传值

Intent intent =newIntent(MainActivity.this,Main2Activity.class);

String a =editText1.getText().toString().trim();

String b =editText2.getText().toString().trim();

intent.putExtra("message",a+"+"+b+"="+"?");

startActivityForResult(intent,1000);

实现的方法

protected voidonActivityResult(intrequestCode, intresultCode,Intent data) {

super.onActivityResult(requestCode,resultCode,data);

if(requestCode==1000&& resultCode==1001){

String res = data.getStringExtra("result");

editText3.setText(res);

}

}

获取值回传

String res =editText2.getText().toString().trim();

Intent intent1 =newIntent();

intent1.putExtra("result",res);

setResult(1001,intent1);

finish();