Android-ToDoList (custom ArrayAdapter)

ToDoList (custom ArrayAdapter)

Address: http://blog.csdn.net/caroline_wendy/article/details/21401907

For more information about the pre-project, see: Http://blog.csdn.net/caroline_wendy/article/details/21330733

Environment: Android Studio 0.5.1

ArrayAdapterUse a generic (Template)Adapter ViewBind to a specifiedArray of class objects;

Custom ArrayAdapter needs to be rewrittenGetView ()Method to allocate object attributes to the Layout View;

ToDoListAdd a time after each item. You need to createToDoItemObject.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 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;    }}

Details:

Two private variables, storageTask and date), The two constructor methods are rewritten.ToStringMethod;

2. Modify todolist_item layout (xml)

Location: res-> layout-> todolist_item.xml

Details:

1. UseRelativeLayout (related)Layout;

2.TextViewStorage date );

3.ToDoListItemView (custom, java)Storage task );

4.Layout_toLeftOfAttribute, indicating to the left of a view;

5. fadingEdge tag, remove the edge,Abandon, IsRequiresFadingEdgeLabel substitution;

3. Create ToDoItemAdapter and customize the adapter

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 Administrator on 14-3-17. */public class ToDoItemAdapter extends ArrayAdapter
 
   {    int resource;    public ToDoItemAdapter(Context context, int _resource, List
  
    items) {        super(context, _resource, items);        this.resource = _resource;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        LinearLayout 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;    }}
  
 

Details:

1. constructor, parameters:View content, resource ID, array;

2. RewriteGetView ()To allocate object attributes to the Layout View;

3.GetItem, Get the project from position. The first update needs to fill the view, and then convert it;

4. Copy the corresponding attribute and find it from the view.Resource reference (findViewById), Assign values to resources;

5. Return to the view;

4. Modify ToDoListActivity implementation and replace String with ToDoItem object.

Location: java> package> ToDoListActivity

Package mzx. spike. todolist. app; import android. app. fragmentManager; import android. OS. bundle; import android. support. v7.app. actionBarActivity; import android. view. menu; import android. view. menuItem; import java. util. arrayList; public class ToDoListActivity extends ActionBarActivity implements NewItemFragment. onNewItemAddedListener {// use the ToDoItem object instead of String private ToDoItemAdapter aa; private ArrayList
 
  
ToDoItems; @ Override protected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_to_do_list); // get the fragment reference FragmentManager fm = getFragmentManager (); ToDoListFragment toDoListFragment = (ToDoListFragment) fm. findFragmentById (R. id. toDoListFragment); toDoItems = new ArrayList
  
   
(); Int resID = R. layout. todolist_item; // three parameters: aa = new ToDoItemAdapter (this, resID, toDoItems); toDoListFragment. setListAdapter (aa);} // override the interface method public void onNewItemAdded (String newItem) {ToDoItem newToDoItem = new ToDoItem (newItem); toDoItems. add (0, newToDoItem); aa. policydatasetchanged () ;}@ Override public boolean onCreateOptionsMenu (Menu menu) {// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater (). inflate (R. menu. to_do_list, menu); return true ;}@ Override public boolean onOptionsItemSelected (MenuItem item) {// Handle action bar item clicks here. the action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest. xml. int id = item. getItemId (); if (id = R. id. action_settings) {return true;} return super. onOptionsItemSelected (item );}}
  
 

Details:

ReplaceString is ToDoItem, ReplaceArrayAdapter <> ToDoItemAdapter;

5. Execute the program

Code: http://download.csdn.net/detail/u012515223/7054943