FirstActivity：
Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
startActivityForResult(intent, 1);
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case 1:
if (resultCode == RESULT_OK) {
String returnedData = data.getStringExtra("data_return");
Log.d("FirstActivity", returnedData);
}
break;
default:
}
}
SecondActivity：
Intent intent = new Intent();
intent.putExtra("data_return", "Hello FirstActivity");
setResult(RESULT_OK, intent);
finish();
原文：http://session.blog.51cto.com/8308112/1728435