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POAndroid interfacing
 

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    <p>I always have this problem of <code>java.lang.IllegalStateException:Could not execute method of the activity</code>. I was planning to perform an android component event (ex. Button event - indicating the number of times this button was clicked). Here's the code snippet for this problem: </p> <pre><code>interface Selection { public void clicked(); } public class ParentClass extends FragmentActivity { // fTabs : FragmentTabHost // tabs : Map&lt;String, Selection&gt; private void initialize() { // fistFrag : FirstChildClass = new FirstChildClass() // secondFrag : SecondChildClass = new SecondChildClass() tabs.put("first", firstFrag); tabs.put("second", secondFrag); fTabs.add(fTab.newTabSpec("first").setTitle("First"), firstFrag.getClass(), null) fTabs.add(fTab.newTabSpec("second").setTitle("Second"), secondFrag.getClass(), null) } @Override public void onBackPressed() { tabs.get(fTabHost.getCurrentTabTag()).clicked(); } } public class FirstChildClass extends Fragment implements Selection { // data : TextView // hit : int = 0 @Override public void clicked() { data.setText(String.format("Hit Count: %d", ++hit)); } } public class SecondChildClass extends Fragment implements Selection { // data : TextView // hit : int = 0 @Override public void clicked() { data.setText(String.format("Hit Count: %d", ++hit)); } } </code></pre> <p>I've tried to assure of <code>clicked()</code> works view interfacing approach by invoking a message on <code>Logcat</code> and it worked but when I used <code>Button</code> the error above always prompts me. I've checked if <code>data</code> is null and it returned <code>true</code>. I am a little bit confused, I've tried to check nullity of <code>data</code> from the <code>Activity</code> methods is returns <code>false</code> but when I access any method override by an interface it always return <code>true</code>. Is there a way to solve this?</p>
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    1. USKaido Shugo
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    1. COI think your tabs should be a Map<String, ChildClass> because now you're only referencing to the interface (selection) without implementing it into an activity
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      1. USNiko Adrianus Yuwono
    2. COI have updated my question regarding how I create object of `ChildClass`.
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      1. USKaido Shugo
    3. CO@NAYOSO: sorry i've just understood your comment, the idea is that there are different classes other than `ChildClass` to be added in `fTabHost`.
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