我遇到了TextView的问题。我可以使用setTextIsSelectable(true)选择它，但是当我通过setMovementMethod(LinkMovementMethod.getInstance())启用链接时，它就不再可以选择了。
请注意，我并不是说可以点击原始链接，而是通过使用TextView之类的内容加载带有HTML标记的setText(Html.fromHtml("<a href='http://stackoverflow.com'>Hello World!</a>"))来使实际单词可以点击。
答案 0 :(得分：25)
oakes's在文本视图上双击导致异常
java.lang.IndexOutOfBoundsException: setSpan (-1 ... -1) starts before 0...
我查看了 LinkMovementMethod 中的 onTouchEvent 实现，发现当textview不包含链接时会删除选择。在这种情况下，当用户尝试更改时，选择从空值开始，应用程序崩溃。
...
if (link.length != 0) {
if (action == MotionEvent.ACTION_UP) {
link[0].onClick(widget);
} else if (action == MotionEvent.ACTION_DOWN) {
Selection.setSelection(buffer,
buffer.getSpanStart(link[0]),
buffer.getSpanEnd(link[0]));
}
return true;
} else {
Selection.removeSelection(buffer);
}
...
所以我重写 onTouchEvent 方法，它运行正常。
public class CustomMovementMethod extends LinkMovementMethod {
@Override
public boolean canSelectArbitrarily () {
return true;
}
@Override
public void initialize(TextView widget, Spannable text) {
Selection.setSelection(text, text.length());
}
@Override
public void onTakeFocus(TextView view, Spannable text, int dir) {
if ((dir & (View.FOCUS_FORWARD | View.FOCUS_DOWN)) != 0) {
if (view.getLayout() == null) {
// This shouldn't be null, but do something sensible if it is.
Selection.setSelection(text, text.length());
}
} else {
Selection.setSelection(text, text.length());
}
}
@Override
public boolean onTouchEvent(TextView widget, Spannable buffer,
MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_UP ||
action == MotionEvent.ACTION_DOWN) {
int x = (int) event.getX();
int y = (int) event.getY();
x -= widget.getTotalPaddingLeft();
y -= widget.getTotalPaddingTop();
x += widget.getScrollX();
y += widget.getScrollY();
Layout layout = widget.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);
ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class);
if (link.length != 0) {
if (action == MotionEvent.ACTION_UP) {
link[0].onClick(widget);
} else if (action == MotionEvent.ACTION_DOWN) {
Selection.setSelection(buffer,
buffer.getSpanStart(link[0]),
buffer.getSpanEnd(link[0]));
}
return true;
}
}
return Touch.onTouchEvent(widget, buffer, event);
}
}
希望对某人有所帮助。
答案 1 :(得分：14)
我明白了。您需要子类化LinkMovementMethod并添加对文本选择的支持。非常不幸的是，它本身并不支持它。我只是使用source code ArrowKeyMovementMethod中的等效方法来覆盖相关方法。我想这是Android开源的一个好处！
public class CustomMovementMethod extends LinkMovementMethod {
@Override
public boolean canSelectArbitrarily () {
return true;
}
@Override
public void initialize(TextView widget, Spannable text) {
Selection.setSelection(text, text.length());
}
@Override
public void onTakeFocus(TextView view, Spannable text, int dir) {
if ((dir & (View.FOCUS_FORWARD | View.FOCUS_DOWN)) != 0) {
if (view.getLayout() == null) {
// This shouldn't be null, but do something sensible if it is.
Selection.setSelection(text, text.length());
}
} else {
Selection.setSelection(text, text.length());
}
}
}
要使用它，只需直接实例化它，如下所示：
textView.setMovementMethod(new CustomMovementMethod());
答案 2 :(得分：2)
LinkMovementMethod()不支持文本选择，即使我们可以选择文本，但在滚动文本视图后，选择将会丢失。
最佳实现是从ArrowKeyMovementMethod扩展，它非常好地支持文本选择。
请参阅here
中的详细信息答案 3 :(得分：1)
XML TextView不应包含任何可以选择的链接或任何属性：
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
然后，按照以下顺序以编程方式设置所有内容：
textView.setText(Html.fromHtml(myHtml));
Linkify.addLinks(textView, Linkify.WEB_URLS);
textView.setTextIsSelectable(true); // API-11 and above
textView.setMovementMethod(LinkMovementMethod.getInstance());
答案 4 :(得分：0)
TL; DR：只需在此答案末尾使用LinkArrowKeyMovementMethod即可获得完美的解决方案。
如果您尝试使用扩展了LinkMovementMethod的投票最多的答案，就会遇到一个烦人的错误-当您通过单击一些未选中的文本来取消选择时，整个选择会闪烁开始到选择结束，然后什么都没有。这是因为LinkMovementMethod实际上无法处理与ArrowKeyMovementMethod一样好的选择。
如果您将TextView设置为android:autoLink，则可以使用true自己的解决方法，如以下TextView所示：
final boolean textIsSelectable = isTextSelectable();
if (touchIsFinished && mLinksClickable && mAutoLinkMask != 0 && textIsSelectable) {
// The LinkMovementMethod which should handle taps on links has not been installed
// on non editable text that support text selection.
