytk;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.text.method.HideReturnsTransformationMethod;
import android.text.method.PasswordTransformationMethod;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.Toast;

import android.app.TabActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.widget.TabHost;

public class MainActivity extends TabActivity {

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setTitle("标签控件Tab");
        TabHost tabHost = getTabHost();
        LayoutInflater.from(this).inflate(R.layout.activity_main, tabHost.getTabContentView(), true);
        tabHost.addTab(tabHost.newTabSpec("biaoqian1").setIndicator("标签tab1").setContent(R.id.tab1));
        tabHost.addTab(tabHost.newTabSpec("biaoqian2").setIndicator("标签tab2").setContent(R.id.tab2));
        tabHost.addTab(tabHost.newTabSpec("biaoqian3").setIndicator("标签tab3").setContent(R.id.tab3));
    }
}

<?xml version="1.0" encoding="UTF-8"?>

    <FrameLayout android:layout_height="fill_parent" android:layout_width="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">

    <TabHost
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/tabHost"
        android:layout_gravity="left|center_vertical">

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

            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"></TabWidget>

            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <LinearLayout
                    android:id="@+id/tab1"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical">

                    <TextView
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="New Text"
                        android:id="@+id/textView" />
                </LinearLayout>

                <LinearLayout
                    android:id="@+id/tab2"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical"></LinearLayout>

                <LinearLayout
                    android:id="@+id/tab3"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="vertical"></LinearLayout>
            </FrameLayout>
        </LinearLayout>
    </TabHost>
</FrameLayout>