使用活动中的按钮从片段到活动获取数据

public interface DataListener {
    void onDataReceived(String data);
}

public class MyFragment extends Fragment {
    private DataListener mListener;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        try {
            mListener = (DataListener) context;
        } catch (ClassCastException e) {
            throw new ClassCastException(context.toString() + " must implement DataListener");
        }
    }

    private void sendDataToActivity(String data) {
        mListener.onDataReceived(data);
    }
}

public class MainActivity extends AppCompatActivity implements DataListener {
    // ...

    @Override
    public void onDataReceived(String data) {
        // 处理从片段传递过来的数据
    }
}