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POAndroid - Changing an alpha value of a LayerDrawable item , triggered by onClick event
 

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  1. POAndroid - Changing an alpha value of a LayerDrawable item , triggered by onClick event
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    <p>a newbie question.</p> <p>I'm trying to change an <code>alpha value</code> of a <code>bitmap item</code> inside a <code>layer-list</code>.</p> <p>my <code>drawable xml</code> is as follows:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;layer-list xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;item&gt; &lt;bitmap android:src="@drawable/img_btn" android:gravity="center"/&gt; &lt;/item&gt; &lt;item&gt; &lt;bitmap android:src="@drawable/image_frame" android:gravity="center"/&gt; &lt;/item&gt; &lt;/layer-list&gt; </code></pre> <p>my <code>MainActivity</code> is as follows:</p> <pre><code>public class MainActivity extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); MainApp.show(this); addListeners(); changeAlpha(128); } private void changeAlpha(int opc){ ImageView img = (ImageView) findViewById(R.id.img_A); LayerDrawable layer = (LayerDrawable) img.getDrawable(); BitmapDrawable bg = (BitmapDrawable) layer.getDrawable(0); bg.setAlpha(opc); } private void addListeners() { ImageView img = (ImageView) findViewById(R.id.img_A); View.OnClickListener imageAClickListener = new View.OnClickListener() { public void onClick(View view) { changeAlpha(255); } }; img.setOnClickListener(imageAClickListener); } public void onBackPressed() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage(Definitions.CONFIRM_EXIT) .setCancelable(false) .setPositiveButton(Definitions.YES, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { MainActivity.this.finish(); } }) .setNegativeButton(Definitions.NO, new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); AlertDialog alert = builder.create(); alert.show(); } } </code></pre> <p>the first call to <code>changeAlpha</code> (from <code>onCreate</code>) works just fine, but when I call the method from the <code>click</code> event it does nothing (without failing)</p> <p>What am I missing?</p>
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