在Java中访问外部类的变量

Question

in Java android application how can i access variables of outer class from the inner anonymous class ? Example:

    ProgressDialog dialog = new ProgressDialog(this);
    .....
    send.setOnClickListener(new View.OnClickListener() 
    {
        public void onClick(View v) {

           //here i'd like to do something with **dialog** variable
           .......

        }
    });

Answer 1

If the dialog variable is a field of the outer class, you can use this prefixed with the outer class name ( a qualified this ):

send.setOnClickListener(new View.OnClickListener() 
{
    public void onClick(View v) {
       ProgressDialog dlg = OuterClass.this.dialog;
       .......
    }
});

Alternatively, if the dialiog variable is a local variable it needs to be marked as final:

final ProgressDialog dialog = new ProgressDialog(this);
.....
send.setOnClickListener(new View.OnClickListener() 
{
    public void onClick(View v) {
       // The dialog variable is in scope here ...
       dialog.someMethod();
    }
});

Answer 2

使外部局部变量（ dialog ） final以便您可以从内部类引用它。

Answer 3

If it's a local variable (like the signature suggests), it needs to be final for the inner class to be able to access it. If it's a member variable, the visibility modifier needs to be default (no modifier) or higher (protected or public). With private -modifier, it still works, but you might get a warning (depending on your compiler-settings):

Read access to enclosing field SomeClass.someField is emulated by a synthetic accessor method