Google Maps Lite Mode 导致 RecyclerView 卡顿 [英] Google Maps Lite Mode causes jank in RecyclerView
问题描述
我有一个 RecyclerView，它是一个垂直滚动的项目列表.每个列表项都包含 Lite 模式.我正在利用这个新功能，它返回位图而不是完整的地图，作为 Google 静态地图 API 的替代品.
MapView 要求您调用 onCreate()、onResume()、onPause()、onDestroy() 等来自父 Activity/Fragment 的相应的方法.从 RecyclerView.Adapter 和/或 RecyclerView.ViewHolder 调用这些的正确位置在哪里?
如何清理回收的 MapViews 以便内存不会泄漏，同时保持列表无卡顿?
<块引用>...精简模式"地图选项，非常适合您想要的情况提供一些较小的地图，或一张非常小的地图有意义的交互是不切实际的，例如列表中的缩略图.
ListItem.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="fill_parent"android:layout_height="fill_parent"><com.google.android.gms.maps.MapViewandroid:id="@+id/mapImageView"xmlns:map="http://schemas.android.com/apk/res-auto"android:layout_width="80dp"android:layout_height="100dp"地图:liteMode =真"地图:地图类型=正常"地图:cameraZoom="15"/><!-- ... --></RelativeLayout>RecyclerView.Adapter 和 ViewHolder
public class NearbyStopsAdapter extends RecyclerView.Adapter{私有最终上下文 mContext；公共类 ViewHolder 扩展 RecyclerView.ViewHolder 实现 View.OnClickListener {地图查看地图；公共 ViewHolder(查看视图){超级(查看)；map = (MapView) view.findViewById(R.id.mapImageView);//应该在这里创建吗?map.onCreate(null);map.onResume();}}公共 NearbyStopsAdapter(上下文 c){this.mContext = c;}@Override public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) {查看 itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_nearby_stop, viewGroup, false);返回新的 ViewHolder(itemView);}@Override public void onBindViewHolder(ViewHolder holder, int position) {//在这里调用异步映射?holder.map.getMapAsync(this);}@Override public void onViewRecycled(ViewHolder holder) {//在这里清理 MapView?//if (holder.map != null) {//holder.map.onPause();//holder.map.onDestroy();//}}@Override public void onViewAttachedToWindow(ViewHolder holder) {//在这里设置 MapView?//holder.map.onCreate(null);//holder.map.onResume();}@Override public void onViewDetachedFromWindow(ViewHolder holder) {//在这里清理 MapView?//if (holder.map != null) {//holder.map.onPause();//holder.map.onDestroy();//}}//...} Logcat:
I/Google Maps Android API:Google Play 服务包版本:659943W/Google Maps Android API: Lite 模式不支持 Map Loaded 回调W/Google Maps Android API:Lite 模式不支持建筑物W/Google Maps Android API:在精简模式下不支持室内W/Google Maps Android API:精简模式不支持切换手势W/Google Maps Android API:精简模式不支持切换手势W/Google Maps Android API:精简模式不支持切换手势W/Google Maps Android API:精简模式不支持切换手势更新:(2018 年 6 月 8 日) Google 发布了在 ListView 中使用 Lite Maps 的代码示例.看这里
解决方案如下:
- 在
ViewHolder类中实现OnMapReadyCallback. - 在
onMapReady中，调用MapsInitializer.initialize，保证在获取地图之前可以使用特征.
<块引用>
如果在获取地图之前需要使用功能，请使用此类来初始化 Google Maps Android API.必须调用它，因为某些类如 BitmapDescriptorFactory 和 CameraUpdateFactory 需要初始化.
- 从
onViewRecycled回收地图.
public class NearbyStopsAdapter extends RecyclerView.Adapter{@覆盖public void onBindViewHolder(ViewHolder holder, int position){//从数据列表中通过位置"获取位置"//获取谷歌地图GoogleMap thisMap = holder.gMap;//然后将地图移动到位置"if(thisMap != null)//将地图移动到位置"thisMap.moveCamera(...);}//为列表项回收GoogleMap@覆盖public void onViewRecycled(ViewHolder holder){//在这里清理 MapView?if (holder.gMap != null){holder.gMap.clear();holder.gMap.setMapType(GoogleMap.MAP_TYPE_NONE);}}公共类 ViewHolder 扩展 RecyclerView.ViewHolder 实现 OnMapReadyCallback {谷歌地图 gMap;地图查看地图；……公共 ViewHolder(查看视图){超级(查看)；map = (MapView) view.findViewById(R.id.mapImageView);如果(地图！= null){map.onCreate(null);map.onResume();map.getMapAsync(this);}}@覆盖公共无效 onMapReady(GoogleMap googleMap) {//如果在获取地图之前需要使用功能，则初始化Google Maps Android APIMapsInitializer.initialize(getApplicationContext());gMap = 谷歌地图；//您可以将这里的地图移动到项目特定的位置"int pos = getPosition();//从数据列表中通过'pos'获取'location'//然后移动到'位置'gMap.moveCamera(...);……}}} I have a RecyclerView which is a vertical scrolling list of items. Each list item contains a Google Maps V2 MapView in Lite Mode. I'm taking advantage of this new feature which returns bitmaps instead of a full-blown map as a replacement to the Google Static Maps API.
