code: public void setText(CharSequence s) {
          if (mView == null) {
              throw new RuntimeException("This AppMsg was not created with AppMsg.makeText()");
          }
          TextView tv = (TextView) mView.findViewById(android.R.id.message);
          if (tv == null) {
              throw new RuntimeException("This AppMsg was not created with AppMsg.makeText()");
          }
          tv.setText(s);
      }
docs: Update the text in a AppMsg that was previously created using one of the makeText() methods.
  
  @param s The new text for the AppMsg.