Android谷歌地图动态片段RecyclerView持有人 [英] Android Google Maps dynamic fragment in RecyclerView holder

问题描述

我试图将Google地图片段添加到Android中的RecyclerView中。

我正在阅读它，并且看到我需要动态创建片段，而不是通过XML来实现，以避免重复的ID错误。
$ b

以下是我的适配器代码：

  public class MapViewHolder extends RecyclerView.ViewHolder {
受保护的FrameLayout mapContainer; 
 
 public MapViewHolder（View v）{
 super（v）; 
 view = v; 
 mapContainer =（FrameLayout）v.findViewById（R.id.mapContainer）; 
 
 
 
 private void bindMapRow（final MapViewHolder持有者，int位置）{
 MessageData message =（MessageData）messagesList.get（position）; 
 LocationData location = message.getLocation（）; 
 
 FrameLayout view = holder.mapContainer; 
 FrameLayout frame = new FrameLayout（context）; 
 if（message.getIdMap（）！= 0）{
 frame.setId（message.getIdMap（））; 
} 
 else {
 message.setIdMap（generateViewId（））; 
 frame.setId（message.getIdMap（））; 
 messagesList.set（position，message）; 
} 
 
 int size = context.getResources（）。getDimensionPixelSize（R.dimen.row_chat_map_size）; 
 FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams（size，size）; 
 frame.setLayoutParams（layoutParams）; 
 
 view.addView（frame）; 
 
 GoogleMapOptions options = new GoogleMapOptions（）; 
 options.liteMode（true）; 
 
 SupportMapFragment mapFrag = SupportMapFragment.newInstance（options）; 
 mapFrag.getMapAsync（new MapReadyCallback（location））; 
 
 FragmentManager fm = activity.getSupportFragmentManager（）; 
 FragmentTransaction ft = fm.beginTransaction（）; 
 ft.replace（frame.getId（），mapFrag）; 
 ft.commit（）; 
 
 $ / code> 

执行此操作，我可以看到显示在我的RecyclerView中的地图，运作良好。
当我在RecyclerView中向上滚动一段时间然后再返回到地图时，会出现问题。

当我这样做时，应用程序崩溃并显示此错误：

java .lang.IllegalArgumentException：没有找到id为0x1的视图（未知）
为片段SupportMapFragment {606864b＃0 id = 0x1}

非常感谢和关心，
Marcel。

code> on onBindViewHolder 。

错误原因 IllegalArgumentException ：没有找到id 的视图是 holder.mapContainer 和 frame 未附加到RecyclerView / Activity在 onBindViewHolder 期间（因此视图未找到错误）。

为了保证视图已经存在在调用 FragmentTransaction.replace 之前，先附加到RecyclerView / Activity上，然后监听 onViewAttachedToWindow 。

  class MyAdapter扩展了RecyclerView.Adap之三< MyAdapter.ViewHolder> {
 ... 
 @Override 
 public void onViewAttachedToWindow（ViewHolder持有者）{
 super.onViewAttachedToWindow（持有者）; 
 
 //如果您有多个视图类型，请检查正确的视图类型
 SupportMapFragment mapFragment = holder.mapFragment; 
 if（mapFragment == null）{
 mapFragment = SupportMapFragment.newInstance（）; 
 mapFragment.getMapAsync（new OnMapReadyCallback（）{
 @Override 
 public void onMapReady（GoogleMap googleMap）{
 ... 
} 
}）; 
} 
 
 FragmentManager fragmentManager = getSupportFragmentManager（）; 
 fragmentManager.beginTransaction（）。replace（R.id.map，mapFragment）.commit（）; 
} 
} 
  

https://code.luasoftware.com/tutorials/android/supportmapfragment-in-recyclerview/

I'm trying to add Google Maps fragments into a RecyclerView in Android.

I was reading about it and I saw that I need to create the fragments dynamically instead of doing it by XML to avoid the duplicate ID errors.

Here is my adapter code:

public class MapViewHolder extends RecyclerView.ViewHolder {
    protected FrameLayout mapContainer;

    public MapViewHolder(View v){
        super(v);
        view = v;
        mapContainer = (FrameLayout) v.findViewById(R.id.mapContainer);
    }
}

private void bindMapRow(final MapViewHolder holder, int position) {
        MessageData message = (MessageData) messagesList.get(position);
        LocationData location = message.getLocation();

        FrameLayout view = holder.mapContainer;
        FrameLayout frame = new FrameLayout(context);
        if (message.getIdMap() != 0) {
            frame.setId(message.getIdMap());
        }
        else {
            message.setIdMap(generateViewId());
            frame.setId(message.getIdMap());
            messagesList.set(position, message);
        }

        int size = context.getResources().getDimensionPixelSize(R.dimen.row_chat_map_size);
        FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(size, size);
        frame.setLayoutParams(layoutParams);

        view.addView(frame);

        GoogleMapOptions options = new GoogleMapOptions();
        options.liteMode(true);

        SupportMapFragment mapFrag = SupportMapFragment.newInstance(options);
        mapFrag.getMapAsync(new MapReadyCallback(location));

        FragmentManager fm = activity.getSupportFragmentManager();
        FragmentTransaction ft = fm.beginTransaction();
        ft.replace(frame.getId(), mapFrag);
        ft.commit();
}

Executing this I can see the map displayed into my RecyclerView and all seems to be working well. The problem appears when I scroll up in the RecyclerView for a while and then I go back again to the map.

When I do that the app crashes and shows this error:

java.lang.IllegalArgumentException: No view found for id 0x1 (unknown) for fragment SupportMapFragment{606864b #0 id=0x1}

Many thanks and kind regards, Marcel.

解决方案

I assume bindMapRow is called at onBindViewHolder.

The reason for the error IllegalArgumentException: No view found for id is that holder.mapContainer and frame is not attached to the RecyclerView/Activity yet during onBindViewHolder (thus the view not found error).

To guarantee the view is already attached to RecyclerView/Activity before calling FragmentTransaction.replace, listen to onViewAttachedToWindow instead.

class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
    ...
    @Override
    public void onViewAttachedToWindow(ViewHolder holder) {
        super.onViewAttachedToWindow(holder);

        // If you have multiple View Type, check for the correct viewType 
        SupportMapFragment mapFragment = holder.mapFragment;
        if (mapFragment == null) {
            mapFragment = SupportMapFragment.newInstance();
            mapFragment.getMapAsync(new OnMapReadyCallback() {
                @Override
                public void onMapReady(GoogleMap googleMap) {
                    ...
                }
            });
        }

        FragmentManager fragmentManager = getSupportFragmentManager();
        fragmentManager.beginTransaction().replace(R.id.map, mapFragment).commit();
    }
}

https://code.luasoftware.com/tutorials/android/supportmapfragment-in-recyclerview/

这篇关于Android谷歌地图动态片段RecyclerView持有人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！