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Я пытаюсь запустить countdowntimer в фоновом режиме, чтобы сделать некоторые вычисления с помощью AsyncTask, но я получаю эту ошибкупроизошла ошибка при выполнении doInBackground() во время бега Countdowntimer
Это мой код
public class CurrentStatus extends AsyncTask<Context,Void,Context> {
float BatteryStatus;
int TimeStatus,HoursToCharge;
String USID, BatteryID, NetworkID, NetworkStatus, roamingLevel,
TimeID,ETTC,DischargeRate;
int dischargeRate;
Context newContext;
SharedPreferences sharedPreferences;
public float getBatteryLevel(Context context)
{
Intent batteryIntent = context.registerReceiver(null, new
IntentFilter(Intent.ACTION_BATTERY_CHANGED));
int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);
return ((float) level/(float) scale) * 100.0f;
}
public void getDischargeRate(final Context context)
{
final int currentBattery=(int)getBatteryLevel(context);
int q=0;
sharedPreferences=context.getSharedPreferences
("MyDischargePref" ,Context.MODE_PRIVATE);
final SharedPreferences.Editor editor1=sharedPreferences.edit();
new CountDownTimer(120000,600)
{
int BatteryDischargeRate;
public void onTick(long millisUntilFinished)
{
System.out.println(" seconds"+currentBattery);
}
int afterUsage;
public void onFinish()
{
afterUsage = (int)getBatteryLevel(context);
System.out.println("On Finish: "+ afterUsage);
BatteryDischargeRate=currentBattery-afterUsage;
System.out.println("Entering preference. BYE!
"+BatteryDischargeRate);
editor1.putString("DischargeRate",Integer.toString(BatteryDischargeRate));
}
}.start();
}
public String getNetworkInterface(Context context) {
WifiManager wifi = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
if (wifi.isWifiEnabled())
return "On";
else
return "Off";
}
public String getRoaming(Context context) {
boolean x = false;
TelephonyManager telephoneManager;
telephoneManager = (TelephonyManager)
context.getSystemService(Context.TELEPHONY_SERVICE);
x = telephoneManager.isNetworkRoaming();
if (x)
return "On";
else
return "Off";
}
public String getDataConnectionType(Context context) {
TelephonyManager telephoneManager;
telephoneManager = (TelephonyManager)
context.getSystemService(Context.TELEPHONY_SERVICE);
int a = telephoneManager.getNetworkType();
switch (a) {
case TelephonyManager.NETWORK_TYPE_1xRTT:
case TelephonyManager.NETWORK_TYPE_CDMA:
case TelephonyManager.NETWORK_TYPE_GPRS:
case TelephonyManager.NETWORK_TYPE_IDEN:
case TelephonyManager.NETWORK_TYPE_EDGE:
String nw = "00";
return "2G";
case TelephonyManager.NETWORK_TYPE_UMTS:
case TelephonyManager.NETWORK_TYPE_EVDO_0:
case TelephonyManager.NETWORK_TYPE_EVDO_A:
case TelephonyManager.NETWORK_TYPE_HSDPA:
case TelephonyManager.NETWORK_TYPE_HSUPA:
case TelephonyManager.NETWORK_TYPE_HSPA:
case TelephonyManager.NETWORK_TYPE_EVDO_B:
case TelephonyManager.NETWORK_TYPE_EHRPD:
case TelephonyManager.NETWORK_TYPE_HSPAP:
nw = "01";
return "3G";
case TelephonyManager.NETWORK_TYPE_LTE:
nw = "11";
return "4G";
default:
return "Unknown";
}
}
public String getDataMode(Context context) {
ConnectivityManager cm = (ConnectivityManager)
context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
boolean x = activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
if (x) {
if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE)
return "On";
else
return "Off";
} else
return "No Active Network";
}
public void retrieveStatus(Context context) {
Context retrieveContext=context;
SharedPreferences sharedPreferences=retrieveContext.getSharedPreferences("MyPref", Context.MODE_PRIVATE);
