android和demo机器之间的Web Socket通信

Question

我是初学者，想要将if-else转换为切换。

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    if (container == null) {
        return null;
    }


    LinearLayout l = (LinearLayout) 
            inflater.inflate(R.layout.mf, container, false);

    int pos = this.getArguments().getInt("pos");
    TextView tv = (TextView) l.findViewById(R.id.text);
    tv.setText("Product " + pos);


    /*
     * Put images with Hard-Coding
     */
    if (pos == 0) {
        ImageView product_photo = (ImageView) l.findViewById(R.id.myoffer_image);
        product_photo.setImageResource(R.drawable.myoffers_0);
        Toast.makeText(this.getActivity(), "Product" + pos + " is selected.", Toast.LENGTH_LONG).show();
        start_websocket(pos);
    }

    else if (pos == 1) {
        ImageView product_photo = (ImageView) l.findViewById(R.id.myoffer_image);
        product_photo.setImageResource(R.drawable.myoffers_1);
        Toast.makeText(this.getActivity(), "Product" + pos + " is selected.", Toast.LENGTH_LONG).show();
        start_websocket(pos);
    }


    Myoffers_LinearLayout root = (Myoffers_LinearLayout) l.findViewById(R.id.root);
    float scale = this.getArguments().getFloat("scale");
    root.setScaleBoth(scale);

    return l;

}

我改变了它，就像下面的代码一样..

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    if (container == null) {
        return null;
    }


    LinearLayout l = (LinearLayout) 
            inflater.inflate(R.layout.mf, container, false);

    int pos = this.getArguments().getInt("pos");
    TextView tv = (TextView) l.findViewById(R.id.text);
    tv.setText("Product " + pos);


    /*
     * Put images with Hard-Coding
     */

    ImageView product_photo = (ImageView) l.findViewById(R.id.myoffer_image);

    switch(pos){
    case 0:
        product_photo.setImageResource(R.drawable.myoffers_0);
        Toast.makeText(this.getActivity(), "Product" + pos + " is selected.", Toast.LENGTH_LONG).show();
        start_websocket(pos);
        break;

    case 1:
        product_photo.setImageResource(R.drawable.myoffers_1);
        Toast.makeText(this.getActivity(), "Product" + pos + " is selected.", Toast.LENGTH_LONG).show();
        start_websocket(pos);
        break;

    }

但是，这一行出现了错误......

• 覆盖android.support.v4.app.Fragment.onCreateView

• 此方法必须返回View

  类型的结果

  public View onCreateView（LayoutInflater inflater，ViewGroup container，Bundle savedInstanceState）

你能给我正确的代码转换方法吗？ 谢谢。