我想更改AutoCompleteTextView中的默认过滤.默认筛选查找以给定标记开始的所有字符串.我的项目要求过滤应该找到包含给定标记的所有字符串.

可能吗？

我找到了一个解决方案,感谢Google和搜索两天.正如@ torque203建议的那样,我已经实现了自己的自定义适配器.首先在适配器中为自定义Item定义一个新的 XML文件：

autocomplete_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Medium Text"
        android:paddingLeft="8dp"
        android:paddingRight="8dp"
        android:paddingTop="16dp"
        android:paddingBottom="16dp"
        android:id="@+id/lbl_name" />
</RelativeLayout>

为您的名称创建新类：

名称

public class Names {
    public String name;
}

NamesAdapter

public class NamesAdapter extends ArrayAdapter<Names> {

    Context context;
    int resource,textViewResourceId;
    List<Names> items,tempItems,suggestions;

    public NamesAdapter(Context context,int resource,int textViewResourceId,List<Names> items) {
        super(context,resource,textViewResourceId,items);
        this.context = context;
        this.resource = resource;
        this.textViewResourceId = textViewResourceId;
        this.items = items;
        tempItems = new ArrayList<Names>(items); // this makes the difference.
        suggestions = new ArrayList<Names>();
    }

    @Override
    public View getView(int position,View convertView,ViewGroup parent) {
        View view = convertView;
        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.autocomplete_item,parent,false);
        }
        Names names = items.get(position);
        if (names != null) {
            TextView lblName = (TextView) view.findViewById(R.id.lbl_name);
            if (lblName != null)
                lblName.setText(names.name);
        }
        return view;
    }

    @Override
    public Filter getFilter() {
        return nameFilter;
    }

    /**
     * Custom Filter implementation for custom suggestions we provide.
     */
    Filter nameFilter = new Filter() {
        @Override
        public CharSequence convertResultToString(Object resultValue) {
            String str = ((Names) resultValue).name;
            return str;
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if (constraint != null) {
                suggestions.clear();
                for (Names names : tempItems) {
                    if (names.name.toLowerCase().contains(constraint.toString().toLowerCase())) {
                        suggestions.add(names);
                    }
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = suggestions;
                filterResults.count = suggestions.size();
                return filterResults;
            } else {
                return new FilterResults();
            }
        }

        @Override
        protected void publishResults(CharSequence constraint,FilterResults results) {
            List<Names> filterList = (ArrayList<Names>) results.values;
            if (results != null && results.count > 0) {
                clear();
                for (Names names : filterList) {
                    add(names);
                    notifyDataSetChanged();
                }
            }
        }
    };
}

SearchActivity(或您的主要活动)

....
   List<Names> namesList =  //your names list;
   NamesAdapter namesAdapter = new NamesAdapter(
                    SearchActivity.this,R.layout.activity_search,R.id.lbl_name,namesList
            );
            //set adapter into listStudent
            autoCompleteTextView.setAdapter(namesAdapter);
            autoCompleteTextView.showDropDown();
...

根据文档,CTFramesetterSuggestFrameSizeWithConstraints()“确定字符串范围所需的帧大小”.

不幸的是,这个函数返回的大小永远不准确.这是我在做的事情：

NSAttributedString *string = [[[NSAttributedString alloc] initWithString:@"lorem ipsum" attributes:nil] autorelease];
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString((CFAttributedStringRef) string);
    CGSize textSize = CTFramesetterSuggestFrameSizeWithConstraints(framesetter,CFRangeMake(0,0),NULL,CGSizeMake(rect.size.width,CGFLOAT_MAX),NULL);

返回的大小始终具有正确的宽度计算,但高度始终略短于预期.

这是使用此方法的正确方法吗？

有没有其他方法来布局核心文本？

似乎我不是唯一遇到此方法问题的人.见https://devforums.apple.com/message/181450.

编辑：
我使用sizeWithFont：使用Quartz测量相同的字符串,为属性字符串和Quartz提供相同的字体.以下是我收到的测量数据：

Core Text: 133.569336 x 16.592285

Quartz: 135.000000 x 31.000000

试试这..似乎工作：

+(CGFloat)heightForAttributedString:(NSAttributedString *)attrString forWidth:(CGFloat)inWidth
{
    CGFloat H = 0;

    // Create the framesetter with the attributed string.
    CTFramesetterRef framesetter = CTFramesetterCreateWithAttributedString( (CFMutableAttributedStringRef) attrString); 

    CGRect Box = CGRectMake(0,inWidth,CGFLOAT_MAX);

    CFIndex startIndex = 0;

    CGMutablePathRef path = CGPathCreateMutable();
    CGPathAddRect(path,Box);

    // Create a frame for this column and draw it.
    CTFrameRef frame = CTFramesetterCreateFrame(framesetter,CFRangeMake(startIndex,path,NULL);

    // Start the next frame at the first character not visible in this frame.
    //CFRange frameRange = CTFrameGetVisibleStringRange(frame);
    //startIndex += frameRange.length;

    CFArrayRef lineArray = CTFrameGetLines(frame);
    CFIndex j = 0,lineCount = CFArrayGetCount(lineArray);
    CGFloat h,ascent,descent,leading;

    for (j=0; j < lineCount; j++)
    {
        CTLineRef currentLine = (CTLineRef)CFArrayGetValueAtIndex(lineArray,j);
        CTLineGetTypographicBounds(currentLine,&ascent,&descent,&leading);
        h = ascent + descent + leading;
        NSLog(@"%f",h);
        H+=h;
    }

    CFRelease(frame);
    CFRelease(path);
    CFRelease(framesetter);


    return H;
}