Android -- SpannableString

SpannableString

Android通过SpannableString类来对EditText和TextView的指定文本进行处理。

ForegroundColorSpan

文本颜色

private void setForegroundColorSpan() {
    SpannableString spanString = new SpannableString("文本颜色");
    ForegroundColorSpan span = new ForegroundColorSpan(Color.BLUE);
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

BackgroundColorSpan

文本背景色

private void setBackgroundColorSpan() {
    SpannableString spanString = new SpannableString("背景色");
    BackgroundColorSpan span = new BackgroundColorSpan(Color.YELLOW);
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

StyleSpan

字体样式：粗体、斜体等

private void setStyleSpan() {
    SpannableString spanString = new SpannableString("粗体斜体");
    StyleSpan span = new StyleSpan(Typeface.BOLD_ITALIC);
    spanString.setSpan(span, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

RelativeSizeSpan

相对大小

private void setRelativeFontSpan() {
    SpannableString spanString = new SpannableString("字体相对大小");
    spanString.setSpan(new RelativeSizeSpan(2.5f), 0, 6,Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

TypefaceSpan

文本字体

private void setTypefaceSpan() {
    SpannableString spanString = new SpannableString("文本字体");
    spanString.setSpan(new TypefaceSpan("monospace"), 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanText);
}

URLSpan

文本超链接

private void addUrlSpan() {
    SpannableString spanString = new SpannableString("超链接");
    URLSpan span = new URLSpan("http://www.baidu.com");
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

ImageSpan

图片

private void addImageSpan() {
    SpannableString spanString = new SpannableString(" ");
    Drawable d = getResources().getDrawable(R.drawable.ic_launcher);
    d.setBounds(0, 0, d.getIntrinsicWidth(), d.getIntrinsicHeight());
    ImageSpan span = new ImageSpan(d, ImageSpan.ALIGN_BASELINE);
    spanString.setSpan(span, 0, 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

ClickableSpan

文本有点击事件

private TextView textView;
textView = (TextView)this.findViewById(R.id.textView);
String text = "显示Activity";
SpannableString spannableString = new SpannableString(text);
spannableString.setSpan(new ClickableSpan() {
    @Override
    public void onClick(View widget) {
        Intent intent = new Intent(Main.this,OtherActivity.class);
        startActivity(intent);
    }
    // 表示点击整个text的长度都有效触发这个事件
}, 0, text.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);
textView.setMovementMethod(LinkMovementMethod.getInstance());

UnderlineSpan

下划线

private void addUnderLineSpan() {
    SpannableString spanString = new SpannableString("下划线");
    UnderlineSpan span = new UnderlineSpan();
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

StrikethroughSpan

删除线

private void addStrikeSpan() {
    SpannableString spanString = new SpannableString("删除线");
    StrikethroughSpan span = new StrikethroughSpan();
    spanString.setSpan(span, 0, 3, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

SuggestionSpan

占位符

MaskFilterSpan

修饰效果，如模糊(BlurMaskFilter)、浮雕(EmbossMaskFilter)

RasterizerSpan

光栅效果

AbsoluteSizeSpan

绝对大小（文本字体）

private void setAbsoluteFontSpan() {
        SpannableString spannableString = new SpannableString("40号字体");
        AbsoluteSizeSpan absoluteSizeSpan = new AbsoluteSizeSpan(40);
        spannableString.setSpan(absoluteSizeSpan, 0, 5, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        editText.append(spannableString);
}

DynamicDrawableSpan

设置图片(基于文本基线或底部对齐)

TextAppearanceSpan

文本外貌（包括字体、大小、样式和颜色）

private void setTextAppearanceSpan() {
    SpannableString spanString = new SpannableString("文本外貌");
    TextAppearanceSpan textAppearanceSpan = new TextAppearanceSpan(this, android.R.style.TextAppearance_Medium)；
    spanString.setSpan(textAppearanceSpan, 0, 4, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    tv.append(spanString);
}

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