Mobile Video The third day, by listening to the bottom Radiogroup button state to switch the contents of the middle Fragmentlayout

Mainly the use of fragment, the steps to switch fragment are as follows

1, Get Fragmentmanager instance, but need mainactivity extends fragmentactivity to get Fragmentmanager.

Through Fragmentmanager Fragmentmanager=getsupportfragmentmanager ();

2, open transaction, a bit like the hibernate operation database in Java EE

Fragmenttranaction tranaction= fragmentmanager.begintranction ();

3. Replace fragment with transactions

Tranaction.replace (r.id.fl_main_content,fragment); The first one in the parameter represents the Fragmentlayout container, where the fragment is placed, and the second represents the fragment instance

4. Commit a transaction

Tranaction.commit ();

Here is a general description of today's main content:

1, create a base class Basepager, initialize the data inside, here first defines a view, as the test fragmentlayou display content.

2, create four sub-classes, inherit Basepager, respectively is Videopager,audiopager,netvideopager,netaudiopager

3, create a new set in the Mainactivity, in the activity of the OnCreate () in the collection instance new out, and added to the collection of four instances of subclasses.

4, through the Radiogroup Oncheckedchangedlistener () to monitor the status of RadioButton, to switch fragment

5, through the above listening class OnCheckedChanged method, to determine which RadioButton is selected, and then get the example, further to get the view, and then switch fragement to display different pages.

The specific code is as follows

1, Basepager

package com.yuanlp.mobileplayer.base;import android.content.context;import android.view.view;/* * * created by  Yuriping  on 2017/7/13. *  base class  */public abstract  class BasePager {    /**     *  This is the context, which is used after the subclass , so write for public     *     */    public  final context context;    public view rootview;     public boolean isinitdata;    public basepager (Context context) {         this.context=context;         rootview=initview ();    }    /**      *  force subclasses to achieve specific effects      *  @return      */     public aBstract view initview ();    /**     *  when subclasses are initialized, When you need to network request data, or when binding data, you need to rewrite the method      */    public void  InitData () {    }}

2, Videopager, the other three will not write, very similar.

package com.yuanlp.mobileplayer.pager;import android.content.context;import  android.graphics.color;import android.view.gravity;import android.view.view;import  android.widget.textview;import com.yuanlp.mobileplayer.base.basepager;import  com.yuanlp.mobileplayer.utils.logutil;/** * created by  原立鹏  on 2017/7/13. *   Local Video page  */public class VideoPager extends BasePager {     public textview textview;    public videopager (Context context)  {        super (context);    }     /**     *  forcing subclasses to achieve specific effects      *      *  @return      */     @Override      public view initview ()  {        LOGUTIL.E ("Local video is initialized");         textview=new  textview (context);         textview.settextsize (+);         textview.setgravity (Gravity.center);         textview.settextcolor (color.red);        return  textview;    }     @Override     public void  initdata ()  {        super.initdata ();         LOGUTIL.E ("The data for the local video page is initialized");         Textview.settext ("Local video page");     }}

3, Mainactivity

package com.yuanlp.mobileplayer.activity;import android.os.bundle;import  android.support.annotation.idres;import android.support.annotation.nullable;import  android.support.v4.app.fragment;import android.support.v4.app.fragmentactivity;import  android.support.v4.app.fragmentmanager;import android.support.v4.app.fragmenttransaction;import  android.view.layoutinflater;import android.view.view;import android.view.viewgroup;import  Android.widget.framelayout;import android.widget.radiogroup;import com.yuanlp.mobileplayer.r;import  com.yuanlp.mobileplayer.base.BasePager;import com.yuanlp.mobileplayer.pager.AudioPager;import  Com.yuanlp.mobileplayer.pager.netaudiopager;import com.yuanlp.mobileplayer.pager.netvideopager;import  com.yuanlp.mobileplayer.pager.videopager;import java.util.arraylist;import java.util.list;/**  *  Home  * Created by  Yuriping  on 2017/7/12.&Nbsp;*/public class mainactivity extends fragmentactivity{    private  FrameLayout fl_main_content;    private RadioGroup rg_bottom_tag;     /**     *  Local Page Collection      */     public static list<basepager> basepagers;    /**      *  Selected Location      */    public  static int position;     @Override     protected void  oncreate (bundle savedinstancestate)  {         Super.oncreate (savedinstancestate);         setcontentview ( R.layout.activity_main);        fl_main_content=  (FrameLayout)  findviewbyid (r.id.fl_main_content);         rg_bottom_tag=  (Radiogroup)  findviewbyid (R.id.rg_bottom_tag );        basepagers=new arraylist<basepager> ();         basepagers.add (New videopager (this));  //Local video    Location is 0        basepagers.add (New audiopager (this));   // Local music   location is 1        basepagers.add (New netvideopager (this));   //Network Video   location is 2        basepagers.add (new  Netaudiopager (this));   //Network music   location is 3        // Here set the Radiogroup monitor         rg_bottom_tag.setoncheckedchangelistener (new  myoncheckedchangelistener ());         rg_bottom_tag.check (R.id.rb _video)   //Local video  &nbs of the home page is selected by defaultp;  }    class myoncheckedchangelistener implements  radiogroup.oncheckedchangelistener{        /**          * <p>called when the checked radio button  has changed. When the         *  selection is cleared, checkedid is -1.</p>          *         *  @param  group      the group in which the checked radio button has  changed         *  @param  checkedId the  unique identifier of the newly checked radio button          */         @Override         public  Void oncheckedchanged (radiogroup group,  @IdRes  int checkedid)  {             switch  (Checkedid) {                 default:                     position=0;                      break;                 case r.id.rb_audio:  //selected local music                      position=1;                     break;                 case r.id.rb_video:  //selected Local Video                       position=0;                     break;                 case r.id.rb_net_audio:  //selected is the network music                      position=3;                     break;                 case  r.id.rb_net_video:  //selectedis the network video                      position=2;                     break;             }            //put the created page into fragment              setfragment ();         }        private void setfragment ()  { Steps to             //fragment      &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;//1, Get fragmentmanager             fragmentmanager fragmentmanager = getsupportfragmentmanager ();    &nBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;//2, open transactions              fragmenttransaction transaction = fragmentmanager.begintransaction (); &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;//3, replacing fragement                         transaction.replace (R.id.fl_main_content,new myfragment ());      &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;//4, submit Transactions              transaction.commit ();         }    }     public static class myFragment extends Fragment{          @Nullable          @Override        &Nbsp; public view oncreateview (layoutinflater inflater,  @Nullable  viewgroup  container,  @Nullable  bundle savedinstancestate)  {             basepager b1=getbasepager ();             if  (b1!=null) {                 return b1.rootview;             }             return null;        }    }     public static basepager getbasepager ()  {         basepager basepager=basepagers.get (position);         if   (Basepager!=null&&!basEpager.isinitdata) {             basepager.isinitdata=true;             Basepager.initdata ();   //initialize page data, invoke InitData () method in each page class              return basepager;        }         return basepager;    }}

It is important to note that when replacing the Fragment step in Mainactivity, the second argument cannot write an anonymous inner class such as new Fragment () {}, otherwise it will be an error: Fragment null must be a public static class The reason for this error of properly recreated from is that the V4 package is upgraded to 25, fragment must be used as a static class for public. The specific use of the method can be referenced by my code.

This article is from the "Yuangushi" blog, make sure to keep this source http://cm0425.blog.51cto.com/10819451/1947356

Mobile Video The third day, by listening to the bottom Radiogroup button state to switch the contents of the middle Fragmentlayout