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copied!<p>The error message </p> <blockquote> <p>Default constructor cannot handle exception type IOException thrown by implicit super constructor. Must define an explicit constructor.</p> </blockquote> <p>is quite clear. You have a base class of which the constructor throws an <code>IOException</code>:</p> <pre><code>public class BaseClass { public BaseClass() throws IOException { // ... } } </code></pre> <p>And you are trying to subclass it:</p> <pre><code>public class SubClass extends BaseClass { } </code></pre> <p>But the (now implicit) constructor of <code>SubClass</code> implicitly calls <code>super()</code> which throws an exception for which the subclass is not prepared at all, since the implicit constructor looks like this:</p> <pre><code>public SubClass() { super(); // this throws an IOException which is not declared to be thrown by SubClass constructor } </code></pre> <p>So, you must define an explicit constructor:</p> <pre><code>public SubClass() throws IOException { super(); } </code></pre> <p><strong>UPDATE</strong></p> <p>The problem in fact is caused by initializing instance fields with initializers throwing exceptions. In this case you have to move them in a constructor which throws the exception:</p> <pre><code>public MainActivity() throws IOException { File infile = new File("inputtextfile.txt"); Scanner fsc = new Scanner(infile); AssetManager assetManager = getAssets(); Scanner fsc1 = new Scanner(assetManager.open("inputtextfile.txt")); } </code></pre>

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