我已经创建了 wifi 频道的 ListView 并且它工作正常，onResume() 调用更新列表的 AsyncTask，但更新后点击监听器停止工作，即使我尝试再次设置它。这是我的代码：
package co.uk.company.application.ui.wifi;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import co.uk.company.application.R;
import co.uk.company.application.injected.ApplicationGlobalState;
import co.uk.company.application.ui.companyActivity;
import co.uk.company.application.ui.dialog.YesNoAlertDialogCreator;
import co.uk.company.sources.telnet.WifiTelnetClass;
import com.google.inject.Inject;
import java.util.ArrayList;
import java.util.Vector;
import roboguice.inject.InjectView;
public class WifiAPsActivity extends companyActivity{
@Inject private ApplicationGlobalState applicationGlobalState;
@InjectView(R.id.wifi_networks_list) private ListView listView1;
private WifiChannels wifiChannels;
private WifiChannel channelSelected;
private ArrayList<WifiChannel> data;
private ArrayList<WifiChannel> dataold;
private Vector <WifiChannel> vect;
private WifiAPsAdapter adapter;
private RealtimeUpdateScreen realtimeUpdateScreen;
private AdapterView.OnItemClickListener listener;
@Override
public void onCreate(Bundle savedInstanceState){
Log.w("","onCreate(...) start");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wifi_networks);
listener= new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, final int arg2, long arg3) {
arg0.showContextMenuForChild(arg1);
//if(adapter.getItem(arg2).toString().endsWith(".txt"))
Toast.makeText(getApplicationContext(),getString(R.string.loading), Toast.LENGTH_LONG).show();
}
};
dataold= new ArrayList<WifiChannel>();
data =new ArrayList<WifiChannel>();
wifiChannels=applicationGlobalState.wifiCurrentChannels;
if (wifiChannels != null)
for(WifiChannel chn : wifiChannels.getChannels()){
dataold.add(chn);
data.add(chn);
}
wifiChannels=applicationGlobalState.wifiCurrentChannels5GHz;
if (wifiChannels != null)
for(WifiChannel chn : wifiChannels.getChannels()){
dataold.add(chn);
data.add(chn);
}
adapter = new WifiAPsAdapter(this,R.layout.wifi_networks_item_row, data);
listView1.setAdapter(adapter);
listView1.setItemsCanFocus(false);
registerForContextMenu(listView1);
listView1.setOnItemClickListener(listener);
Log.w("","onCreate(...) finish");
}
@Override
public void onResume(){
Log.w("","onResume() start");
super.onResume();
//realtimeUpdateScreen = new RealtimeUpdateScreen();
//realtimeUpdateScreen.execute(new Object());
Log.w("","onResume() finish");
}
@Override
public void onPause(){
super.onPause();
realtimeUpdateScreen.cancel(true);
realtimeUpdateScreen = null;
Log.w("","onPause() finish");
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo){
Log.w("","onCreateContextMenu");
AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;
// menu.setHeaderTitle(fileNames.get(info.position));
channelSelected = data.get(info.position);
menu.add(Menu.NONE, 0, 0, "Connect");
menu.add(Menu.NONE, 1, 1, "Disconnect");
menu.add(Menu.NONE, 2, 2, "Do nothing");
}
@Override
public boolean onContextItemSelected(MenuItem item) {
Log.w("","onContextItemSelected");
int menuItemIndex = item.getItemId();
//final AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
switch (menuItemIndex){
case 0:
final AlertDialog.Builder alert = new AlertDialog.Builder(this);
LayoutInflater li = LayoutInflater.from(this);
View promptsView = li.inflate(R.layout.dialog_with_text_fields, null);
alert.setView(promptsView);
final TextView SSIDfield = (TextView) promptsView.findViewById(R.id.ssid_field);
final EditText input2 = (EditText) promptsView.findViewById(R.id.password_field);
SSIDfield.setText(channelSelected.getName());
// final Button okButton = (Button) promptsView.findViewById(R.id.wifi_button_yes);
// final Button cancelButton =(Button)promptsView.findViewById(R.id.wifi_button_no);
// okButton.setOnClickListener(new View.OnClickListener() {
// @Override
// public void onClick(View arg0) {
//
// }
// });
//
// cancelButton.setOnClickListener(new View.OnClickListener() {
// @Override
// public void onClick(View arg0) {
// // alert.
// }
// });
alert.setPositiveButton("OKK",
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int id) {
String SSID = channelSelected.getName();
String PASSWORD = input2.getText().toString().trim();
if(WifiTelnetClass.getInstance().connect(SSID, PASSWORD))
Toast.makeText(getApplicationContext(), SSID+" Connected", Toast.LENGTH_SHORT).show();
else Toast.makeText(getApplicationContext(), "Not Connected!", Toast.LENGTH_SHORT).show();
}
});
alert.setNegativeButton("CCancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
dialog.cancel();
}
});
alert.show();
break;
case 1:
YesNoAlertDialogCreator.create(this, "Are You Sure?",
getString(R.string.sure_delete_result), new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int whichButton) {
Toast.makeText(getApplicationContext(),"Disconnecting!!", Toast.LENGTH_LONG).show();
if(WifiTelnetClass.getInstance().disconnect())
Toast.makeText(getApplicationContext(), " Disconnected", Toast.LENGTH_SHORT).show();
else Toast.makeText(getApplicationContext(), "Not Disconnected!", Toast.LENGTH_SHORT).show();
}
}).show();
Toast.makeText(getApplicationContext(),"Nothing!!!", Toast.LENGTH_LONG).show();
break;
case 2:
YesNoAlertDialogCreator.create(this, "Password please!!!",
getString(R.string.sure_delete_result), new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int whichButton) {
}
}).show();
Toast.makeText(getApplicationContext(),"It!", Toast.LENGTH_LONG).show();
break;
}
return true;
}
class RealtimeUpdateScreen extends AsyncTask{
@Override
protected void onPreExecute(){
try{
Thread.sleep(50L);
}catch(Exception e){}
}
@Override
protected Object doInBackground(Object... arg0){
while(!isCancelled()){
try{
if(wifiChannels!=applicationGlobalState.wifiCurrentChannels)
publishProgress(arg0);
try{Thread.sleep(50);}catch(Exception e){}
}catch(Exception e){Log.e("","",e);}
}
return null;
}
protected void onProgressUpdate(Object...objects ){
try{
for(WifiChannel chn_ : dataold){
adapter.remove(chn_);
}
}catch(Exception e){Log.e("","",e);}
try{
dataold = new ArrayList<WifiChannel>();
//adapter.notifyDataSetChanged();
vect=applicationGlobalState.wifiCurrentChannels5GHz.getChannels();
for(WifiChannel chn : vect){
dataold.add(chn);
adapter.add(chn);
}
vect=applicationGlobalState.wifiCurrentChannels.getChannels();
for(WifiChannel chn : vect){
dataold.add(chn);
adapter.add(chn);
}
adapter.notifyDataSetChanged();
}catch(Exception e){Log.e("","",e);}
}
}
}
会是什么？谢谢你！