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PODynamic gradient background
 

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    <p>In my application i had a pretty cool idea of changing the background (as gradient) to other gradient colors when an event occured. It all had to happen <code>dynamically</code>, and i spent a couple of hours on this. But it doesn't work because it throws a <code>stackOverflow error</code> when i am using the following tactic.</p> <ul> <li>Set gradientbackground of linearLayout.</li> <li>Convert Hex digits to RGB.</li> <li>Calculate new RGB value.</li> <li>convert back to Hex value.</li> <li>put new hex value as background.</li> </ul> <p>So this background will slightly change during run-time when you press on a button.</p> <p>My question will be, is there a different approach i can use to accomplish this? It is easily possible with a solid colored background, but this isn't what i want.</p> <p>To draw the gradient background i have used:</p> <pre><code> GradientDrawable g = new GradientDrawable(GradientDrawable.Orientation.TOP_BOTTOM, Colors); //Colors is an array with 2 heximal values as int. lnrLayout.setBackgroundDrawable(g); </code></pre> <p>With the following piece of code the RGB values are calculated.</p> <pre><code> int[] ret = new int[3]; int[] ret2 = new int[3]; for(int i=0; i&lt;3; i++){ ret[i] = hexToInt(rgb1.charAt(i*2+2), rgb1.charAt(i*2+1+2)); ret2[i] = hexToInt(rgb2.charAt(i*2+2), rgb2.charAt(i*2+1+2)); } </code></pre> <p>The hexToInt method,</p> <pre><code> public int hexToInt(char a, char b){ int x = a &lt; 65 ? a-48 : a-55; int y = b &lt; 65 ? b-48 : b-55; return x*16+y; } </code></pre> <p>Then i calculated the next rgb code with a simple piece of code and some if-loops were i have setted the values of the <code>ret</code> array from above. Then i wanted to create a new hex value of the new RGB values with,</p> <pre><code> String hex = makeNewHex(ret[0],ret[1],ret[2]); String hex2 = makeNewHex(ret2[0],ret2[1],ret2[2]); public String makeNewHex(int r, int g, int b) { String n; return n = toHex(r,g,b); } public String toHex(int r, int g, int b) { return "#" + toBrowserHexValue(r) + toBrowserHexValue(g) + toBrowserHexValue(b); } private static String toBrowserHexValue(int number) { StringBuilder builder = new StringBuilder(Integer.toHexString(number &amp; 0xff)); while (builder.length() &lt; 2) { builder.append("0"); } return builder.toString().toUpperCase(); } </code></pre> <p>After this the code isn't that importing anymore, because i just had to tweak the hex value a bit, so its compatible to the <code>gradientDrawable</code> method.</p> <p>But i have the feeling i did a little too hard my best.. and there is a way more easier way to accomplish this.</p> <p>For your information, i did not use a timer thread to update the UI, but a <code>RefreshHandler</code>.</p> <p>Someone know how i can do this more efficiently, or with a better tactic so i won't get the <code>stackoverflow error</code>?</p>
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    1. COcheck out [android.graphics.Color](http://developer.android.com/reference/android/graphics/Color.html). It has methods to work with hex values that you've tried to replicate.
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    2. COI don't see methods working with hex values, but i have read somewhere that it is possible to use Color.decode? input: hex, output: rgb values. But i don't think that would be a lot faster. If you mean an other method in [android.graphics.Color](http://developer.android.com/reference/android/graphics/Color.html) can you tell me a little more specific which one?
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    3. COsorry, I meant [java.awt.Color](http://docs.oracle.com/javase/1.4.2/docs/api/java/awt/Color.html). A lot of your methods seem very similar in function to these.
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