在长图像上设置动画屏幕

Question

我有一个非常长的图像，我需要屏幕从头到尾悬停在它上面。

有任何建议如何实现吗？

谢谢， 伊兰

Answer 1

如果您确定内存足以加载所需的位图，您只需在后台线程中加载位图，然后在可见的ImageViewer对象上显示位图的所需部分，这里是屏幕外位图处理的示例代码< / p>

            class BitmapWorkerTask extends AsyncTask<Integer, Void, Bitmap> {
                private final WeakReference<ImageView> imageViewReference;
                private int data = 0;

                public BitmapWorkerTask(ImageView imageView) {
                    // Use a WeakReference to ensure the ImageView can be garbage collected
                    imageViewReference = new WeakReference<ImageView>(imageView);
                }

                // Decode image in background.
                @Override
                protected Bitmap doInBackground(Integer... params) {
                    data = params[0];
                    return decodeSampledBitmapFromResource(getResources(), data, 100, 100));
                }

                // Once complete, see if ImageView is still around and set bitmap.
                @Override
                protected void onPostExecute(Bitmap bitmap) {
                    if (imageViewReference != null && bitmap != null) {
                        final ImageView imageView = imageViewReference.get();
                        if (imageView != null) {
                            imageView.setImageBitmap(bitmap);
                        }
                    }
                }
            }