Chiama notifyDataSetChanged() sull'adattatore.
Alcune specifiche aggiuntive su come/quando chiamare notifyDataSetChanged() può essere visualizzato in questo video di Google I/O
.
Usa un Handler e il suo postDelayed metodo per invalidare l'adattatore dell'elenco come segue:
final Handler handler = new Handler()
handler.postDelayed( new Runnable() {
@Override
public void run() {
adapter.notifyDataSetChanged();
handler.postDelayed( this, 60 * 1000 );
}
}, 60 * 1000 );
Devi aggiornare l'interfaccia utente solo nel thread principale (UI).
Creando il gestore nel thread principale, ti assicuri che tutto ciò che pubblichi sul gestore venga eseguito anche nel thread principale.
try
{
validat_user(receivedName);
final Handler handler = new Handler();
handler.postDelayed( new Runnable() {
@Override
public void run() {
todoItems.clear();
//alertDialog.cancel();
validat_user(receivedName);
handler.postDelayed( this, 60 * 1000 );
}
}, 60 * 1000 );
}
catch(Exception e)
{
display("Network error.\nPlease check with your network settings.");
}
Primo validate user è la prima volta che carico i dati, dopo aver usato il gestore posso aggiornare i valori ogni minuto
il mio codice completo è sotto
package com.example.employeeinduction;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.TypedArray;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupMenu;
import android.widget.PopupMenu.OnMenuItemClickListener;
import android.widget.Toast;
public class pdf extends Activity
{
ImageView iv;
public boolean connect=false,logged=false;
public String db_select;
ListView l1;
AlertDialog alertDialog;
String mPwd,UName1="Success",UName,ret,receivedName;
public Iterator<String> itr;
//private String SERVICE_URL = "http://61.12.7.197:8080/pdf";
//private String SERVICE_URL1 = "http://61.12.7.197:8080/url";
//private final String SERVICE_URL = "http://10.54.3.208:8080/Employee/person/pdf";
//private final String SERVICE_URL1 = "http://10.54.3.208:8080/Employee/person/url";
private final String SERVICE_URL = Urlmanager.Address+"pdf";
private final String SERVICE_URL1 = Urlmanager.Address+"url";
private final String TAG = "Pdf";
ArrayList<String> todoItems;
Boolean isInternetPresent = false;
ConnectionDetector cd;
ArrayAdapter<String> aa;
public List<String> list1=new ArrayList<String>();
public DrawerLayout mDrawerLayout;
public ListView mDrawerList;
//public ActionBarDrawerToggle mDrawerToggle;
// NavigationDrawer title "Nasdaq" in this example
public CharSequence mDrawerTitle;
// App title "Navigation Drawer" in this example
public CharSequence mTitle;
// slider menu items details
public String[] navMenuTitles=null;
public TypedArray navMenuIcons;
public ArrayList<NavDrawerItem> navDrawerItems;
public NavDrawerListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.sliding_project);
iv = (ImageView)findViewById(R.id.imageView2);
l1 = (ListView)findViewById(R.id.list);
mTitle = mDrawerTitle = getTitle();
// getting items of slider from array
navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);
// getting Navigation drawer icons from res
navMenuIcons = getResources()
.obtainTypedArray(R.array.nav_drawer_icons);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.list_slidermenu);
navDrawerItems = new ArrayList<NavDrawerItem>();
// list item in slider at 1 Home Nasdaq details
navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
// list item in slider at 2 Facebook details
navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
// list item in slider at 3 Google details
navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
// list item in slider at 4 Apple details
// Recycle array
navMenuIcons.recycle();
mDrawerList.setOnItemClickListener(new SlideMenuClickListener());
// setting list adapter for Navigation Drawer
adapter = new NavDrawerListAdapter(getApplicationContext(),
navDrawerItems);
mDrawerList.setAdapter(adapter);
if (savedInstanceState == null) {
displayView(0);
}
iv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
PopupMenu popup = new PopupMenu(getBaseContext(), v);
/** Adding menu items to the popumenu */
popup.getMenuInflater().inflate(R.menu.main, popup.getMenu());
popup.setOnMenuItemClickListener(new OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()){
case R.id.Home:
Intent a = new Intent(pdf.this,Design_Activity.class);
startActivity(a);
//Projects_Accel.this.finish();
// return true;
break;
case R.id.Logout:
/*Intent z = new Intent(this,MainActivity.class);
z.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(z);
this.finish();*/
Intent z = new Intent(pdf.this,MainActivity.class);
z.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_CLEAR_TASK |
Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(z);
pdf.this.finish();
// return true;
break;
}
return true;
