[android-developers] Re: getFilesDir() throws NullPointerException

Thanks for the very fast response.

> The only reason I can think of for getFilesDir() to
> return null is if it's not a real live Activity instance
> (you created it via new MyActivity() instead of starting
> it with startActivity(), you call getFilesDir() sometime
> after the activity is destroyed, etc.).

Where do I have to call startActivity()?

It's not unlikely that I make something conceptually wrong
in my application, since I'm new to android.

This is what I did:

/*********************************************/
// MainActivity.java
public class MainActivity extends Activity {

public MainActivity() {
}

@Override
public void onCreate(Bundle savedInstanceState) {
// getFilesDir() works here
AnotherClass myA = new AnotherClassImpl();
myA.start();
}
}

// AnotherClassImpl.java
public class AnotherClassImpl implements AnotherClass {
public AnotherClassImpl () {
ProblematicClass props = ProblematicClass.getProperties();
}

// ProblematicClass.java
public class ProblematicClass extends Activity {
private static ProblematicClass myProblematicClass = null;
public static ProblematicClass getProperties(){
if(myProblematicClass == null) {
myProblematicClass = new ProblematicClass();
}
return myProblematicClass;
}

public MediaSenseProperties() {
// getFilesDir() failes here
}
}
/*********************************************/

I hope this illustrates my method. All this should take
place in the same activity.

Marco

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