Android 之 Fragment

我就是我 2021-12-13 23:57 294阅读 0赞

# 一  左侧标题列表 #

##      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 #

![20130909145229984][]

**转载请注明出处 ：）**

转载于:https://www.cnblogs.com/james1207/p/3310854.html

[20130909145229984]: /images/20211213/9328d4dd46ce4f679e8ae459a726e89e.png