【发布时间】：2018-02-10 03:52:10
【问题描述】：
我目前正在尝试编写一个使用标记在地图上显示多个位置的应用程序。即使只使用相对“小”的一组标记（我已经看到人们想要绘制超过 100k 的 StackOverflow 问题），我的性能也很糟糕，而且我的地图需要几秒钟才能移动。
我还有一张我的 GPU 分析的屏幕截图，我想知道是否有人能理解为什么这些调用如此之高：
我尝试使用 DDMS 分析我的应用程序，但这似乎没有给我任何确凿的答案。
我使用的代码如下：
tab_map.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
android:name="com.google.android.gms.maps.SupportMapFragment"
class="com.google.android.gms.maps.SupportMapFragment"
android:id="@+id/city_map"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="?attr/actionBarSize" />
</FrameLayout>
LocationFragment.java
/* a whole list of imports and package definition */
/**
* Created by Ruben on 05-08-17.
*/
public class LocationsFragment extends Fragment
implements OnMapReadyCallback {
private static final String TAG = LocationsFragment.class.getSimpleName();
private LocationsFragment instance;
private City city;
private List<Marker> markers;
private List<Location> locations;
private Target iconTarget;
private GoogleMap map;
private SupportMapFragment mapFragment;
private BitmapDescriptor markerIcon;
private Bitmap markerIconBitmap;
private ApiService apiService;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.tab_map, null);
}
@Override
public void onActivityCreated(Bundle savedInstanceStace) {
super.onActivityCreated(savedInstanceStace);
// Set up the view
instance = this;
mapFragment = (SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.city_map);
apiService = RestClient.getClient(getContext()).create(ApiService.class);
city = getArguments().getParcelable("city");
markers = new ArrayList<>();
iconTarget = new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
markerIconBitmap = bitmap;
updateMarkerIcons();
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
};
// Start async processes
// Load Google map
mapFragment.getMapAsync(this);
// Load locations from API
getLocations();
// Load custom marker for city
getCityMarker();
}
private void getCityMarker() {
Picasso
.with(getContext())
.load(city.getMarker().getUrl())
.resize(ScreenUtils.convertDIPToPixels(getContext(), 24), ScreenUtils.convertDIPToPixels(getContext(), 24))
.into(iconTarget);
}
@Override
public void onMapReady(GoogleMap map) {
this.map = map;
if(markerIconBitmap == null) {
markerIcon = BitmapDescriptorFactory.fromAsset("default1.png");
}else{
markerIcon = BitmapDescriptorFactory.fromBitmap(markerIconBitmap);
}
if (ContextCompat.checkSelfPermission(this.getContext(), "ACCESS_FINE_LOCATION") == PackageManager.PERMISSION_GRANTED) {
map.setMyLocationEnabled(true);
} else {
Toast.makeText(instance.getContext(), getString(R.string.no_location_permission), Toast.LENGTH_LONG).show();
}
map.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(city.getCenter().getLat(), city.getCenter().getLong()), 12));
setMarkers();
}
public void getLocations() {
Call<LocationsResponse> call = apiService.getLocations(city.getId());
call.enqueue(new Callback<LocationsResponse>() {
@Override
public void onResponse(Call<LocationsResponse> call, Response<LocationsResponse> response) {
if(response.code() != 200) {
Toast.makeText(instance.getContext(), getString(R.string.retrieving_locations) + "1", Toast.LENGTH_LONG).show();
return;
}
Log.d(TAG, "Received locations: " + response.body().getLocations().size());
locations = response.body().getLocations();
setMarkers();
}
@Override
public void onFailure(Call<LocationsResponse> call, Throwable t) {
t.printStackTrace();
Toast.makeText(instance.getContext(), getString(R.string.retrieving_locations) + "1", Toast.LENGTH_LONG).show();
}
});
}
public void setMarkers() {
Log.d(TAG, "Calling setMarkers");
if(map != null && locations != null) {
// Remove all the old markers
if(!markers.isEmpty()) {
int numMarkers = markers.size();
for(int i = 0; i < numMarkers; i++) {
markers.get(i).remove();
}
markers.clear();
}
// Create a new marker for each location
int numLocations = locations.size();
Log.d(TAG, "Setting markers for " + numLocations + " locations");
for(int i = 0; i < numLocations; i++) {
Location location = locations.get(i);
markers.add(map.addMarker(
new MarkerOptions()
.position(new LatLng(location.getPosition().getLat(), location.getPosition().getLong()))
//.icon(markerIcon)
//.title(location.getName())
//.snippet(getString(R.string.location_marker_text, NumberFormat.getInstance().format(location.getStones())))
));
}
}
}
public void updateMarkerIcons() {
Log.d(TAG, "Calling updateMarkerIcons");
if(map != null && markerIconBitmap != null) {
markerIcon = BitmapDescriptorFactory.fromBitmap(markerIconBitmap);
}
if(map != null && !markers.isEmpty()) {
int numMarkers = markers.size();
for(int i = 0; i < numMarkers; i++) {
Marker marker = markers.get(i);
//marker.setIcon(markerIcon);
}
}
}
@Override
public void onDestroyView() {
Picasso.with(this.getContext()).cancelRequest(iconTarget);
mapFragment.onDestroyView();
super.onDestroyView();
}
public void updateLocations() {
if(locations != null) {
getLocations();
}
}
public void setCity(City city) {
this.city = city;
getCityMarker();
}
}
如您所见，我取消了一些我为标记设置.snippet 或.icon 的行的注释，因为我怀疑这可能是问题所在。可悲的是，这似乎不是问题。
使用断点，我试图确认我设置/编辑标记的所有函数都没有在它们应该被调用之后被调用，我发现这绝对不是这种情况。设置标记后，不会在此文件中执行任何其他代码。我所有的其他活动似乎都运行良好，所以我开始相信这是与谷歌地图有关的问题。值得注意的是，当我离开标记时，即不再处于屏幕边界内时，性能还不错，滚动看起来很流畅。
【问题讨论】：
标签： android google-maps