// We reproduce its behavior here to open links for these.
ClickableSpan[] links = ((Spannable) mText).getSpans(getSelectionStart(),
getSelectionEnd(), ClickableSpan.class);
if (links.length > 0) {
links[0].onClick(this);
handled = true;
}
}
但是我个人不希望使用自动链接功能（我有自己的链接信息），因此基于@Weidian Huang的想法，我将LinkMovementMethod的功能合并到ArrowKeyMovementMethod中，并且建立了一种新的移动方法：
/**
* @see LinkMovementMethod
* @see ArrowKeyMovementMethod
*/
public class LinkArrowKeyMovementMethod extends ArrowKeyMovementMethod {
private static final int CLICK = 1;
private static final int UP = 2;
private static final int DOWN = 3;
private static Object FROM_BELOW = new NoCopySpan.Concrete();
private static LinkArrowKeyMovementMethod sInstance;
public static LinkArrowKeyMovementMethod getInstance() {
if (sInstance == null) {
sInstance = new LinkArrowKeyMovementMethod();
}
return sInstance;
}
@Override
public void initialize(TextView widget, Spannable text) {
super.initialize(widget, text);
text.removeSpan(FROM_BELOW);
}
@Override
public void onTakeFocus(TextView view, Spannable text, int dir) {
super.onTakeFocus(view, text, dir);
if ((dir & View.FOCUS_BACKWARD) != 0) {
text.setSpan(FROM_BELOW, 0, 0, Spannable.SPAN_POINT_POINT);
} else {
text.removeSpan(FROM_BELOW);
}
}
@Override
protected boolean handleMovementKey(TextView widget, Spannable buffer, int keyCode,
int movementMetaState, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:
if (KeyEvent.metaStateHasNoModifiers(movementMetaState)) {
if (event.getAction() == KeyEvent.ACTION_DOWN &&
event.getRepeatCount() == 0 && action(CLICK, widget, buffer)) {
return true;
}
}
break;
}
return super.handleMovementKey(widget, buffer, keyCode, movementMetaState, event);
}
@Override
protected boolean up(TextView widget, Spannable buffer) {
if (action(UP, widget, buffer)) {
return true;
}
return super.up(widget, buffer);
}
@Override
protected boolean down(TextView widget, Spannable buffer) {
if (action(DOWN, widget, buffer)) {
return true;
}
return super.down(widget, buffer);
}
@Override
protected boolean left(TextView widget, Spannable buffer) {
if (action(UP, widget, buffer)) {
return true;
}
return super.left(widget, buffer);
}
@Override
protected boolean right(TextView widget, Spannable buffer) {
if (action(DOWN, widget, buffer)) {
return true;
}
return super.right(widget, buffer);
}
private boolean action(int what, TextView widget, Spannable buffer) {
Layout layout = widget.getLayout();
int padding = widget.getTotalPaddingTop() +
widget.getTotalPaddingBottom();
int areaTop = widget.getScrollY();
int areaBot = areaTop + widget.getHeight() - padding;
int lineTop = layout.getLineForVertical(areaTop);
int lineBot = layout.getLineForVertical(areaBot);
int first = layout.getLineStart(lineTop);
int last = layout.getLineEnd(lineBot);
ClickableSpan[] candidates = buffer.getSpans(first, last, ClickableSpan.class);
int a = Selection.getSelectionStart(buffer);
int b = Selection.getSelectionEnd(buffer);
int selStart = Math.min(a, b);
int selEnd = Math.max(a, b);
if (selStart < 0) {
if (buffer.getSpanStart(FROM_BELOW) >= 0) {
selStart = selEnd = buffer.length();
}
}
if (selStart > last)
selStart = selEnd = Integer.MAX_VALUE;
if (selEnd < first)
selStart = selEnd = -1;
switch (what) {
case CLICK:
if (selStart == selEnd) {
return false;
}
ClickableSpan[] link = buffer.getSpans(selStart, selEnd, ClickableSpan.class);
