- 当给文字设置clickablespan是，点击时会触发TextView的点击事件
从TextView的源码看起，找到TextView的onTouchEvent的方法
@Override
public boolean onTouchEvent(MotionEvent event) {
final int action = event.getActionMasked();
if (mEditor != null) {
mEditor.onTouchEvent(event);
if (mEditor.mSelectionModifierCursorController != null &&
mEditor.mSelectionModifierCursorController.isDragAcceleratorActive()) {
return true;
}
}
final boolean superResult = super.onTouchEvent(event);
...
final boolean touchIsFinished = (action == MotionEvent.ACTION_UP) &&
(mEditor == null || !mEditor.mIgnoreActionUpEvent) && isFocused();
if ((mMovement != null || onCheckIsTextEditor()) && isEnabled()
&& mText instanceof Spannable && mLayout != null) {
boolean handled = false;
if (mMovement != null) {
handled |= mMovement.onTouchEvent(this, (Spannable) mText, event);
}
final boolean textIsSelectable = isTextSelectable();
if (touchIsFinished && mLinksClickable && mAutoLinkMask != 0 && textIsSelectable) {
ClickableSpan[] links = ((Spannable) mText).getSpans(getSelectionStart(),
getSelectionEnd(), ClickableSpan.class);
if (links.length > 0) {
links[0].onClick(this);
handled = true;
}
}
return superResult;
}
可以看到调用了super.onTouchEvent();，所以会触发TextView的监听事件，接着执行clickablespan的点击事件。
ClickableSpan[] links = ((Spannable) mText).getSpans(getSelectionStart(), getSelectionEnd(), ClickableSpan.class);
if (links.length > 0) {
links[0].onClick(this);
handled = true; }
- 当点击未设置span的textview部分时，发现textview消费了事件，并没有传递给viewgroup
设置clickablespan使设置了一个LinkMovementMethod，看一下LinkMovementMehod的源码
@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;
} else {
Selection.removeSelection(buffer);
}
}
return super.onTouchEvent(widget, buffer, event);
}
可以看到当点击设置了span的textview时return true，如果点击的是没有设置span的text或者空白部分时返回的是一个super.onTouchEvent(); ，这是一个true，也就是默认消费了事件。所以我们要重写LinkMovementMethod中的onTouchEvent，让最后默认返回显式为return false。即不消耗事件，事件继续向上传递。
但是这样修改完之后还是不能解决这个问题，问题出在textview的setMovementMethod方法里面：
public final void setMovementMethod(MovementMethod movement) {
if (mMovement != movement) {
mMovement = movement;
if (movement != null && !(mText instanceof Spannable)) {
setText(mText);
}
fixFocusableAndClickableSettings();
// SelectionModifierCursorController depends on textCanBeSelected, which depends on
// mMovement
if (mEditor != null) mEditor.prepareCursorControllers();
}
}
private void fixFocusableAndClickableSettings() {
if (mMovement != null || (mEditor != null && mEditor.mKeyListener != null)) {
setFocusable(true);
setClickable(true);
setLongClickable(true);
} else {
setFocusable(false);
setClickable(false);
setLongClickable(false);
}
}
可以看到在fixFocusableAndClickableSettings方法里面if(mMovement!=null)时setFocusable、setClickable的值都为true，所以我们需要在setMovementMethod之后再制定这几个值为false。
public class CustomClickMovementMethod extends BaseMovementMethod{
private static CustomClickMovementMethod sInstance;
public static CustomClickMovementMethod getInstance(){
if (sInstance==null){
sInstance = new CustomClickMovementMethod();
}
return sInstance;
}
@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;
} else {
Selection.removeSelection(buffer);
}
}
return false;
}
@Override
public void initialize(TextView widget, Spannable text) {
Selection.removeSelection(text);
}
}
content_text.setMovementMethod(CustomClickMovementMethod.getInstance());
content_text.setFocusable(false);
content_text.setClickable(false);
content_text.setLongClickable(false);
事件接受的顺序是从最外层布局到最内层布局，而事件的响应顺序是从最内层到最外层，事件先从最外层的viewgroup一层一层往最内层，分发如果最内层view不消费再一层一层的返还事件，这是一个haoshi
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