Android development Note: rewrite onBackPressed () of the Return key

In android development, when the trigger condition is not met, press the return key. Especially when the current Activity needs to send messages to a previous Activity. That is, when Activity1 jumps to Activity3, if startActivityForResult is used, if the return key is not rewritten, the program reports an error if it does not know what content to return to Activity1. Therefore, the Return key of Activity3 must be rewritten. Here, let him send an "ERROR" message: Copy codeThe Code is as follows: @ Override
Public void onBackPressed (){
// TODO Auto-generated method stub
Intent backIntent = new Intent (Activity3.this, Activity1.class );
Bundle bundle = new Bundle ();
If (! ClickOk)
Bundle. putString ("send", "ERROR ");
BackIntent. putExtras (bundle );
Activity3.this. setResult (1, backIntent );
Activity3.this. finish ();
// Super. onBackPressed ();
}