if (link.length != 1)
return false;
link[0].onClick(widget);
break;
case UP:
int bestStart, bestEnd;
bestStart = -1;
bestEnd = -1;
for (int i = 0; i < candidates.length; i++) {
int end = buffer.getSpanEnd(candidates[i]);
if (end < selEnd || selStart == selEnd) {
if (end > bestEnd) {
bestStart = buffer.getSpanStart(candidates[i]);
bestEnd = end;
}
}
}
if (bestStart >= 0) {
Selection.setSelection(buffer, bestEnd, bestStart);
return true;
}
break;
case DOWN:
bestStart = Integer.MAX_VALUE;
bestEnd = Integer.MAX_VALUE;
for (int i = 0; i < candidates.length; i++) {
int start = buffer.getSpanStart(candidates[i]);
if (start > selStart || selStart == selEnd) {
if (start < bestStart) {
bestStart = start;
bestEnd = buffer.getSpanEnd(candidates[i]);
}
}
}
if (bestEnd < Integer.MAX_VALUE) {
Selection.setSelection(buffer, bestStart, bestEnd);
return true;
}
break;
}
return false;
}
@Override
public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
int action = event.getAction();
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_DOWN) {
int x = (int) event.getX();
int y = (int) event.getY();
x -= widget.getTotalPaddingLeft();
y -= widget.getTotalPaddingTop();
x += widget.getScrollX();
y += widget.getScrollY();
Layout layout = widget.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);
ClickableSpan[] links = buffer.getSpans(off, off, ClickableSpan.class);
if (links.length != 0) {
if (action == MotionEvent.ACTION_UP) {
links[0].onClick(widget);
} else if (action == MotionEvent.ACTION_DOWN) {
Selection.setSelection(buffer,
buffer.getSpanStart(links[0]),
buffer.getSpanEnd(links[0]));
}
return true;
}
// Removed
//else {
// Selection.removeSelection(buffer);
//}
}
return super.onTouchEvent(widget, buffer, event);
}
}
要使用它，只需调用：
textView.setTextIsSelectable(true);
textView.setMovementMethod(LinkArrowKeyMovementMethod.getInstance());
这对我来说很完美。
答案 5 :(得分：0)
另外，订单很重要
textView.setTextIsSelectable(true);
textView.setMovementMethod(LinkMovementMethod.getInstance());
允许选择内容，并且链接点击效果完美
答案 6 :(得分：0)
这是我对Kotlin的看法（基于@ hai-zhang的回答）。 简体！见我的要旨以获得更好的版本。我目前将其用于自定义范围，而不是HTML，它对我来说仍然很重要，尤其是当我需要将用户点击的位置传递给范围对象时。
您需要在之后 setTextIsSelectable（true）设置移动方法
/** Minimal version of Smart Movement that only has limited support of [ClickableSpan] */
object SmartMovementMethodMinimal : ArrowKeyMovementMethod() {
override fun onTouchEvent(widget: TextView?, buffer: Spannable?, event: MotionEvent?) =
handleMotion(event!!, widget!!, buffer!!) || super.onTouchEvent(widget, buffer, event)
private fun handleMotion(event: MotionEvent, widget: TextView, buffer: Spannable): Boolean {
if (event.action == MotionEvent.ACTION_UP) {
// Get click position
val target = Point().apply {
x = event.x.toInt() - widget.totalPaddingLeft + widget.scrollX
y = event.y.toInt() - widget.totalPaddingTop + widget.scrollY
}
// Get span line and offset
val line = widget.layout.getLineForVertical(target.y)
val offset = widget.layout.getOffsetForHorizontal(line, target.x.toFloat())
if (event.action == MotionEvent.ACTION_UP) {
val spans = buffer.getSpans<ClickableSpan>(offset, offset)
if (spans.isNotEmpty()) {
spans.forEach { it.onClick(widget) }
return true
}
}
}
return false
}
}
更详细，更复杂的代码，并在此处提供示例：https://gist.github.com/sQu1rr/210f7e08dd939fa30dcd2209177ba875
答案 7 :(得分：-1)
是否可以将TextView与URL相关联？ 您是否有10个TextView和10个URL，编写代码应该很简单，如果单击TextView [3]，它会使用URL [3]
触发webview（或浏览器）的意图