java - fragment 替换/添加导致 IllegalStateException

Question

所以我最近开始使用 fragment 并尝试了解一切是如何工作的。我已经把它们放在一起了，但我的应用程序总是崩溃。任何关于正在发生的事情的提示将不胜感激，并且解释为什么也很棒。我正在尝试在 fragment 中加载 YouTube 视频，该 fragment 加载到 ListView 适配器传递给我的 View 中。这是我的设置:

我为 YouTube 视频设置了一个 fragment :

public class PlayerYouTubeFrag extends YouTubePlayerSupportFragment {

private String currentVideoID = "Adp1TUDRNtc";
private YouTubePlayer activePlayer;

public static PlayerYouTubeFrag newInstance(String url) {

PlayerYouTubeFrag playerYouTubeFrag = new PlayerYouTubeFrag();

    Bundle bundle = new Bundle();
    bundle.putString("url", url);

    playerYouTubeFrag.setArguments(bundle);

    return playerYouTubeFrag;
}

private void init() {

    initialize("AIzaSyCQxLWF1j0XFwKmros9w4Y5XSk1hqpEg6Q", new OnInitializedListener() {

        @Override
        public void onInitializationFailure(Provider arg0, YouTubeInitializationResult arg1) { }

        @Override
        public void onInitializationSuccess(YouTubePlayer.Provider provider, YouTubePlayer player, boolean wasRestored) {
            activePlayer = player;
            activePlayer.setPlayerStyle(YouTubePlayer.PlayerStyle.DEFAULT);
            if (!wasRestored) {
                activePlayer.loadVideo(getArguments().getString("url"), 0);

            }
        }
    });
}
}

现在我还有一个设置 fragment 和交换的类:

 public class Youtube extends FragmentActivity{
 public static final String API_KEY = "MyKey";
 public static final String VIDEO_ID = "videoID";
 public  YouTubePlayerView youTubePlayerView;

 public Youtube(View view) {

     //issue here!!!
     PlayerYouTubeFrag myFragment = PlayerYouTubeFrag.newInstance("Adp1TUDRNtc");
    getSupportFragmentManager().beginTransaction().replace(view.findViewById(R.id.placeholder).getId(), myFragment).commit();
 }

最后但并非最不重要的一点是我的 xml:

   <FrameLayout
   android:id="@+id/placeholder"
   android:layout_height="match_parent"
    android:layout_width="match_parent">
  </FrameLayout>

日志猫:

05-01 15:40:42.439: E/AndroidRuntime(24550): FATAL EXCEPTION: main
05-01 15:40:42.439: E/AndroidRuntime(24550): Process: com.elmehalawi.hamra, PID: 24550
05-01 15:40:42.439: E/AndroidRuntime(24550): java.lang.IllegalStateException: Activity has been destroyed
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1365)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at and roid.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:595)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:574)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at com.elmehalawi.hamra.cards.Youtube.<init>(Youtube.java:31)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at com.elmehalawi.hamra.cards.YoutubeCard.setupInnerViewElements(YoutubeCard.java:23)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at it.gmariotti.cardslib.library.internal.Card.getInnerView(Card.java:250)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at it.gmariotti.cardslib.library.view.CardView.setupMainView(CardView.java:364)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at it.gmariotti.cardslib.library.view.CardView.buildUI(CardView.java:270)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at it.gmariotti.cardslib.library.view.CardView.setCard(CardView.java:230)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at com.elmehalawi.hamra.FeedAdapter.getView(FeedAdapter.java:96)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.widget.AbsListView.obtainView(AbsListView.java:2263)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.widget.ListView.onMeasure(ListView.java:1175)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.view.View.measure(View.java:16497)
05-01 15:40:42.439: E/AndroidRuntime(24550):    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)

Answer 1

您不应该在 Activity 的构造函数中进行任何初始化(尤其是 Fragment 事务)。初始化应该在 onCreate

中进行

public class Youtube extends FragmentActivity {
    public static final String API_KEY = "MyKey";
    public static final String VIDEO_ID = "videoID";
    public YouTubePlayerView youTubePlayerView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        PlayerYouTubeFrag myFragment = PlayerYouTubeFrag.newInstance("Adp1TUDRNtc");
        getSupportFragmentManager().beginTransaction().replace(view.findViewById(R.id.placeholder).getId(), myFragment).commit();
    }
}