Question

我有一个运行良好的ViewPager，但内存泄漏。
我试图通过堆分析和Eclipse内存分析器找到泄漏事实证明，我有几个ViewPager实例，并且在几次活动重新创建后没有在堆中发布Bitmaps 我的代码中的泄漏原因在哪里？

这是Fragment，我在一段时间后使用ViewPager并滚动项目：

    private final int INTERVAL_TIME = 15000;
    private ViewPager mViewPager;
    private ViewPagerAdapter mAdapter;
    private Handler mHandler;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_bottom, container, false);
       ......

        mViewPager = (ViewPager) view.findViewById(R.id.pager);
        mAdapter = new ViewPagerAdapter(getActivity(), bottomItems);
        mViewPager.setAdapter(mAdapter);

        mHandler = new Handler();
        mHandler.postDelayed(UpdateTimeThread, INTERVAL_TIME);
        return view;
    }

    private Runnable UpdateTimeThread = new Runnable() {
        @Override
        public void run() {
            int position;
            if (mViewPager.getCurrentItem() == mViewPager.getAdapter().getCount() - 1) {
                position = 0;
            } else {
                position = mViewPager.getCurrentItem() + 1;
            }
            mViewPager.setCurrentItem(position, true);
            mHandler.postDelayed(this, INTERVAL_TIME);

        }
    };

这是我的PagerAdapter，它可以在屏幕上同时显示3个项目（如果他们的format.equals（＆＃34; 1＆＃34;））或一次显示2个项目，以防其中一个是双倍大小（格式） .equals（＆＃34; 2＆＃34;））

public class ViewPagerAdapter extends PagerAdapter {
private final List<JsonParsed.BottomItem> bottomItems;
private Activity activity;

public ViewPagerAdapter(Activity activity, List<JsonParsed.BottomItem> bottomItems) {
    this.activity = activity;
    this.bottomItems = bottomItems;
}

@Override
public int getCount() {
    if (bottomItems.size() < 3) {
        return 1;
    }
    return (int) Math.floor((float) bottomItems.size() / 3f);
}

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

@Override
public Object instantiateItem(ViewGroup container, final int position) {
    LayoutInflater inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View itemView = inflater.inflate(R.layout.pager_item, container, false);
    ImageView pic = (ImageView) itemView.findViewById(R.id.image_item);
    ImageView pic2 = (ImageView) itemView.findViewById(R.id.image_item2);
    ImageView pic3 = (ImageView) itemView.findViewById(R.id.image_item3);
    pic.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            click(bottomItems.get(position * 3));
        }
    });
    pic2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            click(bottomItems.get(position * 3 + 1));
        }
    });

    pic3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            click(bottomItems.get(position * 3 + 2));
        }
    });
    if (bottomItems.get(position * 3) != null) {
        pic.setImageBitmap(BitmapFactory.decodeFile(bottomItems.get(position * 3).getPrev(activity).getAbsolutePath()));
        if (bottomItems.get(position * 3).format.equals("1")) {
            pic.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 2f));
        } else if (bottomItems.get(position * 3).format.equals("2")) {
            pic.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1f));
        }
    } else {
        pic.setVisibility(View.GONE);
    }

    if (bottomItems.size() > position * 3 + 1 && bottomItems.get(position * 3 + 1) != null) {
        pic2.setImageBitmap(BitmapFactory.decodeFile(bottomItems.get(position * 3 + 1).getPrev(activity).getAbsolutePath()));
        if (bottomItems.get(position * 3 + 1).format.equals("1")) {
            pic2.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 2f));
        } else if (bottomItems.get(position * 3 + 1).format.equals("2")) {
            pic2.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1f));
        }
    } else {
        pic2.setVisibility(View.GONE);
    }
    if (bottomItems.size() > position * 3 + 2 && bottomItems.get(position * 3 + 2) != null) {
        pic3.setImageBitmap(BitmapFactory.decodeFile(bottomItems.get(position * 3 + 2).getPrev(activity).getAbsolutePath()));
        if (bottomItems.get(position * 3 + 2).format.equals("1")) {
            pic3.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 2f));
        } else if (bottomItems.get(position * 3 + 2).format.equals("2")) {
            pic3.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT, 1f));
        }
    } else {
        pic3.setVisibility(View.GONE);
    }

    container.addView(itemView);

    return itemView;
}

private void click(JsonParsed.BottomItem bottomItem) {
    if (bottomItem.url != null && !bottomItem.url.isEmpty()) {
        ((MainActivity) activity).showWebView(bottomItem.url);
    } else if (bottomItem.video != null && !bottomItem.video.isEmpty()) {
        ((MainActivity) activity).onPlayMedia(bottomItem.getVideo(activity).getAbsolutePath(), bottomItem.id, false);
    }
}

@Override
public void destroyItem(ViewGroup container, int position, Object view) {
    container.removeView((LinearLayout) view);
}

非常感谢任何建议

修改
最后解决了泄漏问题正如Egor所指出的那样，主要的泄漏是由Handler引起的因为它将引用保留在ViewPager实例上，所以实例不会被垃圾收集最后我只使用了懒惰的解决方案 - WeakHandler（开源库）我想它也是如此，正如Egors的文章所述但是使用它非常方便，因为你只是像往常一样使用Handler：
WeakHandler（）。postDelayed（....）就是这样。
我还使用了Bitmaps的周引用，所有内存泄漏都消失了

Answer 1

Handler很可能是导致内存泄漏的问题。有一个wonderful article详细描述了这个问题，建议您使用WeakReference来解决问题。

ViewPager内存泄漏

1 个答案: