android - ShowcaseView - 宽度和高度必须 > 0

Question

研究无果而终，因为所有其他对此错误的引用似乎都可以可靠地重复；我无法始终如一地重复此错误:

08-22 17:32:25.216  22699-22699/com.smbds.punisher11 E/AndroidRuntime﹕ FATAL EXCEPTION: main
    java.lang.IllegalArgumentException: width and height must be > 0
            at android.graphics.Bitmap.createBitmap(Bitmap.java:1023)
            at android.graphics.Bitmap.createBitmap(Bitmap.java:1002)
            at android.graphics.Bitmap.createBitmap(Bitmap.java:985)
            at com.github.amlcurran.showcaseview.ShowcaseView.updateBitmap(ShowcaseView.java:171)
            at com.github.amlcurran.showcaseview.ShowcaseView.onGlobalLayout(ShowcaseView.java:354)
            at android.view.ViewTreeObserver.dispatchOnGlobalLayout(ViewTreeObserver.java:655)
            at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2054)
            at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1190)
            at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4860)
            at android.view.Choreographer$CallbackRecord.run(Choreographer.java:766)
            at android.view.Choreographer.doCallbacks(Choreographer.java:575)
            at android.view.Choreographer.doFrame(Choreographer.java:542)
            at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:751)
            at android.os.Handler.handleCallback(Handler.java:725)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:158)
            at android.app.ActivityThread.main(ActivityThread.java:5751)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
            at dalvik.system.NativeStart.main(Native Method)

正如我上面所说，这个错误不会一直发生。它似乎发生了大约(但不完全是)2-3 次，然后 2-3 次运行没有问题。

这是我的资源文件:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container_fragment_person_list"
    android:tag="PersonListFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".fragments.PersonListFragment">

    <TextView
        android:id="@+id/textView_add_guardian_placeholder"
        android:layout_centerInParent="true"
        android:layout_width="1dp"
        android:layout_height="1dp" />

    <TextView
        android:id="@+id/textView_intro_placeholder"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:minWidth="1dp"
        android:minHeight="1dp"
        android:layout_width="1dp"
        android:layout_height="1dp" />

    <ListView
        android:visibility="gone"
        android:id="@id/android:list"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <LinearLayout
        android:orientation="vertical"
        android:id="@id/android:empty"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center" >

        <TextView
            android:text="@string/no_people"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

        <ImageButton
            android:id="@+id/imageButton_empty_text"
            android:src="@drawable/ic_man_silhouette_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:contentDescription="@string/generic_content_description"/>

        <TextView
            android:id="@+id/test"
            android:text="@string/tap_icon_to_add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

    </LinearLayout>

</RelativeLayout>

这是我的 java.lang.请注意，我什至尝试为我的 ViewTarget 硬编码宽度和高度，但仍然出现不一致的错误。我还尝试在我的资源文件中创建占位符 TextView，但仍然不行。

public class PersonListFragment extends BaseListFragment {

    private PersonAdapter personAdapter;
    private PersonModel personModel;
    private int personCount;
    private TextView tvTargetIntro;

    public static PersonListFragment newInstance(String tag, Long index) {
        PersonListFragment fragment = new PersonListFragment();
        Bundle args = new Bundle();
        args.putString(TAG, tag);
        args.putLong(INDEX, index);
        fragment.setArguments(args);
        return fragment;
    }

    public PersonListFragment() {
    }

    @SuppressWarnings("UnusedDeclaration")
    public void onEventMainThread(People_FetchedEvent ignored) {
        refreshList();
    }

    @SuppressWarnings("UnusedDeclaration")
    public void onEventMainThread(Person_CreatedEvent ignored) {
        String createType;
        if(ignored.getId() == 0 | ignored.getPerson().getId() == null) {
            createType = resources.getString(R.string.added);
        } else {
            createType = resources.getString(R.string.updated);
        }
        MessageManager.getInstance().makeToast(getActivity(), ignored.getPerson().getName(), " ", createType);
        fm.popBackStack();
        refreshList();
    }

    @SuppressWarnings("UnusedDeclaration")
    public void onEventMainThread(Person_BuiltEvent ignored) {
        makeCreatePersonBackgroundTask(ignored.getPerson());
    }

    @SuppressWarnings("UnusedDeclaration")
    public void onEventMainThread(Person_DeletingEvent ignored) {
        personModel.deletePersonByLocalId(ignored.getId());
        MessageManager.getInstance().makeToast(getActivity(), PersonController.getInstance().getCurrentPerson().getName() + " " + resources.getString(R.string.removed));
        refreshList();
        FragmentManager fm = getChildFragmentManager();
        fm.popBackStack();
    }

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

        personModel = PersonModel.getInstance();
        personAdapter = new PersonAdapter(getActivity().getLayoutInflater(), getActivity(), ListType.PROFILE_INFO);
        setListAdapter(personAdapter);
        personCount = PersonModel.getInstance().getPersonCount();
    }

