Add dialog when server is unreachable

app/src/main/java/com/cappielloantonio/play/repository/SystemRepository.java

@@ -3,6 +3,7 @@ package com.cappielloantonio.play.repository;
 import android.app.Application;
 
 import androidx.annotation.NonNull;
+import androidx.lifecycle.MutableLiveData;
 
 import com.cappielloantonio.play.App;
 import com.cappielloantonio.play.interfaces.SystemCallback;
@@ -11,6 +12,7 @@ import com.cappielloantonio.play.subsonic.models.SubsonicResponse;
 
 import retrofit2.Call;
 import retrofit2.Callback;
+import retrofit2.Response;
 
 public class SystemRepository {
     private static final String TAG = "SongRepository";
@@ -49,4 +51,27 @@ public class SystemRepository {
                     }
                 });
     }
+
+    public MutableLiveData<Boolean> ping() {
+        MutableLiveData<Boolean> pingResult = new MutableLiveData<>();
+
+        App.getSubsonicClientInstance(application, false)
+                .getSystemClient()
+                .ping()
+                .enqueue(new Callback<SubsonicResponse>() {
+                    @Override
+                    public void onResponse(@NonNull Call<SubsonicResponse> call, @NonNull Response<SubsonicResponse> response) {
+                        if (response.isSuccessful() && response.body() != null) {
+                            pingResult.postValue(true);
+                        }
+                    }
+
+                    @Override
+                    public void onFailure(@NonNull Call<SubsonicResponse> call, @NonNull Throwable t) {
+                        pingResult.postValue(false);
+                    }
+                });
+
+        return pingResult;
+    }
 }

app/src/main/java/com/cappielloantonio/play/ui/activity/MainActivity.java

@@ -3,6 +3,7 @@ package com.cappielloantonio.play.ui.activity;
 import android.content.IntentFilter;
 import android.net.ConnectivityManager;
 import android.os.Bundle;
+import android.util.Log;
 import android.view.View;
 
 import androidx.annotation.NonNull;
@@ -21,6 +22,8 @@ import com.cappielloantonio.play.repository.QueueRepository;
 import com.cappielloantonio.play.service.MusicPlayerRemote;
 import com.cappielloantonio.play.ui.activity.base.BaseActivity;
 import com.cappielloantonio.play.ui.fragment.PlayerBottomSheetFragment;
+import com.cappielloantonio.play.ui.fragment.dialog.PlaylistEditorDialog;
+import com.cappielloantonio.play.ui.fragment.dialog.ServerUnreachableDialog;
 import com.cappielloantonio.play.util.PreferenceUtil;
 import com.cappielloantonio.play.viewmodel.MainViewModel;
 import com.google.android.material.bottomnavigation.BottomNavigationView;
@@ -58,6 +61,12 @@ public class MainActivity extends BaseActivity {
         init();
     }
 
+    @Override
+    protected void onResume() {
+        super.onResume();
+        pingServer();
+    }
+
     @Override
     protected void onDestroy() {
         super.onDestroy();
@@ -187,6 +196,8 @@ public class MainActivity extends BaseActivity {
             navController.navigate(R.id.action_landingFragment_to_loginFragment);
         } else if (Objects.requireNonNull(navController.getCurrentDestination()).getId() == R.id.settingsFragment) {
             navController.navigate(R.id.action_settingsFragment_to_loginFragment);
+        } else if (Objects.requireNonNull(navController.getCurrentDestination()).getId() == R.id.homeFragment) {
+            navController.navigate(R.id.action_homeFragment_to_loginFragment);
         }
     }
 
@@ -235,4 +246,15 @@ public class MainActivity extends BaseActivity {
             unregisterReceiver(connectivityStatusBroadcastReceiver);
         }
     }
+
+    private void pingServer() {
+        if (PreferenceUtil.getInstance(this).getToken() != null) {
+            mainViewModel.ping().observe(this, isPingSuccessfull -> {
+                if(!isPingSuccessfull) {
+                    ServerUnreachableDialog dialog = new ServerUnreachableDialog();
+                    dialog.show(getSupportFragmentManager(), null);
+                }
+            });
+        }
+    }
 }

app/src/main/java/com/cappielloantonio/play/ui/fragment/dialog/ServerUnreachableDialog.java

