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POAndroid performance issues in populating ArrayList
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  1. POAndroid performance issues in populating ArrayList
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    copied!<p>I've created a method to populate an array based on a Http response I get from a server. I receive the response in a simple format and read it with a Scanner. The response has only around 8000 entries (floats and integers), and it's taking forever to populate the ArrayList, around 1 or 2 minutes. Here is the code</p> <pre><code>public void update(String str) { ProgressDialog pDialog = new ProgressDialog(context); pDialog.setMessage("Atualizando pesos, aguarde"); pDialog.show(); BufferedReader r = new BufferedReader(new StringReader(str)); Scanner s = null; try{ s = new Scanner(r); ArrayList&lt;ArrayList&lt;ArrayList&lt;Double&gt; &gt; &gt; weights = new ArrayList&lt;ArrayList&lt;ArrayList&lt;Double&gt; &gt; &gt;(); while(s.hasNextInt()){ ArrayList&lt;ArrayList&lt;Double&gt; &gt; wl = new ArrayList&lt;ArrayList&lt;Double&gt; &gt;(); int layerId = s.nextInt(), neuronsAmt = s.nextInt(), inputSize = s.nextInt(); Log.d("UpdateTask", "Layer " + layerId + ", neuronios: " + neuronsAmt + ", inputSize: " + inputSize); for(int i = 0; i &lt; neuronsAmt; i++){ ArrayList&lt;Double&gt; wi = new ArrayList&lt;Double&gt;(); for(int j = 0; j &lt; inputSize; j++){ wi.add(s.nextDouble()); } wl.add(wi); } weights.add(wl); this.weights = weights; if(s.hasNext() &amp;&amp; !s.hasNextInt()) Log.d("UpdateTask", "Depois de tudo tem " + s.next()); } }finally{ if( s != null) s.close(); pDialog.dismiss(); } } </code></pre> <p>I'm calling it from an AsyncTask after the HTTP response is received.</p> <p>EDIT: I'll try to explain the HTTP structure here. The response actually gives the weights for a neural network. Basically it's an array of matrices (which should remain as matrices, for the evaluation of the neural network to work). The HTTP response is as follows: There are N matrices. Each one starts with an integer (the matrix ID), followed by the number of rows(R) and the number of columns(C) in the matrix. After that, there are R*C floats indicating the value stored in the matrix. Input is terminated when you can't find another layer id.</p> <p>PS: I wasn't able to make the dialog work either, but that's not a problem for me now.</p>
 

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