android帮助！ pagetabstrip，title adapter，inflater和viewpager所有未知类

Question

我正在尝试在android上构建一个标签式布局，我已编码但它告诉我标题适配器，查看寻呼机变量和活动主要在oncreateoptionsmenu中膨胀是未知的类，我完全卡住了，任何帮助不胜感激。

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.PagerTabStrip;
import android.support.v4.view.ViewPager;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
public class MainActivity extends FragmentActivity{

    private ViewPager mViewPager;

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

        mViewPager = (ViewPager) findViewById(R.id.viewpager);
        PagerTabStrip pagerTabStrip = (pagerTabStrip) findViewById(R.id.pagerTabStrip);

        TitleAdapter titleAdapter = new    TitleAdapter(getSupportFragmentManager());
        mViewPager.setAdapter(TitleAdapter);
        mViewPager.setCurrentItem(0);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.Activity_main, menu);
        return true;
    }
}