通过intent和bundle来进行Activity和Fragment的数据传递

是这样的，一个登陆的界面Activity传递数据给主Activity,然后主Activity镶嵌了一个Fragment，数据要在Fragment中显示。

Activity A ------>Activity B ------>Fragment

Activity A:

Intent intent = new Intent(getApplication(), MainActivity.class);
intent.putExtra("username", username_text.getText().toString());
startActivity(intent);

Actiivty B:

Intent intent=getIntent();
String username=intent.getStringExtra("username");
Bundle bundle = new Bundle();
bundle.putString("username", username);
homePageFragment.setArguments(bundle);

Fragment:

String name = getArguments().getString("username");
TextView username= (TextView) getView().findViewById(R.id.find_tv_name);
username.setText(name);