Created
March 25, 2020 16:59
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MAD Labsheet 4
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| package lk.sliit.mad.labsheet4; | |
| import androidx.appcompat.app.AppCompatActivity; | |
| import androidx.core.app.NotificationCompat; | |
| import androidx.core.app.NotificationManagerCompat; | |
| import android.app.NotificationChannel; | |
| import android.app.NotificationManager; | |
| import android.app.PendingIntent; | |
| import android.content.Intent; | |
| import android.os.Build; | |
| import android.os.Bundle; | |
| import android.view.View; | |
| import android.widget.Button; | |
| import android.widget.EditText; | |
| import org.w3c.dom.Text; | |
| public class MainActivity extends AppCompatActivity { | |
| /** | |
| * Channel ID to be used to send notifications | |
| */ | |
| private final String CHANNEL_ID = "111"; | |
| @Override | |
| protected void onCreate(Bundle savedInstanceState) { | |
| super.onCreate(savedInstanceState); | |
| setContentView(R.layout.activity_main); | |
| // create notification channel if API version is greater than 26 | |
| this.createNotificationChannel(); | |
| // Get signup button reference | |
| Button signUpButton = (Button) findViewById(R.id.btnSignUp); | |
| /** | |
| * Add listener to signup button to show a notification | |
| * on button click | |
| */ | |
| signUpButton.setOnClickListener(new View.OnClickListener() { | |
| @Override | |
| public void onClick(View v) { | |
| EditText txtName = findViewById(R.id.txtName); | |
| String name = txtName.getText().toString(); | |
| if (!name.isEmpty()) { | |
| showNotification(name); | |
| } else { | |
| txtName.setError("Please enter a name"); | |
| } | |
| } | |
| }); | |
| } | |
| /** | |
| * Function to create the notification channel | |
| * This is only for API version 26 and up | |
| * | |
| * A channel is through with the notifications are sent. | |
| * It's like a group or conversation on whatsapp where messages from | |
| * participants in it are sent through either that specific group or | |
| * conversation only | |
| */ | |
| private void createNotificationChannel() { | |
| // Check if API version is greater than 26 | |
| if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { | |
| // Define channel properties | |
| CharSequence name = getString(R.string.notifications_channel_name); | |
| String description = getString(R.string.notifications_channel_description); | |
| int importance = NotificationManager.IMPORTANCE_DEFAULT; | |
| // Create new notification channel object and set properties | |
| NotificationChannel channel = new NotificationChannel( | |
| CHANNEL_ID, | |
| name, | |
| importance | |
| ); | |
| channel.setDescription(description); | |
| // Register channel with the notification manager | |
| NotificationManager notificationManager = getSystemService(NotificationManager.class); | |
| notificationManager.createNotificationChannel(channel); | |
| } | |
| } | |
| /** | |
| * Function to show push notification when the button is clicked | |
| * This is called within the listener for the button | |
| * | |
| * @param name - The value entered by the user in the text input (EditText) | |
| */ | |
| private void showNotification(String name) { | |
| // Create intent to the registration form activity | |
| Intent registrationIntent = new Intent(this, Registration.class); | |
| /** | |
| * Check out this link for explanation on the following flags | |
| * https://stackoverflow.com/questions/21833402/difference-between-intent-flag-activity-clear-task-and-intent-flag-activity-task/29565717 | |
| */ | |
| registrationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK); | |
| /** | |
| * A pending intent specifies an action that will take place in the future. According to | |
| * this usecase, this intent will be fired only when the push notification is clicked | |
| */ | |
| PendingIntent pendingRegistrationIntent = PendingIntent.getActivity(this, 0, registrationIntent, 0); | |
| /** | |
| * Build the push notification | |
| * NOTE: you have to use the same channel id used above in the code | |
| */ | |
| NotificationCompat.Builder builder = | |
| new NotificationCompat.Builder(this, CHANNEL_ID) | |
| .setSmallIcon(R.drawable.ic_launcher_background) | |
| .setContentTitle("My notification") | |
| .setContentText("Hello ".concat(name).concat("!, welcome to the MAD team")) | |
| .setPriority(NotificationCompat.PRIORITY_DEFAULT) | |
| .setContentIntent(pendingRegistrationIntent) | |
| .setAutoCancel(true); | |
| /** | |
| * Send notification | |
| */ | |
| NotificationManagerCompat notificationManager = NotificationManagerCompat.from(this); | |
| notificationManager.notify(0, builder.build()); | |
| } | |
| } |
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