Android SpannableString的简单用法（一）

public class StringActivity extends AppCompatActivity {
private TextView mTextView;

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

mTextView = (TextView) findViewById(R.id.tv_string);
mTextView.setText(getStyle());
}

private CharSequence getStyle() {
String string = "设置字体类型，设置字体样式，设置字体大小，设置相对字体大小，设置字体颜色，设置字体背景颜色，设置下划线，设置删除线，设置上标，设置下标，设置图片-";
SpannableString span = new SpannableString(string);

//设置字体类型（Examples include "monospace", "serif", and "sans-serif"）
span.setSpan(new TypefaceSpan("serif"), 0, 6, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置字体样式（Examples include "NORMAL", "BOLD", "ITALIC", "BOLD_ITALIC"）
span.setSpan(new StyleSpan(Typeface.NORMAL), 7, 8, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
span.setSpan(new StyleSpan(Typeface.BOLD_ITALIC), 9, 13, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置字体大小（第二个参数如果为true，表示前面的字体大小单位为dip，否则为px）
span.setSpan(new AbsoluteSizeSpan(20), 14, 16, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
span.setSpan(new AbsoluteSizeSpan(20, true), 16, 20, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置相对字体大小，相对于默认字体的大小（0.5f表示默认字体的一半，2.0f表示默认字体的两倍)
span.setSpan(new RelativeSizeSpan(0.5f), 21, 23, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
span.setSpan(new RelativeSizeSpan(2.0f), 23, 29, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置字体颜色
span.setSpan(new ForegroundColorSpan(Color.BLUE), 30, 32, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
span.setSpan(new ForegroundColorSpan(Color.RED), 32, 36, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置字体背景颜色
span.setSpan(new BackgroundColorSpan(Color.YELLOW), 37, 45, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置下划线
span.setSpan(new UnderlineSpan(), 46, 51, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置删除线
span.setSpan(new StrikethroughSpan(), 52, 57, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

//设置上下标
span.setSpan(new SuperscriptSpan(), 61, 62, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);   //上标
span.setSpan(new SubscriptSpan(), 66, 67, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);     //下标

//设置图片
Drawable drawable = getResources().getDrawable(R.drawable.icon_android);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
span.setSpan(new ImageSpan(drawable), string.length() - 1, string.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

return span;
}

}