[Android] Scroll current pref fragment to top

[Geoffrey Métais]

vlc-android | branch: master | Geoffrey Métais <geoffrey.metais at gmail.com> | Thu Mar  9 17:12:24 2017 +0100| [42185cf878337ce5852e77bf95bfd8fc02505750] | committer: Geoffrey Métais

Scroll current pref fragment to top

Close #228

> https://code.videolan.org/videolan/vlc-android/commit/42185cf878337ce5852e77bf95bfd8fc02505750
---

 vlc-android/res/layout/preferences_activity.xml                    | 1 +
 .../org/videolan/vlc/gui/preferences/BasePreferenceFragment.java   | 4 ++--
 .../src/org/videolan/vlc/gui/preferences/PreferencesActivity.java  | 7 +++++++
 3 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/vlc-android/res/layout/preferences_activity.xml b/vlc-android/res/layout/preferences_activity.xml
index b32ed3d..5e25f59 100644
--- a/vlc-android/res/layout/preferences_activity.xml
+++ b/vlc-android/res/layout/preferences_activity.xml
@@ -7,6 +7,7 @@
 
     <include layout="@layout/toolbar"/>
     <android.support.v4.widget.NestedScrollView
+        android:id="@+id/nestedscrollview"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         vlc:layout_behavior="@string/appbar_scrolling_view_behavior" >
diff --git a/vlc-android/src/org/videolan/vlc/gui/preferences/BasePreferenceFragment.java b/vlc-android/src/org/videolan/vlc/gui/preferences/BasePreferenceFragment.java
index 7f0c7e2..5773c60 100644
--- a/vlc-android/src/org/videolan/vlc/gui/preferences/BasePreferenceFragment.java
+++ b/vlc-android/src/org/videolan/vlc/gui/preferences/BasePreferenceFragment.java
@@ -27,7 +27,6 @@ import android.os.Bundle;
 import android.support.v14.preference.MultiSelectListPreference;
 import android.support.v4.app.DialogFragment;
 import android.support.v4.app.Fragment;
-import android.support.v7.app.AppCompatActivity;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceFragmentCompat;
 
@@ -50,7 +49,8 @@ public abstract class BasePreferenceFragment extends PreferenceFragmentCompat {
     @Override
     public void onStart() {
         super.onStart();
-        final AppCompatActivity activity = (AppCompatActivity)getActivity();
+        final PreferencesActivity activity = (PreferencesActivity)getActivity();
+        activity.scrollUp();
         if (activity != null && activity.getSupportActionBar() != null) {
             activity.getSupportActionBar().setTitle(getString(getTitleId()));
         }
diff --git a/vlc-android/src/org/videolan/vlc/gui/preferences/PreferencesActivity.java b/vlc-android/src/org/videolan/vlc/gui/preferences/PreferencesActivity.java
index af4c665..990f940 100644
--- a/vlc-android/src/org/videolan/vlc/gui/preferences/PreferencesActivity.java
+++ b/vlc-android/src/org/videolan/vlc/gui/preferences/PreferencesActivity.java
@@ -24,6 +24,7 @@ import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
+import android.support.v4.widget.NestedScrollView;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
@@ -55,6 +56,7 @@ public class PreferencesActivity extends AppCompatActivity implements PlaybackSe
 
     private PlaybackService.Client mClient = new PlaybackService.Client(this, this);
     private PlaybackService mService;
+    private NestedScrollView nestedScrollView;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -70,6 +72,11 @@ public class PreferencesActivity extends AppCompatActivity implements PlaybackSe
                     .replace(R.id.fragment_placeholder, new PreferencesFragment())
                     .commit();
         }
+        nestedScrollView = (NestedScrollView) findViewById(R.id.nestedscrollview);
+    }
+
+    void scrollUp() {
+        nestedScrollView.scrollTo(0,0);
     }
 
     @Override