Android Fragment 嵌套使用(Nested Fragments)

        最近项目中一个需求需要嵌套使用Fragment，于是乎研究了一凡了，Fragment嵌套使用用到了getChildFragmentManager()方法，这个是support v4 jar中的提供方法。自己抽时间写了一个简单的Demo跟大家分享，示例中使用到了GitHub上一个非常流行的库 PagerSlidingTabStrip，它提供了在ViewPager 不同page之间导航的指示器功能。官方地址：https://github.com/astuetz/PagerSlidingTabStrip。

先看看Demo 的效果：

点击Next进入第二个Child Fragment：

这里只贴一下主要的代码，完整代码大家可以下载下来后自己去研究。

MainActivity 源代码：

package com.ricky.nestfragment;import android.graphics.Color;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.view.ViewPager;import android.util.TypedValue;import com.astuetz.PagerSlidingTabStrip;import com.ricky.nestfragment.fragment.CommonFragment;import com.ricky.nestfragment.fragment.ContainerFragment;/** *  * @author Ricky Feng * */public class MainActivity extends BaseFragmentActivity {private PagerSlidingTabStrip tabs;private ViewPager pager;private MyPagerAdapter adapter;private int current_position = 0;@Overrideprotected void setupContentView() {setContentView(R.layout.main);}@Overrideprotected void findViewById() {tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);pager = (ViewPager) findViewById(R.id.pager);}@Overrideprotected void setListener() {// TODO Auto-generated method stub}@Overrideprotected void processLogic() {adapter = new MyPagerAdapter(getSupportFragmentManager());pager.setAdapter(adapter);final int pageMargin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 4, getResources().getDisplayMetrics());pager.setPageMargin(pageMargin);//tabs.setBackgroundColor(Color.parseColor("#FFF4842D"));tabs.setIndicatorColor(Color.parseColor("#FFF4842D"));tabs.setViewPager(pager);}@Overrideprotected void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);outState.putInt("position", current_position);}@Overrideprotected void onRestoreInstanceState(Bundle savedInstanceState) {super.onRestoreInstanceState(savedInstanceState);current_position = savedInstanceState.getInt("position");}public class MyPagerAdapter extends FragmentPagerAdapter {private final String[] TITLES = { "Categories", "Home", "Top Paid", "Top Free", "Top Grossing", "Top New Paid","Top New Free", "Trending" };public MyPagerAdapter(FragmentManager fm) {super(fm);}@Overridepublic CharSequence getPageTitle(int position) {return TITLES[position];}@Overridepublic int getCount() {return TITLES.length;}@Overridepublic Fragment getItem(int position) {current_position = position;Fragment fragment = null;switch (position) {case 0:fragment = new ContainerFragment();break;default:fragment = new CommonFragment(TITLES[position]);break;}return fragment;}}}

CommonFragment源代码如下：

package com.ricky.nestfragment.fragment;import com.ricky.nestfragment.R;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;public class CommonFragment extends Fragment {private String title;public CommonFragment(String title){this.title = title;}@Overridepublic void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);}@Overridepublic View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragment_common, null);TextView tv_title = (TextView) view.findViewById(R.id.tv_title);tv_title.setText(title);return view;}}

最重要的是ContainerFragment 源代码如下：

package com.ricky.nestfragment.fragment;import com.ricky.nestfragment.R;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v4.app.Fragment;import android.util.Log;import android.view.LayoutInflater;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;/** * Fragment容器，用来嵌套其他子Fragment * @author Ricky Feng * */public class ContainerFragment extends Fragment implements OnClickListener {private static final String TAG = ContainerFragment.class.getSimpleName();private int mCurrentlyShowingFragment = 0;private Button bt_show;@Overridepublic void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);}@Overridepublic View onCreateView(LayoutInflater inflater,@Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragment_container, null);bt_show = (Button) view.findViewById(R.id.bt_show);bt_show.setOnClickListener(this);return view;}@Overridepublic void onViewCreated(View view, @Nullable Bundle savedInstanceState) {if (savedInstanceState == null) {            getChildFragmentManager().beginTransaction().replace(R.id.fl_chilid, new ChildFragmentOne("Child Fragment One")).commit();            mCurrentlyShowingFragment = 0;        } else {            mCurrentlyShowingFragment = savedInstanceState.getInt("currently_showing_fragment");        }        adjustButtonText();super.onViewCreated(view, savedInstanceState);}@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.bt_show:if (mCurrentlyShowingFragment == 0) {            showNextScreen();        } else {            showPreviousScreen();        }break;default:break;}}private void showNextScreen() {        mCurrentlyShowingFragment = 1;        getChildFragmentManager().beginTransaction().replace(R.id.fl_chilid, new ChildFragmentTwo("Child Fragment Two")).addToBackStack(null).commit();        adjustButtonText();    }    private void showPreviousScreen() {        mCurrentlyShowingFragment = 0;        getChildFragmentManager().popBackStackImmediate();        adjustButtonText();    }        private void adjustButtonText() {        if(mCurrentlyShowingFragment == 0){        bt_show.setText("Next");        } else {        bt_show.setText("Previous");        }    }        @Override    public void onSaveInstanceState(Bundle outState) {    outState.putInt("currently_showing_fragment", mCurrentlyShowingFragment);    super.onSaveInstanceState(outState);    }        @Override    public void onPause() {    Log.e(TAG, "onPause");        super.onPause();    }}

今天就先写到这里了，有问题的同学可以留言讨论！

完整Demo下载地址：http://download.csdn.net/detail/fx_sky/7600087