Question

我有一个应用程序从数据库中获取字符串并设置为标签。现在我希望这个标签能够强调一个词，例如“这个词应该加下划线”。我希望能够点击该下划线词并获得其价值。所以我在将其发送到数据库之前或之后进行设置。谢谢你的帮助。我尝试下面的代码，因为for循环，每一行都突出显示。请帮忙

SpannableStringBuilder builder = new SpannableStringBuilder();
            for(int i=0;i<ListClass.getLatestActivity().size();i++){
                String myString  = ListClass.getLatestActivity().get(i);
                builder.append(myString);
                String substringThatShouldBeClickable = myString.substring(0,myString.indexOf(' ')).trim();
                MySpan span = new MySpan(substringThatShouldBeClickable);
                span.setOnMySpanClickListener(mySpanOnClickListener);

                int start = 0;
                int end = builder.length();

                builder.setSpan(span, start, end, 0);
                builder.append("\n" + "\n") ;
            }
            RAInfo.setText(builder);    
            RAInfo.setMovementMethod(LinkMovementMethod.getInstance());

Answer 1

好的，所以你需要做一些事情。他们实现这一目标的方法是在TextView中使用span。

首先，您需要一个扩展ClickableSpan的类：

public class MySpan extends ClickableSpan {
    public interface OnMySpanClickListener {
            public void onMySpanClick(String tag);
    }

    private final String myData;
    private OnMySpanClickListener mOnMySpanClickListener;

    public MySpan(String tag) {
            super();
            if (tag == null) {
                    throw new NullPointerException();
            }
            myData = tag;
    }

    @Override
    public void onClick(View widget) {
            if (mOnMySpanClickListener != null) {
                mOnMySpanClickListener.onMySpanClick(myData);
            }
    }

    public OnMySpanClickListener getOnMySpanClickListener() {
            return mOnMySpanClickListener;
    }

    public void setOnMySpanClickListener(OnMySpanClickListener onMySpanClickListener) {
            mOnMySpanClickListener = onMySpanClickListener;
    }
}

在您的Activity中，您将像这样设置TextView的文本：

String myString = getFromDatabase();    

SpannableStringBuilder builder = new SpannableStringBuilder();
builder.append(myString);

//You'll need to call the constructor for MySpan with only the value of the part
//of the string that you want to work with ("Bob" in the example), however you 
//determine that.
String substringThatShouldBeClickable = getMySubstring(myString);  //"Bob"
MySpan span = new MySpan(substringThatShouldBeClickable);
span.setOnMySpanClickListener(mySpanOnClickListener);

//start and end control the range of characters in the string that are clickable,
//so modify this part so it only underlines the characters you want clickable
int start = 0;
int end = bulider.length();

builder.setSpan(span, start, end, 0);

label.setText(builder);
label.setMovementMethod(LinkMovementMethod.getInstance());

最后，您需要处理span上的点击事件的处理程序：

MySpan.OnMySpanClickListener mySpanOnClickListener = new MySpan.OnMySpanClickListener() {
    public void onMySpanClick(String tag) {
        //Here is where you'll do your work with the value in the String "tag"
    }
};

希望这有帮助。

android dev如何在字符串中加下划线和改变颜色，就像链接颜色一样

1 个答案: