如何使用ImageSwitcher中的Glide加载图像

Question

为了创建图像幻灯片放映,我想使用带有计时器的图像切换器.我看过这篇博文非常清楚但它不会从网络加载图片.现在我想从Glide Library加载网络图像.

这是MainActivity:

public class MainActivity extends Activity {
    private ImageSwitcher imageSwitcher;

    private int[] gallery = { http://www.helloworld.com/image1.png, http://www.helloworld.com/image2.png, http://www.helloworld.com/image3.png,
            http://www.helloworld.com/image4.png, };

    private int position;

    private static final Integer DURATION = 2500;

    private Timer timer = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageSwitcher = (ImageSwitcher) findViewById(R.id.imageSwitcher);
        imageSwitcher.setFactory(new ViewFactory() {

            public View makeView() {
                return new ImageView(MainActivity.this);
            }
        });

        // Set animations
        // https://danielme.com/2013/08/18/diseno-android-transiciones-entre-activities/
        Animation fadeIn = AnimationUtils.loadAnimation(this, R.anim.fade_in);
        Animation fadeOut = AnimationUtils.loadAnimation(this, R.anim.fade_out);
        imageSwitcher.setInAnimation(fadeIn);
        imageSwitcher.setOutAnimation(fadeOut);
    }

    // ////////////////////BUTTONS
    /**
     * starts or restarts the slider
     * 
     * @param button
     */
    public void start(View button) {
        if (timer != null) {
            timer.cancel();
        }
        position = 0;
        startSlider();
    }

    public void stop(View button) {
        if (timer != null) {
            timer.cancel();
            timer = null;
        }
    }

    public void startSlider() {
        timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {

            public void run() {
                // avoid exception:
                // "Only the original thread that created a view hierarchy can touch its views"
                runOnUiThread(new Runnable() {
                    public void run() {
                        imageSwitcher.setImageResource(gallery[position]);
                        position++;
                        if (position == gallery.length) {
                            position = 0;
                        }
                    }
                });
            }

        }, 0, DURATION);
    }

    // Stops the slider when the Activity is going into the background
    @Override
    protected void onPause() {
        super.onPause();
        if (timer != null) {
            timer.cancel();
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (timer != null) {
            startSlider();
        }

    }

}

我尝试用滑动加载图像,但我不知道该怎么办.

Answer 1

这是很容易做到,你只需要使用载入图片Glide的ImageView,你可以从获得ImageSwitcher的方法imageSwitcher.getCurrentView().因此,您需要将方法内run的 代码替换runOnUiThread为下一个代码:

Glide.with(MainActivity.this)
    .load(gallery[position])
    .asBitmap()
    .listener(new RequestListener<String, Bitmap>() {
        @Override
        public boolean onException(Exception e, String model, Target<Bitmap> target, boolean isFirstResource) {
            return false;
        }

        @Override
        public boolean onResourceReady(Bitmap resource, String model, Target<Bitmap> target, boolean isFromMemoryCache, boolean isFirstResource) {
            position++;
            if (position == gallery.length) {
                position = 0;
            }
            imageSwitcher.setImageDrawable(new BitmapDrawable(getResources(), resource));
            return true;
        }
    }).into((ImageView) imageSwitcher.getCurrentView());

另外,不要忘记用适当的网址替换你的图片网址(你现在有一些我看到的虚拟网址).所以你的gallery数组应该是一个String[]数组.

别忘了也包括android.permission.INTERNET你的AndroidManifest.xml.

最后,你需要改变android:layout_width你的财产ImageSwitcher,以match_parent在XML作为滑翔不会加载它,否则图像.