Android開發人員如何下划線和更改字符串中單詞的顏色，例如鏈接顏色

Question

我有一個從數據庫獲取字符串並將其設置為標簽的應用程序。 現在，我希望該標簽下划線一個單詞，例如“該單詞下划線”。 我希望能夠單擊該下划線單詞並獲得其價值。 因此，在將其發送到數據庫之前或之后，是否要對其進行設置。 謝謝你的幫助。 我在下面嘗試了代碼，由於for循環，每一行都突出顯示。 請幫忙

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，所以您需要做一些事情。 他們通過使用TextView內部的span來實現此目的。

首先，您需要一個擴展ClickableSpan的類：

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;
    }
}

在您的活動中，您將像這樣設置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，您將需要一個處理程序來處理跨度上的click事件：

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"
    }
};

希望這可以幫助。