我必须在android应用程序中为一个项目调用多个服务。在每个服务中，我必须调用单独的Web服务并获取一些数据并使用本地sqlite数据库进行处理。我可以单独调用每个服务，并可以使用本地数据库操作其结果。但是无法按顺序调用所有服务。我的代码如下：
@Override
public void onStart(Intent intent, int startid) {
Toast.makeText(this, "My Service Started", Toast.LENGTH_LONG).show();
Timer timer = new Timer();
final SyncTableUsers syncUserObj = new SyncTableUsers(LocalService.this);
final SyncTableVehicles syncVehicleObj = new SyncTableVehicles(this);
final SyncTableLicenses syncLicenseObj = new SyncTableLicenses(this);
final SyncTableTags syncTagObj = new SyncTableTags(this);
final SyncTableTagMappings syncTagMapObj = new SyncTableTagMappings(this);
final SyncTableAddresses syncAddressObj = new SyncTableAddresses(this);
final SyncTableDispatches syncDispatchObj = new SyncTableDispatches(this);
final SyncEditCompany syncCompanyObj = new SyncEditCompany(LocalService.this);
final SyncEditVehicle syncEditVehicleObj = new SyncEditVehicle(LocalService.this);
final SyncEditUser syncEditUserObj = new SyncEditUser(this);
final SyncVehicleLog vLogObj = new SyncVehicleLog(LocalService.this);
TimerTask timerTask = new TimerTask() {
@Override
public void run() {
syncUserObj.syncUserData();
syncVehicleObj.syncVehicleData();
syncLicenseObj.syncLicensesData();
syncTagObj.syncTagData();
syncTagMapObj.syncTagMappingData();
syncAddressObj.syncAddressData();
syncDispatchObj.syncDispatchData();
syncCompanyObj.syncCompanyData();
syncEditVehicleObj.syncVehicleData();
syncEditUserObj.syncUserData();
Log.i("TAG", "LogId After insert values ");
}
}
};
timer.scheduleAtFixedRate(timerTask, 10000, 180000); call after every
3 minute
super.onStart(intent, startid);
syncUserData是一种调用Web服务的方法。
我建议你去AsyncTask解决方案。这是一种简单直接的运行请求或任何其他后台任务的方法，并使用具有最新OS virsion的设备调用Web服务，您必须使用AsyncTask。
它也很容易实现，例如onProgressUpdate如果您需要在运行请求时显示某种进度条。
private class YourTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
//call your methods from here
//publish yor progress here..
publishProgress((int) ((i / (float) count) * 100));
}
protected void onProgressUpdate(Integer... progress) {
setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
//action after execution success or not
}
}
使用Intent Service按顺序执行任务。有关详细信息，请查看以下链接 https://developer.android.com/reference/android/app/IntentService.html
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import static android.content.Context.ALARM_SERVICE;
import static android.content.Context.NOTIFICATION_SERVICE;
public class AlarmReceiver extends BroadcastReceiver {
public static String lat;
public static String lng;
public static String str_Address;
public static String issync = String.valueOf(0);
public static String timestamp;
public static String str_ATTEND_USERID;
public Context context;
public Locationdata locationdata;
public ArrayList<Locationdata> arrayList;
public Utils utils;
private String str_Url;
@Override
public void onReceive(final Context context, Intent intent) {
this.context = context;
lat = Utils.ReadSharePrefrence(context, Constants.KEY_LAT);
lng = Utils.ReadSharePrefrence(context, Constants.KEY_LONG);
arrayList = new ArrayList<>();
utils = new Utils(context);
addNotification(context);
nextAlarm(context);
getCurrentTimeDate();
str_ATTEND_USERID = Utils.ReadSharePrefrence(context, Constants.ATTEND_USER_ID);
new getAddressGeo().execute();
}
private void addNotification(Context context) {
NotificationCompat.Builder builder =
new NotificationCompat.Builder(context)
// .setSmallIcon(R.mipmap.ic_hrms_admin_logo)
.setContentTitle("HRMS")
.setContentText("Wake Up! Wake Up!");
Intent notificationIntent = new Intent(context, UsersTackingActivity.class);
PendingIntent contentIntent = PendingIntent.getActivity(context, 0, notificationIntent,
