如何在片段内使用SupportMapFragment？ [英] How to use SupportMapFragment inside a Fragment?

问题描述

我知道在使用嵌套片段时存在一个问题。但我的应用程序被设计为运行碎片，如果我将使用活动的地图，我的铸造函数将有错误。

我想问你的帮助关于如何实现这一点。我一直在互联网上搜索，但我找不到最好的解决方案。

我试过这段代码：

  private void setUpMapIfNeeded ）{
 //做一个空检查来确认我们还没有实例化地图。 
 if（mMap == null）{
 //尝试从SupportMapFragment获取映射。 
 mMap =（（SupportMapFragment）myFragmentActivity.getSupportFragmentManager（）。findFragmentById（R.id.map_con））
 .getMap（）; 
 //检查我们是否成功获取地图。 
 if（mMap！= null）{
 mMap.setMyLocationEnabled（true）; 
 
 
 
 $ / code $ / pre 
 
这会给我重复的错误因为R.id.map_con是我片段中的一个片段。
 
 
 
所以我寻找解决方法，这次，R.id.map_con是一个框架布局，在运行时我创建了SupportMapFragment。
  SupportMapFragment mSupportMapFragment = new SupportMapFragment（）; 
 myFragmentActivity.getSupportFragmentManager（）。beginTransaction（）
 .replace（R.id.map_con，mSupportMapFragment）.commit（）; 
  
虽然这并不会在每次关闭并打开片段时都会有重复。但我的错误是，mSupportMapFragment.getMap始终为空，我不明白为什么它的空值。
  mMap = mSupportMapFragment.newInstance（）的GetMap（）; 
 if（mMap！= null）{
 Log.e（ReportFragment，mMap is not empty）; 
} else {
 Log.e（ReportFragment，mMap is empty）; 
} 
  
我真的很感谢你们的任何意见，或者你有其他工作围绕但仍然在这个过程中，即片段内碎片 
 
 
谢谢 
 
  chkm8 
 $ b $        >我已经使用过这个： 
 
 
  @Override 
 public View onCreateView（LayoutInflater inflater，ViewGroup container，Bundle savedInstanceState）{ 
查看v = inflater.inflate（R.layout.fragment_location，container，false）; 
 mMapFragment = new SupportMapFragment（）{
 @Override 
 public void onActivityCreated（Bundle savedInstanceState）{
 super.onActivityCreated（savedInstanceState）; 
 mMap = mMapFragment.getMap（）; 
 if（mMap！= null）{
 setupMap（）; 
} 
} 
}; 
 getChildFragmentManager（）。beginTransaction（）。add（R.id.framelayout_location_container，mMapFragment）.commit（）; 
 return v; 
} 
  
感谢此旧文章 
 
I know that there has been an issue in using a nested fragment. But my application was designed to run on fragments and if i will be using activity for the map, my casting functions will have error.

I would like to ask help from you on how to achieve this. I've been searching in the internet but i couldn't find best solution. 

I've tried this code:
private void setUpMapIfNeeded() {
    // Do a null check to confirm that we have not already instantiated the map.
    if (mMap == null) {
        // Try to obtain the map from the SupportMapFragment.
        mMap = ((SupportMapFragment) myFragmentActivity.getSupportFragmentManager().findFragmentById(R.id.map_con))
                .getMap();
        // Check if we were successful in obtaining the map.
        if (mMap != null) {
            mMap.setMyLocationEnabled(true);
        }
    }
}
this would give me duplicate error because of R.id.map_con is a fragment inside my fragment.

So I look for a work around, this time, R.id.map_con is a frame layout and in the run time I created the SupportMapFragment to it.
SupportMapFragment mSupportMapFragment = new SupportMapFragment();
    myFragmentActivity.getSupportFragmentManager().beginTransaction()
            .replace(R.id.map_con, mSupportMapFragment).commit();
though this does not give me a duplicate every time a close and open the fragment. but my error is that mSupportMapFragment.getMap is always null., I don't get it why its null?.
mMap = mSupportMapFragment.newInstance().getMap();
        if (mMap != null){
            Log.e("ReportFragment","mMap is not empty");
        }else{
            Log.e("ReportFragment","mMap is empty");
        }
I would really appreciate any inputs from you guys, or do you have another work around but still in this process, i.e Fragment inside fragment

Thanks 

chkm8
解决方案
I just met my luck, while making this post,I found what Im looking for.

I have used this:
 @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_location, container, false);
    mMapFragment = new SupportMapFragment() {
        @Override
        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            mMap = mMapFragment.getMap();
            if (mMap != null) {
                setupMap();
            }
        }
    };
    getChildFragmentManager().beginTransaction().add(R.id.framelayout_location_container, mMapFragment).commit();
return v;   
}
Credit to this Old post

                        
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