引言:
之前,能用一个TextView解决的事情为什么要用两个呢。
方法:
1.两个TextView,甚至多个,可以实现…
2.正解来了,使用SpannableString或SpannableStringBuilder,这两个类专门用于字体样式设置,可以更改颜色,设置点击事件等。
用法:
SpannableString spannableString=new SpannableString("This is a partly click text");
spannableString.setSpan(new ClickableSpan() {
@Override
public void onClick(@NonNull View widget) {
Toast.makeText(Main2Activity.this, "Yes!!!", Toast.LENGTH_SHORT).show();
}
/**
* 重写此函数是为了去除默认的下划线,以及设置我们自己的颜色
* @param ds 用于自定义样式的画笔对象
*/
@Override
public void updateDrawState(@NonNull TextPaint ds) {
super.updateDrawState(ds);
ds.setColor(Color.YELLOW);
ds.setUnderlineText(false);
}
},17,spannableString.length(), Spanned.SPAN_INCLUSIVE_INCLUSIVE);
mPartClick.setText(spannableString);
mPartClick.setMovementMethod(LinkMovementMethod.getInstance());
//注意,设置了ClickableSpan后,点击将会触发TextView在该区域的高亮效果,即一个背景变化,我们手动去除
mPartClick.setHighlightColor(getResources().getColor(android.R.color.transparent));
解释:
1.核心setSpan函数接收四个参数,一个Object(这个参数很厉害,可以传入各种像 xxxSpan名称类的对象,用于设置点击事件或字体颜色等),一个start参数(从哪个文字开始),一个end参数(从哪个文字结束),一个flag参数。
这里说一下flag参数,一般设置为:
/**
* Non-0-length spans of type SPAN_INCLUSIVE_EXCLUSIVE expand
* to include text inserted at their starting point but not at their
* ending point. When 0-length, they behave like marks.
*/
public static final int SPAN_INCLUSIVE_EXCLUSIVE = SPAN_MARK_MARK;
/**
* Spans of type SPAN_INCLUSIVE_INCLUSIVE expand
* to include text inserted at either their starting or ending point.
*/
public static final int SPAN_INCLUSIVE_INCLUSIVE = SPAN_MARK_POINT;
/**
* Spans of type SPAN_EXCLUSIVE_EXCLUSIVE do not expand
* to include text inserted at either their starting or ending point.
* They can never have a length of 0 and are automatically removed
* from the buffer if all the text they cover is removed.
*/
public static final int SPAN_EXCLUSIVE_EXCLUSIVE = SPAN_POINT_MARK;
/**
* Non-0-length spans of type SPAN_EXCLUSIVE_INCLUSIVE expand
* to include text inserted at their ending point but not at their
* starting point. When 0-length, they behave like points.
*/
public static final int SPAN_EXCLUSIVE_INCLUSIVE = SPAN_POINT_POINT;
这四个常量,分别代表了
Spanned.SPAN_EXCLUSIVE_EXCLUSIVE - 不包含两端start和end所在的端点
Spanned.SPAN_EXCLUSIVE_INCLUSIVE - 不包含端start,但包含end所在的端点
Spanned.SPAN_INCLUSIVE_EXCLUSIVE - 包含两端start,但不包含end所在的端点
Spanned.SPAN_INCLUSIVE_INCLUSIVE - 包含两端start和end所在的端点
实际上我操作起来,发现并没有什么区别好像。。。
2.若为TextView设置了点击事件,我们部分点击将会失效。
3.设置了部分点击,还需setMovementMethod之后,才能生效,即响应点击事件,原因暂不明确。