You can pass it using Intent's putExtra() method. try this way,
In First Activity,
Intent intent = new Intent ( FirstAcvity.this, SecondActivity.class );
intent.putExtra ( "TextBox", editText.getText().toString() );
startActivity(intent);
Now, in second activity, use following code,
Intent i = getIntent();
String text = i.getStringExtra ( "TextBox","" );
// Now set this value to EditText
secondEditText.setText ( text );
secondEditText.setEnable(false);
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