Android Fragment和ViewPage 实现简易可滑动Tab

参考了Android Reference http://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;@Overrideprotected 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);}});}@Overridepublic 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);}@Overridepublic Fragment getItem(int position) {return ArrayListFragment.newInstance(position);}@Overridepublic 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;}@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);Log.i(TAG, "Fragment" + mNum + ":onCreate");mNum = getArguments() != null ? getArguments().getInt("num") : 1;}@Overridepublic 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;}@Overridepublic 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));}@Overridepublic 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>

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