FragmentPagerAdapter+ViewPager实现Tab切换效果

1.Activity 加载布局文件,获取Viewpager控件给ViewPager填充适配器.

import android.app.ActionBar;

import android.app.ActionBar.Tab;

import android.app.Activity;

import android.app.Fragment;

import android.app.FragmentTransaction;

import android.content.Context;

import android.os.Bundle;

import android.support.v13.app.FragmentPagerAdapter;

import android.support.v4.view.ViewPager;

import android.view.ActionMode;

import java.util.ArrayList;

public class MainActivity extends Activity {

    private static final String INSTANCESTATE_TAB = "tab";

    ViewPager mViewPager;

    TabsAdapter mTabsAdapter;

    ActionMode mActionMode;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.fragment_pager);

        mViewPager = (ViewPager) findViewById(R.id.pager);

        final ActionBar bar = getActionBar();

        bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        bar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_SHOW_HOME);

        mTabsAdapter = new TabsAdapter(this, mViewPager);

        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_sd),

                Fragment1.class, null);

        mTabsAdapter.addTab(bar.newTab().setText(R.string.tab_remote),

        		Fragment2.class, null);

        if (savedInstanceState != null) {

            bar.setSelectedNavigationItem(savedInstanceState.getInt(INSTANCESTATE_TAB, 0));

        }

    }

    @Override

    protected void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);

        outState.putInt(INSTANCESTATE_TAB, getActionBar().getSelectedNavigationIndex());

    }

    public void setActionMode(ActionMode actionMode) {

        mActionMode = actionMode;

    }

    public ActionMode getActionMode() {

        return mActionMode;

    }

    public static class TabsAdapter extends FragmentPagerAdapter

            implements ActionBar.TabListener, ViewPager.OnPageChangeListener {

        private final Context mContext;

        private final ActionBar mActionBar;

        private final ViewPager mViewPager;

        private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

        static final class TabInfo {

            private final Class<?> clss;

            private final Bundle args;

            private Fragment fragment;

            TabInfo(Class<?> _class, Bundle _args) {

                clss = _class;

                args = _args;

            }

        }

        public TabsAdapter(Activity activity, ViewPager pager) {

            super(activity.getFragmentManager());

            mContext = activity;

            mActionBar = activity.getActionBar();

            mViewPager = pager;

            mViewPager.setAdapter(this);

            mViewPager.setOnPageChangeListener(this);

        }

        public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {

            TabInfo info = new TabInfo(clss, args);

            tab.setTag(info);

            tab.setTabListener(this);

            mTabs.add(info);

            mActionBar.addTab(tab);

            notifyDataSetChanged();

        }

        @Override

        public int getCount() {

            return mTabs.size();

        }

        @Override

        public Fragment getItem(int position) {

            TabInfo info = mTabs.get(position);

            if (info.fragment == null) {

                info.fragment = Fragment.instantiate(mContext, info.clss.getName(), info.args);

            }

            return info.fragment;

        }

        @Override

        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

        }

        @Override

        public void onPageSelected(int position) {

            mActionBar.setSelectedNavigationItem(position);

        }

        @Override

        public void onPageScrollStateChanged(int state) {

        }

        @Override

        public void onTabSelected(Tab tab, FragmentTransaction ft) {

            Object tag = tab.getTag();

            for (int i=0; i<mTabs.size(); i++) {

                if (mTabs.get(i) == tag) {

                    mViewPager.setCurrentItem(i);

                }

            }

            if(!tab.getText().equals(mContext.getString(R.string.tab_sd))) {

                ActionMode actionMode = ((MainActivity) mContext).getActionMode();

                if (actionMode != null) {

                    actionMode.finish();

                }

            }

        }

        @Override

        public void onTabUnselected(Tab tab, FragmentTransaction ft) {

        }

        @Override

        public void onTabReselected(Tab tab, FragmentTransaction ft) {

        }

    }

}

2.fragment_pager.xml布局文件里面就一个ViewPager控件大家记得导入v4包

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

<android.support.v4.view.ViewPager

    xmlns:android="http://schemas.android.com/apk/res/android"

    android:id="@+id/pager"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

</android.support.v4.view.ViewPager>

3.Fragment1.java

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

public class Fragment1 extends Fragment{

	@Override

	public View onCreateView(LayoutInflater inflater, ViewGroup container,

			Bundle savedInstanceState) {

//		return View.inflate(getActivity(), R.layout.fragment1, null);

		return inflater.inflate(R.layout.fragment1,container, false);

	}

}

4.fragment1.xml布局文件

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="这是第一个页面" />

</RelativeLayout>

效果图如下:

巴特西

FragmentPagerAdapter+ViewPager实现Tab切换效果

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