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问题:
I am using the following code to removes childs on every viewgroup:
protected void onDestroy() { super.onDestroy(); this.liberarMemoria(); } public void liberarMemoria(){ imagenes.recycleBitmaps(); this.unbindDrawables(findViewById(R.id.RelativeLayout1)); System.gc(); } private void unbindDrawables(View view) { if (view.getBackground() != null) { view.getBackground().setCallback(null); } if (view instanceof ViewGroup) { for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) { unbindDrawables(((ViewGroup) view).getChildAt(i)); } ((ViewGroup) view).removeAllViews(); } }
where the view: R.id.RelativeLayout1 is a ListView.
But doing this I have en exception:
E/AndroidRuntime(582): java.lang.RuntimeException: Unable to destroy activity {...}: java.lang.UnsupportedOperationException: removeAllViews() is not supported in AdapterView
How can I solve this?
回答1:
Well, the error log pretty much explains it: do not call removeAllViews() on AdapterView. And your code at some point meets ViewGroup that also is AdapterView.
Just rule this case out using instanceof check or handle exception with try/catch wrapper.
回答2:
Verify if your ViewGroup isn't a instance of AdapterView.
Do something like that:
if (!(view instanceof AdapterView<?>)) ((ViewGroup) view).removeAllViews();
So, on your code:
if (view instanceof ViewGroup) { for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) { unbindDrawables(((ViewGroup) view).getChildAt(i)); } if (!(view instanceof AdapterView<?>)) ((ViewGroup) view).removeAllViews(); }
回答3:
Remove that line? Or at least check if the operation is supported with try and catch.
Also, it is a bit confusing to want to do this at all in a method called unbindDrawables, unless it is just a badly named method (doesn't describe what it does fully).
Are you calling all of this in onDestroy? If so, is there benefit from doing this? I was under the impression that the system takes care of this sort of thing for you.
回答4:
Don't call it. UnsupportedOperationException is telling you that this method is not supported or functional so you'll have to accomplish the task another way. I don't see the need in calling this anyway as the garbage collector will handle this task. Bitmap recycling should be done manually if you need to ensure it being done.
