Question

我是Android的新手，我正在开展一个项目，我需要自定义一些视图。我需要从一些类imageview类中夸大的布局中获得一些BaseAdapter。当我尝试：

ImageView imageView = (ImageView) getView(R.layout.user_list_item).findViewById(R.id.iv_avatar);

我收到错误，因为在BaseAdapter课程中有

@Override
  public View getView(final int position, View convertView,
      final ViewGroup parent) {
    if (convertView == null)
      convertView = initialize(inflater.inflate(layout, null));
      try {
          update(position, convertView, getItem(position));
      } catch (IOException e) {
          e.printStackTrace();
      }
      return convertView;
  }

如何获得此ImageView？我也尝试了View view = getLayoutInflater().inflate(R.layout.user_list_item)，但它无法正常工作

以下是视图的初始化方式

public class UserListAdapter extends SingleTypeAdapter<User> {


    public UserListAdapter(LayoutInflater inflater, List<User> items) {
        super(inflater, R.layout.user_list_item);

        setItems(items);
    }

和这个方法

@Override
    protected int[] getChildViewIds() {
        return new int[] { R.id.iv_avatar, R.id.tv_name };
    }

至于SingleTypeAdapter，就像这样

public abstract class SingleTypeAdapter<V> extends TypeAdapter {

  private static final Object[] EMPTY = new Object[0];

  private final LayoutInflater inflater;

  private final int layout;

  private final int[] children;

  private Object[] items;

  /**
   * Create adapter
   *
   * @param activity
   * @param layoutResourceId
   */
  public SingleTypeAdapter(final Activity activity, final int layoutResourceId) {
    this(activity.getLayoutInflater(), layoutResourceId);
  }

  /**
   * Create adapter
   *
   * @param context
   * @param layoutResourceId
   */
  public SingleTypeAdapter(final Context context, final int layoutResourceId) {
    this(LayoutInflater.from(context), layoutResourceId);
  }

  /**
   * Create adapter
   *
   * @param inflater
   * @param layoutResourceId
   */
  public SingleTypeAdapter(final LayoutInflater inflater,
      final int layoutResourceId) {
    this.inflater = inflater;
    this.layout = layoutResourceId;

    items = EMPTY;

    int[] childIds = getChildViewIds();
    if (childIds == null)
      childIds = new int[0];
    children = childIds;
  }

Answer 1

试试这个：

 ImageView imageView = (ImageView) convertView.findViewById(R.id.iv_avatar);

Answer 2

我不是Android的专业人士，但你可以尝试以下方法：

添加SingleAdpaterClass

protected Activity activist = null;

并在SingleTypeAdapter适配器方法中添加：

public SingleTypeAdapter(final Activity activity, final int layoutResourceId) {
    this(activity.getLayoutInflater(), layoutResourceId);
    activist = activity;
  }

这允许您在Activity类中获取UserListAdapter实例，然后您可以获得一些视图

View view = activist.getLayoutInflater().inflate(R.layout.user_list_item);

Answer 3

convertView = inflater.inflate(R.layout.user_list_item, null);

ImageView imageView = (ImageView) convertView.findViewById(R.id.iv_avatar);

如何在活动类之外获取视图

3 个答案: