我在这里很困惑，我想在listview之后刷新deleting any item。我只是使用intentand call the same activity，但它不起作用。那么请提出任何其他技巧或想法。my sample code在下面：
update_page.java
protected Object adapter;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.update_list);
final ProgressDialog myPd_ring=ProgressDialog.show(update_page.this, "Please wait", "Login please wait..", true);
myPd_ring.setCancelable(true);
myPd_ring.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
new Thread() {
public void run() {
try{
sleep(1000);
} catch (Exception e) {
Log.e("tag", e.getMessage());
}
// dismiss the progress dialog
myPd_ring.dismiss();
}
}.start();
myview = (ListView)this.findViewById(R.id.list);
ctx=this;
database = act.getInstance().openOrCreateDatabase("contactsManager",
SQLiteDatabase.CREATE_IF_NECESSARY, null);
Toast.makeText(getApplicationContext(), "Database is open", 1500).show();
// database=this.openOrCreateDatabase("contactsManager", SQLiteDatabase.CREATE_IF_NECESSARY,null);
final String[] columnsone={"_id","task_name","date_time"};
String[] columnstwo={"task_name","date_time"};
int to[] = {R.id.lbl_task,R.id.lbl_datetime};
c = database.query("contacts", columnsone, null, null, null, null, null);
status=c.getCount();
Toast.makeText(getApplicationContext(), "totle task :" +status, 1500).show();
if(c!=null)
{
Toast.makeText(getApplicationContext(), "in courser", 1500).show();
SimpleCursorAdapter adapter=new
SimpleCursorAdapter(update_page.this,R.layout.update_listview, c, columnstwo, to);
Toast.makeText(getApplicationContext(), "records are in list", 1500).show();
myview.setAdapter(adapter);
myview.setOnItemLongClickListener(new OnItemLongClickListener()
{
public boolean onItemLongClick(AdapterView<?> arg0,
View record, int arg2, long arg3)
{
update_page.this.registerForContextMenu(record);
/*task= ((TextView)record.findViewById(R.id.lbl_task)).getText().toString();
date_time1= ((TextView)record.findViewById(R.id.lbl_datetime)).getText().toString();
Toast.makeText(getApplicationContext(), "task is"+task, 1500).show();
database = act.getInstance().openOrCreateDatabase("contactsManager",
SQLiteDatabase.CREATE_IF_NECESSARY, null);
String query = "SELECT _id FROM contacts WHERE task_name='"+task + "&date_time="+date_time1+"'";
c=database.rawQuery(query, null);
c.moveToNext();
new_id=c.getInt(c.getColumnIndex("_id"));
*/
return false;
}
});
}
}
//@Override
public boolean onContextItemSelected(MenuItem item)
{
AdapterContextMenuInfo menuInfo = (AdapterContextMenuInfo)item.getMenuInfo();
int choice = item.getItemId();
switch(choice)
{
case 1:
Toast.makeText(getApplicationContext(), "Update Task", 2000).show();
/*Intent op_intent = new Intent(update_page.this,MainActivity.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
op_intent.putExtra("task_id", new_id);
op_intent.putExtra("task", task);
op_intent.putExtra("datetime", date_time1);
update_page.this.startActivity(op_intent);*/
break;
case 2:
Toast.makeText(getApplicationContext(), "position :" +new_id , 2000).show();
String table_name = "contacts";
String where = "task_name='"+task+ "&date_time="+date_time1+"'";
String[] whereArgs = null;
database.delete(table_name, where, whereArgs);
//over
c.close();
database.close();
Toast.makeText(getApplicationContext(), "Task Deleted Successfully", 1500).show();
update_page.this.startActivity(new Intent(update_page.this, update_page.class).addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));
break;
}
return super.onContextItemSelected(item);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo)
{
menu.add(0,1,0,"Update Task");
menu.add(0,2,0,"Delete");
super.onCreateContextMenu(menu, v, menuInfo);
}
}