BatteryStatus = getBatteryLevel(retrieveContext);
if (BatteryStatus > 5 && BatteryStatus < 25) {
BatteryID = "11";
}
if (BatteryStatus > 25 && BatteryStatus < 50) {
BatteryID = "10";
}
if (BatteryStatus > 50 && BatteryStatus < 75) {
BatteryID = "01";
}
if (BatteryStatus > 75 && BatteryStatus < 100) {
BatteryID = "00";
}
NetworkID = getNetworkInterface(retrieveContext);
if (NetworkID == "ON") {
NetworkID = getDataConnectionType(retrieveContext);
if (NetworkStatus == "3G") {
NetworkStatus = "11";
}
if (NetworkStatus == "2G") {
NetworkStatus = "10";
}
} else {
NetworkStatus = "00";
}
NetworkID = getNetworkInterface(retrieveContext);
if (NetworkID == "On") {
NetworkStatus = "01";
}
roamingLevel = getRoaming(retrieveContext);
if (roamingLevel.equals("On")) {
roamingLevel = "1";
} else {
roamingLevel = "0";
}
ETTC=(sharedPreferences.getString("ETTC",""));
HoursToCharge=Integer.parseInt(ETTC);
if (HoursToCharge > 12) {
TimeID = "11";
}
if (HoursToCharge > 6 && HoursToCharge < 12) {
TimeID = "10";
}
if (HoursToCharge > 3 && HoursToCharge < 6) {
TimeID = "01";
}
if (HoursToCharge > 0 && HoursToCharge < 3) {
TimeID = "00";
}
DischargeRate=(sharedPreferences.getString("MyDischargePref",""));
System.out.println("Battery id:"+BatteryID);
System.out.println("ETTC:"+TimeID);
System.out.println("Network Status:"+NetworkStatus);
System.out.println("DischargeRate"+DischargeRate);
System.out.println("Roaming"+roamingLevel);
}
@Override
protected Context doInBackground(Context... params) {
Context backgroundcontext;
backgroundcontext=params[0];
getDischargeRate(backgroundcontext);
return backgroundcontext;
}
@Override
protected void onPostExecute(Context context) {
retrieveStatus(context);
}
}
и это LogCat
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #1
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: Process: com.first.shash_000.anantha, PID: 30111
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: java.lang.RuntimeException: An error occured while executing doInBackground()
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.AsyncTask$3.done(AsyncTask.java:304)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.Handler.<init>(Handler.java:200)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.Handler.<init>(Handler.java:114)
04-30 02:32:21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.CountDownTimer$1.<init>(CountDownTimer.java:114)
04-30 02: 32: 21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.CountDownTimer. (CountDownTimer.java:114) 04-30 02: 32: 21.697 30111 -30974/com.first.shash_000.anantha E/AndroidRuntime: at com.first.shash_000.anantha.CurrentStatus $ 1. (CurrentStatus.java:55) 04-30 02: 32: 21.697 30111-30974/com.first. shash_000.anantha E/AndroidRuntime: at com.first.shash_000.anantha.CurrentStatus.getDischargeRate (CurrentStatus.java:54) 04-30 02: 32: 21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at com.first.shash_000.anantha.CurrentStatus.doInBackground (CurrentStatus.java:226) 04-30 02: 32: 21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at com.first.shash_000. anantha.CurrentStatus.doInBackground (CurrentStatus.java:26) 04-30 02: 32: 21.697 30111-30974/com.first.shash_000.anantha E/AndroidRuntime: at android.os.AsyncTask $ 2.call (AsyncTask.java:292)
Возможный дубликат [Async Task Ошибка при выполнении doInBackground()] (http : //stackoverflow.com/questions/8172338/async-task-an-error-occured-while-executing-doinbackground) Вам нужно вызвать 'Looper.prepare()' – ChrisStillwell