java - 如何停止 slider 上的无限循环

Question

我正在使用 this Slider .

这是我的代码:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDemoSlider = (SliderLayout)findViewById(R.id.slider);

        HashMap<String,Integer> file_maps = new HashMap<String, Integer>();
        file_maps.put("Hannibal",R.drawable.hannibal);
        file_maps.put("Big Bang Theory",R.drawable.bigbang);
        file_maps.put("House of Cards",R.drawable.house);
        file_maps.put("Game of Thrones", R.drawable.game_of_thrones);

        for(String name : file_maps.keySet()){
            TextSliderView textSliderView = new TextSliderView(this);
            // initialize a SliderLayout
            textSliderView
                    .description(name)
                    .image(file_maps.get(name))
                    .setScaleType(BaseSliderView.ScaleType.Fit)
                    .setOnSliderClickListener(this);

            //add your extra information
            textSliderView.bundle(new Bundle());
            textSliderView.getBundle()
                        .putString("extra",name);

           mDemoSlider.addSlider(textSliderView);
        }
        mDemoSlider.setPresetTransformer(SliderLayout.Transformer.Accordion);
        mDemoSlider.setPresetIndicator(SliderLayout.PresetIndicators.Center_Bottom);
        mDemoSlider.setCustomAnimation(new DescriptionAnimation());
        mDemoSlider.stopAutoCycle();
        mDemoSlider.addOnPageChangeListener(this);
    }

有什么方法可以阻止 slider 上的无限循环。我读到我应该添加 mDemoSlider.stopAutoCycle(); 但这没有任何效果。

Answer 1

抱歉，您不能。至少没有这个库。

我查看了代码，发现这种“无限滚动”是默认行为，如果你想禁用它，你要么实现自己的 slider ，要么为原作者提供建议和编辑...

“问题”出在 SliderLayout.java 类的这两个方法上:

/**
 * move to next slide.
 */
public void moveNextPosition(boolean smooth) {

    if (getRealAdapter() == null)
        throw new IllegalStateException("You did not set a slider adapter");

    mViewPager.setCurrentItem(mViewPager.getCurrentItem() + 1, smooth);
}

// ...

/**
 * move to prev slide.
 */
public void movePrevPosition(boolean smooth) {

    if (getRealAdapter() == null)
        throw new IllegalStateException("You did not set a slider adapter");

    mViewPager.setCurrentItem(mViewPager.getCurrentItem() - 1, smooth);
}

并且 setCurrentItem 位于 ViewPagerEx.java 类中，您可以在其中看到这种无限滚动是默认行为。 (查看 setCurrentItemInternal 方法)。

 void setCurrentItemInternal(int item, boolean smoothScroll, boolean always, int velocity) {
        if (mAdapter == null || mAdapter.getCount() <= 0) {
            setScrollingCacheEnabled(false);
            return;
        }
        if (!always && mCurItem == item && mItems.size() != 0) {
            setScrollingCacheEnabled(false);
            return;
        }

        if (item < 0) {
            item = 0;
        } else if (item >= mAdapter.getCount()) {
            item = mAdapter.getCount() - 1;
        }
        final int pageLimit = mOffscreenPageLimit;
        if (item > (mCurItem + pageLimit) || item < (mCurItem - pageLimit)) {
            // We are doing a jump by more than one page.  To avoid
            // glitches, we want to keep all current pages in the view
            // until the scroll ends.
            for (int i=0; i<mItems.size(); i++) {
                mItems.get(i).scrolling = true;
            }
        }
        final boolean dispatchSelected = mCurItem != item;

        if (mFirstLayout) {
            // We don't have any idea how big we are yet and shouldn't have any pages either.
            // Just set things up and let the pending layout handle things.
            mCurItem = item;
            triggerOnPageChangeEvent(item);
            requestLayout();
        } else {
            populate(item);
            scrollToItem(item, smoothScroll, velocity, dispatchSelected);
        }
    }