document.write('
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  1. private static final int TIME_INTERVAL = 2000; // # milliseconds, waktu yang diperlukan dalam menekan backpress yang kedua.
  2. private long mBackPressed;
  3.  
  4. @Override
  5. public void onBackPressed()
  6. {
  7.     if (mBackPressed + TIME_INTERVAL > System.currentTimeMillis())
  8.     {
  9.         super.onBackPressed();
  10.         return;
  11.     }
  12.     else
  13.     {
  14.         Toast.makeText(getBaseContext(), "Tekan sekali lagi untuk keluar", Toast.LENGTH_SHORT).show(); // pesan yang tampil.
  15.     }
  16.  
  17.     mBackPressed = System.currentTimeMillis();
  18. }
');