How to run CountDownTimer in a Service in Android?

Question

I want a service which runs a CountDownTimer and in every tick I want to show the countdown in a Activity and after some interval play a sound.

All the process are going fine in a single Activity but during incoming call the countdown not working that's why I want to do this using a Service.

Can anybody help me?

thanks in advance.

Update...

mCountDownTimer = new CountDownTimer(mTimerDuration, 1000) {             @Override             public void onTick(long millisUntilFinished) {                 if (mTimerDuration > 0) {                     mDurationCount += 1000;                     showCountDown(                             ActivityA.this,                             (mSimpleDateFormat.format(mTimerDuration                                     - mDurationCount)));                     if (mDurationCount == mTimerDuration) {                         if (mRepeatTime > 1) {                             startRepeatTimer();                         }                         finishTimer();                     }                 }             }              @Override             public void onFinish() {             }         }.start(); 

Answer 1

The easiest way is probably to create a broadcast receiver in your activity and have the service send broadcasts to the receiver. Here's a full listing for a service class with a simplified CountDownTimer.

package com.example.cdt;  import android.app.Service; import android.content.Intent; import android.os.CountDownTimer; import android.os.IBinder; import android.util.Log;  public class BroadcastService extends Service {      private final static String TAG = "BroadcastService";      public static final String COUNTDOWN_BR = "your_package_name.countdown_br";     Intent bi = new Intent(COUNTDOWN_BR);      CountDownTimer cdt = null;      @Override         public void onCreate() {                    super.onCreate();              Log.i(TAG, "Starting timer...");              cdt = new CountDownTimer(30000, 1000) {                 @Override                 public void onTick(long millisUntilFinished) {                      Log.i(TAG, "Countdown seconds remaining: " + millisUntilFinished / 1000);                     bi.putExtra("countdown", millisUntilFinished);                     sendBroadcast(bi);                 }                  @Override                 public void onFinish() {                     Log.i(TAG, "Timer finished");                 }             };              cdt.start();         }          @Override         public void onDestroy() {              cdt.cancel();             Log.i(TAG, "Timer cancelled");             super.onDestroy();         }          @Override         public int onStartCommand(Intent intent, int flags, int startId) {                    return super.onStartCommand(intent, flags, startId);         }          @Override         public IBinder onBind(Intent arg0) {                    return null;         } } 

And here are the relevant lines from a main activity:

@Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.main);      startService(new Intent(this, BroadcastService.class));     Log.i(TAG, "Started service"); }  private BroadcastReceiver br = new BroadcastReceiver() {     @Override     public void onReceive(Context context, Intent intent) {                     updateGUI(intent); // or whatever method used to update your GUI fields     } };  @Override   public void onResume() {     super.onResume();             registerReceiver(br, new IntentFilter(BroadcastService.COUNTDOWN_BR));     Log.i(TAG, "Registered broacast receiver");     }  @Override public void onPause() {     super.onPause();     unregisterReceiver(br);     Log.i(TAG, "Unregistered broacast receiver"); }  @Override public void onStop() {     try {         unregisterReceiver(br);     } catch (Exception e) {         // Receiver was probably already stopped in onPause()     }     super.onStop(); } @Override public void onDestroy() {             stopService(new Intent(this, BroadcastService.class));     Log.i(TAG, "Stopped service");     super.onDestroy(); }  private void updateGUI(Intent intent) {     if (intent.getExtras() != null) {         long millisUntilFinished = intent.getLongExtra("countdown", 0);         Log.i(TAG, "Countdown seconds remaining: " +  millisUntilFinished / 1000);                 } } 

You'll also need to define the service between the start/end application tags in your manifest file.

<service android:name=".BroadcastService" /> 

Answer 2

Download source code Android Countdown Timer Run In Background

activity_main.xml

<RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent" xmlns:android="http://schemas.android.com/apk/res/android">       <EditText         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:id="@+id/et_hours"         android:hint="Hours"         android:inputType="time"         android:layout_marginRight="5dp"         />  <Button     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:id="@+id/btn_timer"     android:layout_above="@+id/btn_cancel"     android:text="Start Timer"/>  <Button     android:layout_width="match_parent"     android:layout_height="wrap_content"     android:layout_alignParentBottom="true"     android:id="@+id/btn_cancel"     android:text="cancel timer"/>  <TextView     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:id="@+id/tv_timer"     android:layout_centerInParent="true"     android:textSize="25dp"     android:textColor="#000000"     android:text="00:00:00"/>  </RelativeLayout> 

