public class ListViewMainActivity extends ListActivity {
// declare class variables
private ArrayList<Item> m_parts = new ArrayList<Item>();
private Runnable viewParts;
private ItemAdapter m_adapter;
Dbhelper mydb =new Dbhelper(this);
ArrayList<Item> abc = new ArrayList<Item>();;
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// instantiate our ItemAdapter class
m_adapter = new ItemAdapter(this, R.layout.list_item, abc);
setListAdapter(m_adapter);
// here we are defining our runnable thread.
viewParts = new Runnable(){
public void run(){
handler.sendEmptyMessage(0);
}
};
// here we call the thread we just defined - it is sent to the handler below.
Thread thread = new Thread(null, viewParts, "MagentoBackground");
thread.start();
}
private Handler handler = new Handler()
{
public void handleMessage(Message msg)
{
// create some objects
// here is where you could also request data from a server
// and then create objects from that data.
abc = mydb.getweek();
m_adapter = new ItemAdapter(ListViewMainActivity.this, R.layout.list_item, abc);
// display the list.
setListAdapter(m_adapter);
}
};
}
适配器代码：
package com.example.myexpenses;
import java.util.ArrayList;
公共类ItemAdapter扩展了ArrayAdapter {
// declaring our ArrayList of items
private ArrayList<Item> objects;
Context context;
/* here we must override the constructor for ArrayAdapter
* the only variable we care about now is ArrayList<Item> objects,
* because it is the list of objects we want to display.
*/
public ItemAdapter(Context context, int textViewResourceId, ArrayList<Item> objects) {
super(context, textViewResourceId, objects);
this.context = context;
this.objects = objects;
}
/*
* we are overriding the getView method here - this is what defines how each
* list item will look.
*/
public View getView(int position, View convertView, ViewGroup parent){
// assign the view we are converting to a local variable
View v = convertView;
// first check to see if the view is null. if so, we have to inflate it.
// to inflate it basically means to render, or show, the view.
if (v == null)
{ LayoutInflater inflater =（LayoutInflater）getContext（）。getSystemService（Context.LAYOUT_INFLATER_SERVICE）; v = inflater.inflate（R.layout.list_item，null）; }
Item i = objects.get(position);
if (i != null) {
// This is how you obtain a reference to the TextViews.
// These TextViews are created in the XML files we defined.
TextView ttd = (TextView) v.findViewById(R.id.toptextdata);
TextView mtd = (TextView) v.findViewById(R.id.middletextdata);
TextView bt = (TextView) v.findViewById(R.id.bottomtext);
// check to see if each individual textview is null.
// if not, assign some text!
if (ttd != null){
ttd.setText(i.getName());
}
if (mtd != null){
mtd.setText("$" + i.getPrice());
}
if (bt != null){
bt.setText(i.getDetails());
}
}
// the view must be returned to our activity
return v;
}
}