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;
	
	@Override
	protected void setupContentView() {
		setContentView(R.layout.main);
	}

	@Override
	protected void findViewById() {
		tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
		pager = (ViewPager) findViewById(R.id.pager);
		
	}

	@Override
	protected void setListener() {
		// TODO Auto-generated method stub
		
	}

	@Override
	protected 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);
		
	}
	
	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putInt("position", current_position);
	}

	@Override
	protected 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);
		}

		@Override
		public CharSequence getPageTitle(int position) {
			return TITLES[position];
		}

		@Override
		public int getCount() {
			return TITLES.length;
		}

		@Override
		public 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;
		}
	}
}

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;
	}
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}
	
	@Override
	public 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;
	}
}

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;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}
	
	@Override
	public 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;
	}
	
	@Override
	public 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);
	}

	@Override
	public 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