Adapter.notifyDataSetChanged（）不工作 [英] Adapter.notifyDataSetChanged() is not working
问题描述
有一个antivity延伸活动，还有这次活动列表视图来显示，从SQLite数据库查询数据。当我longclick ListView的项目之一，一alertdialog会显示出来，以确保我真的要删除它。
但是，当我删除其中的数据，然后我再从数据库中查询数据，并使用 notifyDataSetChanged（）来makethe列表视图刷新，但它不能正常工作。
有没有在一些的onCreate code（）
There is an antivity extends Activity, there is a listview in this activity to show the data that query from SQlite database. When I longclick one of the listview's items and a alertdialog will show up to make sure that I really want to delete it.
But when I delete one of the data,then I query the data again from database and use notifyDataSetChanged() to makethe listview refresh, but it is not work.
There's some code in onCreate()
serviceListView.setOnItemLongClickListener(new OnItemLongClickListener()
{
@Override
public boolean onItemLongClick(AdapterView<?> arg0, View arg1,final int arg2, long arg3)
{
Map<String, String> map = new HashMap<String, String>();
if (data!=null)
{
String[] options = new String[]{ "edit", "delete" };
map = data.get(arg2);
final String companyname= map.get("companyname");
final String serviceaddress = map.get("serveraddress");
final String id = map.get("id");
new AlertDialog.Builder(ServiceListActivity.this)
.setTitle("options")
.setIcon(android.R.drawable.ic_dialog_info)
.setSingleChoiceItems(options,-1,
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog,int which)
{
if (which == 0)
{
dialog.dismiss();
Toast.makeText(ServiceListActivity.this, id+companyname+serviceaddress+"edit", Toast.LENGTH_SHORT).show();
}
else
{
dialog.dismiss();
AlertDialog.Builder builder = new Builder(ServiceListActivity.this);
builder.setMessage("delete?");
builder.setTitle("Notice");
builder.setPositiveButton("yes", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
Log.i("ServiceListActivity data1 = ", data.size()+"");
dialog.dismiss();
Message message = Message.obtain();
message.what = 1;
message.obj = id;
messageHandler.sendMessage(message);
}
});
builder.setNegativeButton("no", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which)
{
// TODO Auto-generated method stub
dialog.dismiss();
}
});
builder.create().show();
}
}
}).setNegativeButton("no", new DialogInterface.OnClickListener()
{
@Override
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
dialog.dismiss();
}
})
.show();
有一个innter类：
There is a innter class:
class MessageHandler extends Handler
{
public MessageHandler(Looper looper)
{
super(looper);
}
@Override
public void handleMessage(Message msg)
{
switch (msg.what)
{
case 1:
String id = msg.obj.toString();
int i = DatabaseTools.DeleteServer(database, Integer.parseInt(id));
if (i==1)
{
data = DatabaseTools.queryDataFromDatabase(database,cursor);
Log.i("ServiceListActivity data2 = ", data.size()+"");
myListAdapter.notifyDataSetChanged();
Toast.makeText(ServiceListActivity.this, "finished", Toast.LENGTH_SHORT).show();
}
break;
}
}
我不能修复这个问题，所以有人请帮助我，非常感谢你。
I cant fix this, so somebody help me please, thank you very much.
推荐答案
尝试调用这种方式：
runOnUiThread(new Runnable() {
public void run() {
myListAdapter.notifyDataSetChanged();
}
});
更新：
某处声明这Runnable的出你的处理器的。
Declare this Runnable somewhere out of your Handler.
Runnable run = new Runnable(){
public void run(){
myListAdapter.notifyDataSetChanged();
}
};
然后再从处理程序调用此。
then call this from your Handler.
yourActivity.runOnUiThread(run);
我觉得你是从处理程序调用是创造问题。
I think you are calling from Handler is creating problem.
希望这能解决你的问题。
Hope this will solved your problem.
感谢。
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