安卓ClickableSpan不改变风格点击
安卓ClickableSpan不改变风格点击
提问于 2016-06-22 19:56:35
我有一个TextView，所有的单词都可以单独点击。我想从每一个没有风格的词开始。单击一个单词时，该词应该成为并保持下划线。我可以清除默认下划线，但没有发生任何点击。(我正在捕捉甚至处理单击，但我无法更改Span样式)。
相关代码如下。提前谢谢你的帮助。
自定义ClickableSpan：
class WordSpan extends ClickableSpan {
private TextPaint textpaint;
public boolean clicked = false;
@Override
public void updateDrawState(TextPaint ds) {
textpaint = ds;
ds.setUnderlineText(false);
if (clicked)
ds.setUnderlineText(true);
}
@Override
public void onClick(View v) {}
public void setClicked(boolean c) {
clicked = c;
updateDrawState(textpaint);
}
}在onCreate()中，我解析一个txt文件并将每个单词添加到TextView中。在这个解析循环中，我有以下代码：
SpannableString ss = new SpannableString(word.toString());
WordSpan clickableSpan = new WordSpan() {
@Override
public void onClick(View view) {
setClicked(true);
view.invalidate();
}};
ss.setSpan(clickableSpan, 0, word.toString().length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
tvText.append(ss);
tvText.append(" ");
}
tvText.setMovementMethod(LinkMovementMethod.getInstance());Stack Overflow用户
回答已采纳
发布于 2016-06-28 17:56:24
要使单个单词可点击，您必须向可扩展字符串中添加多个可单击跨度。例如，要使"foo“和"bar”在单个Textview中单独单击，您必须添加两个可单击的跨度，一个用于"foo“，另一个用于"bar”，并将它们添加到可扩展字符串中。
在本例中，为了简单起见，我使用空格拆分了字符串，另外，您还必须为单击span编写逻辑。
删除下划线的可点击范围。此外，您还可以配置背景和文本的颜色单击。如果你不打算使用它，你可以移除它。
import android.text.TextPaint;
import android.text.style.ClickableSpan;
public abstract class TouchableSpan extends ClickableSpan {
private boolean mIsPressed;
private int mPressedBackgroundColor;
private int mNormalTextColor;
private int mPressedTextColor;
private int mBackgroundColor;
public TouchableSpan(int normalTextColor,int backgroundColor, int pressedTextColor, int pressedBackgroundColor) {
mBackgroundColor = backgroundColor;
mNormalTextColor = normalTextColor;
mPressedTextColor = pressedTextColor;
mPressedBackgroundColor = pressedBackgroundColor;
}
public void setPressed(boolean isSelected) {
mIsPressed = isSelected;
}
@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
ds.setColor(mIsPressed ? mPressedTextColor : mNormalTextColor);
ds.bgColor = mIsPressed ? mPressedBackgroundColor : mBackgroundColor;
ds.setUnderlineText(!mIsPressed);
}
}创建一个LinkMovementMethod，它将照顾您的跨度。如果您删除颜色规定，您也可以改变这一点。
import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.method.LinkMovementMethod;
import android.text.method.MovementMethod;
import android.view.MotionEvent;
import android.widget.TextView;
public class LinkTouchMovementMethod extends LinkMovementMethod {
private TouchableSpan mPressedSpan;
@Override
public boolean onTouchEvent(TextView textView, Spannable spannable, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mPressedSpan = getPressedSpan(textView, spannable, event);
if (mPressedSpan != null) {
mPressedSpan.setPressed(true);
Selection.setSelection(spannable, spannable.getSpanStart(mPressedSpan),
spannable.getSpanEnd(mPressedSpan));
}
} else if (event.getAction() == MotionEvent.ACTION_MOVE) {
TouchableSpan touchedSpan = getPressedSpan(textView, spannable, event);
if (mPressedSpan != null && touchedSpan != mPressedSpan) {
mPressedSpan.setPressed(false);
mPressedSpan = null;
Selection.removeSelection(spannable);
}
} else {
if (mPressedSpan != null) {
mPressedSpan.setPressed(false);
super.onTouchEvent(textView, spannable, event);
}
mPressedSpan = null;
Selection.removeSelection(spannable);
}
return true;
}
private TouchableSpan getPressedSpan(TextView textView, Spannable spannable, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
x -= textView.getTotalPaddingLeft();
y -= textView.getTotalPaddingTop();
x += textView.getScrollX();
y += textView.getScrollY();
Layout layout = textView.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);
TouchableSpan[] link = spannable.getSpans(off, off, TouchableSpan.class);
TouchableSpan touchedSpan = null;
if (link.length > 0) {
touchedSpan = link[0];
}
return touchedSpan;
}
}然后，您可以以下列方式使用它：
TextView textView = (TextView)findViewById(R.id.hello_world);
String fooBar = "asdfasdfasdfasf asdfasfasfasd";
String[] clickSpans = fooBar.split(" ");
int clickSpanLength = clickSpans.length;
SpannableStringBuilder spannableStringBuilder = new SpannableStringBuilder();
int totalLength = 0;
int normalColor = getResources().getColor(android.R.color.black);
int clickColor = getResources().getColor(android.R.color.holo_blue_bright);
String separator = " , ";
int separatorLength = separator.length();
for (int i = 0; i < clickSpanLength; i++) {
int currentWordLength = clickSpans[i].length();
spannableStringBuilder.append(clickSpans[i]);
if (i < clickSpanLength - 1) {
spannableStringBuilder.append(" , ");
}
spannableStringBuilder.setSpan(new TouchableSpan(normalColor, Color.TRANSPARENT, clickColor, Color.TRANSPARENT) {
@Override
public void onClick(View widget) {
}
}, totalLength, totalLength + currentWordLength, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
totalLength = totalLength + currentWordLength + separatorLength;
}
textView.setText(spannableStringBuilder);
textView.setMovementMethod(new LinkTouchMovementMethod());页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/37977148
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