Fragment 的应用

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Android

最近android项目需要用到Fragment，就抽空要久了一下Fragment，记录下。

一、项目效果图

二、整个activity分上下两个Fragment，上面是ListView的列表，下面是详细内容的Fragment。

看先看activity_main 的布局：

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <LinearLayout
        android:id="@+id/activity_person_info_fragment_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >
    </LinearLayout>

    <LinearLayout
        android:id="@+id/ll_detail_view"
        android:layout_width="match_parent"
        android:layout_height="100dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:orientation="vertical"
        android:layout_alignParentBottom="true" >
    </LinearLayout>

</RelativeLayout>

fragment_list.xml

<?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" >

    <ListView
        android:id="@+id/fragment_listview"
        android:layout_width="fill_parent"
        android:layout_height="450dp" >
    </ListView>

</LinearLayout>

fragment_detail.xml

<?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" >

    <ScrollView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical" >

            <TextView
                android:id="@+id/detail_textview"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="5dp"
                android:lines="50" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>

list_item.xml listViewAdapter需要

<?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="horizontal" >

    <ImageView
        android:id="@+id/image"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:layout_marginLeft="5dp"
        android:contentDescription="@null" />

    <TextView
        android:id="@+id/text_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_marginLeft="10dp" />

</LinearLayout>

接下里看看Avtivity代码：

ListInfoFragment.java

package com.johnny.fragmentdemo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class ListInfoFragment extends BaseFragment {
	
	private ListView listView;
	private ListInfoAdapter listAdapter;
	private List<Map<String,Object>> list;
	private int resid [] = {R.drawable.mingren,R.drawable.zuozhu,R.drawable.ying,R.drawable.kakaxi,R.drawable.you};
	private String titles [] = {"漩涡鸣人","宇智波佐助","春野樱","旗木卡卡西","宇智波鼬"};
	private int conntets [] = {R.string.mingren,R.string.zuozhu,R.string.ying,R.string.kakaxi,R.string.you};
	
	private Context mContext;
	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		mContext = this.getActivity();
		dataInit();
	}

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

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		
		//加载frangement
		View fragmentView = inflater.inflate(R.layout.fragment_list, container, false);
		setFragmentView(fragmentView);
		viewInit();
		return fragmentView;
		
	}
	
	private void viewInit(){
		listView = (ListView) findViewById(R.id.fragment_listview);
		listAdapter = new ListInfoAdapter();
		listView.setAdapter(listAdapter);
		
		listView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// TODO Auto-generated method stub
				//获取详细内容的Fragment,通过Activity获取
				DetailInfoFragment fragment = ((MainActivity)ListInfoFragment.this.getActivity()).getDetailInfoFragment();
				if(fragment != null){
					switch (position) {
					case 0:
						fragment.getOnDetailInfoListener().setContent(getString(conntets[0]));
						break;
					case 1:
						fragment.getOnDetailInfoListener().setContent(getString(conntets[1]));
						break;
					case 2:
						fragment.getOnDetailInfoListener().setContent(getString(conntets[2]));
						break;
					case 3:
						fragment.getOnDetailInfoListener().setContent(getString(conntets[3]));
						break;
					case 4:
						fragment.getOnDetailInfoListener().setContent(getString(conntets[4]));
						break;

					default:
						break;
					}
				}
			}
			
		});
	}
	
	private void dataInit(){
		list = new ArrayList<Map<String,Object>>();
		for(int i=0;i<resid.length;i++){
			Map<String ,Object> map = new HashMap<String,Object>();
			map.put("title", titles[i]);
			map.put("image", resid[i]);
			list.add(map);
		}
	}
	
	private class ListInfoAdapter extends BaseAdapter{

		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return list.size();
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return list.get(position);
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return position;
		}

		@SuppressWarnings("unused")
		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			ListInfoHolder holder = null;
			if(holder == null){
				holder = new ListInfoHolder();
				if(convertView == null){
					convertView = LayoutInflater.from(mContext).inflate(R.layout.list_item, null);
				}
				holder.imageview = (ImageView) convertView.findViewById(R.id.image);
				holder.textView = (TextView) convertView.findViewById(R.id.text_view);
				convertView.setTag(holder);
			}else{
				holder = (ListInfoHolder)convertView.getTag();
			}
			
			Map<String,Object> map = list.get(position);
			holder.imageview.setImageResource((Integer)map.get("image"));
			holder.textView.setText((String)map.get("title"));
			return convertView;
		}
		
	}
	
	private class ListInfoHolder{
		ImageView imageview;
		TextView textView;
	}
	
}

DetailInfoFragment.java

package com.johnny.fragmentdemo;

import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class DetailInfoFragment extends BaseFragment {
	
	private Context mContext;
	
	private TextView textView;
	
	private OnDetailInfoListener onDetailInfoListener;
	
	
	/**
	 * @author 
	 * 定义接口
	 */
	public interface OnDetailInfoListener{
		public void setContent(String content);
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		mContext = this.getActivity();
		//实现接口
		onDetailInfoListener = new OnDetailInfoListener(){

			@Override
			public void setContent(String content) {
				// TODO Auto-generated method stub
				textView.setText(content);
			}
		};
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		View fragmentView = inflater.inflate(R.layout.fragement_detail, container,false);
		setFragmentView(fragmentView);
		viewInit();
		return fragmentView;
	}
	
	private void viewInit(){
		textView = (TextView) findViewById(R.id.detail_textview);
		
	}

	public OnDetailInfoListener getOnDetailInfoListener() {
		return onDetailInfoListener;
	}

	public void setOnDetailInfoListener(OnDetailInfoListener onDetailInfoListener) {
		this.onDetailInfoListener = onDetailInfoListener;
	}

}

MainActivity.java

package com.johnny.fragmentdemo;

import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

public class MainActivity extends FragmentActivity {
	
	private ListInfoFragment listInfoFragment;
	private DetailInfoFragment detailInfoFragment;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		viewInit();
		
	}
	
	private void viewInit(){
		listInfoFragment = new ListInfoFragment();
		detailInfoFragment = new DetailInfoFragment();
		getSupportFragmentManager().beginTransaction().
		add(R.id.activity_person_info_fragment_layout,listInfoFragment).
		add(R.id.ll_detail_view,detailInfoFragment).
		commit();
	}
	
	public DetailInfoFragment getDetailInfoFragment() {
		return detailInfoFragment;
	}

}