仅加载我的位置周围的标记Google Map v2 Android [英] Load only markers surrounding my location Google Map v2 Android
问题描述
我在Android的Google Map v2中加载了很多标记(1700或更多).我想减少创建此映射所用的内存量，因为它似乎是我的2.3 Droid FC.我只想添加点，只要它们在可见的屏幕区域内即可.
I have a lot of markers (1700 or more) loading on a Google Map v2 in Android. I would like to cut down on the amount of memory being used creating this map as it seems to be FC my 2.3 Droid. I would like to add points only if they are within the visible screen area.
我看过Google Maps Extension，看到了:
I have looked at the Google Maps Extension and see this:
map.setClustering(new ClusteringSettings().enabled(false).addMarkersDynamically(true));
但是我的for循环会将所有标记添加到地图.如何设置此方法，并仅按此方法添加我的标记?
However my for loop adds all the markers to the map. How do I set this up and only add my markers per this method?
这是我的for循环添加标记:
Here is my for loop adding markers:
int nsize = visibleMarkers.size();
for (int i = 0; i < nsize; i++) {
MapMarkers marks = new MapMarkers();
String title = visibleMarkers.valueAt(i).getTitle();
String desc = visibleMarkers.valueAt(i).getDesc();
Float latitude = visibleMarkers.valueAt(i).getLat();
Float longitude = visibleMarkers.valueAt(i).getLon();
m = map.addMarker(new MarkerOptions()
.position(new LatLng(latitude, longitude))
.title(title)
.icon(BitmapDescriptorFactory
.fromResource(R.drawable.snotel_marker)));
marks.setTitle(title);
marks.setDesc(desc);
markerInfo.put(m, marks);
map.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {
@Override
public void onInfoWindowClick(Marker marker) {
MapMarkers markInfo = markerInfo.get(marker);
Intent i = new Intent(MainActivity.this,
MarkerInformation.class);
i.putExtra("name", markInfo.getTitle()).putExtra(
"description", markInfo.getDesc());
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);
}
});
}
仅在显示屏幕区域时，如何添加它们.这会减少我设备上的资源使用吗?
How do I add them only when the area in the screen is shown. Will this cut down on resources use on my device?
::这是logcat问题
:: Here is logcat issues
10-01 10:59:41.590: D/dalvikvm(6488): GC_FOR_MALLOC freed <1K, 55% free 10009K/21895K, external 2433K/2688K, paused 94ms
10-01 10:59:41.691: D/dalvikvm(6488): GC_FOR_MALLOC freed 128K, 55% free 9913K/21895K, external 2433K/2688K, paused 72ms
10-01 10:59:41.793: D/dalvikvm(6488): GC_FOR_MALLOC freed 62K, 55% free 9973K/21895K, external 2433K/2688K, paused 83ms
10-01 10:59:41.910: D/dalvikvm(6488): GC_FOR_MALLOC freed 65K, 55% free 10026K/21895K, external 2433K/2688K, paused 74ms
10-01 10:59:41.988: D/dalvikvm(6488): GC_FOR_MALLOC freed 0K, 54% free 10085K/21895K, external 2433K/2688K, paused 72ms
10-01 10:59:41.988: I/dalvikvm-heap(6488): Grow heap (frag case) to 14.703MB for 60434-byte allocation
10-01 10:59:42.082: D/dalvikvm(6488): GC_FOR_MALLOC freed 0K, 54% free 10144K/21959K, external 2433K/2688K, paused 82ms
10-01 10:59:42.199: D/dalvikvm(6488): GC_FOR_MALLOC freed 138K, 55% free 10043K/21959K, external 2433K/2688K, paused 82ms
10-01 10:59:42.207: I/dalvikvm-heap(6488): Grow heap (frag case) to 14.762MB for 164912-byte allocation
10-01 10:59:42.277: D/dalvikvm(6488): GC_FOR_MALLOC freed 8K, 54% free 10196K/22151K, external 2433K/2688K, paused 68ms
10-01 10:59:42.730: D/dalvikvm(6488): GC_FOR_MALLOC freed 509K, 55% free 10017K/22151K, external 2433K/2688K, paused 72ms
10-01 10:59:42.879: D/dalvikvm(6488): GC_FOR_MALLOC freed 364K, 55% free 10066K/22151K, external 2433K/2688K, paused 78ms
10-01 10:59:42.988: D/dalvikvm(6488): GC_FOR_MALLOC freed 39K, 55% free 10117K/22151K, external 2433K/2688K, paused 82ms
10-01 10:59:42.988: I/dalvikvm-heap(6488): Forcing collection of SoftReferences for 201280-byte allocation
10-01 10:59:43.082: D/dalvikvm(6488): GC_FOR_MALLOC freed 8K, 55% free 10108K/22151K, external 2433K/2688K, paused 86ms
10-01 10:59:43.082: E/dalvikvm-heap(6488): Out of memory on a 201280-byte allocation.
