Java – Build error when using static inner classes

I’m working on a library for Android, and when I use it in my sample project, I keep getting strange errors about static inner classes: “Symbolic variable not found”:

Here is my decomposition code :

Outer.java (SDK project).

public class Outer {

[...] // Attributes and methods

public static class Inner {
        public static int x = 42; 
    }
}

MainActivity .java (sample project).

import com.xxx.xxx.Outer;

public class MainActivity extends Activity {

[...] // Attributes

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

Log.d("MainActivity", "x = " + Outer.Inner.x);
    }
}

This is a log error:

…/sample/MainActivity.java:54: error: cannot find symbol
Log.d(“MainActivity”, “x = ” + Outer.Inner.x);
^

symbol: variable Inner
location: class Outer

I have another case in my SDK:

My class “

ImageHelper” has a static inner class “Builder”.

I use it in

my SDK and it works, but when I want to use it in the sample project, I get the same error when I build run.

Is there an error in my code?

Did you try to compile your own cut code? It works fine when I compile it myself. Maybe it (providing clips) also works for you and your complete program uses a different class?

Based on your code

import com.xxx.xxx.Outer;

And the package line is missing in the Outer code, your project may not have one Outer, but many, one of which has no internal static class.