图形页面没有从ViewPager删除？ [英] MapView not being removed from ViewPager?

问题描述

在我的应用程序，我想实现一个ViewPager内的地图视图。我在申请4不同的页面。和图形页面是在第4页。我没有成功加载地图，但是当我回到轻扫到第一页第四视图必须使用destroyItem（）方法来销毁。如果我刷到第4页，从第3页崩溃显示在logcat的一个错误：

  05-10 13：14：50.152：E / AndroidRuntime（620）：java.lang.IllegalStateException：你只允许有一个图形页面中MapActivity
 

林知道有只在MapActivity一个MapView类的。但我没有能够解决吗？ - 谁能帮助我

code是如下：

 公共对象instantiateItem（查看收集，INT位置）{   LayoutInflater吹气=（LayoutInflater）collection.getContext（）
         .getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
   上下文= collection.getContext（）;
   INT渣油= 0;
   INT标志=渣油;
   开关（位置）{
   情况下0：
      渣油= R.layout.farleft; //第一
      鉴于= inflater.inflate（渣油，NULL）;      打破;
   情况1：
      渣油= R.layout.left; //第二
      鉴于= inflater.inflate（渣油，NULL）;      打破;
   案例2：
      渣油= R.layout.right; //第三
      鉴于= inflater.inflate（渣油，NULL）;      打破;
   案例3：
      渣油= R.layout.mylocator;
      鉴于= inflater.inflate（渣油，NULL）;
      打破;   }
   （（ViewPager）集合）.addView（查看，0）;   返回视图。
}@覆盖
公共无效destroyItem（查看为arg0，ARG1 INT，对象ARG2）{   （（ViewPager）为arg0）.removeView（（查看）ARG2）;
   Log.d（destroyItem，+ ARG2）;
}
 

解决方案

我已经找到了解决办法。
里面的片段，它包含的地图和所使用的ViewPager，端起

 私有视图MyView的;@覆盖
公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，捆绑savedInstanceState）{    如果（this.myView == NULL）{
        this.myView = inflater.inflate（R.layout.my_layout，集装箱，FALSE）;
    }
    否则，如果（this.myView.getParent（）！= NULL）{
        的FrameLayout parentView =（的FrameLayout）this.myView.getParent（）;
        parentView.removeView（this.myView）;
    }    返回this.myView;}
 

它工作正常的我，告诉我它是否适合你;）

In my application I'm trying to implement a map view inside a ViewPager. I have 4 different pages in the application. and MapView is in the 4th page. I did successfully load the map, but when I swipe back to the first page the 4th view must be destroyed using destroyItem() method. And if I swipe to the 4th page, it crashes from 3rd page showing an error in the logcat:

05-10 13:14:50.152: E/AndroidRuntime(620): java.lang.IllegalStateException: You are only allowed to have a single MapView in a MapActivity

Im aware of having only a single mapview in a MapActivity. But I'm not able to solve it - can anyone help me?

Code is below :

public Object instantiateItem(View collection, int position) {

   LayoutInflater inflater = (LayoutInflater) collection.getContext()
         .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   context = collection.getContext();
   int resId = 0;
   int flag = resId;
   switch (position) {
   case 0:
      resId = R.layout.farleft; // first
      view = inflater.inflate(resId, null);

      break;
   case 1:
      resId = R.layout.left; // second
      view = inflater.inflate(resId, null);

      break;
   case 2:
      resId = R.layout.right; // third
      view = inflater.inflate(resId, null);

      break;
   case 3:
      resId = R.layout.mylocator;
      view = inflater.inflate(resId, null);
      break;

   }
   ((ViewPager) collection).addView(view, 0);

   return view;
}

@Override
public void destroyItem(View arg0, int arg1, Object arg2) {

   ((ViewPager) arg0).removeView((View) arg2);
   Log.d("destroyItem", "" + arg2);
}

解决方案

I have found the solution. Inside your fragment which contains the Map and that is used by the ViewPager, put that :

private View myView;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    if (this.myView == null){
        this.myView = inflater.inflate(R.layout.my_layout, container, false);
    }
    else if (this.myView.getParent() != null) {
        FrameLayout parentView = (FrameLayout) this.myView.getParent();
        parentView.removeView(this.myView);
    }

    return this.myView;

}

It works fine for me, tell me if it works for you ;)

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