Android_ViewPager基础+Fragment_141008

概况 :  开启一个MainActivity.java 文件, 开始加载两个Fragment, 在第二个Fragment 中 , 点击按钮, 一旦点击, 则生成一个新的Fragment.

文件:

MainActivity.java --> 继承于 FragmentActivity , 对应的布局为 activity_main.xml 文件 , 创建一个ViewPager

FragmentOne.java --> 继承于Fragment , 对应的布局为 first_fragment.xml 

FragmentTwo.java --> 继承于Fragment , 对应的布局为 second_fragment.xml , 并且设置点击实践, 创建新的fragment

代码:

  // MainActivity.java

package com.yline.viewpager;

import java.util.ArrayList;
import java.util.List;

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.view.ViewPager;

public class MainActivity extends FragmentActivity{
	private List<Fragment> mFragmentList;
	private ViewPagerAdapter mVPAdapter;
	private ViewPager mViewPager;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		mFragmentList = new ArrayList<Fragment>();
		
		mViewPager = (ViewPager) findViewById(R.id.viewpager);
		mVPAdapter = new ViewPagerAdapter(getSupportFragmentManager());
		mViewPager.setAdapter(mVPAdapter);
		
		addContent(new FragmentOne());
		addContent(new FragmentTwo());
	}
	
	private class ViewPagerAdapter extends FragmentPagerAdapter{

		/**
		 * 管理 FragmentList
		 * @param fm
		 */
		public ViewPagerAdapter(FragmentManager fm) {
			super(fm);
			mFragmentList.remove(mFragmentList);
			//可以选择在这里, 直接新建,加载Fragment
			//Fragment Fragment = new FragmentOne();
			//mFragmentList.add(Fragment);
		}

		/**
		 * 得到当前界面
		 */
		@Override
		public Fragment getItem(int location) {
			return mFragmentList.get(location);
		}

		/**
		 * //获取当前窗体界面数
		 */
		@Override
		public int getCount(){
			return mFragmentList.size();
		}
	}
	
	public void addContent(Fragment fragment){
		int size = mFragmentList.size();
		mFragmentList.add(size,fragment);  //size为加载在哪一页后面
		mVPAdapter.notifyDataSetChanged();
		/**
		 * 更新到当前, 最新的一页
		 */
		//mViewPager.setCurrentItem(size);
	}
}

  // activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"/>

</RelativeLayout>

  // FragmentOne.java

package com.yline.viewpager;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentOne extends Fragment {

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.fragment_one, null);
		return v;
	}
}

  // FragmentTwo.java

package com.yline.viewpager;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.Button;

public class FragmentTwo extends Fragment {
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View v = inflater.inflate(R.layout.fragment_two, null);
		return v;
	}
	
	@Override
	public void onViewCreated(View view, Bundle savedInstanceState) {
		super.onViewCreated(view, savedInstanceState);
		Button add = (Button) view.findViewById(R.id.btn_two);
		add.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View arg0) {
				MainActivity newOne = (MainActivity) getActivity();
				newOne.addContent(new FragmentThree());
			}
		});
	}
}

运行:

 1) 运行,开启一个MainActivity.java 文件, 开始加载两个Fragment, 

 2) 在第二个Fragment 中 , 点击按钮, 一旦点击, 则生成一个新的Fragment.

图:

Android_ViewPager基础_141008代码链接 : (可直接运行)

http://pan.baidu.com/s/1eQhA658