Android: Use the correct value for notification (#14209)

The notification channel creation is moved into MainActivity.
The notification channel ID string is stored into a static variable.
The name and description of the notification channel are stored into the strings resource file.

Co-authored-by: sfan5 <sfan5@live.de>

android/app/src/main/java/net/minetest/minetest/MainActivity.java

@@ -20,23 +20,29 @@ with this program; if not, write to the Free Software Foundation, Inc.,
 
 package net.minetest.minetest;
 
+import android.app.NotificationChannel;
+import android.app.NotificationManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentFilter;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.ProgressBar;
 import android.widget.TextView;
 import android.widget.Toast;
 
+import androidx.annotation.RequiresApi;
 import androidx.annotation.StringRes;
 import androidx.appcompat.app.AppCompatActivity;
 
 import static net.minetest.minetest.UnzipService.*;
 
 public class MainActivity extends AppCompatActivity {
+	public static final String NOTIFICATION_CHANNEL_ID = "Minetest channel";
+
 	private final static int versionCode = BuildConfig.VERSION_CODE;
 	private static final String SETTINGS = "MinetestSettings";
 	private static final String TAG_VERSION_CODE = "versionCode";
@@ -81,12 +87,18 @@ public class MainActivity extends AppCompatActivity {
 	public void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_main);
+
 		IntentFilter filter = new IntentFilter(ACTION_UPDATE);
 		registerReceiver(myReceiver, filter);
+
 		mProgressBar = findViewById(R.id.progressBar);
 		mTextView = findViewById(R.id.textView);
 		sharedPreferences = getSharedPreferences(SETTINGS, Context.MODE_PRIVATE);
+
 		checkAppVersion();
+
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O)
+			createNotificationChannel();
 	}
 
 	private void checkAppVersion() {
@@ -114,6 +126,28 @@ public class MainActivity extends AppCompatActivity {
 		startActivity(intent);
 	}
 
+	@RequiresApi(Build.VERSION_CODES.O)
+	private void createNotificationChannel() {
+		NotificationManager notifyManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
+		if (notifyManager == null)
+			return;
+
+		NotificationChannel notifyChannel = new NotificationChannel(
+			NOTIFICATION_CHANNEL_ID,
+			getString(R.string.notification_channel_name),
+			NotificationManager.IMPORTANCE_LOW
+		);
+		notifyChannel.setDescription(getString(R.string.notification_channel_description));
+		// Configure the notification channel without sound set
+		notifyChannel.setSound(null, null);
+		notifyChannel.enableLights(false);
+		notifyChannel.enableVibration(false);
+
+		// It is fine to always create the notification channel because creating a channel
+		// with the same ID is the same as overriding it (only its name and description).
+		notifyManager.createNotificationChannel(notifyChannel);
+	}
+
 	@Override
 	public void onBackPressed() {
 		// Prevent abrupt interruption when copy game files from assets

android/app/src/main/java/net/minetest/minetest/UnzipService.java

@@ -22,7 +22,6 @@ package net.minetest.minetest;
 
 import android.app.IntentService;
 import android.app.Notification;
-import android.app.NotificationChannel;
 import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.Context;
@@ -58,9 +57,11 @@ public class UnzipService extends IntentService {
 	private String failureMessage;
 
 	private static boolean isRunning = false;
+
 	public static synchronized boolean getIsRunning() {
 		return isRunning;
 	}
+
 	private static synchronized void setIsRunning(boolean v) {
 		isRunning = v;
 	}
@@ -99,28 +100,13 @@ public class UnzipService extends IntentService {
 		}
 	}
 
+	@NonNull
 	private Notification.Builder createNotification() {
-		String name = "net.minetest.minetest";
-		String channelId = "Minetest channel";
-		String description = "notifications from Minetest";
 		Notification.Builder builder;
 		if (mNotifyManager == null)
 			mNotifyManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
-			int importance = NotificationManager.IMPORTANCE_LOW;
+			builder = new Notification.Builder(this, MainActivity.NOTIFICATION_CHANNEL_ID);
-			NotificationChannel mChannel = null;
-			if (mNotifyManager != null)
-				mChannel = mNotifyManager.getNotificationChannel(channelId);
-			if (mChannel == null) {
-				mChannel = new NotificationChannel(channelId, name, importance);
-				mChannel.setDescription(description);
-				// Configure the notification channel, NO SOUND
-				mChannel.setSound(null, null);
-				mChannel.enableLights(false);
-				mChannel.enableVibration(false);
-				mNotifyManager.createNotificationChannel(mChannel);
-			}
-			builder = new Notification.Builder(this, channelId);
 		} else {
 			builder = new Notification.Builder(this);
 		}
@@ -135,9 +121,9 @@ public class UnzipService extends IntentService {
 		PendingIntent intent = PendingIntent.getActivity(this, 0,
 			notificationIntent, pendingIntentFlag);
 
-		builder.setContentTitle(getString(R.string.notification_title))
+		builder.setContentTitle(getString(R.string.unzip_notification_title))
 				.setSmallIcon(R.mipmap.ic_launcher)
-				.setContentText(getString(R.string.notification_description))
+				.setContentText(getString(R.string.unzip_notification_description))
 				.setContentIntent(intent)
 				.setOngoing(true)
 				.setProgress(0, 0, true);

android/app/src/main/res/values/strings.xml

@@ -2,7 +2,9 @@
 <resources>
 	<string name="label">Minetest</string>
 	<string name="loading">Loading&#8230;</string>
-	<string name="notification_title">Loading Minetest</string>
+	<string name="notification_channel_name">General notification</string>
-	<string name="notification_description">Less than 1 minute&#8230;</string>
+	<string name="notification_channel_description">Notifications from Minetest</string>
+	<string name="unzip_notification_title">Loading Minetest</string>
+	<string name="unzip_notification_description">Less than 1 minute&#8230;</string>
 	<string name="ime_dialog_done">Done</string>
 </resources>