Make Downloader class a Singleton

app/src/main/java/org/schabi/newpipe/App.java

@@ -62,7 +62,7 @@ public class App extends Application {
         }
 
         //init NewPipe
-        NewPipe.init(new Downloader());
+        NewPipe.init(Downloader.getInstance());
 
         // Initialize image loader
         ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this).build();

app/src/main/java/org/schabi/newpipe/Downloader.java

@@ -36,6 +36,21 @@ public class Downloader implements org.schabi.newpipe.extractor.Downloader {
     
     private static final String USER_AGENT = "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0";
 
+    private static Downloader instance = null;
+
+    private Downloader() {}
+
+    public static Downloader getInstance() {
+        if(instance == null) {
+            synchronized (Downloader.class) {
+                if (instance == null) {
+                    instance = new Downloader();
+                }
+            }
+        }
+        return instance;
+    }
+
     /**Download the text file at the supplied URL as in download(String),
      * but set the HTTP header field "Accept-Language" to the supplied string.
      * @param siteUrl the URL of the text file to return the contents of

app/src/main/java/org/schabi/newpipe/report/ErrorActivity.java

@@ -473,7 +473,7 @@ public class ErrorActivity extends AppCompatActivity {
         public void run() {
             String ipRange = "none";
             try {
-                Downloader dl = new Downloader();
+                Downloader dl = Downloader.getInstance();
                 String ip = dl.download("https://ifcfg.me/ip");
 
                 ipRange = Parser.matchGroup1("([0-9]*\\.[0-9]*\\.)[0-9]*\\.[0-9]*", ip)