MainService: Now service is stopped if interface goes down

I was capable of implementing an all-Java solution.
For some reason though, I was not capable of making it work with VPNs (needs more testing, I think).

Author: elluisian

app/src/main/java/net/christianbeier/droidvnc_ng/ListenIfAdapter.java

@@ -26,6 +26,9 @@
 
 import android.content.res.Resources;
 import android.content.Context;
+import android.os.Handler;
+import android.os.Looper;
+
 import android.util.Log;
 import android.view.View;
 import android.view.ViewGroup;
@@ -43,6 +46,7 @@ private static class ViewHolder {
     }
 
     // Data to be shown with the adapter
+    private ArrayList<String> dataStr;
     private ArrayList<NetworkInterfaceTester.NetIfData> data;
     private int dataSize;
 
@@ -52,6 +56,9 @@ private static class ViewHolder {
     private LayoutInflater mInflater;
 
 
+    // UI related
+    private Handler handler;
+
 
 
     public ListenIfAdapter(NetworkInterfaceTester nit, Context context) {
@@ -60,8 +67,10 @@ public ListenIfAdapter(NetworkInterfaceTester nit, Context context) {
         this.mContext = context;
         this.mInflater = LayoutInflater.from(this.mContext);
 
+        this.handler = new Handler(Looper.getMainLooper());
+
         nit.addOnNetworkStateChangedListener(this);
-        this.onNetworkStateChanged(nit, null, false);
+        this.onNetworkStateChanged(nit);
     }
 
 
@@ -80,9 +89,19 @@ public int getItemPositionByIfName(String ifName) {
 
 
 
+    @Override
+    public View getDropDownView(int position, View convertView, ViewGroup parent) {
+        return this.handleViewRecreation(position, convertView, parent);
+    }
+
 
     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
+        return this.handleViewRecreation(position, convertView, parent);
+    }
+
+
+    private View handleViewRecreation(int position, View convertView, ViewGroup parent) {
         if (convertView == null) { // Check if view must be recreated using the famous ViewHolder pattern
             convertView = this.mInflater.inflate(R.layout.spinner_row, parent, false);
 
@@ -92,13 +111,14 @@ public View getView(int position, View convertView, ViewGroup parent) {
         }
 
         ViewHolder vh = (ViewHolder)convertView.getTag();
-        NetworkInterfaceTester.NetIfData nid = this.getItem(position);
-        vh.txtLabel.setText(nid.toString());
+        String label = this.dataStr.get(position);
+        vh.txtLabel.setText(label);
 
         return convertView;
     }
 
 
+
     @Override
     public NetworkInterfaceTester.NetIfData getItem(int position) {
         if (0 <= position && position < this.getCount()) {
@@ -108,15 +128,35 @@ public NetworkInterfaceTester.NetIfData getItem(int position) {
     }
 
 
+
     @Override
     public int getCount() {
         return this.dataSize;
     }
 
 
 
-    public void onNetworkStateChanged(NetworkInterfaceTester nit, NetworkInterface iface, boolean enabled) {
+    public void onNetworkStateChanged(NetworkInterfaceTester nit) {
         this.data = nit.getAvailableInterfaces();
         this.dataSize = this.data.size();
+
+        this.dataStr = new ArrayList<>();
+        for (NetworkInterfaceTester.NetIfData nid : this.data) {
+            String actualName = " (" + nid.getName() + ")";
+            String displayName = nid.getDisplayName();
+
+            if (nid.getName().equals("0.0.0.0")) {
+                displayName = this.mContext.getResources().getString(R.string.main_activity_settings_listenif_spin_any);
+            }
+
+            this.dataStr.add(displayName + actualName);
+        }
+
+        // update Spinner
+        this.handler.post(new Runnable() {
+            public void run() {
+                ListenIfAdapter.this.notifyDataSetChanged();
+            }
+        });
     }
 }

app/src/main/java/net/christianbeier/droidvnc_ng/MainActivity.java

@@ -311,7 +311,7 @@ protected void onCreate(Bundle savedInstanceState) {
         });
 
 
-        NetworkInterfaceTester nit = new NetworkInterfaceTester(this);
+        NetworkInterfaceTester nit = NetworkInterfaceTester.getInstance(this);
         ListenIfAdapter lsif = new ListenIfAdapter(nit, this);
         final Spinner listenInterfaceSpin = findViewById(R.id.settings_listening_interface);
         listenInterfaceSpin.setAdapter(lsif);

app/src/main/java/net/christianbeier/droidvnc_ng/MainService.java

@@ -63,7 +63,7 @@
 import java.util.Objects;
 import java.util.concurrent.ConcurrentHashMap;
 
-public class MainService extends Service {
+public class MainService extends Service implements NetworkInterfaceTester.OnNetworkStateChangedListener {
 
     private static final String TAG = "MainService";
     static final int NOTIFICATION_ID = 11;
@@ -188,6 +188,7 @@ public void onCreate() {
         Log.d(TAG, "onCreate");
 
         instance = this;
+        NetworkInterfaceTester.getInstance(this).addOnNetworkStateChangedListener(this);
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
             /*
@@ -926,4 +927,15 @@ static Notification getCurrentNotification() {
             return null;
         }
     }
+
+
+
+
+    public void onNetworkStateChanged(NetworkInterfaceTester nit) {
+        if (isServerActive()) {
+            if (!nit.isIfEnabled(getListenInterface())) {
+                this.stopSelf();
+            }
+        }
+    }
 }