Question

我正在创建一个显示视频列表（VideoListingActivity）的活动，具体取决于从父activity.my传递的参数。我试图将传递给VideoListingActivity的包传递给它的子片段，以便它可以获取相关数据从数据库中显示它在活动上。我试图使用Fragment.setArguments（）将包传递给片段，但得到以下错误。

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rrdtech.vidyavaan.android/com.rrdtech.vidyavaan.android.VideoListingActivity}: java.lang.IllegalStateException: Fragment already active

我认为片段附加到onCreate（）的活动帖子，所以甚至会引发这个错误吗？

以下是我的活动和片段的代码

VideoListingActivity.java

 public class VideoListingActivity extends ActionBarActivity   implements   FilterFragment.OnFilterItemSelectedListener,
    android.support.v7.widget.SearchView.OnQueryTextListener
{

 public VideoListFragment videoListFragment;
 private android.support.v7.widget.SearchView searchView;
 private  Context context;
private Bundle bundle;
private String listBy;
private String subjectId;
private String levelType;
private FragmentTransaction ft;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_video_listing);

   // videoListFragment=new VideoListFragment();
    videoListFragment= (VideoListFragment) getFragmentManager().findFragmentById(R.id.frg_video_listing_video_listing_fragment);
     ft =getFragmentManager().beginTransaction();
    context=this;
    bundle = new Bundle();
    bundle = getIntent().getExtras();
    videoListFragment.setArguments(bundle);

}

@Override
protected void onStart() {
    super.onStart();

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_video_listing, menu);
    MenuItem menuItem=menu.findItem(R.id.item_action_search);

    //SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
     searchView = (android.support.v7.widget.SearchView) menu.findItem(R.id.item_action_search).getActionView();
    setupSearchView(menuItem);
    //searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

    return super.onCreateOptionsMenu(menu);
}

public  void setupSearchView(MenuItem searchItem)
{

    SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
    if(searchManager != null)
    {
        SearchableInfo info = searchManager.getSearchableInfo(getComponentName());
        searchView.setSearchableInfo(info);
    }
    searchView.setOnQueryTextListener(this);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}


@Override
public void onFilterItemSelected(String filterId) {
    videoListFragment.filterSelectedAction("filter id is "+filterId);
}

@Override
public boolean onQueryTextSubmit(String query) {
    CommonFunctions commonFunctions = new CommonFunctions();
    commonFunctions.showProgressDialog(context,"getting data","bringing");

    ft.replace(R.id.frg_video_listing_filter_fragment,videoListFragment);
    ft.commit();
    commonFunctions.dismissProgressDialog();
    return false;
}

@Override
public boolean onQueryTextChange(String newText) {
    return false;
}
}

VideoListingFragment.java

public class VideoListFragment extends Fragment {

private ListView videoListView;
private Context activityContext;
private VideosListAdapter listAdapter;
private List<Video> videosList;
private  Bundle b;
private String listBy;
private String subjectId;
private String levelType;

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    activityContext = activity.getApplicationContext();
    b=new Bundle();
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    return inflater.inflate(R.layout.video_list_fragment,container,false);


}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    b= getArguments();
    listBy = b.getString(VidyavaanGlobal.listBy);
    Log.d("list by ",listBy);
}

@Override
public void onStart() {
    super.onStart();
}


public void filterSelectedAction(String x)
{
    Log.d("passed is ", x);
}

public void fillData()
{
    videosList.add(new Video("chapter1","title1", "pragyan public school", "pawan saraskar", "Chemistry", "Advance", "abcd url", "21", "5/6/2015", "thumbnail url"));
    videosList.add(new Video("chapter2","title2","pragyan public school","pawan saraskar","physics","Advance","abcd url","21","5/6/2015","thumbnail url"));
    videosList.add(new Video("chapter3","title3","pragyan public school","pawan saraskar","english","Advance","abcd url","21","5/6/2015","thumbnail url"));
    videosList.add(new Video("chapter4","title4","pragyan public school","pawan saraskar","Chemistry","Advance","abcd url","21","5/6/2015","thumbnail url"));
    videosList.add(new Video("chapter5","title5","pragyan public school","pawan saraskar","Chemistry","Advance","abcd url","21","5/6/2015","thumbnail url"));
    videosList.add(new Video("chapter6","title6","pragyan public school","pawan saraskar","Chemistry","Advance","abcd url","21","5/6/2015","thumbnail url"));
    videosList.add(new Video("chapter7", "title7", "pragyan public school", "pawan saraskar", "Chemistry", "Advance", "abcd url", "21", "5/6/2015", "thumbnail url"));
}


public void displayVideoList(boolean searchReqeust )
{

}

public void displayVideoList(String pListBy, String pValue)

{



    listAdapter = new VideosListAdapter(activityContext,videosList);
    videoListView.setAdapter(listAdapter);
}

public void displayVideoList(String subjectId, String videoType, String VideoLevel)
{

}


}

可以请一位帮忙。提前谢谢。

Answer 1

来自官方Android开发参考：

Public void setArguments（Bundle args）提供构造这个片段的参数。这只能在之前调用片段已附加到其活动;也就是说，你应该打电话它在构建片段后立即生效。提供的论据这里将保留片段销毁和创建。

您的片段已附加到其活动中我建议您使用自己的方法，不需要@Override public void onBackPressed() { Log.d("back", "onBackPressed Called"); // Do your stuff here }！

在片段类中创建自己的setArguments并更新此方法中的片段UI

您将以这种方式调用此方法：

setUIArguments(Bundle args)

片段类

中的

@Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        Detailfragment detailFragment = (Detailfragment)getFragmentManager().findFragmentById(detailFragmentID);

        Bundle bundle = new Bundle();
        bundle.putSerializable(BUNDLE_KEY, obj);// passing this object

        detailFragment.setUIArguments(bundle); /* your new method */
}

Answer 2

致电

bundle = new Bundle();
bundle = getIntent().getExtras();
videoListFragment.setArguments(bundle);

之前

 ft =getFragmentManager().beginTransaction();

线。

Answer 3

在添加bundle作为参数后尝试调用ft =getFragmentManager().beginTransaction();。

片段在调用Fragment.setArguments（）

3 个答案: