fixed #544

src/main/java/eu/siacs/conversations/ui/SettingsFragment.java

@@ -1,10 +1,51 @@
 package eu.siacs.conversations.ui;
 
-import eu.siacs.conversations.R;
+import android.app.Dialog;
 import android.os.Bundle;
+import android.preference.Preference;
 import android.preference.PreferenceFragment;
+import android.preference.PreferenceScreen;
+import android.view.View;
+import android.view.ViewGroup;
+import android.view.ViewParent;
+import android.widget.FrameLayout;
+import android.widget.LinearLayout;
+
+import eu.siacs.conversations.R;
 
 public class SettingsFragment extends PreferenceFragment {
+
+	//http://stackoverflow.com/questions/16374820/action-bar-home-button-not-functional-with-nested-preferencescreen/16800527#16800527
+	private void initializeActionBar(PreferenceScreen preferenceScreen) {
+		final Dialog dialog = preferenceScreen.getDialog();
+
+		if (dialog != null) {
+			View homeBtn = dialog.findViewById(android.R.id.home);
+
+			if (homeBtn != null) {
+				View.OnClickListener dismissDialogClickListener = new View.OnClickListener() {
+					@Override
+					public void onClick(View v) {
+						dialog.dismiss();
+					}
+				};
+
+				ViewParent homeBtnContainer = homeBtn.getParent();
+
+				if (homeBtnContainer instanceof FrameLayout) {
+					ViewGroup containerParent = (ViewGroup) homeBtnContainer.getParent();
+					if (containerParent instanceof LinearLayout) {
+						((LinearLayout) containerParent).setOnClickListener(dismissDialogClickListener);
+					} else {
+						((FrameLayout) homeBtnContainer).setOnClickListener(dismissDialogClickListener);
+					}
+				} else {
+					homeBtn.setOnClickListener(dismissDialogClickListener);
+				}
+			}
+		}
+	}
+
 	@Override
 	public void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
@@ -12,4 +53,13 @@ public class SettingsFragment extends PreferenceFragment {
 		// Load the preferences from an XML resource
 		addPreferencesFromResource(R.xml.preferences);
 	}
+
+	@Override
+	public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
+		super.onPreferenceTreeClick(preferenceScreen, preference);
+		if (preference instanceof PreferenceScreen) {
+			initializeActionBar((PreferenceScreen) preference);
+		}
+		return false;
+	}
 }