Android 底部的标签页指示器

我正在使用和样本标签开关。我想要底部的标签页指示器。如果在XML布局中使用页面查看器更改TabPageIndicator，我总是会遇到一个异常

 java.lang.ClassCastException: com.viewpagerindicator.TabPageIndicator cannot be cast to android.support.v4.view.ViewPager

如何将TabPageIndicator置于底部

simple_tabs.xml：

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

<android.support.v4.view.ViewPager
    android:id="@+id/pager"
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    />

<com.viewpagerindicator.TabPageIndicator
    android:id="@+id/indicator"
    android:layout_height="wrap_content"
    android:layout_width="fill_parent"
    />

</LinearLayout>

样本来源：

---

尝试清理您的项目。有时候这会修正一些奇怪的错误。你是对的。谢谢

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.ViewPager;
import com.viewpagerindicator.IconPagerAdapter;
import com.viewpagerindicator.TabPageIndicator;

public class SampleTabsWithIcons extends FragmentActivity {
    private static final String[] CONTENT = new String[] { "Calendar", "Camera", "Alarms", "Location" };
    private static final int[] ICONS = new int[] {
            R.drawable.perm_group_calendar,
            R.drawable.perm_group_camera,
            R.drawable.perm_group_device_alarms,
            R.drawable.perm_group_location,
    };

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

        FragmentPagerAdapter adapter = new GoogleMusicAdapter(getSupportFragmentManager());

        ViewPager pager = (ViewPager)findViewById(R.id.pager);
        pager.setAdapter(adapter);

        TabPageIndicator indicator = (TabPageIndicator)findViewById(R.id.indicator);
        indicator.setViewPager(pager);
    }

    class GoogleMusicAdapter extends FragmentPagerAdapter implements IconPagerAdapter {
        public GoogleMusicAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return TestFragment.newInstance(CONTENT[position % CONTENT.length]);
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return CONTENT[position % CONTENT.length].toUpperCase();
        }

        @Override public int getIconResId(int index) {
          return ICONS[index];
        }

      @Override
        public int getCount() {
          return CONTENT.length;
        }
    }
}