Timer_Service.java

package com.countdowntimerservice;  import android.app.Service; import android.content.Intent; import android.content.SharedPreferences; import android.os.Handler; import android.os.IBinder; import android.preference.PreferenceManager; import android.support.annotation.Nullable; import android.util.Log; import java.text.SimpleDateFormat; import java.util.Calendar; import java.util.Date; import java.util.Timer; import java.util.TimerTask; import java.util.concurrent.TimeUnit;  public class Timer_Service extends Service {  public static String str_receiver = "com.countdowntimerservice.receiver";  private Handler mHandler = new Handler(); Calendar calendar; SimpleDateFormat simpleDateFormat; String strDate; Date date_current, date_diff; SharedPreferences mpref; SharedPreferences.Editor mEditor;  private Timer mTimer = null; public static final long NOTIFY_INTERVAL = 1000; Intent intent;  @Nullable @Override public IBinder onBind(Intent intent) {     return null; }  @Override public void onCreate() {     super.onCreate();      mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());     mEditor = mpref.edit();     calendar = Calendar.getInstance();     simpleDateFormat = new SimpleDateFormat("HH:mm:ss");      mTimer = new Timer();     mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);     intent = new Intent(str_receiver); }   class TimeDisplayTimerTask extends TimerTask {      @Override     public void run() {         mHandler.post(new Runnable() {              @Override             public void run() {                  calendar = Calendar.getInstance();                 simpleDateFormat = new SimpleDateFormat("HH:mm:ss");                 strDate = simpleDateFormat.format(calendar.getTime());                 Log.e("strDate", strDate);                 twoDatesBetweenTime();              }          });     }  }  public String twoDatesBetweenTime() {       try {         date_current = simpleDateFormat.parse(strDate);     } catch (Exception e) {      }      try {         date_diff = simpleDateFormat.parse(mpref.getString("data", ""));     } catch (Exception e) {      }      try {           long diff = date_current.getTime() - date_diff.getTime();         int int_hours = Integer.valueOf(mpref.getString("hours", ""));          long int_timer = TimeUnit.HOURS.toMillis(int_hours);         long long_hours = int_timer - diff;         long diffSeconds2 = long_hours / 1000 % 60;         long diffMinutes2 = long_hours / (60 * 1000) % 60;         long diffHours2 = long_hours / (60 * 60 * 1000) % 24;           if (long_hours > 0) {             String str_testing = diffHours2 + ":" + diffMinutes2 + ":" + diffSeconds2;              Log.e("TIME", str_testing);              fn_update(str_testing);         } else {             mEditor.putBoolean("finish", true).commit();             mTimer.cancel();         }     }catch (Exception e){         mTimer.cancel();         mTimer.purge();       }      return "";  }  @Override public void onDestroy() {     super.onDestroy();     Log.e("Service finish","Finish"); }  private void fn_update(String str_time){      intent.putExtra("time",str_time);     sendBroadcast(intent); } } 

MainActivity.java

package com.countdowntimerservice;  import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.preference.PreferenceManager; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import java.text.SimpleDateFormat; import java.util.Calendar;   public class MainActivity extends AppCompatActivity implements View.OnClickListener {  private Button btn_start, btn_cancel; private TextView tv_timer; String date_time; Calendar calendar; SimpleDateFormat simpleDateFormat; EditText et_hours;  SharedPreferences mpref; SharedPreferences.Editor mEditor;  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);     init();     listener();   }  private void init() {     btn_start = (Button) findViewById(R.id.btn_timer);     tv_timer = (TextView) findViewById(R.id.tv_timer);     et_hours = (EditText) findViewById(R.id.et_hours);     btn_cancel = (Button) findViewById(R.id.btn_cancel);        mpref = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());     mEditor = mpref.edit();      try {         String str_value = mpref.getString("data", "");         if (str_value.matches("")) {             et_hours.setEnabled(true);             btn_start.setEnabled(true);             tv_timer.setText("");          } else {              if (mpref.getBoolean("finish", false)) {                 et_hours.setEnabled(true);                 btn_start.setEnabled(true);                 tv_timer.setText("");             } else {                  et_hours.setEnabled(false);                 btn_start.setEnabled(false);                 tv_timer.setText(str_value);             }         }     } catch (Exception e) {      }    }  private void listener() {     btn_start.setOnClickListener(this);     btn_cancel.setOnClickListener(this);  }  @Override public void onClick(View v) {      switch (v.getId()) {         case R.id.btn_timer:               if (et_hours.getText().toString().length() > 0) {                  int int_hours = Integer.valueOf(et_hours.getText().toString());                  if (int_hours<=24) {                       et_hours.setEnabled(false);                     btn_start.setEnabled(false);                       calendar = Calendar.getInstance();                     simpleDateFormat = new SimpleDateFormat("HH:mm:ss");                     date_time = simpleDateFormat.format(calendar.getTime());                      mEditor.putString("data", date_time).commit();                     mEditor.putString("hours", et_hours.getText().toString()).commit();                       Intent intent_service = new Intent(getApplicationContext(), Timer_Service.class);                     startService(intent_service);                 }else {                     Toast.makeText(getApplicationContext(),"Please select the value below 24 hours",Toast.LENGTH_SHORT).show();                 } /*                 mTimer = new Timer();                 mTimer.scheduleAtFixedRate(new TimeDisplayTimerTask(), 5, NOTIFY_INTERVAL);*/             } else {                 Toast.makeText(getApplicationContext(), "Please select value", Toast.LENGTH_SHORT).show();             }             break;           case R.id.btn_cancel:            Intent intent = new Intent(getApplicationContext(),Timer_Service.class);          stopService(intent);              mEditor.clear().commit();              et_hours.setEnabled(true);             btn_start.setEnabled(true);             tv_timer.setText("");               break;      }  }  private BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {     @Override     public void onReceive(Context context, Intent intent) {         String str_time = intent.getStringExtra("time");         tv_timer.setText(str_time);      } };  @Override protected void onResume() {     super.onResume();     registerReceiver(broadcastReceiver,new IntentFilter(Timer_Service.str_receiver));  }  @Override protected void onPause() {     super.onPause();     unregisterReceiver(broadcastReceiver); } }