我在第一个活动中有一个列表视图，我notifyDataSetChanged(); 在
onResume()
和
onStart()
但什么也没发生。
当我回到列表视图的活动时，我想重新绘制（刷新）列表视图
代码：
package pit.opensource.customizedlist;
import java.util.ArrayList;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
public class ListViewCustomizedAdapter1Activity extends Activity{
private ArrayList<Order> m_orders = null;
private OrderAdapter m_adapter;
private ListView list;
private Button btnAdd;
private Runnable viewOrders;
private ProgressDialog m_ProgressDialog;
DBHelper db;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
list = (ListView) this.findViewById(R.id.list);
btnAdd = (Button) this.findViewById(R.id.btnAdd);
db = new DBHelper(getApplicationContext());
// db.insertOrder(u);
btnAdd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent i = new Intent(getApplicationContext(),Activity1.class);
startActivity(i);
}
});
m_orders = new ArrayList<Order>();
m_adapter = new OrderAdapter(getApplicationContext(), R.layout.row, m_orders); // data
list.setAdapter(m_adapter);
viewOrders = new Runnable(){ // inner class
@Override
public void run() {
getOrders();
}
};
// Creating a new thread to perform a long-running opertaions, rather than making it in the UI thread
Thread thread = new Thread(viewOrders);
thread.start();
// Showing a simple progress dialog
m_ProgressDialog = ProgressDialog.show(ListViewCustomizedAdapter1Activity.this,
"Please wait...",
"Retrieving data ...",
true);
}
@Override
public void onResume(){
super.onResume();
m_adapter.notifyDataSetChanged();
}
@Override
public void onStart(){
super.onResume();
// to re-bind the list after adding
m_adapter.notifyDataSetChanged();
}
private Runnable r2 = new Runnable(){
@Override
public void run() {
if(m_orders != null && m_orders.size() > 0){
for(int i=0;i<m_orders.size();i++)
m_adapter.add(m_orders.get(i));
}
m_ProgressDialog.dismiss();
//notifyDataSetChanged() : to refresh the DataSet to re-draw the ListView
m_adapter.notifyDataSetChanged();
}
};
// Getting the data, here we fill the data manually and simulate the Network operations
private void getOrders(){
try{
m_orders = new ArrayList<Order>();
/*
Order o1 = new Order();
o1.orderName = "SF services";
o1.orderStatus = "Pending";
o1.id=1;
o1.imgName = "a";
Order o2 = new Order();
o2.orderName = "SF Advertisement";
o2.orderStatus = "Completed";
o2.id = 2;
o2.imgName = "b";
Order o3 = new Order();
o3.orderName = "SF development";
o3.orderStatus = "Completed";
o3.id = 3;
o3.imgName = "c1";
Order o4 = new Order();
o4.orderName = "SF training";
o4.orderStatus = "Completed";
o4.id = 4;
o4.imgName = "c";
m_orders.add(o1);
m_orders.add(o2);
m_orders.add(o3);
m_orders.add(o4);*/
//fill from database
m_orders = db.getAllOrders();
Thread.sleep(5000);
Log.i("ARRAY", ""+ m_orders.size());
} catch (Exception e) {
Log.e("BACKGROUND_PROC", e.getMessage());
}
runOnUiThread(r2);
}
// Here we create a customized ArrayAdapter -----------------------------------------------------
private class OrderAdapter extends ArrayAdapter<Order> {
private ArrayList<Order> items;
Context context;
public OrderAdapter(Context context, int textViewResourceId, ArrayList<Order> items) {
super(context, textViewResourceId, items);
this.items = items;
this.context = context;
}
@Override
public View getView( int position,
View convertView // (ListItem)Row = textView ... etc
, ViewGroup parent) {
View v = convertView;
if (v == null) {
// LayoutInflater: to convert the 'layout XML file' to a corresponding Java 'View' object
// getSystemService(): A system level service to retrieve the LayoutInflater
LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
}
Order o = items.get(position);
if (o != null) {
TextView tt = (TextView) v.findViewById(R.id.toptext);
TextView bt = (TextView) v.findViewById(R.id.bottomtext);
Button btn = (Button) v.findViewById(R.id.btnMore);
ImageView img = (ImageView) v.findViewById(R.id.icon);
tt.setText("Name: "+o.orderName);
bt.setText("Status: "+ o.orderStatus);
Log.d("Adpdter status",o.orderStatus);
// To get Image ID using the image name ---------
try{
if(o.imgName!=null){
int resID = getResources().getIdentifier(o.imgName, "drawable", getPackageName());
img.setImageDrawable(getResources().getDrawable(resID));
}else{
img.setImageDrawable(getResources().getDrawable(R.drawable.ic_launcher));
}
}catch(Exception ex){}
btn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
//btn.en
Intent i = new Intent(getApplicationContext(),Activity1.class);
// i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
// startActivity(i);
}
});
}
return v;
}
}
}