[mobile] fix some bug

app/src/leanback/java/com/fongmi/android/tv/ui/activity/DetailActivity.java

@@ -416,7 +416,7 @@ public class DetailActivity extends BaseActivity implements CustomKeyDownVod.Lis
         onRefresh();
     }
 
-    private void reverseEpisode() {
+    private void reverseEpisode(boolean scroll) {
         for (int i = 0; i < mFlagAdapter.size(); i++) Collections.reverse(((Vod.Flag) mFlagAdapter.get(i)).getEpisodes());
         setEpisodeAdapter(getFlag().getEpisodes());
         mBinding.episode.setSelectedPosition(getEpisodePosition());

app/src/mobile/java/com/fongmi/android/tv/ui/activity/DetailActivity.java

@@ -398,9 +398,10 @@ public class DetailActivity extends BaseActivity implements CustomKeyDownVod.Lis
         onItemClick(episode);
     }
 
-    private void reverseEpisode() {
+    private void reverseEpisode(boolean scroll) {
         mFlagAdapter.reverse();
         setEpisodeAdapter(getFlag().getEpisodes());
+        if (scroll) mBinding.episode.scrollToPosition(mEpisodeAdapter.getPosition());
     }
 
     private void onMore() {
@@ -411,7 +412,7 @@ public class DetailActivity extends BaseActivity implements CustomKeyDownVod.Lis
 
     private void onReverse() {
         mHistory.setRevSort(!mHistory.isRevSort());
-        reverseEpisode();
+        reverseEpisode(false);
     }
 
     private void onFull() {
@@ -659,7 +660,7 @@ public class DetailActivity extends BaseActivity implements CustomKeyDownVod.Lis
         mHistory = History.find(getHistoryKey());
         mHistory = mHistory == null ? createHistory(item) : mHistory;
         onItemClick(mHistory.getFlag());
-        if (mHistory.isRevSort()) reverseEpisode();
+        if (mHistory.isRevSort()) reverseEpisode(true);
         mBinding.control.opening.setText(mHistory.getOpening() == 0 ? getString(R.string.play_op) : mPlayers.stringToTime(mHistory.getOpening()));
         mBinding.control.ending.setText(mHistory.getEnding() == 0 ? getString(R.string.play_ed) : mPlayers.stringToTime(mHistory.getEnding()));
         mBinding.control.speed.setText(mPlayers.setSpeed(mHistory.getSpeed()));

app/src/mobile/java/com/fongmi/android/tv/ui/activity/MainActivity.java

@@ -105,16 +105,10 @@ public class MainActivity extends BaseActivity implements NavigationBarView.OnIt
 
     @Override
     public boolean onNavigationItemSelected(@NonNull MenuItem item) {
-        switch (item.getItemId()) {
-            case R.id.vod:
-                mManager.change(0);
-                return true;
-            case R.id.setting:
-                mManager.change(1);
-                return true;
-            default:
-                return false;
-        }
+        if (mBinding.navigation.getSelectedItemId() == item.getItemId()) return false;
+        if (item.getItemId() == R.id.vod) return mManager.change(0);
+        if (item.getItemId() == R.id.setting) return mManager.change(1);
+        return false;
     }
 
     @Override

app/src/mobile/java/com/fongmi/android/tv/ui/custom/FragmentStateManager.java

@@ -20,7 +20,7 @@ public abstract class FragmentStateManager {
 
     public abstract Fragment getItem(int position);
 
-    public void change(int position) {
+    public boolean change(int position) {
         FragmentTransaction ft = fm.beginTransaction();
         Fragment fragment = fm.findFragmentByTag(getTag(position));
         if (fragment == null) ft.add(container.getId(), fragment = getItem(position), getTag(position));
@@ -30,6 +30,7 @@ public abstract class FragmentStateManager {
         ft.setPrimaryNavigationFragment(fragment);
         ft.setReorderingAllowed(true);
         ft.commitNowAllowingStateLoss();
+        return true;
     }
 
     private String getTag(int position) {