递归方式不显示Android ShowcaseView

Question

开门见山吧。我正在尝试使用amlcurran的ShowcaseView库来展示coachmark系列：https://github.com/amlcurran/ShowcaseView

我看不到马车标记了。问题是runCoachMark()方法总是返回null。runCoachMark()方法在mMainAdapter上紧跟在notifyDatasetChaned()之后运行。

我尝试过使用Handler()、.postDelayed()和Thread.sleep()，但都没有成功。

任何人都可以解释为什么会发生这种情况，以及这个问题的一些解决方案。谢谢。

private static final int COACHMARK_A = -3;
private static final int COACHMARK_B = -2;
private static final int COACHMARK_C = -1;
// ... some other coachmark type

private static final int END_COACHMARK = 0;

private static final int SCROLL_OFFSET = 56;
private static final long COACHMARK_DELAY = 200L;

private void runCoachMark(int type) {
        if (type == END_COACHMARK) {
            return;
        }
        View v = getCoachMarkView(type);
        if (v == null) {
            return;
        }
    showCoachMark(getActivity(), v, type);
}

@Nullable
private View getCoachMarkView(final int type) {
    safeScrollTo(getPos(type), SCROLL_OFFSET);

    return mMainList.getChildAt(0).findViewById(getCoachMarkId(type));
}

private void safeScrollTo(final int pos, final int offset) {
        mMainList.setLayoutFrozen(true);
        mLayoutManager.scrollToPositionWithOffset(pos, offset);
        mMainList.setLayoutFrozen(false);
}

private int getCoachMarkId(int type) {
    int id;
    switch (type) {
        case COACHMARK_A:
            id = R.id.A;
            break;
        case COACHMARK_B:
            id = R.id.B;
            break;
        case COACHMARK_C:
            id = R.id.C;
            break;
        // ... some other types
        default:
            id = 0;
            break;
    return id;
}

private int getPos(int type) {
        int pos;
        switch (type) {
            case COACHMARK_A:
                pos = 1;
                break;
            case COACHMARK_B:
                pos = 4;
                break;
            case COACHMARK_C:
                pos = 5;
                break;
// ... some other cases
            default:
                pos = 0;
                break;
        }
        return pos;
}

private void showCoachMark(final Context context, final View v, final int type) {
        new ShowcaseView.Builder(getActivity())
                        .setTarget(new ViewTarget(v.getId(), (Activity) context))
                        .setContentTitle(getTitle(type))
                        .setContentText(getDescription(type))
                        .setShowcaseDrawer(new CustomShowcaseView(v))
                        .setShowcaseEventListener(new OnShowcaseEventListener() {
                            @Override
                            public void onShowcaseViewHide(ShowcaseView showcaseView) {

                            }

                            @Override
                            public void onShowcaseViewDidHide(ShowcaseView showcaseView) {
                                new Handler().postDelayed(new Runnable() {
                                    @Override
                                    public void run() {
                                        runCoachMark(type++);
                                    }
                                }, COACHMARK_DELAY);
                            }

                            @Override
                            public void onShowcaseViewShow(ShowcaseView showcaseView) {

                            }

                            @Override
                            public void onShowcaseViewTouchBlocked(MotionEvent motionEvent) {

                            }
                        })
                        .build();
            }
}

Answer 1

我将与您分享一种使用递归方法动态使用showcaseview的新方法

1)创建您的目标，例如4个ViewTargets (您可以创建n个目标)，并将目标放入Activity类中声明为私有属性的数组中:私有ViewTarget[]目标；

    final ViewTarget target1 = new ViewTarget(textview1);
    final ViewTarget target2 = new ViewTarget(textview2);
    final ViewTarget target3 = new ViewTarget(textview3);
    final ViewTarget target4 = new ViewTarget(textview4);
    targets = new ViewTarget[] { target1, target2,target3,target4};

2)创建递归方法：

private void toStep(final String title, final String description,Target target, final int i) {
        final ShowcaseView.Builder showCaseBuilder = new ShowcaseView.Builder(ShowCaseActivity.this);
        showCaseBuilder.setTarget(targets[i]);
        showCaseBuilder.setContentTitle(title.replace("[i]", ""+i));
        showCaseBuilder.setContentText(description.replace("[i]", ""+i));
        showCaseBuilder.setShowcaseEventListener(new OnShowcaseEventListener() {
            @Override
            public void onShowcaseViewTouchBlocked(MotionEvent motionEvent) {
            }

            @Override
            public void onShowcaseViewShow(ShowcaseView showcaseView) {
            }

            @Override
            public void onShowcaseViewHide(ShowcaseView showcaseView) {
                try {
                    toStep(title, description, targets[i+1], i+1);
                } catch(Exception ex) {

                }
            }
            @Override
            public void onShowcaseViewDidHide(ShowcaseView showcaseView) {
            }
        });
        showCaseBuilder.build();
    }

3)最后，您可以调用显示Showcase的方法：

toStep("Title for showcase [i]", " Description for showcase [i] ",targets[0], 0);

我希望这将对您有所帮助:)