}
});
popup.show();
}
});
todoItems = new ArrayList<String>();
aa = new ArrayAdapter<String>(this,R.layout.list_row,R.id.title,todoItems);
l1.setAdapter(aa);
todoItems.clear();
Intent intent = getIntent();
receivedName = (String) intent.getSerializableExtra("PROJECT");
cd = new ConnectionDetector(getApplicationContext());
isInternetPresent = cd.isConnectingToInternet();
if(isInternetPresent)
{
try
{
validat_user(receivedName);
final Handler handler = new Handler();
handler.postDelayed( new Runnable() {
@Override
public void run() {
todoItems.clear();
//alertDialog.cancel();
validat_user(receivedName);
handler.postDelayed( this, 60 * 1000 );
}
}, 60 * 1000 );
}
catch(Exception e)
{
display("Network error.\nPlease check with your network settings.");
}
}
else
{
display("No Internet Connection..");
}
l1.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
String name=(String)parent.getItemAtPosition(position);
/*Toast.makeText(getBaseContext(), name, Toast.LENGTH_LONG).show();
Intent i = new Intent(getBaseContext(),Webview.class);
i.putExtra("USERNAME", name);
startActivity(i);*/
cd = new ConnectionDetector(getApplicationContext());
isInternetPresent = cd.isConnectingToInternet();
if(isInternetPresent)
{
try
{
validat_user1(receivedName,name);
}
catch(Exception e)
{
display("Network error.\nPlease check with your network settings.");
}
}
else
{
display("No Internet Connection..");
}
}
});
}
private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected item
displayView(position);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
//setMenuBackground();
return true;
}
/*@Override
public boolean onOptionsItemSelected(MenuItem item) {
// title/icon
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
// Handle action bar actions click
switch (item.getItemId()) {
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}*/
//called when invalidateOptionsMenu() invoke
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// if Navigation drawer is opened, hide the action items
//boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
//menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
return super.onPrepareOptionsMenu(menu);
}
private void displayView(int position) {
// update the main content with called Fragment
switch (position) {
case 1:
//fragment = new Fragment2Profile();
Intent i = new Intent(pdf.this,Design_Activity.class);
startActivity(i);
pdf.this.finish();
break;
case 2:
//fragment = new Fragment3Logout();
Intent z = new Intent(pdf.this,MainActivity.class);
z.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP |
Intent.FLAG_ACTIVITY_CLEAR_TASK |
Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(z);
pdf.this.finish();
break;
default:
break;
}
}
public void display(String msg)
{
Toast.makeText(pdf.this, msg, Toast.LENGTH_LONG).show();
}
private void validat_user(String st)
{
WebServiceTask wst = new WebServiceTask(WebServiceTask.POST_TASK, this, "");
wst.addNameValuePair1("TABLE_NAME", st);
// wst.addNameValuePair("Emp_PWD", stg2);
// db_select=stg1;
//display("I am");
wst.execute(new String[] { SERVICE_URL });
//display(SERVICE_URL);
}
private void validat_user1(String stg1,String stg2)
{
db_select=stg1;
WebServiceTask wst = new WebServiceTask(WebServiceTask.POST_TASK, this, "Loading...");
wst.addNameValuePair1("PDF_NAME", stg1);
wst.addNameValuePair1("TABLE_NAME1", stg2);
wst.execute(new String[] { SERVICE_URL1 });
}
@SuppressWarnings("deprecation")
public void no_net()
{
display( "No Network Connection");
final AlertDialog alertDialog = new AlertDialog.Builder(pdf.this).create();
alertDialog.setTitle("No Internet Connection");
alertDialog.setMessage("You don't have internet connection.\nElse please check the Internet Connection Settings.");
//alertDialog.setIcon(R.drawable.error_info);
alertDialog.setCancelable(false);
alertDialog.setButton("Close", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
alertDialog.cancel();
pdf.this.finish();
System.exit(0);
}
});
alertDialog.setButton2("Use Local DataBase", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int which)
{
display( "Accessing local DataBase.....");
alertDialog.cancel();
}
});
alertDialog.show();
}
private class WebServiceTask extends AsyncTask<String, Integer, String> {
public static final int POST_TASK = 1;
private static final String TAG = "WebServiceTask";
// connection timeout, in milliseconds (waiting to connect)
private static final int CONN_TIMEOUT = 12000;
// socket timeout, in milliseconds (waiting for data)
private static final int SOCKET_TIMEOUT = 12000;
private int taskType = POST_TASK;
private Context mContext = null;
private String processMessage = "Processing...";
private ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
private ProgressDialog pDlg = null;
