Android4.0.4系统源码中，横竖屏采用不同的布局，为什么竖屏切换到横屏，有时不会显示歌词

Question

RT。横竖屏采用代码一样，只是布局文件不一样。竖屏播放音乐、显示歌词。此时竖屏切换到横屏，有时不会显示歌词，要再次重新播放歌曲才显示歌词。
请问：这是什么原因呢？

Answer 1

咋没人呢？会不会是控件的问题，歌词显示用了一个ScrollView

Answer 2

应该是切换时又重启了前面的Activity导致的吧，在生命周期的某个方法中再显示一次

Answer 3

切换时并没有重启activity，因为在androidmanifest.xml文件有配置翻转。并且下面函数
onConfigurationChanged在切换时调用了，并没有再次调用onCreate    @Override
    public void onCreate(Bundle icicle)
    {
        super.onCreate(icicle);
        setVolumeControlStream(AudioManager.STREAM_MUSIC);        mAlbumArtWorker = new Worker("album art worker");
        mAlbumArtHandler = new AlbumArtHandler(mAlbumArtWorker.getLooper());        requestWindowFeature(Window.FEATURE_NO_TITLE);
        // Get the current orientation
        mIsLandScape = (getResources().getConfiguration().orientation
                == Configuration.ORIENTATION_LANDSCAPE);
        updateUI();
    }    void updateUI() {
        setContentView(R.layout.audio_player_with_lrc);        mLyricsFrame = (FrameLayout)findViewById(R.id.lyrics_frame); 
  
        mLrcMode = MusicUtils.getIntPref(this, "lyricMode",ScrollLrcView.LRC_MODE_SINGLE);
            mScrollLrcView = (ScrollLrcView) findViewById(R.id.lyrics_view);
            mScrollLrcView.setOnTouchListener(new OnTouchListener() {
                public boolean onTouch(View v, MotionEvent event) {
                    return true;
                }
            });
          ((ImageView) findViewById(R.id.lyrics_shift)).setOnClickListener (
                new View.OnClickListener () {
                    public void onClick(View v) {
                        if (mLrcMode == ScrollLrcView.LRC_MODE_MULTIPLE) {
                            mLrcMode = ScrollLrcView.LRC_MODE_SINGLE;
                        } else if (mLrcMode == ScrollLrcView.LRC_MODE_SINGLE) {
                            mLrcMode = ScrollLrcView.LRC_MODE_MULTIPLE;
                        }
                        MusicUtils.setIntPref(MediaPlaybackActivity.this, "lyricMode", mLrcMode);
        
                        updateLyricsFrame();
                        try {
                            if (!mScrollLrcView.reSetupLyrics(
                                    MediaPlaybackActivity.this, mLrcMode, (int)mService.position())) {
                                return;
                            }
                        } catch (RemoteException ex) {
                            throw new LrcScrollException();
                        }
        
                        mHandler.sendEmptyMessage(UPDATE_LRC);
                    }
                }
            );
        }     @Override
    public void onConfigurationChanged(Configuration newConfig) {        super.onConfigurationChanged(newConfig);
        // When configuration change, get the current orientation
        mIsLandScape = (getResources().getConfiguration().orientation
                == Configuration.ORIENTATION_LANDSCAPE);
        // when configuration changed ,set mIsShowAlbumArt = true to update album art
        mIsShowAlbumArt = true;
        updateUI();
        // When back to this activity, ask service for right position
        mPosOverride = -1;
        
            if (null != mScrollLrcView) {
                mScrollLrcView.resetHighlight();
            }
        // Refresh action bar menu item
        invalidateOptionsMenu();
    }如果在onConfigurationChanged中不调用 updateUI，怎切换时歌词显示正常，但横屏时用的还是竖屏布局。布局不对。原始的布局歌词显示是在最下面，而修改后的竖屏布局如下：<FrameLayout
            android:id="@+id/lyrics_frame"
            android:layout_weight="1"
            android:layout_below="@+id/linear1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical">             <LinearLayout
                android:id="@+id/lyrics_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center_vertical"
                android:orientation="vertical">                 <com.android.music.ScrollLrcView
                    android:id="@+id/lyrics_view"
                    android:layout_width="match_parent"
                    android:layout_height="0dip"
                    android:layout_weight="1"
                    android:fadingEdge="vertical"
                    android:scrollbars="none" />             </LinearLayout>             <ImageView
                android:id="@+id/lyrics_shift"
                android:layout_width="0dip"
                android:layout_height="45dip"
                android:layout_gravity="center_horizontal"
                android:layout_alignParentTop="true"
                android:gravity="top"
                android:focusable="false">
            </ImageView>             <View
                android:layout_width="0dip"
                android:layout_height="1px"
                android:background="#ffffffff">
            </View>         </FrameLayout>
</RelativeLayout>
</RelativeLayout>