Android Fragment和ViewPage 实现简易可滑动Tab

  参考了Android Referencehttp://developer.android.com/reference/android/support/v4/app/FragmentPagerAdapter.html.
  首先新建一个ViewPageActivity类继承FragmentActivity(android.support.v4.app.FragmentActivity而不是android.app.FragmentActivity)

import android.content.Context;
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.app.ListFragment;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

import com.ryan.test.R;

public class ViewPageActivity extends FragmentActivity {

	private static String[] mStrings = { "tab1", "tab2", "tab3", "tab4" };

	static final int NUM_ITEMS = 4;

	private static final String TAG = ViewPageActivity.class.getName();

	private SectionsPagerAdapter pagerAdapter;
	private ViewPager viewPager;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.viewpage_act);
		pagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
		viewPager = (ViewPager) findViewById(R.id.view_pager);
		viewPager.setAdapter(pagerAdapter);

		Button button1 = (Button) findViewById(R.id.goto_one);
		button1.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
				viewPager.setCurrentItem(0);
			}
		});

		Button button2 = (Button) findViewById(R.id.goto_two);
		button2.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
				viewPager.setCurrentItem(1);
			}
		});

		Button button3 = (Button) findViewById(R.id.goto_three);
		button3.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
				viewPager.setCurrentItem(2);
			}
		});

		Button button4 = (Button) findViewById(R.id.goto_four);
		button4.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
				viewPager.setCurrentItem(3);
			}
		});
	}

	@Override
	public View onCreateView(String name, Context context, AttributeSet attrs) {
		return super.onCreateView(name, context, attrs);
	}

	public static class SectionsPagerAdapter extends FragmentPagerAdapter {

		public SectionsPagerAdapter(FragmentManager fm) {
			super(fm);
		}

		@Override
		public Fragment getItem(int position) {
			return ArrayListFragment.newInstance(position);
		}

		@Override
		public int getCount() {
			return NUM_ITEMS;
		}

	}

	public static class ArrayListFragment extends ListFragment {

		int mNum;

		static ArrayListFragment newInstance(int num) {
			ArrayListFragment f = new ArrayListFragment();
			Bundle args = new Bundle();
			args.putInt("num", num);
			f.setArguments(args);

			return f;
		}

		@Override
		public void onCreate(Bundle savedInstanceState) {
			super.onCreate(savedInstanceState);
			Log.i(TAG, "Fragment" + mNum + ":onCreate");
			mNum = getArguments() != null ? getArguments().getInt("num") : 1;
		}

		@Override
		public View onCreateView(LayoutInflater inflater, ViewGroup container,
				Bundle savedInstanceState) {
			Log.i(TAG, "Fragment"+mNum+":onCreateView");
			View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
			View tv = v.findViewById(R.id.fpl_text);
			((TextView) tv).setText("Fragment #" + mNum);
			return v;
		}

		@Override
		public void onActivityCreated(Bundle savedInstanceState) {
			super.onActivityCreated(savedInstanceState);
			Log.i(TAG, "Fragment"+mNum+":onActivityCreated");
			setListAdapter(new ArrayAdapter<String>(getActivity(),
					android.R.layout.simple_list_item_1, mStrings));
		}
		
		@Override
		public void onListItemClick(ListView l, View v, int position, long id) {
			Log.i(TAG, "Item clicked:" + id);
		}
	}

}

  对应的Layout文件viewpage_actxml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    android:padding="4dip" >

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="0px"
        android:layout_weight="1" >
    </android.support.v4.view.ViewPager>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:gravity="center"
        android:measureWithLargestChild="true"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/goto_one"
            android:layout_width="0px"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="First" />
        
        <Button
            android:id="@+id/goto_two"
            android:layout_width="0px"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="Second" />
        <Button
            android:id="@+id/goto_three"
            android:layout_width="0px"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="Third" />
        
        <Button
            android:id="@+id/goto_four"
            android:layout_width="0px"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:text="Forth" />
    </LinearLayout>

</LinearLayout>

  每个单独的ListFragment对应的Layout文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:drawable/gallery_thumb"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/fpl_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical|center_horizontal"
        android:text="@string/hello_world"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="0dip"
        android:layout_weight="1" >

        <ListView
            android:id="@android:id/list"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:drawSelectorOnTop="false" />

        <!-- Here is the view to show if the list is emtpy -->

        <TextView
            android:id="@android:id/empty"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="No items."
            android:textAppearance="?android:attr/textAppearanceMedium" />
    </FrameLayout>

</LinearLayout>