Fragment配合viewpager的简单使用

第一部分是fragment的简单使用：

直接写代码，不废话：

package com.example.myfragment;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;

import com.example.myfragment.FriendListFragment.CallBack;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.AdapterView.OnItemSelectedListener;

public class MainActivity extends Activity implements CallBack{
    public static class Friend{
        public String name,message;
        public Friend(){}
        public Friend(String name,String message){
            this.name=name;
            this.message=message;
        }
        public String getMessage(){
            return message;
        }
        public String getName(){
            return name;
        }
    }
    public static class FriendsData{
        public static String[] str={"English","Chinese","Math","C++","Sql"};
        public static LinkedList<String> list=new LinkedList<String>();
        public static HashMap<String,Friend> friends=new HashMap<String, MainActivity.Friend>();
    }
    static{
        for(String ele:FriendsData.str){
            FriendsData.list.add(ele);
            FriendsData.friends.put(ele, new Friend(ele, ele+"'s message"));
        }
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    @Override
    public void onItemSelected(int index) {
        // TODO Auto-generated method stub
        Bundle b=new Bundle();
        b.putInt("id",index);
        FriendDetailFragment fdf=FriendDetailFragment.newIntance(index);
        getFragmentManager().beginTransaction().replace(R.id.mainlayout_detail,fdf).commit();
    }
    
}

下面这个代码是Fragment的一种使用方式：继承ListFragment，让使用该Fragmentment的Activity实现CallBack接口，在main布局中指定大小：

package com.example.myfragment;

import com.example.myfragment.MainActivity.FriendsData;

import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class FriendListFragment extends ListFragment {
    CallBack callbackactivity;

    public interface CallBack {
        public void onItemSelected(int index);
    }

    @Override
    public void onAttach(Activity activity) {
        // TODO Auto-generated method stub
        super.onAttach(activity);
        if (!(activity instanceof CallBack)) {
            throw new IllegalStateException(
                    "the activity containing friendListFragment must implements Callback interface!");
        }
        callbackactivity = (CallBack) activity;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        ArrayAdapter aa = new ArrayAdapter(getActivity(),
                android.R.layout.simple_list_item_activated_1,
                android.R.id.text1, FriendsData.list);
        this.setListAdapter(aa);
    }

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

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO Auto-generated method stub
        super.onListItemClick(l, v, position, id);
        callbackactivity.onItemSelected(position);
    }
}

下面又是一种调用Fragment的方式：在代码中调用：

package com.example.myfragment;

import com.example.myfragment.MainActivity.Friend;
import com.example.myfragment.MainActivity.FriendsData;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class FriendDetailFragment extends Fragment {
    Friend fr=null;
    public static FriendDetailFragment newIntance(int id){
        FriendDetailFragment ff=new FriendDetailFragment();
        Bundle args=new Bundle();
        args.putInt("id", id);
        ff.setArguments(args);
        return ff;
    }
    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        if(getArguments()!=null&&getArguments().containsKey("id")){
            int id=getArguments().getInt("id");
            fr=FriendsData.friends.get(FriendsData.list.get(id));
        }
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        View view=inflater.inflate(R.layout.mine_layout, null);
        if(fr!=null){
            EditText text1=(EditText)view.findViewById(R.id.name),text2=(EditText)view.findViewById(R.id.message);
            text1.setText(fr.getName());
            text2.setText(fr.getMessage());
        }
        return view;
    }
    public void onDestroyView() {
        super.onDestroyView();
        fr=null;
    }
}

这个事总的布局文件：

<LinearLayout 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"
    android:orientation="horizontal"
    android:divider="?android:attr/dividerHorizontal"
    android:showDividers="middle"
    android:layout_marginLeft="8dp"
     android:layout_marginRight="8dp"
    tools:context=".MainActivity" >
    <fragment 
        android:name="com.example.myfragment.FriendListFragment"
        android:id="@+id/mainlayout_list"
        android:layout_height="match_parent"
        android:layout_width="0dp"
        android:layout_weight="1.5"></fragment>
    <FrameLayout 
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:id="@+id/mainlayout_detail"
        android:layout_weight="3.0"></FrameLayout>
</LinearLayout>

