片段不被从存储器释放存储器、不被、片段
我有一个包含一种观点认为，有一个适配器FragmentStatePagerAdapter寻呼机的活动。 每一次进入活动会占用内存200MB，回去了活动（完成（））后，再重新进入它也将追加和加倍的内存使用在手机上。
I have an activity that contains a View Pager that has an adapter FragmentStatePagerAdapter. each time enter the activity it will take up 200mb of memory, after going back out of the activity(finish()) and then re entering it it will append and double the memory used on the phone.
解决的问题后，它好像片段管理器没有释放的片段，虽然我尝试将其删除，但它只是不工作。
After troubleshooting the problem it seems as if the fragment manager is not releasing the fragments although im trying to remove them but its just not working.
我试图清空已被添加，以确保它不是问题依旧片段里面的东西内部的片段。
I tried emptying the fragment that is being added to make sure its not something internal inside the fragment the the problem remains.
我的适配器code是
private class ChildrenPagerAdapter extends FragmentStatePagerAdapter
{
private List<ChildBean> childrenBean;
public ChildrenPagerAdapter(FragmentManager fm, List<ChildBean> bean)
{
super(fm);
this.childrenBean = bean;
}
@Override
public int getItemPosition(Object object)
{
return PagerAdapter.POSITION_NONE;
}
@Override
public Fragment getItem(int position)
{
ReportFragment reportFragment = new ReportFragment();
reportFragment.childBean = childrenBean.get(position);
reportFragment.position = position;
reportFragment.mPager = mPager;
if(position == 0)
{
reportFragment.mostLeft = true;
}
if(position == childrenNumber - 1)
{
reportFragment.mostRight = true;
}
return reportFragment;
}
@Override
public int getCount()
{
return childrenNumber;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object)
{
// TODO Auto-generated method stub
super.destroyItem(container, position, object);
}
}
我的活动code是
my activity code is
public class ReportActivity extends CustomActivity
{
public ImageLoader imageLoader;
private ViewPager mPager;
private PagerAdapter mPagerAdapter;
private int childrenNumber;
private int currentChild;
@Override
protected void onDestroy()
{
mPager.removeAllViews();
mPager.removeAllViewsInLayout();
mPager.destroyDrawingCache();
mPagerAdapter = null;
mPager = null;
System.gc();
super.onDestroy();
}
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setCustomTitle(string.title_activity_reports);
this.currentChild = getIntent().getIntExtra("itemselected", -1);
getSupportFragmentManager().
}
@Override
protected void onResume()
{
super.onResume();
mPager = (ViewPager) findViewById(R.id.vpchildren);
mPager.setOffscreenPageLimit(6);
childrenNumber = MainActivity.bean.size();
mPagerAdapter = new ChildrenPagerAdapter(getSupportFragmentManager(), MainActivity.bean);
mPager.setAdapter(mPagerAdapter);
mPager.setCurrentItem(currentChild);
}
}
片段code：
Fragment code :
public class ReportFragment extends Fragment
{
public ChildBean childBean;
public int position;
public ImageView img;
public ImageLoader imageLoader;
public DisplayImageOptions options;
private int pee = 0;
private int poop = 0;
private double sleep = 0.0;
public ViewPager mPager;
public boolean mostLeft = false;
public boolean mostRight = false;
public ReportFragment()
{
}
@Override
public void onDestroyView()
{
super.onDestroyView();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.report_fragment, container, false);
if(mostLeft)
{
rootView.findViewById(id.btnleft).setVisibility(View.GONE);
}
if(mostRight)
{
rootView.findViewById(id.btnright).setVisibility(View.GONE);
}
rootView.findViewById(id.btnleft).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
mPager.setCurrentItem(mPager.getCurrentItem() - 1);
}
});
rootView.findViewById(id.btnright).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
mPager.setCurrentItem(mPager.getCurrentItem() + 1);
}
});
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy", Locale.ENGLISH);
Date dobchild = new Date();
((TextView) rootView.findViewById(id.tvday)).setText(sdf.format(dobchild));
ImageView childimg = (ImageView) rootView.findViewById(id.img_child);
((TextView) rootView.findViewById(id.tvchildname)).setText(childBean.childname);
((TextView) rootView.findViewById(id.tvclassname)).setText(((CustomApplication) getActivity().getApplication()).preferenceAccess.getCurrentClassName());
