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copied!<p>I would implement view classes (in <a href="http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller" rel="nofollow">Model-View-Controller</a> notation) that represent the necessary controls and would use <a href="http://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html" rel="nofollow">polymorphism</a> to avoid these if statements.</p> <p><strong>UPDATE:</strong></p> <p>As I understand there is shown an input validation mechanism. I would do the following.</p> <p>My explanation could be more general than it is expected for your particular task. But I think it will help you in future. And please note I am not too proficient with Android API, so you may need to adjuct my references to some Android API classes, for instance a class, that represents a field.</p> <p>So, the first step. Declare the field prototype:</p> <pre><code>abstract FieldPrototype extends AndroidFieldClass { /** * Checks field contents and returns true if field is ok, otherwise shows popup validation message and returns false. * @return see method description. */ public abstract boolean checkField(); } class Et1Field extends FieldPrototype { private String value; public Et1Field() { super(); // your initialization code here } public boolean checkField() { if (value == null || "".equals(value)) { // show validation message specific for Et1Field class instance. return false; } return true; } } // do the same steps for Et2Field .. Et13Field if those fields are different, // and implement specific validation functionality for every kind of a field. </code></pre> <p>In your screen class keep an array of all fields displayed on this screen. On save event in your screen, send <code>save</code> event to all field instances. Every field will invoke it's own checkField() method and validate it's own contents, without showing particular field implementation outside. And if a field validation failed you just stop and let a user to correct a field contents.</p>

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