Android使用ActionBar和ViewPager切換頁面

Android使用ActionBar和ViewPager切換頁面

示範效果如下：

項目布局如下：

MainActivity.java代碼

import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.support.v4.app.Fragment;import android.support.v4.app.FragmentManager;import android.support.v4.app.FragmentPagerAdapter;import android.support.v4.app.FragmentTransaction;import android.support.v4.view.ViewPager;import android.support.v4.view.ViewPager.OnPageChangeListener;import android.support.v7.app.ActionBar;import android.support.v7.app.ActionBar.Tab;import android.support.v7.app.ActionBar.TabListener;import android.support.v7.app.ActionBarActivity;import com.xuliugen.fragment.ChatFragment;import com.xuliugen.fragment.FriendFragment;import com.xuliugen.fragment.MomentFragment;import com.xuliugen.fragment.MoreFragment;public class MainActivity extends ActionBarActivity implements TabListener,OnPageChangeListener {    private List tabsList = new ArrayList(4);    private ViewPager viewPager;// ViewPager用於存放fragment    private ActionBar actionBar;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        // 添加4個fragment到自訂的Tab中去        tabsList.add(new MyTab("聊天", ChatFragment.class));        tabsList.add(new MyTab("朋友", FriendFragment.class));        tabsList.add(new MyTab("時刻", MomentFragment.class));        tabsList.add(new MyTab("更多", MoreFragment.class));        initActionBar();    }    private void initActionBar() {        // 找到viewpager        viewPager = (ViewPager) this.findViewById(R.id.viewpager);        actionBar = getSupportActionBar(); // 獲得v7中的ActionBar        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);// 設定為導航模式        // 通過迴圈遍曆將建立的四個Tab加入到actionBar中        for (MyTab tab : tabsList) {            Tab t = actionBar.newTab(); // 使用v7下邊的Tab            t.setText(tab.getText());            t.setTabListener(this);// 設定TabListener監聽器            actionBar.addTab(t);        }        viewPager.setAdapter(new TabFragmentPagerAdapter(getSupportFragmentManager()));        viewPager.setOnPageChangeListener(this);    }    /**     * 封裝一個Tab的類     *      * tab的文字     *      * tab所包含的Class     */    class MyTab {        private String text; // 標題的文字        private Class fragment;// 每一個tab所對應的頁面fragment        public String getText() {            return text;        }        public void setText(String text) {            this.text = text;        }        public Class getFragment() {            return fragment;        }        public void setFragment(Class fragment) {            this.fragment = fragment;        }        /**         * 兩個參數的構造方法，便於建立一個對象         *          * @param string         * @param fragment         */        public MyTab(String string, Class fragment) {            this.text = string;            this.fragment = fragment;        }    }    /**     * 為viewpager設定的適配器     */    class TabFragmentPagerAdapter extends FragmentPagerAdapter {        public TabFragmentPagerAdapter(FragmentManager fm) {            super(fm);        }        @Override        public Fragment getItem(int i) {            try {                return (Fragment) tabsList.get(i).getFragment().newInstance();            } catch (InstantiationException e) {                e.printStackTrace();            } catch (IllegalAccessException e) {                e.printStackTrace();            }            return null;        }        @Override        public int getCount() {            return tabsList.size();        }    }    /************* 下邊是TabListener所實現的方法 ***********************/    /**     * 當Tab被雙次選中     */    @Override    public void onTabReselected(Tab tab, FragmentTransaction fragmentTransaction) {    }    /**     * 當Tab被單次選中     */    @Override    public void onTabSelected(Tab tab, FragmentTransaction fragmentTransaction) {        viewPager.setCurrentItem(tab.getPosition());    }    @Override    public void onTabUnselected(Tab tab, FragmentTransaction fragmentTransaction) {    }    /**************** 下邊是OnPageChangeListener實現的方法 ****************/    @Override    public void onPageScrollStateChanged(int i) {    }    @Override    public void onPageScrolled(int i, float arg1, int arg2) {    }    @Override    public void onPageSelected(int i) {        actionBar.selectTab(actionBar.getTabAt(i));    }}

下邊是四個fragment

public class ChatFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_friends, container, false);    }}

public class FriendFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_chat, container, false);    }}

public class MomentFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_moment, container, false);    }}

public class MoreFragment extends Fragment {    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container,            Bundle savedInstanceState) {        return inflater.inflate(R.layout.fragment_more, container, false);    }}

activity_main.xml

下邊是四個fragment的布局檔案

其他三個都一樣只是檔案名稱和裡邊的內容改變了一下。