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POSetting visible to elements that were invisible before in GridView
 

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  1. POSetting visible to elements that were invisible before in GridView
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    <p>I have a GridView in which I want to always show 7 icons, and sometimes an additional icon depending on a request. In the beginning the additional icon is never shown. This is the structure:</p> <pre><code>0 1 2 3 4 5 6 [7] </code></pre> <p>All the icons fit into the screen so I don't need/have scroll. Each icon is composed by an image and a text.</p> <p>For this, I have a CustomAdapter which extends BaseAdapter. I have overriden the getView method in which I set the text and the image for each icon.</p> <pre><code>public View getView(int position, View convertView, ViewGroup parent) { View v = null; if (convertView == null) { LayoutInflater li = ((Activity) context).getLayoutInflater(); v = li.inflate(R.layout.icon, null); } else { v = convertView; } TextView tv = (TextView) v.findViewById(R.id.icon_textView); tv.setText(position); ImageView iv = (ImageView) v.findViewById(R.id.icon_ImageView); iv.setImageResource(imageResourcesArray[position]); if ((position == ADDITIONAL_ICON)) &amp;&amp; !showAdditionalIcon) { v.setVisibility(View.INVISIBLE); } return v; } </code></pre> <p>The <code>imageResourcesArray[]</code> is an array of integers with the image resources. The other functions and variables in the CustomAdapter are:</p> <pre><code>public static final int ADDITIONAL_ICON = 7; private boolean showAdditionalIcon = false; public showAdditionalIcon(){ this.showAdditionalIcon = true; notifyDataSetChanged(); // notifyDataSetInvalidated(); } public hideAdditionalIcon(){ this.showAdditionalIcon = false; notifyDataSetChanged(); // notifyDataSetInvalidated(); } </code></pre> <p>Later on, I create and set the CustomAdapter to the GridView from a class which extends Activity (say <code>ClassA</code>):</p> <pre><code> GridView grid = (GridView) findViewById(R.id.main_gridView); customAdapter = new CustomAdapter(this); grid.setAdapter(customAdapter); </code></pre> <p>My problem appears when after some calculations and requests to a server, I have to show the additional icon (number 7). So I call (from <code>ClassA</code>):</p> <pre><code> customAdapter.showAdditionalIcon(); </code></pre> <p>Now, the additional icon appears, but the first icon disappears... I have tried to use <code>notifyDataSetInvalidated()</code> and <code>notifyDataSetChanged()</code> but both had the same result.</p> <p>Of course, I could generate a new <code>CustomAdapter</code> with the additional icon allowed, but I would preffer not to do it...</p> <p>Thanks in advance.</p>
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    1. USjalv1039
    1. USjalv1039
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      1. VTUpMod
    1. COv.setVisibility(View.INVISIBLE); instead of this try v.setVisibility(View.GONE); Secondly, when you need to show it view.setVisibility(View.VISIBLE);
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      1. USVinay
    2. CObut if I do this you suggest, I should save the view of icon 7 in a variable, isn't it? Right now, I don't save any of the views, so the BaseAdapter should know when to update/regenerate all the icons.
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      1. USjalv1039
    3. COI finally did what you suggested. I removed the notifyDataSetInvalidated() and notifyDataSetChanged() calls and it works great. Thank you!
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      1. USjalv1039
 

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