Android中在一个fragment中设置另一个fragment的textview

可以通过在父Fragment中获取子Fragment的方式来实现。具体步骤如下：

1. 在父Fragment中获取子Fragment的实例。假设子Fragment的id为childFragment。

ChildFragment childFragment = (ChildFragment) getChildFragmentManager().findFragmentById(R.id.childFragment);

2. 在父Fragment中调用子Fragment中的方法来设置TextView的值。假设子Fragment中有一个名为setText的公共方法来设置TextView的值。

childFragment.setText("Hello World");

完整的示例代码如下：

public class ParentFragment extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_parent, container, false);

        ChildFragment childFragment = (ChildFragment) getChildFragmentManager().findFragmentById(R.id.childFragment);
        childFragment.setText("Hello World");

        return view;
    }
}

public class ChildFragment extends Fragment {

    private TextView mTextView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_child, container, false);
        mTextView = (TextView) view.findViewById(R.id.textView);
        return view;
    }

    public void setText(String text) {
        mTextView.setText(text);
    }
}