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      1 package com.android.mail.ui;
      2 
      3 public interface UpOrBackController {
      4 
      5     interface UpOrBackHandler {
      6         boolean onBackPressed();
      7         boolean onUpPressed();
      8     }
      9 
     10     void addUpOrBackHandler(UpOrBackHandler handler);
     11     void removeUpOrBackHandler(UpOrBackHandler handler);
     12 }
     13