How to use Toast when I cant use "this" as context

If the toast is located inside your activity class, you could use YourActiviy.this where YourActivity is the class name. If it's outside your class, you'll need to get your activity context (pass it in the constructor etc).

If you are in the inner Class then try this also

getApplicationContext()

You can use NameOfYourActivity.this

For example:

public class MyActivity extends Activity {

 ...
     Toast.makeText(MyActivity.this, text, duration).show();