Android：SpannableString使用详解

效果

代码如下

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nxiangbo.spansdemo.MainActivity" >

<TextView
android:id="@+id/tv_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="5dp"
android:text="@string/content"/>

</RelativeLayout>

public class MainActivity extends Activity {
private static final String TAG = "MainActivity";

private TextView mText;
private SpannableString mSpannableString;

private String mContent;

private static final String itallic = "三月七日沙湖道中遇雨。雨具先去，同行皆狼狈，余独不觉。已而遂晴，故作此 ";
private static final String bold = "谁怕？ 一蓑烟雨任平生";
private static final String underline = "莫听穿林打叶声";
private static final String subscript = "徐行";
private static final String superscript = "轻胜马";
private static final String backgroundCorlor = "料峭春风吹酒醒";
private static final String foregroundColor = "微冷";
private static final String relativeSize = "山头";
private static final String maskFilter = "却相迎";
private static final String scaleX = "回首";
private static final String strikeThrough = "萧瑟处";
private static final String blurMaskFilter = "归去";
private static final String image = "苏轼";
private static final String quote = "人间不可无一，难能有二";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

mText = (TextView) findViewById(R.id.tv_content);
mContent = getResources().getString(R.string.content);
mSpannableString = new SpannableString(mContent);

Log.e(TAG, mContent.length()+"mContent.length");

setItallic(itallic);
setBold(bold);
setUnderLine(underline);
setSubscript(subscript);
setSuperscript(superscript);
setBackgroundColor(backgroundCorlor);
setForegroundColor(foregroundColor);
setRelativeSize(relativeSize);
setMaskFilter(maskFilter);
setScaleX(scaleX);
setStrikeThrough(strikeThrough);
setBlurMaskFilter(blurMaskFilter);
setImage(image);
setQuote(quote);
mText.setText(mSpannableString);

}

//将"苏轼"替换成一张图片
@SuppressLint("NewApi")
private void setImage(String text) {
Object span = null;
span = new ImageSpan(this,R.drawable.demo);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//将字体
4000
设置为模糊效果
private void setBlurMaskFilter(String text) {
Object span = null;
span = new MaskFilterSpan(new BlurMaskFilter(5, BlurMaskFilter.Blur.OUTER));
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置删除线
private void setStrikeThrough(String text) {
Object span = null;
span = new StrikethroughSpan();
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置字体在水平方向上放大两倍
private void setScaleX(String text) {
Object span = null;
span = new ScaleXSpan(2.0f);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置字体为浮雕形式的
private void setMaskFilter(String text) {
Object span = null;
span = new MaskFilterSpan(new EmbossMaskFilter(new float[] { 1, 5, 1 }, 0.4f, 6, 3.5f));
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;

ForegroundColorSpan fg = new ForegroundColorSpan(Color.RED);
StyleSpan style = new StyleSpan(android.graphics.Typeface.BOLD);
mSpannableString.setSpan(fg, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
mSpannableString.setSpan(style, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置字体大小的原来大两倍
private void setRelativeSize(String text) {
Object span = null;
span = new RelativeSizeSpan(2.0f);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置前景颜色
private void setForegroundColor(String text) {
Object span = null;
span = new ForegroundColorSpan(Color.BLUE);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置背景颜色
private void setBackgroundColor(String text) {
Object span = null;
span = new BackgroundColorSpan(Color.YELLOW);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置黑体
private void setBold(String text){
Object span = null;
span = new StyleSpan(android.graphics.Typeface.BOLD);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置斜体
private void setItallic(String text){
Object span = null;
span = new StyleSpan(android.graphics.Typeface.ITALIC);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;

mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置引用
private void setQuote(String text){
Object span = null;
span = new CustomQuoteSpan(Color.BLUE);
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置下划线
private void setUnderLine(String text){
Object span = new UnderlineSpan();
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置下标
private void setSubscript(String text){
Object span = new SubscriptSpan();
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

//设置上标
private void setSuperscript(String text){
Object span = new SuperscriptSpan();
WordPosition position = getWordPosition(text);
int textStart = position.start;
int textEnd = position.end;
mSpannableString.setSpan(span, textStart, textEnd, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
}

private WordPosition getWordPosition(String text) {
int start = mContent.indexOf(text);
int end = start + text.length();
return new WordPosition(start, end);
}

private static final class WordPosition {
int start;
int end;

private WordPosition(int start, int end) {
this.start = start;
this.end = end;
}

@Override
public String toString() {
return "WordPosition{" +
"start=" + start +
", end=" + end +
'}';
}
}

}

源码下载地址

参考文章