带有自定义令牌的Android MultiAutoCompleteTextView，如whatsapp GroupChat

Question

我想为@ like as whatspp特性创建自定义标记器(当打开组和写@然后打开弹出列表，用户可以选择任何选项)。此外，用户还可以删除@的字符串。

我已经找到了类似于搜索功能(示例)的twitter，但是在这个时候，当用户可以写@时，不要显示列表的弹出窗口。用户可以在@之后写一些东西，然后根据输入，弹出窗口将显示搜索结果。

我想展示这样的东西：

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Answer 1

我为我的问题找到了答案。

我为多自动完成文本视图创建了自己的自定义视图，并在@签名之后添加了打开弹出的performFiltering方法。

public class KcsMultiAutoCompleteTextView extends MultiAutoCompleteTextView {
    public KcsMultiAutoCompleteTextView(Context context) {
        super(context);
    }

    public KcsMultiAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public KcsMultiAutoCompleteTextView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void performFiltering(CharSequence text, int start, int end, int keyCode) {
        if (text.charAt(start) == '@') {
            start = start + 1;
        } else {
            text = text.subSequence(0, start);
            for (int i = start; i < end; i++) {
                text = text + "*";
            }
        }
        super.performFiltering(text, start, end, keyCode);
    }

}

Answer 2

请看TokenAutoComplete，我希望它能帮上忙

Answer 3

今天我在找这个。我使用了android-多自动完成库。检查与图书馆提供的演示。简而言之，您必须从库中扩展两个类，一个tokenFilter (描述您的模式，在本例中是@字符)和一个ViewBinder (用于自定义建议行，例如将用户图像放置在特定位置等)。所以对我来说，这是TokenFilter：

import androidx.annotation.NonNull;
import ridmik.one.entities.MucOptions;
import ridmik.one.ui.components.autocomplete.filter.HandleTokenFilter;

public class MucUserTokenFilter extends HandleTokenFilter<MucOptions.User> {

  public MucUserTokenFilter() {
    this('@');
  }
  public MucUserTokenFilter(char handleChar) {
    super(handleChar);
  }

  @Override
  protected boolean matchesConstraint(@NonNull MucOptions.User user, @NonNull CharSequence constraint) {
    return user.getComparableName().toLowerCase().contains(constraint.toString().toLowerCase());
  }

  @Override
  public @NonNull CharSequence toTokenString(@NonNull MucOptions.User user) {
    return handleChar +user.getComparableName(); // Add handler at the begining! this is the trick!
  }
}

这是ViewBinder

public class MucUserViewBinder implements AutoCompleteViewBinder<MucOptions.User> {
  public static final String TAG = MucUserViewBinder.class.getSimpleName();
  @Override
  public long getItemId(@NonNull @NotNull MucOptions.User user) {
    try{
      if(user!=null) {
        return user.userId;  // ei line e crash kore :/
      }
    }catch (Exception x) {
      Timber.tag(TAG).e("Exception "+x.getMessage());
    }


    return 0;
  }

  @Override
  public int getItemLayoutId() {
    return R.layout.simple_autocomplete_row;
  }

  @NonNull
  @NotNull
  @Override
  public AutoCompleteViewHolder getViewHolder(@NonNull @NotNull View view) {
    return new MucUserViewHolder(view);
  }

  @Override
  public void bindData(@NonNull @NotNull AutoCompleteViewHolder viewHolder, @NonNull @NotNull MucOptions.User user,
                       @Nullable @org.jetbrains.annotations.Nullable CharSequence constraint) {
    MucUserViewHolder itemViewHolder = (MucUserViewHolder) viewHolder;
    itemViewHolder.textView.setText(user.getComparableName());
    String smallAvatar = user.image + "_sm.png";
    Timber.tag(TAG).e("user.image = "+smallAvatar);
    Picasso.get().load(smallAvatar)
        .placeholder(ContextCompat.getDrawable(itemViewHolder.rootView.getContext(),
            R.drawable.ic_avatar_placeholder)).into(itemViewHolder.avatar);
  }

  static class MucUserViewHolder extends AutoCompleteViewHolder {
    public final TextView textView;
    public final CircleImageView avatar;
    public final View rootView;

    protected MucUserViewHolder(@NonNull @NotNull View view) {
      super(view);
      this.rootView = view;
      this.textView = view.findViewById(R.id.textView);
      this.avatar = view.findViewById(R.id.avatar);
    }
  }
}

在此之后，您将进入您的活动/片段，并执行以下操作：

private MultiAutoComplete multiAutoComplete = null; // A field in your Activity / Fragment class, initialize it to null.

void initAutoSuggestions() {
  
ArrayList<MucOptions.User> someList = getUsers(); // <--- suggestions dataset depending on your code.
        AutoCompleteTypeAdapter<MucOptions.User> nameTypeAdapter =
            AutoCompleteTypeAdapter.Build.from(new MucUserViewBinder(), new MucUserTokenFilter());


        nameTypeAdapter.setItems(someList);

        this.multiAutoComplete = new MultiAutoComplete.Builder()
            .tokenizer(new PrefixTokenizer('@'))
            .addTypeAdapter(nameTypeAdapter)
            // .delayer(constraint -> { return 10; }) // eta ki bujhi ni
            .build();
        
        this.multiAutoComplete.onViewAttached(binding.textinput); // binding.textinput is your multiAutoCompleteView 
}

然后在onCreate (用于活动)或onViewCreated (用于片段)中调用它。最后，在onDestroy内部：

    @Override
    public void onDestroy() {
        super.onDestroy();
          if(multiAutoComplete!=null) {
            this.multiAutoComplete.onViewDetached(); // needed for @mention that thing
        }
}

您还可以在库中查看Demo以查看其他选项。