我有一个helper.class，它具有四个不同的文本样式功能。我想通过按钮从另一个片段活动中调用它，这可以帮助我更改诸如粗体斜体等文本样式。
这是片段活动按钮的表单，我想在该表单中调用助手调用。
bold_btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
boldSelectedText();
}
});
这里是Helper.class，其中包含粗体和斜体功能
public class StyleSpanHelper
{
protected EditText mEditText;
protected Spannable mSpannable;
protected int mSelectedTextStart;
protected int mSelectedTextEnd;
public StyleSpanHelper(EditText editText)
{
mEditText = editText;
mSpannable = mEditText.getText();
mSelectedTextStart = mEditText.getSelectionStart();
mSelectedTextEnd = mEditText.getSelectionEnd();
}
public Spannable boldSelectedText()
{
Log.d("Ramansoft", "Try to bold selected text..");
StyleSpan[] styleSpans = mEditText.getText().getSpans(mSelectedTextStart, mSelectedTextEnd, StyleSpan.class);
if(styleSpans.length > 0) {
int lastSpanEnd = 0;
for (StyleSpan styleSpan : styleSpans) {
/**
* Save old style
*/
int oldStyle = styleSpan.getStyle();
/**
* Get start and end of span
*/
int spanStart = mSpannable.getSpanStart(styleSpan);
int spanEnd = mSpannable.getSpanEnd(styleSpan);
/**
* Before bold this span, we check if any unspanned
* text between this span and last span remains. if any
* unspanned text exist, we should bold it
*/
if(spanStart > lastSpanEnd)
{
mSpannable.setSpan(new StyleSpan(Typeface.BOLD), lastSpanEnd, spanStart, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
/**
* Update last span end
*/
lastSpanEnd = spanEnd;
/**
* Remove the span
*/
mSpannable.removeSpan(styleSpan);
/**
* Because we just need change selected text,
* if span start is lower than selected text start or
* if span end is higher than selected text end start
* we should restore span for unselected part of span
*/
if (spanStart < mEditText.getSelectionStart()) {
mSpannable.setSpan(new StyleSpan(oldStyle), spanStart, mSelectedTextStart, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
if (spanEnd > mEditText.getSelectionEnd()) {
mSpannable.setSpan(new StyleSpan(oldStyle), mSelectedTextEnd, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
/**
* We want to add bold style to current style
* so we most detect current style and change
* the style depend on current style
*/
if (oldStyle == Typeface.ITALIC) {
mSpannable.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
else {
mSpannable.setSpan(new StyleSpan(Typeface.BOLD), spanStart, spanEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
/**
* Now we should check if any
* unspanned selected text remains
*/
if(mSelectedTextEnd != lastSpanEnd)
{
mSpannable.setSpan(new StyleSpan(Typeface.BOLD), lastSpanEnd, mSelectedTextEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}
else
{
mSpannable.setSpan(new StyleSpan(Typeface.BOLD), mSelectedTextStart, mSelectedTextEnd, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
return mSpannable;
}
public Spannable unBoldSelectedText()
{
Log.d("Ramansoft", "Try to unbold selected text..");
StyleSpan[] styleSpans = mEditText.getText().getSpans(
mSelectedTextStart,
mSelectedTextEnd,
StyleSpan.class
);
for(StyleSpan styleSpan:styleSpans)
{
/**
* Save old style
*/
int oldStyle = styleSpan.getStyle();
/**
* Get start and end of span
*/
int spanStart = mSpannable.getSpanStart(styleSpan);
int spanEnd = mSpannable.getSpanEnd(styleSpan);
/**
* Remove the span
*/
mSpannable.removeSpan(styleSpan);
/**
* Because we just need change selected text,
* if span start is lower than selected text start or
* if span end is higher than selected text end start
* we should restore span for unselected part of span
*/
if(spanStart < mEditText.getSelectionStart())
{
mSpannable.setSpan(
new StyleSpan(oldStyle),
spanStart,
mSelectedTextStart,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
if(spanEnd > mEditText.getSelectionEnd())
{
mSpannable.setSpan(
new StyleSpan(oldStyle),
mSelectedTextEnd,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
/**
* Because we just want to remove bold style,
* if the span has another style, we should restore it
*/
if(oldStyle == Typeface.BOLD_ITALIC)
{
mSpannable.setSpan(
new StyleSpan(Typeface.ITALIC),
spanStart,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
}
return mSpannable;
}
public Spannable toggleBoldSelectedText()
{
Log.d("Ramansoft", "Try to toggle bold selected text..");
boolean isAllSpansBold = true;
StyleSpan[] styleSpans = mEditText.getText().getSpans(
mSelectedTextStart,
mSelectedTextEnd,
StyleSpan.class
);
if(styleSpans.length == 0)
{
return boldSelectedText();
}
else
{
for(StyleSpan styleSpan:styleSpans)
{
Log.d("Ramansoft", "styleSpan.getStyle() = " + styleSpan.getStyle());