public WebServiceTask(int taskType, Context mContext, String processMessage) {
this.taskType = taskType;
this.mContext = mContext;
this.processMessage = processMessage;
}
public void addNameValuePair1(String name, String value) {
params.add(new BasicNameValuePair(name, value));
}
@SuppressWarnings("deprecation")
private void showProgressDialog() {
pDlg = new ProgressDialog(mContext);
pDlg.setMessage(processMessage);
pDlg.setProgressDrawable(mContext.getWallpaper());
pDlg.setProgressStyle(ProgressDialog.STYLE_SPINNER);
pDlg.setCancelable(false);
pDlg.show();
}
@Override
protected void onPreExecute() {
showProgressDialog();
}
protected String doInBackground(String... urls) {
String url = urls[0];
String result = "";
HttpResponse response = doResponse(url);
if (response == null) {
return result;
} else {
try {
result = inputStreamToString(response.getEntity().getContent());
} catch (IllegalStateException e) {
Log.e(TAG, e.getLocalizedMessage(), e);
} catch (IOException e) {
Log.e(TAG, e.getLocalizedMessage(), e);
}
}
return result;
}
@Override
protected void onPostExecute(String response) {
handleResponse(response);
pDlg.dismiss();
}
// Establish connection and socket (data retrieval) timeouts
private HttpParams getHttpParams() {
HttpParams htpp = new BasicHttpParams();
HttpConnectionParams.setConnectionTimeout(htpp, CONN_TIMEOUT);
HttpConnectionParams.setSoTimeout(htpp, SOCKET_TIMEOUT);
return htpp;
}
private HttpResponse doResponse(String url) {
// Use our connection and data timeouts as parameters for our
// DefaultHttpClient
HttpClient httpclient = new DefaultHttpClient(getHttpParams());
HttpResponse response = null;
try {
switch (taskType) {
case POST_TASK:
HttpPost httppost = new HttpPost(url);
// Add parameters
httppost.setEntity(new UrlEncodedFormEntity(params));
response = httpclient.execute(httppost);
break;
}
} catch (Exception e) {
display("Remote DataBase can not be connected.\nPlease check network connection.");
Log.e(TAG, e.getLocalizedMessage(), e);
return null;
}
return response;
}
private String inputStreamToString(InputStream is) {
String line = "";
StringBuilder total = new StringBuilder();
// Wrap a BufferedReader around the InputStream
BufferedReader rd = new BufferedReader(new InputStreamReader(is));
try {
// Read response until the end
while ((line = rd.readLine()) != null) {
total.append(line);
}
} catch (IOException e) {
Log.e(TAG, e.getLocalizedMessage(), e);
}
// Return full string
return total.toString();
}
}
public void handleResponse(String response)
{ //display("JSON responce is : "+response);
if(!response.equals(""))
{
try {
JSONObject jso = new JSONObject(response);
int UName = jso.getInt("status1");
if(UName==1)
{
String status = jso.getString("reps1");
ret=status.substring(12,status.length()-2);
todoItems.add(0, ret);
aa.notifyDataSetChanged();
}
else if(UName==-1)
{
String status = jso.getString("status");
//ret=status.substring(12,status.length()-2);
//display(status);
Intent intObj=new Intent(pdf.this,Webview.class);
intObj.putExtra("USERNAME",status);
startActivity(intObj);
}
else if(UName>1)
{
// int count=Integer.parseInt(UName);
// display("Number of Projects have been handling in AFL right now: "+count);
list1=new ArrayList<String>();
JSONArray array=jso.getJSONArray("reps1");
for(int i=0;i<array.length();i++)
{
list1.add(array.getJSONObject(i).getString("pdfName"));
}Collections.sort(list1);
Collections.reverse(list1);
itr=list1.iterator();
while(itr.hasNext())
{
//str1=itr.next()+"\n";
todoItems.add(0, itr.next().toString());
aa.notifyDataSetChanged();
}
//tv1.setText(str1);
}
else
{
final Context context = this;
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
context);
// set title
alertDialogBuilder.setTitle("");
// set dialog message
alertDialogBuilder
.setMessage("Records unavailable for this project!")
.setCancelable(false)
.setPositiveButton("Exit",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
// if this button is clicked, close
// current activity
pdf.this.finish();
}
});
// create alert dialog
alertDialog = alertDialogBuilder.create();
// show it
alertDialog.show();
}
} catch (Exception e) {
Log.e(TAG, e.getLocalizedMessage(), e);
return;
}
}
else
{
display("unable to reach the server");
}
}
/**
* Slider menu item click listener
* */
/*private class SlideMenuClickListener implements
ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,
long id) {
// display view for selected item
displayView(position);
}
}
private void displayView(int position) {
// update the main content with called Fragment
// Fragment fragment = null;
switch (position) {
case 0:
// fragment = new Fragment1User();
break;
case 1:
// fragment = new Fragment2Profile();
break;
case 2:
// fragment = new Fragment3Logout();
break;
default:
break;
}
}*/
}