@@ -0,0 +1,68 @@
+package com.cappielloantonio.play.ui.fragment.dialog;
+
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+
+import androidx.annotation.NonNull;
+import androidx.fragment.app.DialogFragment;
+import androidx.navigation.NavOptions;
+import androidx.navigation.fragment.NavHostFragment;
+
+import com.cappielloantonio.play.R;
+import com.cappielloantonio.play.databinding.DialogServerUnreachableBinding;
+import com.cappielloantonio.play.ui.activity.MainActivity;
+
+import java.util.Objects;
+
+public class ServerUnreachableDialog extends DialogFragment {
+    private static final String TAG = "ServerUnreachableDialog";
+
+    private DialogServerUnreachableBinding bind;
+
+    @NonNull
+    @Override
+    public Dialog onCreateDialog(Bundle savedInstanceState) {
+        bind = DialogServerUnreachableBinding.inflate(LayoutInflater.from(requireContext()));
+
+        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity(), R.style.AppTheme_AlertDialog);
+
+        builder.setView(bind.getRoot())
+                .setTitle(R.string.server_unreachable_dialog_title)
+                .setPositiveButton(R.string.server_unreachable_dialog_positive_button, (dialog, id) -> dialog.cancel())
+                .setNeutralButton(R.string.server_unreachable_dialog_neutral_button, (dialog, id) -> { })
+                .setNegativeButton(R.string.server_unreachable_dialog_negative_button, (dialog, id) -> dialog.cancel());
+
+        return builder.create();
+    }
+
+    @Override
+    public void onStart() {
+        super.onStart();
+
+        setButtonAction();
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        bind = null;
+    }
+
+    private void setButtonAction() {
+        ((AlertDialog) Objects.requireNonNull(getDialog())).getButton(AlertDialog.BUTTON_NEUTRAL).setTextColor(getResources().getColor(R.color.colorAccent, null));
+        ((AlertDialog) Objects.requireNonNull(getDialog())).getButton(AlertDialog.BUTTON_POSITIVE).setTextColor(getResources().getColor(R.color.colorAccent, null));
+        ((AlertDialog) Objects.requireNonNull(getDialog())).getButton(AlertDialog.BUTTON_NEGATIVE).setTextColor(getResources().getColor(R.color.colorAccent, null));
+
+        ((AlertDialog) Objects.requireNonNull(getDialog())).getButton(AlertDialog.BUTTON_NEUTRAL).setOnClickListener(v -> {
+            MainActivity activity = (MainActivity) getActivity();
+
+            if (activity != null) {
+                activity.goToLogin();
+            }
+
+            Objects.requireNonNull(getDialog()).dismiss();
+        });
+    }
+}

app/src/main/java/com/cappielloantonio/play/viewmodel/MainViewModel.java

@@ -4,21 +4,31 @@ import android.app.Application;
 
 import androidx.annotation.NonNull;
 import androidx.lifecycle.AndroidViewModel;
+import androidx.lifecycle.LiveData;
 
 import com.cappielloantonio.play.repository.QueueRepository;
+import com.cappielloantonio.play.repository.SystemRepository;
 
 public class MainViewModel extends AndroidViewModel {
     private static final String TAG = "SearchViewModel";
 
+    private final SystemRepository systemRepository;
+
     private final Application application;
 
     public MainViewModel(@NonNull Application application) {
         super(application);
         this.application = application;
+
+        systemRepository = new SystemRepository(application);
     }
 
     public boolean isQueueLoaded() {
         QueueRepository queueRepository = new QueueRepository(application);
         return queueRepository.count() != 0;
     }
+
+    public LiveData<Boolean> ping() {
+        return systemRepository.ping();
+    }
 }

app/src/main/res/layout/dialog_server_unreachable.xml

@@ -0,0 +1,11 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical">
+
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:gravity="center"
+        android:text="aaaaaa" />
+</LinearLayout>

app/src/main/res/navigation/nav_graph.xml

@@ -4,7 +4,6 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/nav_graph"
     app:startDestination="@id/landingFragment">
-
     <fragment
         android:id="@+id/landingFragment"
         android:name="com.cappielloantonio.play.ui.fragment.LandingFragment"
@@ -21,7 +20,6 @@
             app:popUpTo="@id/landingFragment"
             app:popUpToInclusive="true" />
     </fragment>
-
     <fragment
         android:id="@+id/loginFragment"
         android:name="com.cappielloantonio.play.ui.fragment.LoginFragment"
@@ -38,6 +36,11 @@
         android:name="com.cappielloantonio.play.ui.fragment.HomeFragment"
         android:label="HomeFragment"
         tools:layout="@layout/fragment_home">
+        <action
+            android:id="@+id/action_homeFragment_to_loginFragment"
+            app:destination="@id/loginFragment"
+            app:popUpTo="@id/homeFragment"
+            app:popUpToInclusive="true" />
         <action
             android:id="@+id/action_homeFragment_to_songListPageFragment"
             app:destination="@id/songListPageFragment" />