Adding Notifications, Reading Notifications, Getting number of notifications in Android M.

By | February 20, 2016

This demo will show how to

1. Create and add a new Notification,
2. How many notifications are active in the current Application?
3. Delegate method for Notification Deletion.

Infolinks

For Adding a Notification we can use the following snippet.

[java]

// Create a Notification and notify the system.
final Notification.Builder builder = new Notification.Builder(getActivity())
.setSmallIcon(R.mipmap.ic_notification)
.setContentTitle(getString(R.string.app_name))
.setContentText(getString(R.string.sample_notification_content))
.setAutoCancel(true)
.setDeleteIntent(mDeletePendingIntent);

final Notification notification = builder.build();
mNotificationManager.notify(++mNotificationId, notification);

[/java]

For reading the number of currently Active notifications we can use

[java]

// Query the currently displayed notifications.
final StatusBarNotification[] activeNotifications = mNotificationManager
.getActiveNotifications();
final int numberOfNotifications = activeNotifications.length;
mNumberOfNotifications.setText(getString(R.string.active_notifications,
numberOfNotifications));

[/java]

To know when a Notification is deleted.

[java]

// Create a PendingIntent to be fired upon deletion of a Notification.
Intent deleteIntent = new Intent(ActiveNotificationActivity.ACTION_NOTIFICATION_DELETE);
mDeletePendingIntent = PendingIntent.getBroadcast(getActivity(),
2323 /* requestCode */, deleteIntent, 0);

[/java]

Infolinks

ActiveNotificationActivity.java (Activity when notification is clicked).

[java]

package com.example.android.activenotifications;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.PersistableBundle;

public class ActiveNotificationActivity extends MainActivity {

private ActiveNotificationFragment mFragment;

protected static final String ACTION_NOTIFICATION_DELETE
= "com.example.android.activenotifications.delete";

private BroadcastReceiver mDeleteReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (mFragment == null) {
findFragment();
}
mFragment.updateNumberOfNotifications();
}
};

@Override
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
findFragment();
mFragment.updateNumberOfNotifications();
}

private void findFragment() {
mFragment = (ActiveNotificationFragment) getSupportFragmentManager()
.findFragmentById(R.id.sample_content_fragment);
}

@Override
protected void onResume() {
super.onResume();
registerReceiver(mDeleteReceiver, new IntentFilter(ACTION_NOTIFICATION_DELETE));
}

@Override
protected void onPause() {
super.onPause();
unregisterReceiver(mDeleteReceiver);
}
}

[/java]


You can download the complete source Code from here.

Infolinks

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