需要后台运行进程
问题描述:
其实我已经写了一个使用web服务来更新服务器数据库的方法,从我的应用程序安装在使用两个IP地址的设备中。如果一个IP失败,那么它使用第二个IP来在服务器上提取数据。 如果两个IP地址都失败了,我将数据保存到我的一个sqllite数据库表tblTransaction中。下面给出了代码。需要后台运行进程
private void Delay15Minute() throws IOException {
String server1IPAddress = "";
String server2IPAddress = "";
String deviceId = "";
Cursor cursorAdmin;
Cursor cursorTransaction;
adminhelper = new admin_helper(this);
cursorAdmin = adminhelper.GetAdminDetails();
if (cursorAdmin.moveToFirst())
server1IPAddress = cursorAdmin.getString(cursorAdmin
.getColumnIndex("RemoteServer1IPAddress"));
server2IPAddress = cursorAdmin.getString(cursorAdmin
.getColumnIndex("RemoteServer2IPAddress"));
deviceId = cursorAdmin.getString(cursorAdmin
.getColumnIndex("DeviceID"));
cursorAdmin.close();
ContentValues initialDelay15 = new ContentValues();
ContentValues initialTransaction = new ContentValues();
Date date = new Date();
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy");
String RevisedEstimatedDate = sdf.format(date);
manifest_helper = new manifest_helper(this);
cursor = manifest_helper.GetDeliveries(pkManifest);
cursor.moveToFirst();
dbAdapter = new DatabaseAdapter(this);
dbAdapter.open();
for (int i = 0; i < cursor.getCount(); i++) {
cursor.getString(cursor.getColumnIndex("PKDelivery"));
String RevisedTime=cursor.getString(cursor.getColumnIndex("RevisedEstimatedDeliveryTime"));
// get hour and minute from time string
StringTokenizer st1 = new StringTokenizer(RevisedTime, ":");
int j = 0;
int[] val = new int[st1.countTokens()];
// iterate through tokens
while (st1.hasMoreTokens()) {
val[j] = Integer.parseInt(st1.nextToken());
j++;
}
// call time add method with current hour, minute and minutesToAdd,
// return added time as a string
String dateRevisedEstimatedDeliveryTime = addTime(val[0], val[1], 15);
initialDelay15.put("RevisedEstimatedDeliveryTime",
dateRevisedEstimatedDeliveryTime);
dbAdapter.UpdateRecord("tblDelivery", initialDelay15, "PKDelivery"
+ "=" + cursor.getString(cursor.getColumnIndex("PKDelivery")), null);
}
dbAdapter.close();
dataXmlExporter=new DataXmlExporter(this);
dataXmlExporter.StartDataSet();
cursor = manifest_helper.GetDeliveries(pkManifest);
dataXmlExporter.AddRowandColumns(cursor,"tblDelivery");
String sqlTransaction = "Select 6 as TransactionType,'Update Revised Estimated Delivery Time' as Description,"
+ " deviceId as DeviceID ,date() as TransactionUploadDate,time() as TransactionUploadTime from tblAdmin where PKAdmin > ?";
dbAdapter = new DatabaseAdapter(this);
dbAdapter.open();
cursorTransaction = dbAdapter.ExecuteRawQuery(sqlTransaction, "-1");
dataXmlExporter.AddRowandColumns(cursorTransaction, "Transaction");
String XMLTransactionData=dataXmlExporter.EndDataSet();
try {
if ((server1IPAddress != "") && (server2IPAddress != "")) {
try {
if (server1IPAddress != "") {
InsertUploadedTrancasctionDetails(server1IPAddress,
deviceId, XMLTransactionData);
}
} catch (Exception exception) {
if ((server1IPAddress != server2IPAddress)
&& (server2IPAddress != "")) {
InsertUploadedTrancasctionDetails(server2IPAddress,
deviceId, XMLTransactionData);
}
}
}
} catch (Exception exception) {
initialTransaction.put("ReceivedDate",
RevisedEstimatedDate);
initialTransaction.put("TransactionData",
XMLTransactionData);
dbAdapter.InsertRecord("tblTransaction", "",
initialTransaction);
}
dbAdapter.close();
LoadDeliveries(pkManifest);
}
的问题是,我需要更新的数据存储在tbltransaction服务器自动当我们与我跑步相处连接到服务器IP application.I认为这是可能通过建立底色运行方式与我的应用程序一起检查tbltransaction中是否存在数据,并与服务器建立连接。
所以将任何一个有这种想法......如果是这样,请帮助meee ...........
答
这里有一对夫妇一起将做到这此方法。这些都在一个服务中,您可以使用一个处理程序,并在一个活动中执行此操作,但服务是一个明智的选择。
首先,我们需要能够告诉我们是否在线,这需要网络状态和Wifi国家权限:
public boolean isOnline() {
try {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo().isConnectedOrConnecting();
} catch (Exception e) {
return false;
}
}
接下来,我们需要能够设置闹钟重试。添加这些变量:
private static AlarmManager am;
private static PendingIntent pIntent;
public static final int MSG_UPDATE = 0;
public static final String PENDING_REQ_KEY = "request";
而设定的报警方法:
private synchronized void setAlarm() {
if (am == null) am = (AlarmManager)getSystemService(Context.ALARM_SERVICE);
if (Constants.LOG_DEBUG) Log.d(TAG,"Setting Alarm for 5 mins");
long delay = 300000L; //5 Mins
Intent i = new Intent(this,Service.class); //Reference the Service this method is in
i.putExtra(PENDING_REQ_KEY, MSG_UPDATE);
pIntent = PendingIntent.getService(this, 0, i, PendingIntent.FLAG_UPDATE_CURRENT);
am.set(AlarmManager.RTC,System.currentTimeMillis()+delay,pIntent);
}
接下来,重写onStartCommand方法,攻克了更新的要求:
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
if (intent.getExtras() != null && intent.getExtras().containsKey(PENDING_REQ_KEY)) {
int request = intent.getExtras().getInt(PENDING_REQ_KEY);
if (request == MSG_UPDATE) update();
}
return START_STICKY;
}
最后,您更新方法:
public void update() {
if (isOnline()) {
/** Push data to server here */
}
else {
setAlarm();
}
}
谢谢你的支持反馈...实施后,我会回到你身边...... –