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POReflection in Android is not working
 

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  1. POReflection in Android is not working
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    <p>I tried using reflection to use a custom List View for an App with target api level 7. The necessary fileds are only available from api level 9 so I attempted to fix that via reflection. </p> <p>I need to find the protected Method View.overScrollBy( int,int,int,int,int,int,int,int,boolean). When i call </p> <pre><code>View.getDeclaredMethods() </code></pre> <p>and iterate over the Method[] array i find it, but when I try </p> <pre><code>View.class.getDeclaredMethod(String name, Class...&lt; ? &gt; paramTypes) </code></pre> <p>I get a NoSuchMethodException. I compared the hard coded Method Name and parameterType values with the values extracted from the method (found via iteration) and they are identical...</p> <pre><code>private boolean initCompatibility() { Method[] methods = View.class.getDeclaredMethods(); try { // The name of the Method i am looking for; String OVERSCROLL_S = "overScrollBy"; for (Method meth : methods) { if (meth.getName().equals(OVERSCROLL_S)) { mListView_overScrollBy = meth; break; // method found } } // Params for getDeclaredMethod(…) String methodName = "overScrollBy"; Class[] methodParams = { Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE, Integer.TYPE, Boolean.TYPE }; // works Method test = View.class.getDeclaredMethod(methodName,methodParams); // fails View.class.getDeclaredMethod(mListView_overScrollBy.getName(), mListView_overScrollBy.getParameterTypes()); /* * I also tried this way around and again the first worked and the second * failed, so the input arguments are not the problem... * View.class.getDeclaredMethod( mListView_overScrollBy.getName(), * mListView_overScrollBy.getParameterTypes() ); * Method test = View.class.getDeclaredMethod(methodName,methodParams); */ return true; } catch (SecurityException e) { e.printStackTrace(); return false; } catch (NoSuchMethodException e) { e.printStackTrace(); return false; } } </code></pre> <p>I do not understand why the call always works the first time and the does not the second time. Interestingly it also fails when i call only once for View.class.getDeclaredMethod(String name, Class...&lt; ? > paramTypes) and it does not make any difference whether i use the hard coded input values or the one extracted from the method I am looking for...</p> <p>Does anybody know what the problem is? Thanks</p>
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    1. USNemoOudeis
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    1. COLook at my answer. Could you confirm if your exception is thrown in both debug and run modes?
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      1. USMister Smith
    2. COStupid question time! Is this the real code that you are running? Any chance the `View` you investigate earlier is a different class then the one later? Different `import` since it's a common class name.
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    3. COAnother stupid question: Do you get an output at the printStackTrace? I just run your exact code in an emulator, and didn't get an output. Also, when debuging Android apps in eclipse, the line numbers esp. with returns are not correct. So after the 2nd getDeclaredMethod, the IP points to the return statement in the catch block, even if no exception was thrown at all! (encountered such behaviour quite often)
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      1. USking_nak
 

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