图像轮播定时器 Android

Question

I have created an Image carousel for my app. Actually, for try, it includes 5 banners.

I would insert timer to switch the banner automatically but I don't find the correct way.

This is my MainActivity file with the slide code:

viewPager = findViewById(R.id.viewPagerId);
    mList = new ArrayList<>();
    mList.add(new ModalClass(R.drawable.banner_eeee , "Title"));
    mList.add(new ModalClass(R.drawable.banner_gggg , "Title"));
    mList.add(new ModalClass(R.drawable.banner_ffff , "Title"));
    mList.add(new ModalClass(R.drawable.banner_gggg , "Title"));
    mList.add(new ModalClass(R.drawable.banner_eeee , "Title"));

    SlideHomepageAdapter slideHomepageAdapter = new SlideHomepageAdapter(this, mList);
    viewPager.setAdapter(slideHomepageAdapter);

Could you help me?

Thanks for your answer.

Answer 1

You can use a ScheduledExecutorService for this:

ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
executor.scheduleAtFixedRate(updateToNextImage, 0, 3000, TimeUnit.MILLISECONDS);

The updateToNextImage Runnable should handle the switching of images. Something like this:

Runnable updateToNextImage = new Runnable() {
    @Override
    public void run() {
        runOnUiThread(
            new Runnable() {
                @Override
                public void run() {
                    // Modify ui on the main thread
                    viewPager.setCurrentItem(currentImageIndex++ % imageCount, true);
                }
            }
        );
    }
};

Don't forget to close it when you're done with it:

executor.shutdown();

Answer 2

Ok, then the code should to be:

    viewPager = findViewById(R.id.viewPagerId);
    mList = new ArrayList<>();
    mList.add(new ModalClass(R.drawable.banner_eeee , "Title"));
    mList.add(new ModalClass(R.drawable.banner_gggg , "Title"));
    mList.add(new ModalClass(R.drawable.banner_ffff , "Title"));
    mList.add(new ModalClass(R.drawable.banner_gggg , "Title"));
    mList.add(new ModalClass(R.drawable.banner_eeee , "Title"));

    SlideHomepageAdapter slideHomepageAdapter = new SlideHomepageAdapter(this, mList);
    viewPager.setAdapter(slideHomepageAdapter);

    ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
    executor.scheduleAtFixedRate(updateToNextImage, 0, 3000, TimeUnit.MILLISECONDS);

    Runnable updateToNextImage = new Runnable() {
    @Override
    public void run() {
        runOnUiThread(
            new Runnable() {
                @Override
                public void run() {
                    // Modify ui on the main thread
                    viewPager.setCurrentItem(currentImageIndex++ % imageCount, true);
                }
            }
        );
    }
};

executor.shutdown();

Sorry but I am new for that.