Android AlarmManager

by Online Tutorials Library July 14, 2022

Android AlarmManager

Android AlarmManager allows you to access system alarm.

By the help of Android AlarmManager in android, you can schedule your application to run at a specific time in the future. It works whether your phone is running or not.

The Android AlarmManager holds a CPU wake lock that provides guarantee not to sleep the phone until broadcast is handled.

Android AlarmManager Example

Let’s see a simple AlarmManager example that runs after a specific time provided by user.

activity_main.xml

You need to drag only a edittext and a button as given below.

File: activity_main.xml

       <button android:id="@+id/button" android:layout_alignparentbottom="true" android:layout_centerhorizontal="true" android:layout_height="wrap_content" android:layout_marginbottom="103dp" android:layout_width="wrap_content" android:text="Start"></button>        

Activity class

The activity class starts the alarm service when user clicks on the button.

File: MainActivity.java

 package example.tutoraspire.com.alarmmanager;  import android.app.AlarmManager; import android.app.PendingIntent; import android.content.Intent; 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.Toast;  public class MainActivity extends AppCompatActivity {     Button start;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);         start= findViewById(R.id.button);          start.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View view) {                 startAlert();             }         });     }      public void startAlert(){         EditText text = findViewById(R.id.time);         int i = Integer.parseInt(text.getText().toString());         Intent intent = new Intent(this, MyBroadcastReceiver.class);         PendingIntent pendingIntent = PendingIntent.getBroadcast(                 this.getApplicationContext(), 234324243, intent, 0);         AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE);         alarmManager.set(AlarmManager.RTC_WAKEUP, System.currentTimeMillis()                 + (i * 1000), pendingIntent);         Toast.makeText(this, “Alarm set in ” + i + ” seconds”,Toast.LENGTH_LONG).show();     } } 

Let’s create BroadcastReceiver class that starts alarm.

File: MyBroadcastReceiver.java

 package example.tutoraspire.com.alarmmanager;  import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.media.MediaPlayer; import android.widget.Toast;  public class MyBroadcastReceiver extends BroadcastReceiver {     MediaPlayer mp;     @Override     public void onReceive(Context context, Intent intent) {         mp=MediaPlayer.create(context, R.raw.alarm);         mp.start();         Toast.makeText(context, “Alarm….”, Toast.LENGTH_LONG).show();     } } 

File: AndroidManifest.xml

You need to provide a receiver entry in AndroidManifest.xml file.

Let’s see the full code of AndroidManifest.xml file.

Output:

Next TopicAndroid Preferences Example

Android AlarmManager

Android AlarmManager

Android AlarmManager Example

activity_main.xml

Activity class

Output:

Android 11 | Android Version 11

AndroidManifest.xml file in android

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