Date dob = null;
String age = "";
try
{
dob = sdf.parse(childBean.childdob);
age = GeneralUtils.getAge(dob.getTime(), getString(string.tv_day), getString(string.tv_month), getString(string.tv_year));
}
catch(ParseException e)
{
// TODO:
}
((CustomTextView) rootView.findViewById(id.tvchildage)).setText(age);
DisplayImageOptions options =
new DisplayImageOptions.Builder().showImageForEmptyUri(drawable.noimage).showImageOnFail(drawable.noimage).showStubImage(drawable.noimage).cacheInMemory()
.imageScaleType(ImageScaleType.NONE).build();
imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(childBean.childphoto, childimg, options);
final TextView tvpee = (TextView) rootView.findViewById(id.tvpeetime);
final TextView tvpoop = (TextView) rootView.findViewById(id.tvpootimes);
final TextView tvsleep = (TextView) rootView.findViewById(id.tvsleeptime);
rootView.findViewById(id.btnaddpee).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
pee = pee + 1;
if(pee > 9)
{
Toast.makeText(getActivity(), getString(string.tvareyousurepee), Toast.LENGTH_LONG).show();
}
tvpee.setText(String.format(getString(string.tvtimes), pee));
}
});
rootView.findViewById(id.btnminuspee).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
if(pee > 0)
{
pee = pee - 1;
tvpee.setText(String.format(getString(string.tvtimes), pee));
}
}
});
rootView.findViewById(id.btnpluspoo).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
poop = poop + 1;
if(poop > 9)
{
Toast.makeText(getActivity(), getString(string.tvareyousurepoop), Toast.LENGTH_LONG).show();
}
tvpoop.setText(String.format(getString(string.tvtimes), poop));
}
});
rootView.findViewById(id.btnminuspoo).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
if(poop > 0)
{
poop = poop - 1;
tvpoop.setText(String.format(getString(string.tvtimes), poop));
}
}
});
rootView.findViewById(id.btnaddsleep).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
sleep = sleep + 0.25;
tvsleep.setText(String.format(getString(string.tvhours), sleep));
}
});
rootView.findViewById(id.btnminussleep).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
if(sleep > 0)
{
sleep = sleep - 0.25;
tvsleep.setText(String.format(getString(string.tvhours), sleep));
}
}
});
rootView.findViewById(id.btnsave).setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v)
{
Toast.makeText(getActivity(), "Report Saved.", Toast.LENGTH_LONG).show();
getActivity().finish();
}
});
return rootView;
}
}
请指教...谢谢
推荐答案
ViewPager本身有一个方法 setOffscreenPageLimit ，它允许你指定保存的适配器页数。所以，你的碎片过远将被销毁。
ViewPager itself has a method setOffscreenPageLimit which allows you to specify number of pages kept by the adapter. So your fragments that are far away will be destroyed.
首先看你的code我不知道你在做任何内存释放措施，在片段的onDestroy（）。该片段本身被破坏，gc'ed，但这并不意味着你分配被拆除过的所有资源。
First of all looking at your code I don't see you doing any memory releasing measures in your fragments onDestroy(). The fact that fragment itself is destroyed and gc'ed does not mean all resources you allocated were removed too.
例如，我最大的担忧是：
For example, my big concern is:
imageLoader = ImageLoader.getInstance();
imageLoader.displayImage(childBean.childphoto, childimg, options);
这是我所看到的在这里似乎有ImageLoader的一个静态实例被捅了一个新的片断每次出现，但我不能看到一个垂死的片段会问ImageLoader的卸载它的东西。这看起来可疑的我。
From what I see here it seems that there is a static instance of ImageLoader that gets poked every time a new fragment appears, but I can't see where a dying fragment would ask ImageLoader to unload its stuff. That looks suspicious to me.
如果我是你，我会倾我的活动启动后的应用程序花了额外的200MB（你索赔）的那一刻的HPROF文件，并通过分析MAT引用（内存分析工具）。你显然有内存泄漏问题，我很怀疑问题出在片段本身没有遭到破坏。
If I were you I would dump an HPROF file of my application the moment it took extra 200mb (as you claim) after activity restart and analyze references via MAT (memory analyzer tool). You are clearly having memory leaks issue and I highly doubt the problem is in Fragments themselves not being destroyed.
如果你不知道如何分析内存堆，这里是一个很好的影片。我不能指望有多少次它帮助我识别和我的应用程序摆脱了内存泄漏。
In case you don't know how to analyze memory heap, here is a good video. I can't count how many times it helped me identifying and getting rid of memory leaks in my apps.