10-01 10:59:43.082: I/dalvikvm(6488): "vts_com.jasonflaherty.snoteldata" prio=5 tid=10 RUNNABLE
10-01 10:59:43.082: I/dalvikvm(6488): | group="main" sCount=0 dsCount=0 obj=0x405c8fe0 self=0x1c1ec0
10-01 10:59:43.082: I/dalvikvm(6488): | sysTid=6533 nice=10 sched=0/0 cgrp=bg_non_interactive handle=1628832
10-01 10:59:43.082: I/dalvikvm(6488): at maps.ao.d.a((null):~-1)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.i.cu.a((null):-1)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.k.ah.a((null):-1)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.k.d.a((null):-1)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.k.g.handleMessage((null):-1)
10-01 10:59:43.082: I/dalvikvm(6488): at android.os.Handler.dispatchMessage(Handler.java:99)
10-01 10:59:43.082: I/dalvikvm(6488): at android.os.Looper.loop(Looper.java:130)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.k.d.c((null):-1)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.k.ag.c((null):-1)
10-01 10:59:43.082: I/dalvikvm(6488): at maps.ao.b.run((null):-1)
10-01 10:59:43.129: W/dalvikvm(6488): threadid=10: thread exiting with uncaught exception (group=0x40015560)
10-01 10:59:43.144: E/AndroidRuntime(6488): FATAL EXCEPTION: vts_com.jasonflaherty.snoteldata
10-01 10:59:43.144: E/AndroidRuntime(6488): java.lang.OutOfMemoryError
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.ao.d.a(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.i.cu.a(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.k.ah.a(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.k.d.a(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.k.g.handleMessage(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at android.os.Handler.dispatchMessage(Handler.java:99)
10-01 10:59:43.144: E/AndroidRuntime(6488): at android.os.Looper.loop(Looper.java:130)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.k.d.c(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.k.ag.c(Unknown Source)
10-01 10:59:43.144: E/AndroidRuntime(6488): at maps.ao.b.run(Unknown Source)
10-01 10:59:43.394: D/dalvikvm(6488): GC_FOR_MALLOC freed 195K, 55% free 10116K/22151K, external 2433K/2688K, paused 153ms
10-01 10:59:43.433: W/ResourceType(6488): getEntry failing because entryIndex 939 is beyond type entryCount 1
10-01 10:59:43.433: W/ResourceType(6488): Failure getting entry for 0x7f0b03ab (t=10 e=939) in package 0 (error -2147483647)
10-01 10:59:43.433: E/GooglePlayServicesUtil(6488): The Google Play services resources were not found. Check your project configuration to ensure that the resources are included.
10-01 10:59:43.769: D/dalvikvm(6488): GC_EXTERNAL_ALLOC freed 115K, 55% free 10102K/22151K, external 2433K/2688K, paused 121ms
10-01 10:59:43.824: E/dalvikvm-heap(6488): 80-byte external allocation too large for this process.
10-01 10:59:43.824: W/OSMemory(6488): External allocation of 80 bytes was rejected
10-01 10:59:43.925: D/dalvikvm(6488): GC_FOR_MALLOC freed <1K, 55% free 10102K/22151K, external 2433K/2688K, paused 101ms
10-01 10:59:44.019: W/dalvikvm(6488): threadid=17: thread exiting with uncaught exception (group=0x40015560)
10-01 10:59:44.027: I/Process(6488): Sending signal. PID: 6488 SIG: 9
推荐答案
如何设置此方法，并仅按照此方法添加标记?
How do I set this up and only add my markers per this method?
map.setClustering(new ClusteringSettings().enabled(false).addMarkersDynamically(true));
方法正是这样做的.仅在可见区域中添加Marker到地图. Extensions lib保留了它之外的所有标记，但是没有进行进程间通信以将其放置在地图上.当用户滚动显示不同区域时，将添加它们.
method does exactly that. Adds only Markers in visible region to the map. All markers outside of it are kept by Extensions lib, but no interprocess communication is made in order to put them on the map. They will be added when user scrolls to show different region.
如果您认为地图有问题，我会尝试的第一件事是使用默认标记图标或为所有Marker仅创建一个BitmapDescriptor:
If you think it's something wrong with the map, first thing I would try would be using default marker icon or creating only one BitmapDescriptor for all Markers:
BitmapDescriptor icon = BitmapDescriptorFactory.fromResource(R.drawable.snotel_marker));
for (int i = 0; i < nsize; i++) {
// ...
m = map.addMarker(new MarkerOptions()
.position(new LatLng(latitude, longitude))
.title(title)
.icon(icon);
// ...
}
这应该可以解决OutOfMemoryError问题.
除此之外，您不想循环调用setOnInfoWindowClickListener.一次就足够了.
还有一件事:如果要保留所有数据，则可以将MarkerOptions.snippet和Marker.getSnippet用于String desc.无需将其全部保留在Map<Marker, MapMarkers>数据结构中.如果要在两个String和LatLng旁边保留其他数据，我建议在Extensions lib中使用MarkerOptions.data(marks)(从1.6开始)或Marker.setData(marks).稍后在OnInfoWindowClickListener回调中阅读它:
Other than that, you don't want to call setOnInfoWindowClickListener in a loop. Once is more than enough.
And one more thing: if that's all data you want to keep, you may use MarkerOptions.snippet and Marker.getSnippet for your String desc. No need to keep it all in Map<Marker, MapMarkers> data structure. If you want to keep additional data beside two Strings and LatLng, I suggest using MarkerOptions.data(marks) (since 1.6) or Marker.setData(marks) in Extensions lib. To read it later in OnInfoWindowClickListener callback:
MapMarkers marks = (MapMarkers) marker.getData();
这篇关于仅加载我的位置周围的标记Google Map v2 Android的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
