此代码如何工作？

debugcn 发表于 Dev

用户名

我已经从一个教程中编写了这段代码。

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
    // TODO Auto-generated method stub
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View row = inflater.inflate(R.layout.single_row, viewGroup,false);

    TextView title = (TextView) row.findViewById(R.id.txtTitle);
    TextView description = (TextView) row.findViewById(R.id.txtDescription);
    ImageView image = (ImageView) row.findViewById(R.id.imgPic);

    SingleRow temp = list.get(i);

    title.setText(temp.title);
    description.setText(temp.description);
    image.setImageResource(temp.image);


    return row;
}

在这行代码中：

TextView title = (TextView) row.findViewById(R.id.txtTitle);

我认为TextView被复制到相同类型的变量。然后在这行代码中：

title.setText(temp.title);

我们用一些东西填充那个变量。然后返回作为View且与'title'变量无关的行变量。
怎么运行的？我认为这些变量与此处无关。

卡米特埃尔

这段代码会膨胀一个新视图，并对其内容进行设置。这意味着您正在以编程方式创建新视图。它经常被使用，例如，在填充列表时，您将拥有许多行，每行的结构相同，但具有不同的值。

下面是它的工作原理：

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
    // Get the inflater service
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    // Inflate view with ID = R.layout.single_row into the row variable
    View row = inflater.inflate(R.layout.single_row, viewGroup,false);

    // Get child views of row: title, description and image.
    TextView title = (TextView) row.findViewById(R.id.txtTitle);
    TextView description = (TextView) row.findViewById(R.id.txtDescription);
    ImageView image = (ImageView) row.findViewById(R.id.imgPic);

    // This get's some template view which will provide data: title, description and image
    SingleRow temp = list.get(i);

    // Here you're setting title, description and image by using values from `temp`.
    title.setText(temp.title);
    description.setText(temp.description);
    image.setImageResource(temp.image);

    // Return the view with all values set. This view will be later probably added somewhere as a child (maybe into a list?)
    return row;
}

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