Android的图形页面与片段不能添加两次？ [英] Android mapview with fragments can't be added twice?

问题描述

我现在用的是android的兼容类黑客使用mapviews在这里找到一个片段：<一href="https://github.com/petedoyle/android-support-v4-googlemaps">https://github.com/petedoyle/android-support-v4-googlemaps

I am using the android compatibility class with the hack for using mapviews in a fragment found here: https://github.com/petedoyle/android-support-v4-googlemaps

不幸的是，我发现是，如果mapfragment被从活动中删除，然后重新添加，我得到了你只能有一个MapActivity一个图形页面的错误。

Unfortunately, what I am finding is that if the mapfragment gets removed from the activity, and then readded, I get the "You are only allowed to have a single MapView in a MapActivity" error."

我理解错误背后的原理，并试图摧毁的碎片的onPause方法的MapView。不幸的是我似乎无法彻底摧毁的MapView，因为我仍然得到它。我的code是这样的：

I understand the principle behind the error, and tried destroying the mapview in the fragments onPause method. Unfortunately I can't seem to destroy the mapview completely, since I am still getting it. My Code looks like this:

private RelativeLayout layout; 
private MapView mp;

public void onResume(){
    super.onResume();
    Bundle args = getArguments();
    if(mp == null)
    {
        mp = new MapView(getActivity(), this.getString(R.string.map_api_key)); 
        mp.setClickable(true);
    }

    String request = args.getString("requestId");
    layout = (RelativeLayout) getView().findViewById(R.id.mapholder);
    layout.addView(mp);
    //TextView txt = (TextView) getView().findViewById(R.id.arguments);
    //txt.setText(request);
}

public void onPause(){
    super.onPause();
    layout.removeView(mp);
    mp = null;
}

有没有人有任何想法什么的参考，我忽略了这里毁灭？

Does anyone have any thoughts on what the reference I am neglecting to destroy here?

推荐答案

我遇到了同样的问题。这是我如何解决它：

I encountered the same issue. Here is how I solved it :

• 因为它应该是在活动的MapView只有一个实例，我在活动onCreate方法初始化：

• As it should be only one instance of the mapView in the activity, I initialize it in onCreate method in Activity :

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    // initialize MapView programmatically to be used in Fragment :
    this.mActivityMapView = new MapView(MainActivity.this, getString(R.string.debug_mapview_apikey));

    setContentView(R.layout.activity_main);
}

然后，我恢复它在片段onCreateView方式：

Then I recover it in the fragment onCreateView method :

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    this.mMapView = ((MainActivity) getActivity()).getMapView();
    return this.mMapView;
}

和我毁掉它在片段的onDestroy方法：

And I destroy it in the fragment onDestroy method :

public void onDestroy() {
    NoSaveStateFrameLayout parentView = (NoSaveStateFrameLayout) this.mMapView.getParent();
    parentView.removeView(this.mMapView);
    super.onDestroy();
}

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