Question

我是Android新手，我正在尝试实施ViewPager进行图片浏览。我正在使用一个名为UrlImageViewHelper的库来加载来自URL字符串的图像。滚动浏览前4-5张图像后，我遇到内存泄漏问题。

以下是我正在使用的页面适配器代码：

private class ImagePagerAdapter extends PagerAdapter {

    private ArrayList<String> images = new ArrayList<String>();
    private LayoutInflater inflater;

    ImagePagerAdapter(ArrayList<String> imageUrls) {
        this.images = imageUrls;
        inflater = getLayoutInflater();
    }

    @Override
    public void destroyItem(ViewGroup container, int position ,Object object) {
        ((ViewPager) container).removeView((View) object);

    }

    @Override
    public int getCount() {
        return images.size();
    }

    @Override
    public Object instantiateItem(ViewGroup view, int position) {
        View imageLayout = inflater.inflate(R.layout.activity_imagedetailitem, view, false);
        ImageView imageView = (ImageView) imageLayout.findViewById(R.id.detailImage);

        UrlImageViewHelper.setUrlDrawable(imageView, imageUrls.get(position));

        ((ViewPager) view).addView(imageLayout, 0);
        return imageLayout;

    }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view.equals(object);
        }

       @Override  
       public void finishUpdate(View arg0) {}  

       @Override  
       public void restoreState(Parcelable arg0, ClassLoader arg1) {}  

       @Override  
       public Parcelable saveState() {  
           return null;  
       }  

       @Override  
       public void startUpdate(View arg0) {}  

     }  //end of page adapter

非常基本的代码，但必须有一些我缺少的东西？如果我能提供更多信息，请告诉我。谢谢大家。

UrlImageViewHelper库中的代码：

/**
 * Download and shrink an Image located at a specified URL, and display it
 * in the provided {@link ImageView} once it finishes loading.
 *
 * @param imageView The {@link ImageView} to display the image to after it
 *            is loaded.
 * @param url The URL of the image that should be loaded.
 */
public static void setUrlDrawable(final ImageView imageView, final String url) {
    setUrlDrawable(imageView.getContext(), imageView, url, null, CACHE_DURATION_THREE_DAYS, null);
}

以下是LogCat抛出的异常：

04-02 09:53:08.975: E/AndroidRuntime(23001): FATAL EXCEPTION: AsyncTask #2
04-02 09:53:08.975: E/AndroidRuntime(23001): java.lang.RuntimeException: An error occured while executing doInBackground()
04-02 09:53:08.975: E/AndroidRuntime(23001):    at android.os.AsyncTask$3.done(AsyncTask.java:200)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.lang.Thread.run(Thread.java:1027)
04-02 09:53:08.975: E/AndroidRuntime(23001): Caused by: java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=6983KB, Allocated=3582KB, Bitmap Size=25132KB)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:694)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at com.koushikdutta.urlimageviewhelper.UrlImageViewHelper.loadBitmapFromStream(UrlImageViewHelper.java:117)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at com.koushikdutta.urlimageviewhelper.UrlImageViewHelper.access$3(UrlImageViewHelper.java:94)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at com.koushikdutta.urlimageviewhelper.UrlImageViewHelper$1.onDownloadComplete(UrlImageViewHelper.java:589)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at com.koushikdutta.urlimageviewhelper.UrlImageViewHelper$3.doInBackground(UrlImageViewHelper.java:655)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at com.koushikdutta.urlimageviewhelper.UrlImageViewHelper$3.doInBackground(UrlImageViewHelper.java:1)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at android.os.AsyncTask$2.call(AsyncTask.java:185)
04-02 09:53:08.975: E/AndroidRuntime(23001):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
04-02 09:53:08.975: E/AndroidRuntime(23001):    ... 4 more

感谢您的光临。

Answer 1

只需覆盖此方法......

@Override
public void destroyItem(View collection, int position, Object view) {
    ((ViewPager) collection).removeView((View) view);
    collection = null;
}

Answer 2

java.lang.OutOfMemoryError: bitmap size exceeds VM budget(Heap Size=6983KB, Allocated=3582KB, Bitmap Size=25132KB)

我会重新考虑你在做什么，因为基本上25MB的位图与你可以使用的字节数相比不会加载。

使用图像ViewPager时出现“Out of Memory”错误

2 个答案: