在我的片段android代码上找不到泄漏

问题描述

我有一个TabLayout，在每个选项卡下都有一个Fragment(我正在使用ArrayPagerAdapter).我注意到，当我从一个选项卡多次切换到另一个选项卡时，我的内存使用量增加了很多.从我的堆快照中，我可以看到有很多AutoCompleteTextView实例.

I have a TabLayout, under each tab there is a Fragment (I'm using ArrayPagerAdapter). I've noticed that when I switch many times from a tab to another, my memory usage increase a lot. From my heap snapshot, I can see there are a lot of AutoCompleteTextView instances.

因此，我确信问题可能出在这里:

So I am convinced that the problem could be here:

public class MyFragment  {
...
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    ...
    final MultiAutoCompleteTextView eInput = (MultiAutoCompleteTextView) v.findViewById(R.id.TextInput);
    EditorListener mEditorListener = new EditorListener();
    eInput.setOnEditorActionListener(mEditorListener);
    eInput.addTextChangedListener(new WhitespaceWatcher());
    eInput.setAdapter(mDictionaryAdapter);
    eInput.setTokenizer(new SpaceTokenizer());
    ...
  }
...
  class EditorListener implements TextView.OnEditorActionListener
  {
  @Override
  public boolean onEditorAction(TextView textView, int actionId, KeyEvent keyEvent) {
    ...
    MultiAutoCompleteTextView input = (MultiAutoCompleteTextView) textView.findViewById(R.id.TextInput);
    ...
  }
}
...
}

但是我不明白问题出在哪里.

But I can't understand where exactly the problem is.

推荐答案

对其他人的注意:张贴者和我就此问题进行了非官方的讨论，张贴者创建了能够重现此问题的示例应用程序.

Note to others: the poster and I had an off-SO discussion about this issue, and the poster created this sample app that was able to reproduce the problem.

经过一番挣扎，我得以使 LeakCanary 正常工作.与运输1.3.1相比，它需要1.4-beta1.我需要做的就是添加依赖项，并根据LeakCanary文档设置一个Application子类.然后，启动应用程序，并在活动出现后按BACK.

After some struggling, I was able to get LeakCanary to work. It required 1.4-beta1 versus the shipping 1.3.1. All I needed to do was add the dependencies and set up an Application subclass per the LeakCanary docs. Then, launch the app and press BACK once the activity appears.

您得到:

这是框架错误还是appcompat-v7及其特定子类MultiAutoCompleteTextView引入的某些内容，我目前不能说.但是，这绝对不是代码中的错误.

Whether this is a framework bug or something introduced by appcompat-v7 and its specific subclass of MultiAutoCompleteTextView, I can't say at present. However, it is definitely not a bug in your code.

从片段的onDestroyView()中的MultiAutoCompleteTextView(setAdapter(null))清除适配器应防止其泄漏活动，但是小部件本身仍会泄漏.快速浏览相关代码并没有给我太多希望，无需修改框架(对于MultiAutoCompleteTextView)或appcompat-v7(对于其子类)，就可以解决泄漏本身.

Clearing the adapter from the MultiAutoCompleteTextView (setAdapter(null)) in onDestroyView() of the fragment should prevent it from leaking the activity, but the widget itself will still leak. A quick scan of the relevant code does not give me much hope that the leak itself can be fixed without modifications to either the framework (for MultiAutoCompleteTextView) or appcompat-v7 (for its subclass).

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