Android: Minor Code Improvements (#13342)

android/app/src/main/AndroidManifest.xml

@@ -6,6 +6,7 @@
 
 	<uses-permission android:name="android.permission.INTERNET" />
 	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+	<uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
 	<uses-feature android:glEsVersion="0x00020000" />
 
 	<!--

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

@@ -23,7 +23,6 @@ package net.minetest.minetest;
 import android.app.NativeActivity;
 import android.content.Intent;
 import android.net.Uri;
-import android.os.Build;
 import android.os.Bundle;
 import android.text.InputType;
 import android.util.Log;
@@ -64,11 +63,10 @@ public class GameActivity extends NativeActivity {
 	}
 
 	private void makeFullScreen() {
-		if (Build.VERSION.SDK_INT >= 19)
-			this.getWindow().getDecorView().setSystemUiVisibility(
-					View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
-					View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
-					View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+		this.getWindow().getDecorView().setSystemUiVisibility(
+				View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION |
+				View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
+				View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
 	}
 
 	@Override

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

@@ -182,9 +182,9 @@ public class UnzipService extends IntentService {
 		try {
 			Process p = new ProcessBuilder("/system/bin/mv",
 				src.getAbsolutePath(), dst.getAbsolutePath()).start();
-			int exitcode = p.waitFor();
-			if (exitcode != 0)
-				throw new IOException("Move failed with exit code " + exitcode);
+			int exitCode = p.waitFor();
+			if (exitCode != 0)
+				throw new IOException("Move failed with exit code " + exitCode);
 		} catch (InterruptedException e) {
 			throw new IOException("Move operation interrupted");
 		}

android/gradle.properties

@@ -7,5 +7,5 @@ org.gradle.daemon=true
 org.gradle.parallel=true
 org.gradle.parallel.threads=8
 org.gradle.configureondemand=true
-android.enableJetifier=true
+android.enableJetifier=false
 android.useAndroidX=true