我有一个使用自定义适配器的ListView。自定义适配器的getView使用所有推荐做法:
I have a ListView that uses a custom adapter. The custom adapter's getView uses all the recommended practices:
@Override
public View getView(int position, View convertView, ViewGroup parent) {
SuscriptionsViewsHolder holder;
ItemInRootList item = mItemsInList.get(position);
if (convertView == null) {
convertView = mInflater.inflate(R.layout.label, null);
holder = new SuscriptionsViewsHolder();
holder.label = (TextView) convertView.findViewById(R.id.label_label);
holder.icon = (ImageView) convertView.findViewById(R.id.label_icon);
convertView.setTag(holder);
} else {
holder = (SuscriptionsViewsHolder) convertView.getTag();
}
String text = String.format("%1$s (%2$s)", item.title, item.unreadCount);
holder.label.setText(text);
holder.icon.setImageResource(item.isLabel ? R.drawable.folder : R.drawable.file );
return convertView;
}
然而,当我滚动,这是因为沉重的垃圾回收不畅:
However when I scroll, it is sluggish because of heavy garbage collection:
GC_EXTERNAL_ALLOC freed 87K, 48% free 2873K/5447K, external 516K/519K, paused 30ms
GC_EXTERNAL_ALLOC freed 7K, 48% free 2866K/5447K, external 1056K/1208K, paused 29ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2866K/5447K, external 1416K/1568K, paused 28ms
GC_EXTERNAL_ALLOC freed 5K, 48% free 2865K/5447K, external 1600K/1748K, paused 27ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2865K/5447K, external 1780K/1932K, paused 30ms
GC_EXTERNAL_ALLOC freed 2K, 48% free 2870K/5447K, external 1780K/1932K, paused 26ms
GC_EXTERNAL_ALLOC freed 2K, 48% free 2870K/5447K, external 1780K/1932K, paused 25ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 26ms
GC_EXTERNAL_ALLOC freed 3K, 48% free 2870K/5447K, external 1780K/1932K, paused 25ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 29ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 29ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2871K/5447K, external 1780K/1932K, paused 28ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2871K/5447K, external 1780K/1932K, paused 26ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 27ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 29ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 26ms
GC_EXTERNAL_ALLOC freed <1K, 48% free 2870K/5447K, external 1780K/1932K, paused 34ms
什么似乎是错的?
What seems to be wrong?
编辑@ 12:47格林尼治标准时间:
EDIT @12:47 GMT:
在实际上它是稍微比这更复杂。我的应用程序的用户界面是基于两部分。一个是屏幕的大脑,创造了意见,处理用户输入等。另一种是片段
如果该设备具有的Android 3.0,否则它是一个活动
。
In fact it's slightly more complicated than this. My app UI is based on 2 parts. One is the brain of a screen, creating the views, handling user input, etc. The other is a Fragment
if the device has android 3.0, otherwise it's an Activity
.
GC的发生在我的Nexus One 2.3.3设备,因此,使用活动
。我没有我的Xoom和我一起测试用的行为片段
。
The GC happened on my Nexus One 2.3.3 device, so using the Activity
. I don't have my Xoom with me to test the behaviour with a Fragment
.
如果需要,我可以公布源,但让我试着解释一下:
I could post the source if required, but let me try to explain it :
RootList
是UI的大脑。它包含 :
在名单,其中;&GT;
将被放置在的ListView
项目
是建立此列表从一个SQLite数据库的方法
包含基本上只有getView方法上面粘贴一个自定义的BaseAdapter
RootList
is the brain of the UI. It contains :
a List<>
of items that will be placed in the ListView
.
a method that builds this list from a SQLite db
a custom BaseAdapter that contains basically only the getView method pasted above
在使用XML布局
布局当然有id为一个ListView android.id.list
在创建活动时,的活动
回调被转发到使用RootList实例的 RootList
类创建(构造函数,而不是的onCreate
)
在的onCreate
,我称之为 RootList
的方法,将创建的项目列表中,并设置列表数据到我的自定义类从 BaseAdapter
派生的新实例
uses an XML layout
the layout has of course a listview with id android.id.list
the Activity
callbacks are forwarded to the RootList
class using an instance of RootList created when the activity is created (constructor, not onCreate
)
in the onCreate
, I call RootList
's methods that will create the list of items, and set the list data to a new instance of my custom class derived from BaseAdapter
编辑于5月17日@下午9时36分格林尼治标准时间:
EDIT on may 17th @ 9:36PM GMT:
下面是活动的code和做的事情类。 http://pastebin.com/EgHKRr4r
Here's the code of the Activity and the class that does the things. http://pastebin.com/EgHKRr4r
我发现这个问题。该活动我的XML布局是:
I found the issue. My XML layout for the activity was:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<include android:id="@+id/rootlist_header" layout="@layout/pre_honeycomb_action_bar" />
<ListView android:id="@android:id/list"
android:layout_below="@id/rootlist_header"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:textColor="#444444"
android:divider="@drawable/list_divider"
android:dividerHeight="1px"
android:cacheColorHint="#00000000" />
</RelativeLayout>
如果我删除安卓cacheColorHint =#00000000
,重GC出来了,而滚动的的顺利的! :)
If I remove the android:cacheColorHint="#00000000"
, the heavy GC is out, and the scrolling is smooth! :)
我真的不知道为什么这个参数设置,因为我并不需要它。也许我copypasted太多,而不是真正建立我的XML布局。
I don't really know why this parameter was set, because I don't need it. Maybe I copypasted too much instead of actually build my XML layout.
感谢您的支持,我真的很美联社preciate你的帮助。
THANK YOU for your support, I really appreciate your help.