ClickableSpan奇怪的行为:点击空白时调用onClick() [英] ClickableSpan strange behavior:onClick() called when clicking empty space
问题描述
我有一个 TextView
和 ClickableSpan
,因为layout_height和layout_width都是wrap_content。
当 TextView
中的文本不太长时,它可以正常工作。
当文本足够长以至于需要2行时,它也可以正常工作,但有一些奇怪的行为。
那是当我点击第二行line的空白空间(未填充文本但是 ClickableSpan
onClick ()
回调被调用。
我不指望这是因为我只点击了空白空间,而没有点击空白文本。
虽然它并没有太大影响,但我想知道背后是什么。
我设置了 ClickableSpan
以下代码:
TextView tv =(TextView)findViewById(R.id.text);
tv.setText(TEXT TEXT TEXT TEXT);
SpannableStringBuilder ssb = new SpannableStringBuilder();
ssb.append(tv.getText());
ssb.setSpan(new TestClickableSpan(),ssb.length() - 5,ssb.length(),0);
tv.setText(ssb);
tv.setMovementMethod(LinkMovementMethod.getInstance());
tv.setOnTouchListener(new TextViewOnTouchListener()); b
$ b class TextViewOnTouchListener实现OnTouchListener {
$ b $ @覆盖
public boolean onTouch(View v,MotionEvent event){
Log.d(TextView,onTouch );
返回false;
}
}
TestClickableSpan:
class TestClickableSpan extends ClickableSpan {
$ b @Override
public void onClick(View arg0){
Log.d (ClickableSpan,确认OnClick:+ arg0.toString());
}
}
I设法通过扩展LinkMovementMethod来解决它,并检查触摸事件
offset是否等于或大于文本长度:
public class MovementMethod extends LinkMovementMethod {
$ b $ @Override
public boolean onTouchEvent(TextView小部件,Spannable缓冲区,MotionEvent事件){
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();
布局布局= widget.getLayout();
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line,x);
if(off> = widget.getText()。length()){
//返回true,所以点击不会在剩余的空白区域被触发
return真正;
}
}
返回super.onTouchEvent(widget,buffer,event);
}
}
I have a TextView
with ClickableSpan
in that both layout_height and layout_width is wrap_content.
When the text in TextView
in not too long, it work fine.
When the text is long enough such that it take 2 line, it also work fine but have some strange behavior.
That is when I clicked on the second line's empty space(not fill with text yet but part of TextView
) , the ClickableSpan
onClick()
callback is called.
I do not expect this as I clicked the empty space only but not the spanned text. Although it does not affect much, I want to know what is behind.
I set the ClickableSpan
with below code:
TextView tv = (TextView) findViewById(R.id.text);
tv.setText("TEXT TEXT TEXT TEXT");
SpannableStringBuilder ssb = new SpannableStringBuilder();
ssb.append(tv.getText());
ssb.setSpan(new TestClickableSpan(), ssb.length()-5, ssb.length(), 0);
tv.setText(ssb);
tv.setMovementMethod(LinkMovementMethod.getInstance());
tv.setOnTouchListener(new TextViewOnTouchListener());
The TextViewOnTouchListener:
class TextViewOnTouchListener implements OnTouchListener{
@Override
public boolean onTouch(View v, MotionEvent event) {
Log.d("TextView", "onTouch");
return false;
}
}
The TestClickableSpan:
class TestClickableSpan extends ClickableSpan{
@Override
public void onClick(View arg0) {
Log.d("ClickableSpan", "Confirm OnClick: "+arg0.toString());
}
}
I managed to solve it by extending LinkMovementMethod, and check whether the touch event offset is equals or bigger than the text lenght:
public class MovementMethod extends LinkMovementMethod {
@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);
if (off >= widget.getText().length()) {
// Return true so click won't be triggered in the leftover empty space
return true;
}
}
return super.onTouchEvent(widget, buffer, event);
}
}
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