[#198] Display different error if there's no connection

app/src/main/java/nl/eduvpn/app/utils/ErrorDialog.kt

@@ -0,0 +1,98 @@
+/*
+ *  This file is part of eduVPN.
+ *
+ *     eduVPN is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     eduVPN is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with eduVPN.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package nl.eduvpn.app.utils
+
+import android.app.Dialog
+import android.content.Context
+import android.view.View
+import android.widget.Button
+import android.widget.TextView
+
+import androidx.annotation.StringRes
+import nl.eduvpn.app.R
+import android.net.NetworkInfo
+import androidx.core.content.ContextCompat.getSystemService
+import android.net.ConnectivityManager
+
+
+
+/**
+ * Utility class for displaying error dialogs through the entire application.
+ * Created by Daniel Zolnai on 2016-10-12.
+ */
+object ErrorDialog {
+
+    /**
+     * Shows a new error dialog.
+     *
+     * @param context The application or activity context.
+     * @param title   The title of the dialog (string resource ID).
+     * @param message The message to show as a string.
+     */
+    @JvmStatic
+    fun show(context: Context, @StringRes title: Int, message: String): Dialog {
+        return show(context, context.getString(title), message)
+    }
+
+    /**
+     * Shows a new error dialog.
+     *
+     * @param context The application or activity context.
+     * @param title   The title of the dialog (string resource ID).
+     * @param message The message to show (string resource ID).
+     */
+    @JvmStatic
+    fun show(context: Context, @StringRes title: Int, @StringRes message: Int): Dialog {
+        return show(context, context.getString(title), context.getString(message))
+    }
+
+    /**
+     * Shows a new error dialog
+     *
+     * @param context The application or activity context.
+     * @param title   The title of the dialog.
+     * @param message The message to show.
+     */
+    @JvmStatic
+    fun show(context: Context, title: String, message: String): Dialog {
+        val dialog = Dialog(context, R.style.ErrorDialog)
+        dialog.setCanceledOnTouchOutside(true)
+        dialog.setContentView(R.layout.dialog_error)
+        val view = dialog.findViewById<View>(R.id.errorDialog)
+        val titleView = view.findViewById<TextView>(R.id.title)
+        val errorTextView = view.findViewById<TextView>(R.id.errorText)
+        val confirmButton = view.findViewById<Button>(R.id.confirmButton)
+        if (hasNetworkConnection(context)) {
+            titleView.text = title
+            errorTextView.text = message
+        } else {
+            titleView.setText(R.string.error_no_internet_connection)
+            errorTextView.text = context.getString(R.string.error_no_internet_connection_message, message)
+        }
+        confirmButton.setOnClickListener { dialog.dismiss() }
+        dialog.show()
+        return dialog
+    }
+
+    @Suppress("DEPRECATION")
+    fun hasNetworkConnection(context: Context) : Boolean {
+        val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager?
+        val activeNetworkInfo = connectivityManager?.activeNetworkInfo
+        return activeNetworkInfo?.isConnected == true
+    }
+}

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

@@ -115,5 +115,7 @@
     <string name="error_parsing_profiles">Unable to parse the profile list.</string>
     <string name="select_a_profile_title">Select a profile</string>
     <string name="loading_browser_for_authorization">Loading browser for authorization</string>
+    <string name="error_no_internet_connection">No internet connection</string>
+    <string name="error_no_internet_connection_message">It seems that you have no connection to the internet. Please check your connection, and try again.\nOriginal error: %s</string>
 
 </resources>