这个事上面说的第二种方式调用的布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView
        android:layout_width="70dp"
        android:layout_height="wrap_content"
        android:text="Name :" />
    <EditText 
        android:id="@+id/name"
        android:hint="name is ******"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/textView1"
        android:layout_width="70dp"
        android:layout_height="wrap_content"
        android:text="Name :" />
    <EditText 
        android:id="@+id/message"
        android:hint="Message is ******"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

 第二部分：官方提倡讲fragment和viewpager配合使用，接下来就说一下这连个东西如何连起来使用：

简单提一下适配器，适配器，顾名思义，就像是电脑的适配琦，将一个东西经过某种规则映射到另一种g事务上面。适配器中最重要的是getview函数，所以先贴一下Adapter

package adapters;

import java.util.HashMap;
import java.util.LinkedList;

import com.example.maininterface.R;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

public class ImageAdapter extends BaseAdapter {
    private LinkedList<HashMap<String, Object>> list;
    private Context context;
    private LayoutInflater inflater;
    private boolean isItem;

    public ImageAdapter(Context context,
            LinkedList<HashMap<String, Object>> list, boolean isItem) {
        this.list = list;
        this.context = context;
        this.isItem = isItem;
        inflater = LayoutInflater.from(this.context);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public Object getItem(int arg0) {
        return list.get(arg0);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHandler viewHandler = null;
        if (convertView == null) {
            if (isItem) {
                convertView = inflater.inflate(R.layout.item_images_adapter,
                        parent, false);
            } else {
                convertView = inflater.inflate(R.layout.item_imagedir_adapter,
                        parent, false);
            }
            viewHandler = new ViewHandler();
            viewHandler.image = (ImageView) convertView
                    .findViewById(R.id.images_adapter_image);
            viewHandler.textVIew = (TextView) convertView
                    .findViewById(R.id.images_adapter_text);
            convertView.setTag(viewHandler);
        } else {
            viewHandler = (ViewHandler) convertView.getTag();
        }
        Bitmap bitmap = BitmapFactory.decodeFile((String) list.get(position)
                .get("path"));
        viewHandler.image.setImageBitmap(bitmap);
        viewHandler.textVIew.setText((String) list.get(position).get("name"));
        return convertView;
    }

    private class ViewHandler {
        public ImageView image;
        public TextView textVIew;
    }
}

这里东西主要供自己查询已学过的东西，方便记忆，说的不清各位勿怪。

然后看一下重点viewpager：

首先要是想他和fragment的联合使用也要用都适配器：

import java.util.LinkedList;

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.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;

public class FragmentAdapter extends FragmentPagerAdapter implements
        OnPageChangeListener {
    private LinkedList<Fragment> list;
    private int currentIndex = 0;

    public FragmentAdapter(FragmentManager fm, LinkedList<Fragment> list,
            ViewPager viewPager) {
        super(fm);
        this.list = list;
        viewPager.setOnPageChangeListener(this);
    }

    @Override
    public Fragment getItem(int position) {
        return list.get(position);
    }

    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
        // TODO Auto-generated method stub
    }

    @Override
    public void onPageSelected(int position) {
        Animation animation = null;
        animation = new TranslateAnimation(currentIndex, position, 0, 0);
        animation.setFillAfter(true);
        currentIndex = position;
        animation.setDuration(500);
    }
}

然后……好像没什么了……还有一个还可以直接在adapter中为viewpaget添加事件……感觉废话……对！还有，获取fragment的management，一句话就好了。在继承了activity的活动中使用getSupportFragmentManager();返回结果就是FragmentManager。然后关于viewpager还有一个很重要的方法setcurrentItem（int position），设置开始的时候使用哪个view。关于adapter还有一个常用的方法就是更新数据fragmentAdapter.notifyDataSetChanged();