我的活动只是在地图（谷歌android v2 api）和图像之间切换。我使用MapFragment。 出于某种原因，即使我尝试做map.clear（），它仍然保留在内存中。 您可以看到，每次显示地图时，我在内存映射中都有一个新的maps.z.a实例。 怎么清楚这些？我也试过手动运行System.gc（）。
Class Name | Shallow Heap | Retained Heap | Percentage
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| | |
class android.content.res.Resources @ 0x41267910 System Class| 40 | 8,526,400 | 39.29%
android.graphics.Bitmap @ 0x421b0620 | 48 | 5,760,064 | 26.54%
android.graphics.Bitmap @ 0x415a33e0 | 48 | 1,127,600 | 5.20%
maps.as.aw @ 0x434a6750 | 160 | 278,072 | 1.28%
maps.p.c @ 0x421b4110 | 32 | 211,040 | 0.97%
maps.z.a @ 0x4218f698 | 152 | 205,864 | 0.95%
maps.z.a @ 0x421f69a8 | 152 | 205,256 | 0.95%
maps.z.a @ 0x4222f5c8 | 152 | 205,256 | 0.95%
maps.z.a @ 0x4366fb20 | 152 | 205,256 | 0.95%
android.graphics.Bitmap @ 0x41feb6e0 | 48 | 160,064 | 0.74%
java.util.zip.ZipFile @ 0x42155b40 | 32 | 139,704 | 0.64%
maps.as.q @ 0x41f35e30 | 80 | 131,536 | 0.61%
maps.as.q @ 0x421dcad8 | 80 | 131,536 | 0.61%
maps.as.q @ 0x434e7d90 | 80 | 131,536 | 0.61%
maps.as.q @ 0x435ccc40 | 80 | 131,536 | 0.61%
maps.as.aw @ 0x420c5e90 | 160 | 127,944 | 0.59%
class android.text.Html$HtmlParser @ 0x41e18f98 System Class | 8 | 126,632 | 0.58%
maps.as.aw @ 0x435bc4e0 | 160 | 111,624 | 0.51%
android.graphics.Bitmap @ 0x415e6708 | 48 | 100,304 | 0.46%
class libcore.icu.TimeZones @ 0x4123d1e8 System Class | 40 | 90,080 | 0.42%
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代码段：
添加到视图
frag = MapFragment.newInstance(); // Add the MapFragment to the view FragmentTransaction ft = ((Activity) context).getFragmentManager().beginTransaction(); ft.add(this.getId(), frag).commit();
从视图中删除
FragmentTransaction ft = ((Activity) context).getFragmentManager().beginTransaction(); ft.remove(frag).commit();