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activity A，跳转至 Activity B ，A传参数user_name给B，然后B再返回修改后的参数user_name给A
首先A传user_name给B
Intent input_B = new Intent(UserInfoActivity.this,ForInputActivity.class); input_driving_age.putExtra("user_name", "哈哈哈"); startActivityForResult(input_B, INFO_USER_NAME);
再B接收A传递过来值：
Intent preIntent = getIntent();
String userName = preIntent.getStringExtra("user_name");
再次，B再回传参数给A
Intent result = new Intent(); result.putExtra("value", value); setResult(RESULT_OK, result); finish();
再次，A再接收B返回的值
protected void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case INFO_USER_NAME: value_name = data.getStringExtra("value"); //接收到的值 } }
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原文地址：http://www.cnblogs.com/feijian/p/4627475.html