MapView requires that you call onCreate(), onResume(), onPause(), onDestroy() etc. from the parent Activity/Fragment's corresponding method. Where is the proper place to call these from the RecyclerView.Adapter and/or RecyclerView.ViewHolder?
How can I clean up recycled MapViews so that memory doesn't leak, while keeping the list jank free?
Google says Lite Mode can be used in lists:
... ‘lite mode’ map option, ideal for situations where you want to provide a number of smaller maps, or a map that is so small that meaningful interaction is impractical, such as a thumbnail in a list.
ListItem.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.google.android.gms.maps.MapView
android:id="@+id/mapImageView"
xmlns:map="http://schemas.android.com/apk/res-auto"
android:layout_width="80dp"
android:layout_height="100dp"
map:liteMode="true"
map:mapType="normal"
map:cameraZoom="15"/>
<!-- ... -->
</RelativeLayout>
RecyclerView.Adapter and ViewHolder
public class NearbyStopsAdapter extends RecyclerView.Adapter<NearbyStopsAdapter.ViewHolder> {
private final Context mContext;
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
MapView map;
public ViewHolder(View view) {
super(view);
map = (MapView) view.findViewById(R.id.mapImageView);
// Should this be created here?
map.onCreate(null);
map.onResume();
}
}
public NearbyStopsAdapter(Context c) {
this.mContext = c;
}
@Override public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) {
View itemView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_item_nearby_stop, viewGroup, false);
return new ViewHolder(itemView);
}
@Override public void onBindViewHolder(ViewHolder holder, int position) {
//Call Async Map here?
holder.map.getMapAsync(this);
}
@Override public void onViewRecycled(ViewHolder holder) {
// Cleanup MapView here?
// if (holder.map != null) {
// holder.map.onPause();
// holder.map.onDestroy();
// }
}
@Override public void onViewAttachedToWindow(ViewHolder holder) {
// Setup MapView here?
// holder.map.onCreate(null);
// holder.map.onResume();
}
@Override public void onViewDetachedFromWindow(ViewHolder holder) {
// Cleanup MapView here?
// if (holder.map != null) {
// holder.map.onPause();
// holder.map.onDestroy();
// }
}
// ...
}
Logcat:
I/Google Maps Android API﹕ Google Play services package version: 659943
W/Google Maps Android API﹕ Map Loaded callback is not supported in Lite Mode
W/Google Maps Android API﹕ Buildings are not supported in Lite Mode
W/Google Maps Android API﹕ Indoor is not supported in Lite Mode
W/Google Maps Android API﹕ Toggling gestures is not supported in Lite Mode
W/Google Maps Android API﹕ Toggling gestures is not supported in Lite Mode
W/Google Maps Android API﹕ Toggling gestures is not supported in Lite Mode
W/Google Maps Android API﹕ Toggling gestures is not supported in Lite Mode
Update: (Jun 8, 2018) Google has released a code sample for using Lite Maps in a ListView. See here
Solution as following:
- Implement
OnMapReadyCallbackinViewHolderclass. - In
onMapReady, callMapsInitializer.initialize, to gaurantee features can to be used before obtaining a map.
Use this class to initialize the Google Maps Android API if features need to be used before obtaining a map. It must be called because some classes such as BitmapDescriptorFactory and CameraUpdateFactory need to be initialized.
- Recycle map from
onViewRecycled.
public class NearbyStopsAdapter extends RecyclerView.Adapter<NearbyStopsAdapter.ViewHolder> {
@Override
public void onBindViewHolder(ViewHolder holder, int position)
{
//get 'location' by 'position' from data list
//get GoogleMap
GoogleMap thisMap = holder.gMap;
//then move map to 'location'
if(thisMap != null)
//move map to the 'location'
thisMap.moveCamera(...);
}
//Recycling GoogleMap for list item
@Override
public void onViewRecycled(ViewHolder holder)
{
// Cleanup MapView here?
if (holder.gMap != null)
{
holder.gMap.clear();
holder.gMap.setMapType(GoogleMap.MAP_TYPE_NONE);
}
}
public class ViewHolder extends RecyclerView.ViewHolder implements OnMapReadyCallback {
GoogleMap gMap;
MapView map;
... ...
public ViewHolder(View view) {
super(view);
map = (MapView) view.findViewById(R.id.mapImageView);
if (map != null)
{
map.onCreate(null);
map.onResume();
map.getMapAsync(this);
}
}
@Override
public void onMapReady(GoogleMap googleMap) {
//initialize the Google Maps Android API if features need to be used before obtaining a map
MapsInitializer.initialize(getApplicationContext());
gMap = googleMap;
//you can move map here to item specific 'location'
int pos = getPosition();
//get 'location' by 'pos' from data list
//then move to 'location'
gMap.moveCamera(...);
... ...
}
}
}
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