Android ToDoList (custom arrayadapter)

Environment: Android Studio 0.5.1

Arrayadapter uses a generic (template) to bind the adapter view to an array of objects of the specified class;

Custom Arrayadapter need to rewrite the GetView () method to assign object attributes to the layout view;

ToDoList add time after each item, you need to create Todoitem object, use custom Arrayadapter;

Steps:

1. Create a Todoitem object

Location: Java->package->todoitem

Package Mzx.spike.todolist.app;  
      
Import Java.text.SimpleDateFormat;  
Import java.util.Date;  
      
/** 
 * Created by the Administrator on 14-3-17 
 . *
/public class Todoitem {  
    String task;  
    Date created;  
      
    Public String Gettask () {return  
        task;  
    }  
      
    Public Date getcreated () {return  
        created;  
    }  
      
    Public Todoitem (String _task) {This  
        (_task, New Date (Java.lang.System.currentTimeMillis ()));  
      
    Public Todoitem (String _task, Date _created) {  
        task = _task;  
        created = _created;  
    }  
      
    @Override public
    String toString () {  
        SimpleDateFormat sdf = new SimpleDateFormat ("Dd/mm/yy");  
        String datestring = Sdf.format (created);  
        Return "(" + datestring + ")" + task;  
    }  
}

Detailed

Two private variables, storing tasks and dates (date), two methods of construction, overriding the ToString method;

2. Modify Todolist_item layout (XML)

Location: Res->layout->todolist_item.xml

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android= "Http://schemas.android.com/ap" K/res/android "android:layout_width=" match_parent "android:layout_height=" match_parent "> <TextV Iew android:id= "@+id/rowdate" android:layout_width= wrap_content "android:layout_height=" Match_par Ent "android:background=" @color/notepad_paper "android:padding=" 10DP "android:scrollbars=" vertical "Android:requiresfadingedge=" vertical "android:textcolor=" "#F000" android:layout_alignparentright= "True"/> <mzx.spike.todolist.app.todolistitemview android:id= "@+id/row" android:l Ayout_width= "Match_parent" android:layout_height= "match_parent" android:padding= "10DP" ANDROID:SCR ollbars= "vertical" android:requiresfadingedge= "vertical" android:textcolor= "@color/notepad_text" a Ndroid:layout_toleftof= "@+id/rowdate "/> </RelativeLayout> 

Detailed

1. Use Relativelayout (related) layout;

2. TextView Storage date (dates);

3. Todolistitemview (custom, Java) storage tasks (Task);

4. Layout_toleftof property, representing the left side of a view;

5. Fadingedge label, Fade Edge, abandon, be replaced by Requiresfadingedge label;

3. Create Todoitemadapter, custom adapters

Location: Java->package->todoitemadapter

Package Mzx.spike.todolist.app;  
Import Android.content.Context;  
Import Android.view.LayoutInflater;  
Import Android.view.View;  
Import Android.view.ViewGroup;  
Import Android.widget.ArrayAdapter;  
Import Android.widget.LinearLayout;  
      
Import Android.widget.TextView;  
Import Java.text.SimpleDateFormat;  
Import Java.util.Date;  
      
Import java.util.List; 
 /** * Created by the Administrator on 14-3-17.  
      
    * * public class Todoitemadapter extends arrayadapter<todoitem> {int resource; Public Todoitemadapter (context, int _resource, list<todoitem> items) {Super (context, _resource, I  
        TEMS);  
    This.resource = _resource; @Override public View getview (int position, View Convertview, ViewGroup parent) {Linearlayou  
      
        T Todoview;  
      
        Todoitem item = getitem (position);  
        String taskstring = Item.gettask ();  
  Date createddate = item.getcreated ();      SimpleDateFormat SDF = new SimpleDateFormat ("Dd/mm/yy");  
      
        String datestring = Sdf.format (createddate);  
            if (Convertview = = null) {Todoview = new LinearLayout (GetContext ());  
            String inflater = Context.layout_inflater_service;  
            Layoutinflater Li;  
            Li = (layoutinflater) getcontext (). Getsystemservice (Inflater);  
        Li.inflate (Resource, Todoview, true);  
        else {Todoview = (linearlayout) Convertview;  
        } TextView Dateview = (TextView) Todoview.findviewbyid (r.id.rowdate);  
      
        TextView Taskview = (TextView) Todoview.findviewbyid (R.id.row);  
        Dateview.settext (datestring);  
      
        Taskview.settext (taskstring);  
    return todoview; }  
}

Detailed

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