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POGet ImageView drawable ID and change it with AsyncTask
 

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    <p>What I want to do: get the id of the src of an ImageView, compare it to the ids of two drawables, and swap them, using AsyncTask (just because I want to understand how it works). I've read similar questions here, and so far this is what I've got:</p> <pre><code>public class Main extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); ImageView image = (ImageView) findViewById(R.id.img); Integer integer = (Integer) image.getTag(); } private class cambiarImagen extends AsyncTask&lt;Integer, Integer, Integer&gt; { protected void onPreExecute() { ImageView image = (ImageView) findViewById(R.id.img); Integer integer = (Integer) image.getTag(); int img1 = R.drawable.zapato; int img2 = R.drawable.zapatod; } @Override protected Integer doInBackground(Integer... values) { // parte logica int num = values[0]; int zapato = values[1]; int zapatod = values[2]; if (num == zapato) { num = zapatod; } else if (num == zapatod) { num = zapato; } return num; } protected Void onPostExecute(Integer... values) { int num = values[0]; ImageView image = (ImageView) findViewById(R.id.img); image.setTag(num); return null; } } </code></pre> <p>Of course this doesn't work. 1. I don't understand how to get the id of the drawable that ImageView has as its src. 2. I don't understand how the params are passed in AsyncTask; onPreExecute should receive the UI stuff, doInbackground should receive it to compare it and return the drawable int that should be set to the ImageView, and onPreExecute should set it to the ImageView.</p>
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    1. COFor starters, you can just omit the parameters and use the other version of AsyncTask (non-generic). Then, you can declare private members in Main and store the values there before starting the AsyncTask, and since it is an inner-class, it will have access to these member.
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    2. COI don't think a view's background-id can be determined at runtime. However, this should already be known, since its usually set in a layout or onCreate, and if your coding "properly", this value will be defined in a resource file (R.Drawable.bkground). I usually don't run into cases where I don't know what the value is, and if it changes (say white/enabled to grey/disabled), then you keep track by initializing to one color, and then setting appropriately based on other conditions (which is usually determined by user input, not the current background).
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