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

        LinearLayout layoutEmptyList = (LinearLayout) view.findViewById(android.R.id.empty);
        tvTargetIntro = (TextView) view.findViewById(R.id.textView_intro_placeholder);
        ImageButton imageButtonEmptyText = (ImageButton) view.findViewById(R.id.imageButton_empty_text);
        imageButtonEmptyText.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FragmentTransaction ft;
                ft = fm.beginTransaction();
                ft.replace(R.id.container_fragment_person_list, PersonEditFragment.newInstance("PERSON_EDIT_FRAGMENT", (long) 0, new Person()), "PERSON_EDIT_FRAGMENT");
                ft.addToBackStack(null);
                ft.commit();
                fm.executePendingTransactions();
            }
        });


        switch(personCount) {
            case 0:
                break;
            case 1:
                break;
            default:
        }

        return view;
    }

    private void makeShowCaseIntro() {
        ViewTarget target1 = new ViewTarget(tvTargetIntro);
        tvTargetIntro.setWidth(1);
        tvTargetIntro.setHeight(1);
        ShowcaseView sv = new ShowcaseView.Builder(getActivity())
                .setTarget(target1)
                .setContentTitle(resources.getString(R.string.showcase_intro_title))
                .setContentText(resources.getString(R.string.showcase_intro_text))
                .setStyle(R.style.CustomShowcaseTheme2)
                .build();
        sv.setButtonText(resources.getString(R.string.next));
        sv.show();
    }

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

        makeShowCaseIntro();

    }

    @Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);

        PersonController.getInstance().setCurrentPerson(personAdapter.getItem(position));

        FragmentTransaction ft = fm.beginTransaction();

        ft.replace(R.id.container_fragment_person_list, PersonDisplayFragment.newInstance("PERSON_DISPLAY_FRAGMENT", PersonController.getInstance().getLocalId(), PersonController.getInstance().getCurrentPerson()), "PERSON_DISPLAY_FRAGMENT");
        ft.addToBackStack(null);
        ft.commit();
        fm.executePendingTransactions();
    }

    private void refreshList() {
        new SimpleBackgroundTask<LazyList<Person>>(getActivity()) {

            @Override
            protected LazyList<Person> onRun() {
                return PersonModel.getInstance().lazyLoadPeople();
            }

            @Override
            protected void onSuccess(LazyList<Person> result) {
                personAdapter.replaceLazyList(result);
            }
        }.execute();
    }

    private void makeCreatePersonBackgroundTask(Person person) {
        jobManager.addJobInBackground(new CreatePersonJob(person));
        fm.popBackStack();
    }

    @Override
    public void onResume() {
        super.onResume();
        jobManager.addJobInBackground(new FetchPeopleJob());
        if(dataDirty) {
            refreshList();
            dataDirty = false;
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        FragmentTransaction ft;
        Person person = PersonController.getInstance().getCurrentPerson();
        ft = fm.beginTransaction();
        switch(item.getItemId()) {
            case R.id.action_new:
                ft.replace(R.id.container_fragment_person_list, PersonEditFragment.newInstance("PERSON_EDIT_FRAGMENT", (long) 0, new Person()), "PERSON_EDIT_FRAGMENT");
                ft.addToBackStack(null);
                ft.commit();
                fm.executePendingTransactions();
                return true;
            case R.id.action_edit:
                ft.replace(R.id.container_fragment_person_list, PersonEditFragment.newInstance("PERSON_EDIT_FRAGMENT", person.getId(), person), "PERSON_EDIT_FRAGMENT");
                ft.addToBackStack(null);
                ft.commit();
                fm.executePendingTransactions();
                return true;
            case R.id.action_remove:
                String title = MessageManager.getInstance().makeString(resources.getString(R.string.remove), " ", person.getName());
                String message = MessageManager.getInstance().makeString(resources.getString(R.string.message_confirm_remove), " ", person.getName(), resources.getString(R.string.punctuation_question));
                final InfoDialogFragment dialog = InfoDialogFragment.newInstance(title, message, DialogActionType.Delete, DialogActionTarget.Person, person.getId());
                dialog.show(ft, DIALOG_TAG);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

}

我很确定这是 android 绘制对象的方式的一些时间问题，但我不知道为什么它们在某些运行中正确绘制但在其他运行中不正确。

除非您确定其他地方已经就间歇性问题问过这个问题:-)

感谢任何帮助。

Answer 1

这是一个已知问题:Github issues什么时候updateBitmap()调用太早。
本期来自Bitmap.createBitmap()方法宽度或高度等于 0。
解决方法是更多地延迟 ShowcaseView 的创建:

someView.post(new Runnable() {
    @Override
    public void run() {
        // display ShowcaseView here
    }
});

如果 View 宽度或高度错误，您还可以更改库中的 updateBitmap() 方法以不创建位图。