if (styleSpan.getStyle() != Typeface.BOLD && styleSpan.getStyle() != Typeface.BOLD_ITALIC) {
isAllSpansBold = false;
break;
}
}
Log.d("Ramansoft", "isAllSpansBold = " + isAllSpansBold);
if(isAllSpansBold)
return unBoldSelectedText();
else
return boldSelectedText();
}
}
public Spannable italicSelectedText()
{
Log.d("Ramansoft", "Try to italic selected text..");
StyleSpan[] styleSpans = mEditText.getText().getSpans(
mSelectedTextStart,
mSelectedTextEnd,
StyleSpan.class
);
if(styleSpans.length > 0)
{
int lastSpanEnd = 0;
for (StyleSpan styleSpan : styleSpans) {
/**
* Save old style
*/
int oldStyle = styleSpan.getStyle();
/**
* Get start and end of span
*/
int spanStart = mSpannable.getSpanStart(styleSpan);
int spanEnd = mSpannable.getSpanEnd(styleSpan);
/**
* Before italic this span, we check if any unspanned
* text between this span and last span remains. if any
* unspanned text exist, we should italic it
*/
if(spanStart > lastSpanEnd)
{
mSpannable.setSpan(
new StyleSpan(Typeface.ITALIC),
lastSpanEnd,
spanStart,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
/**
* Update last span end
*/
lastSpanEnd = spanEnd;
/**
* Remove the span
*/
mSpannable.removeSpan(styleSpan);
/**
* Because we just need change selected text,
* if span start is lower than selected text start or
* if span end is higher than selected text end start
* we should restore span for unselected part of span
*/
if (spanStart < mEditText.getSelectionStart()) {
mSpannable.setSpan(
new StyleSpan(oldStyle),
spanStart,
mSelectedTextStart,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
if (spanEnd > mEditText.getSelectionEnd()) {
mSpannable.setSpan(
new StyleSpan(oldStyle),
mSelectedTextEnd,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
/**
* We want to add bold style to current style
* so we most detect current style and change
* the style depend on current style
*/
if (oldStyle == Typeface.BOLD) {
mSpannable.setSpan(
new StyleSpan(Typeface.BOLD_ITALIC),
spanStart,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
} else {
mSpannable.setSpan(
new StyleSpan(Typeface.ITALIC),
spanStart,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
}
/**
* Now we should check if any
* unspanned selected text remains
*/
if(mSelectedTextEnd != lastSpanEnd)
{
mSpannable.setSpan(
new StyleSpan(Typeface.ITALIC),
lastSpanEnd,
mSelectedTextEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
}
else
{
mSpannable.setSpan(
new StyleSpan(Typeface.ITALIC),
mSelectedTextStart,
mSelectedTextEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
return mSpannable;
}
public Spannable unItalicSelectedText()
{
Log.d("Ramansoft", "Try to un-italic selected text..");
StyleSpan[] styleSpans = mEditText.getText().getSpans(
mSelectedTextStart,
mSelectedTextEnd,
StyleSpan.class
);
for(StyleSpan styleSpan:styleSpans)
{
/**
* Save old style
*/
int oldStyle = styleSpan.getStyle();
/**
* Get start and end of span
*/
int spanStart = mSpannable.getSpanStart(styleSpan);
int spanEnd = mSpannable.getSpanEnd(styleSpan);
/**
* Remove the span
*/
mSpannable.removeSpan(styleSpan);
/**
* Because we just need change selected text,
* if span start is lower than selected text start or
* if span end is higher than selected text end start
* we should restore span for unselected part of span
*/
if(spanStart < mEditText.getSelectionStart())
{
mSpannable.setSpan(
new StyleSpan(oldStyle),
spanStart,
mSelectedTextStart,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
if(spanEnd > mEditText.getSelectionEnd())
{
mSpannable.setSpan(
new StyleSpan(oldStyle),
mSelectedTextEnd,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
/**
* Because we just want to remove bold style,
* if the span has another style, we should restore it
*/
if(oldStyle == Typeface.BOLD_ITALIC)
{
mSpannable.setSpan(
new StyleSpan(Typeface.BOLD),
spanStart,
spanEnd,
Spannable.SPAN_EXCLUSIVE_EXCLUSIVE
);
}
}
return mSpannable;
}
public Spannable toggleItalicSelectedText()
{
Log.d("Ramansoft", "Try to toggle italic selected text..");
boolean isAllSpansItalic = true;
StyleSpan[] styleSpans = mEditText.getText().getSpans(
mSelectedTextStart,
mSelectedTextEnd,
StyleSpan.class
);
if(styleSpans.length == 0)
{
return italicSelectedText();
}
else
{
for(StyleSpan styleSpan:styleSpans)
{
Log.d("Ramansoft", "styleSpan.getStyle() = " + styleSpan.getStyle());
if (styleSpan.getStyle() != Typeface.ITALIC && styleSpan.getStyle() != Typeface.BOLD_ITALIC) {
isAllSpansItalic = false;
break;
}
}
Log.d("Ramansoft", "isAllSpansItalic = " + isAllSpansItalic);
if(isAllSpansItalic)
return unItalicSelectedText();
else
return italicSelectedText();
}
}
}