Android's ToDoList (fragment) detailed

Fragment (fragmentation) can be flexible to add or remove Fragment from an active activity and have a good user experience;

Here is the specific design of the fragment:

1. Create a new_item_fragment resource file:

Location: Res->new_item_fragment.xml

<?xml version= "1.0" encoding= "Utf-8"?> <edittext xmlns:android=  
      
"http://schemas.android.com/apk/res/" Android "
    android:id=" @+id/myedittext "
    android:layout_width=" match_parent "
    android:layout_height=" Wrap_content "
    android:hint=" @string/additemhint "
    android:contentdescription=" @string Additemcontentdescription "
 />

Contains a EditText control;

2. Create a logical implementation of newitemfragment:

Location: Java->package->newitemfragment.java

Package Mzx.spike.todolist.app;  
Import android.app.Activity;  
Import android.app.Fragment;  
Import Android.os.Bundle;  
Import android.view.KeyEvent;  
Import Android.view.LayoutInflater;  
Import Android.view.View;  
Import Android.view.ViewGroup;  
      
Import Android.widget.EditText; 
 /** * Created by C.l.wang on 14-3-14.  
      
    * * public class Newitemfragment extends fragment{private Onnewitemaddedlistener onnewitemaddedlistener;  
    Listener Event public interface Onnewitemaddedlistener {public void onnewitemadded (String newitem);  
                             @Override public View Oncreateview (layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) {View view = Inflater.inflate (R.layout.new_item_fragment, Conta  
      
        Iner, false);  
      
        Final EditText Myedittext = (edittext) View.findviewbyid (R.id.myedittext); Listener Event Myedittext.setonkeylistener (nEW View.onkeylistener () {@Override public boolean onkey (view view, int i, keyevent keyevent) { if (keyevent.getaction () = = Keyevent.action_down) if ((i = = Keyevent.keycode_dpad_  
                       CENTER) | | (i = = Keyevent.keycode_enter))  
                        {String newitem = Myedittext.gettext (). toString ();  
                        Onnewitemaddedlistener.onnewitemadded (NewItem);  
                        Myedittext.settext ("");  
                    return true;  
            return false;  
      
        }  
        });  
    return view;  
      
        }//bind to activity public void Onattach (activity activity) {Super.onattach (activity);  
        try {Onnewitemaddedlistener = (onnewitemaddedlistener) activity; catch (ClassCastException e) {throw new ClassCastException (activity.tostring () + "Must implement Onnewitemaddedlistener "); }  
    }  
      
}

Detailed

1. Inheritance of the fragment category;

2. Listener interface (interface Onnewitemlistener), including a listening method (onnewitemadded), and then implement an instance;

3. Create a view (Oncreateview), you need to return a view;

4. Populate a view, call the Inflater.inflate () function, bind the fragment resource file;

5. Obtains the reference of the control, View.findviewbyid (), obtains the Myedittext the reference;

6. Monitor the event, listen to the input content of Myedittext, pass to the content of the interface (new Item);

7. Use the Onattach () function, bind the acitivity, and obtain a reference to the activity;

3. Create a logical implementation of todolistfragment:

Location: Java->package->todolistfragment.java

Package Mzx.spike.todolist.app;  
      
Import android.app.ListFragment;  
      
/** 
 * Created by C.l.wang on 14-3-14. 
 */Public
class Todolistfragment extends listfragment{  
}

Inheriting listfragment;

4. Create the Activity_to_do_list resource file, the activity resource file:

Location: Res->layout->activity_to_do_list.xml

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http:// Schemas.android.com/tools "android:orientation=" vertical "android:layout_width=" match_parent "Android:layout_h" eight= "Match_parent" android:paddingleft= "@dimen/activity_horizontal_margin" android:paddingright= "@dimen Activity_horizontal_margin "android:paddingtop=" @dimen/activity_vertical_margin "android:paddingbottom=" @dimen Activity_vertical_margin "tools:context=" mzx.spike.todolist.app.ToDoListActivity "> <fragment androi D:name= "Mzx.spike.todolist.app.NewItemFragment" android:id= "@+id/newitemfragment" Android:layout_width= "Ma Tch_parent "android:layout_height=" wrap_content "android:hint=" @string/additemhint "Android:conten tdescription= "@string/additemcontentdescription"/> <fragment android:name= "Mzx.spike.todolist.app . Todolistfragment "Android:id=" @+id/todolistfragment "android:layout_width=" match_parent "android:layout_height=" wrap_content "/> </Li Nearlayout>

LinearLayout contains two fragment nodes, which need to provide android:name parameters to achieve;

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