public void login() {
    Log.d(TAG, "Login");
    if (validate()) {
        this._loginButton.setEnabled(false);
        final ProgressDialog progressDialog = new ProgressDialog(this, R.style.AppTheme.Dark.Dialog);
        progressDialog.setIndeterminate(true);
        progressDialog.setMessage("Authenticating...");
        progressDialog.show();
        String email = this._emailText.getText().toString();
        String password = this._passwordText.getText().toString();
        new Handler().postDelayed(new Runnable() {
            public void run() {
                LoginActivity.this.onLoginSuccess();
                progressDialog.dismiss();
            }
        }, 300);
        return;
    }
    onLoginFailed();
}

FileInputStream in = new FileInputStream("LoginActivity.java");

        com.github.javaparser.ast.CompilationUnit cu;
        try
        {
            cu = JavaParser.parse(in);
        }
        finally
        {
            in.close();
        }
        new MethodVisitor().visit(cu, null);
    }

    private static class MethodVisitor extends VoidVisitorAdapter
    {
        @Override
        public void visit(MethodCallExpr methodCall, Object arg)
        {

            System.out.print("parent node : " +methodCall.getChildrenNodes() +"|| Method call : "+methodCall.getName()+" || "+ methodCall.getScope()+"n");

            List<Expression> args = methodCall.getArgs();
            if (args != null)
                handleExpressions(args);
        }


        private void handleExpressions(List<Expression> expressions)
        {
            for (Expression expr : expressions)
            {
                if (expr instanceof MethodCallExpr)
                    visit((MethodCallExpr) expr, null);
                else if (expr instanceof BinaryExpr)
                {
                    BinaryExpr binExpr = (BinaryExpr)expr;
                    handleExpressions(Arrays.asList(binExpr.getLeft(), binExpr.getRight()));
                }
            }
        }
    }