ConfigListPreference: ListPreference for configs

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/android/ConfigListPreference.java

@@ -0,0 +1,35 @@
+package com.wireguard.android;
+
+import android.content.Context;
+import android.preference.ListPreference;
+import android.util.AttributeSet;
+
+import java.util.Set;
+
+/**
+ * ListPreference that is automatically filled with the list of configurations.
+ */
+
+public class ConfigListPreference extends ListPreference {
+    public ConfigListPreference(final Context context, final AttributeSet attrs,
+                                final int defStyleAttr, final int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        final Set<String> entrySet = VpnService.getInstance().getConfigs().keySet();
+        final CharSequence[] entries = entrySet.toArray(new CharSequence[entrySet.size()]);
+        setEntries(entries);
+        setEntryValues(entries);
+    }
+
+    public ConfigListPreference(final Context context, final AttributeSet attrs,
+                                final int defStyleAttr) {
+        this(context, attrs, defStyleAttr, 0);
+    }
+
+    public ConfigListPreference(final Context context, final AttributeSet attrs) {
+        this(context, attrs, android.R.attr.dialogPreferenceStyle);
+    }
+
+    public ConfigListPreference(final Context context) {
+        this(context, null);
+    }
+}