Use an dialog to show advanced settings

app/src/main/java/com/github/gotify/login/AdvancedDialog.java

@@ -0,0 +1,96 @@
+package com.github.gotify.login;
+
+import android.app.AlertDialog;
+import android.content.Context;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.Button;
+import android.widget.CheckBox;
+import android.widget.CompoundButton;
+import android.widget.TextView;
+import androidx.annotation.Nullable;
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import com.github.gotify.R;
+
+class AdvancedDialog {
+
+    private Context context;
+    private ViewHolder holder;
+    private CompoundButton.OnCheckedChangeListener onCheckedChangeListener;
+    private Runnable onClickSelectCaCertificate;
+    private Runnable onClickRemoveCaCertificate;
+
+    AdvancedDialog(Context context) {
+        this.context = context;
+    }
+
+    AdvancedDialog onDisableSSLChanged(
+            CompoundButton.OnCheckedChangeListener onCheckedChangeListener) {
+        this.onCheckedChangeListener = onCheckedChangeListener;
+        return this;
+    }
+
+    AdvancedDialog onClickSelectCaCertificate(Runnable onClickSelectCaCertificate) {
+        this.onClickSelectCaCertificate = onClickSelectCaCertificate;
+        return this;
+    }
+
+    AdvancedDialog onClickRemoveCaCertificate(Runnable onClickRemoveCaCertificate) {
+        this.onClickRemoveCaCertificate = onClickRemoveCaCertificate;
+        return this;
+    }
+
+    AdvancedDialog show(boolean disableSSL, @Nullable String selectedCertificate) {
+
+        View dialogView =
+                LayoutInflater.from(context).inflate(R.layout.advanced_settings_dialog, null);
+        holder = new ViewHolder(dialogView);
+        holder.disableSSL.setChecked(disableSSL);
+        holder.disableSSL.setOnCheckedChangeListener(onCheckedChangeListener);
+
+        if (selectedCertificate == null) {
+            showSelectCACertificate();
+        } else {
+            showRemoveCACertificate(selectedCertificate);
+        }
+
+        new AlertDialog.Builder(context)
+                .setView(dialogView)
+                .setTitle("Advanced Settings")
+                .setPositiveButton("Done", (ignored, ignored2) -> {})
+                .show();
+        return this;
+    }
+
+    private void showSelectCACertificate() {
+        holder.toggleCaCert.setText("Select CA Certificate");
+        holder.toggleCaCert.setOnClickListener((a) -> onClickSelectCaCertificate.run());
+        holder.selectedCaCertificate.setText("No certificate selected");
+    }
+
+    void showRemoveCACertificate(String certificate) {
+        holder.toggleCaCert.setText("Remove CA Certificate");
+        holder.toggleCaCert.setOnClickListener(
+                (a) -> {
+                    showSelectCACertificate();
+                    onClickRemoveCaCertificate.run();
+                });
+        holder.selectedCaCertificate.setText(certificate);
+    }
+
+    class ViewHolder {
+        @BindView(R.id.disableSSL)
+        CheckBox disableSSL;
+
+        @BindView(R.id.toggle_ca_cert)
+        Button toggleCaCert;
+
+        @BindView(R.id.seleceted_ca_cert)
+        TextView selectedCaCertificate;
+
+        ViewHolder(View view) {
+            ButterKnife.bind(this, view);
+        }
+    }
+}