Android 之 Fragment

一 左侧列表展示

1.1 布局 left_fragment.xml

<ListView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@android:color/darker_gray"
    android:listSelector="@drawable/onitem_selected_bkcolor"/>

1.2 ListSelector onitem_selected_bkcolor.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item 
        android:state_window_focused="false"
        android:drawable="@android:color/holo_green_dark"/>
    <item
        android:state_window_focused="true"
        android:drawable="@android:color/holo_green_light"/>
</selector>

1.3 自定义 ListItem 布局 代替 android.R.layout.simple_list_item_1

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="30dp"
    android:gravity="center_vertical"
    android:paddingLeft="10dp"
    android:textColor="@android:color/black"/>

1.4 自定义 LeftFragment

package com.example.myfragments;
import android.app.Activity;
import android.app.ListFragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
//自定义回调函数
interface onItemSeletedListener
{
    public void onItemSeleted(int position); 
}
public class LeftFragment extends ListFragment {
    onItemSeletedListener mCallback;
    
    String[] data = {"item0","item1","item2","item3","item4","item5","item6","item7","item8","item9","item10","item11","item12","item13","item14","item15","item16"}; 
    
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        return inflater.inflate(R.layout.left_fragment, container,false);
    }
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        setListAdapter(new ArrayAdapter<String>(getActivity(),  
                   R.layout.listitem, data)); 
        super.onActivityCreated(savedInstanceState);
    }
    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        // TODO 自动生成的方法存根
        mCallback.onItemSeleted(position);        
    }
    
    @Override
    public void onAttach(Activity activity) {
        // TODO 自动生成的方法存根
        super.onAttach(activity);
        // This makes sure that the container activity has implemented  
        // the callback interface. If not, it throws an exception  
        try {  
            mCallback = (onItemSeletedListener) activity;  
        } catch (ClassCastException e) {  
            throw new ClassCastException("必须实现 onItemSeletedListener");
        }  
    }
}

二 右侧内容展示

2.1 布局 right_fragment.xml

<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:background="@android:color/background_dark"
    android:orientation="vertical"
    tools:ignore="HardcodedText,UselessParent" >
    <ScrollView 
        android:scrollbars="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        <TextView
            android:id="@+id/textview"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="请选择左侧边栏 :)"
            android:textColor="@android:color/holo_orange_dark"
            android:textSize="30sp" />
    </ScrollView>
</LinearLayout>

2.1 自定义 RightFragment

package com.example.myfragments;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class RightFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        // TODO 自动生成的方法存根
        return inflater.inflate(R.layout.right_fragment, container,false);
    }
    
    //更新数据
    public void update(int position)
    {
        TextView textview=(TextView)getActivity().findViewById(R.id.textview);
        textview.setText("您选择了：" + String.valueOf(position)+"\n--------------"
                +"\n大江东去浪淘尽，\n千古风流人物，\n故垒西边，\n人道是，\n三国周郎赤壁，\n乱石穿空，\n惊涛拍岸，\n卷起千堆雪，\n江山如画，\n一时多少豪杰。"
                +"\n遥想公瑾当年，\n小乔初嫁了，\n雄姿英发，\n羽扇纶巾，\n谈笑间，\n樯橹灰飞烟灭，\n故国神游，\n多情应笑我，\n早生华发，\n人间如梦，\n一樽还酹江月。");
    }
}

三 添加到 main_layout.xml 中，附着于 Activity 显示

3.1布局 main_layout.xml

<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"
    tools:ignore="DisableBaselineAlignment" >
    <fragment
        android:id="@+id/left_fragment"
        android:name="com.example.myfragments.LeftFragment"
        android:layout_width="70dp"
        android:layout_height="match_parent"/>
    <View 
        android:layout_width="2dp"
        android:layout_height="match_parent"
        android:background="@android:color/background_dark"/>
    <fragment
        android:id="@+id/right_fragment"
        android:name="com.example.myfragments.RightFragment"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"/>
</LinearLayout>

3.2 MainActivity

package com.example.myfragments;
import android.app.Activity;
import android.os.Bundle;
import android.view.Window;
import android.view.WindowManager;
public class MainActivity extends Activity implements onItemSeletedListener{
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);   
        requestWindowFeature(Window.FEATURE_NO_TITLE);   
        setContentView(R.layout.main_layout);     
        
//        //添加
//        FragmentManager fragmentmanager=getFragmentManager();
//        FragmentTransaction fragmenttransaction=fragmentmanager.beginTransaction();
//        LeftFragment leftfragment=new LeftFragment();
//        fragmenttransaction.add(R.id.left_fragment, leftfragment);
//        fragmenttransaction.commit();
//        //删除
//        FragmentManager fragmentmanager=getFragmentManager();
//        FragmentTransaction fragmenttransaction=fragmentmanager.beginTransaction();
//        Fragment leftfragment=fragmentmanager.findFragmentById(R.id.left_fragment);
//        fragmenttransaction.remove(leftfragment);
//        fragmenttransaction.commit();
//        //替换
//        FragmentManager fragmentmanager=getFragmentManager();
//        FragmentTransaction fragmenttransaction=fragmentmanager.beginTransaction();
//        fragmenttransaction.replace(R.id.left_fragment, new LeftFragment());
//        fragmenttransaction.commit();
    }
    @Override
    public void onItemSeleted(int position) {
        RightFragment rightFragment=(RightFragment) getFragmentManager().findFragmentById(R.id.right_fragment);
        
        if(rightFragment != null)
            rightFragment.update(position);
    }
}

四 结果展示

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