PendingIntent.FLAG_UPDATE_CURRENT);
builder.setContentIntent(contentIntent);
NotificationManager manager = (NotificationManager) context.getSystemService(NOTIFICATION_SERVICE);
manager.notify(0, builder.build());
}
private void nextAlarm(Context context)
{
Log.d("startTimer", " =============== Method called ================");
AlarmManager alarmMgr0 = (AlarmManager) context.getSystemService(ALARM_SERVICE);
Intent intent0 = new Intent(context, AlarmReceiver.class);
//Making pending intet which is called by alarm
PendingIntent sender = PendingIntent.getBroadcast(context, 1002, intent0, 0);
intent0 = new Intent(context, UsersTackingActivity.class);
//Seting local calender
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY));
calendar.set(Calendar.MINUTE, calendar.get(Calendar.MINUTE)+1);
calendar.set(Calendar.SECOND, 0);
alarmMgr0.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
}
**Activity**
private void startTimer()
{
startService(intent);
AlarmManager alarmMgr0 = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
Intent intent0 = new Intent(this, AlarmReceiver.class);
//Making pending intet which is called by alarm
PendingIntent sender = PendingIntent.getBroadcast(context, 1001, intent0, 0);
intent0 = new Intent(this, UsersTackingActivity.class);
//Seting local calender
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY));
calendar.set(Calendar.MINUTE, calendar.get(Calendar.MINUTE) + 1);
calendar.set(Calendar.SECOND, 0);
alarmMgr0.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);
}
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<receiver android:name=".GPSLocation.AlarmReceiver" />
public static String comaString(){
String result = "";
if (Constant.selectedMember.size()!=0){
for (int i=0 ; i<Constant.selectedMember.size() ; i++){
if (i==0){
result = Constant.selectedMember.get(i).getId();
} else {
result = result + "," +Constant.selectedMember.get(i).getId();
}
}
} else {
result = "";
}
return result;
}
final Snackbar snackbar = Snackbar
.make(llMain, "No internet connection", Snackbar.LENGTH_LONG)
.setAction("Retry", new View.OnClickListener() {
@Override
public void onClick(View view) {
Login();
}
});
snackbar.setActionTextColor(Color.RED);
snackbar.show();
private boolean appInstalledOrNot(String packageName) {
PackageManager pm = context.getPackageManager();
boolean app_installed;
try {
pm.getPackageInfo(packageName, PackageManager.GET_ACTIVITIES);
app_installed = true;
} catch (PackageManager.NameNotFoundException e) {
app_installed = false;
}
return app_installed;
}
public boolean isConnectingToInternet() {
ConnectivityManager connectivityManager = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Network[] networks = connectivityManager.getAllNetworks();
NetworkInfo networkInfo;
for (Network mNetwork : networks) {
networkInfo = connectivityManager.getNetworkInfo(mNetwork);
if (networkInfo.getState().equals(NetworkInfo.State.CONNECTED)) {
return true;
}
}
} else {
if (connectivityManager != null) {
//noinspection deprecation
NetworkInfo[] info = connectivityManager.getAllNetworkInfo();
if (info != null) {
for (NetworkInfo anInfo : info) {
if (anInfo.getState() == NetworkInfo.State.CONNECTED) {
Log.d("Network",
"NETWORKNAME: " + anInfo.getTypeName());
return true;
}
}
}
}
}
return false;
}
private void sendNotification(String messageBody) {
Bitmap bmp = getBitmapFromURL(image);
Intent intent = new Intent(this, Test.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(bmp)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}
public Bitmap getBitmapFromURL(String strURL) {
try {
URL url = new URL(strURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}