what is alarm manager android
To access the system alarm in Android, the Android AlarmManager is used. It is used to schedule an application to run at a specific time in the future, that works whether the phone is running or not. To guarantee not to sleep the phone until the broadcast is handled, a CPU wake lock is held by the Android AlarmManager.
Android AlarmManager Example:
In the below example, we are demonstrating the usage of the AlarmManager to run the alarm after a specific time provided by the user.
activity_main.xml:
In the activity_main.xml file, we will drag an EditText and a button.
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Activity class:(File: MainActivity.java)
In the MainActivity.java file, we will write the code to start the alarm service when the user clicks on the button.
package com.example.radioapp;
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:: " + i + " seconds", Toast.LENGTH_LONG).show();
}
} |
BroadcastReceiver class:(File: MyBroadcastReceiver.java)
In the MyBroadcastReceiver class, we will write the code to start the alarm.:
package com.example.radioapp;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.Toast;
class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
MediaPlayer mp=MediaPlayer.create(context, R.raw.alarm);
mp.start();
Toast.makeText(context, "Alarm....", Toast.LENGTH_LONG).show();
}
}
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package com.example.radioapp;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.widget.Toast;
class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
MediaPlayer mp=MediaPlayer.create(context, R.raw.alarm);
mp.start();
Toast.makeText(context, "Alarm....", Toast.LENGTH_LONG).show();
}
} |
Manifest file:(File: AndroidManifest.xml)
In the AndroidManifest.xml file, we will provide a receiver entry.
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