newInstance failed: no <init>

I cannot instantiate a sub activity. In the logcat I see this line:

01-22 15:14:38.906: DEBUG/dalvikvm(411): newInstance failed: no <init>()

This is the line in dalvik that generates that logcat.

 * public T newInstance() throws InstantiationException, IllegalAccessException
 * Create a new instance of this class.
static void Dalvik_java_lang_Class_newInstance(const u4* args, JValue* pResult)
    /* find the "nullary" constructor */
    init = dvmFindDirectMethodByDescriptor(clazz, "<init>", "()V");
    if (init == NULL) {
        /* common cause: secret "this" arg on non-static inner class ctor */
        LOGD("newInstance failed: no <init>()\n");

Here is the action I take to activate the activity in a timer handler.

// move on to Activation
// ePNSplash is this activity a splash screen

Intent i = new Intent (ePNSplash.this, Activation.class);
startActivity (i);

The activity that I am trying to start is 2 extensions above Activity

Here is the first extension

public abstract class AndroidScreen extends Activity {

public AndroidScreen (String title, AndroidScreen parent, AndroidScreen main)
    super ();

    myGlobals = Globals.getGlobals ();

    myGlobals.myLogger.logString("AndroidScreen: 001");

    myParent = parent;
    myMainScreen = main;
    myTitle = title;

This is only the constructor, which seems to be the part that has the problem. Here is the 2nd extension and the class i am trying to instantiate.

public class Activation extends AndroidScreen {

public Activation (String title, AndroidScreen parent, AndroidScreen main)
    super (title, parent, main);

I am absolutely confused, I have a constructor, I make sure I call my super constructors, what could possibly be wrong?

Thank you


Asked by: Victoria715 | Posted: 25-01-2022

Answer 1

dalvikvm's looking for a zero-argument constructor (that's what they mean by "nullary", as in "binary" for 2 arguments, "unary" for 1 argument, it's "nullary" for 0 arguments).

in the snippet you've shown, you only have a three-argument constructor. that's no good: you'll be instantiated with no arguments, so you need a zero-argument constructor.

Answered by: Aida401 | Posted: 26-02-2022

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