I might be misunderstanding some restrictions or subtlety about the
use of Spannables in a TextView.
It seems that whenever I apply an identical combination of display
enhancements to two separate and non-overlapping ranges of text, the
first set (earlier in the string) does not take effect in the actual
display.
For example, if I make characters 0-3 foreground blue, and also
characters 12-14 foreground blue, then only characters 12-14 appear
blue. But if I use a different combination of enhancements for the
second range, say, blue foreground with white background, the all of
the enhancements appear in both ranges as expected.
I hope the problem is in my own code, but I'm not seeing it, and I'm
suspecting that there is some consolidation at a lower level occurring
that is going awry. Here is a class I use to apply this stuff:
class EnhTextBuilder {
public static final String TAG = "ETB";
StringBuilder sbb;
Vector<Enote> enhVec; // hold enhancements
EnhTextBuilder () {
sbb = new StringBuilder();
enhVec = new Vector<Enote>(); // hold enhancements
}
private class Enote {
int pos, len;
Object enh;
Enote (int p, int l, Object e) {
pos = p; len = l; enh = e;
}
}
void append (String s) {
Log.d(TAG,"ETB text:"+s);
sbb.append(s);
}
void append (String s, Object e) {
Log.d(TAG,"ETB E:"+e);
enhVec.add(new Enote(sbb.length(),s.length(),e));
append(s);
}
void append (String s, Object[] e) {
for (int i = 0; i < e.length; i++) {
Log.d(TAG,"ETB E:"+e[i]);
enhVec.add(new Enote(sbb.length(),s.length(),e[i]));
}
append(s);
}
public String toString () { return sbb.toString(); }
// Put text into TextView and apply accumulated span
enhancements...
public void setText (TextView tv) {
tv.setText(sbb.toString());
Spannable sText = (Spannable)tv.getText();
//Log.d(TAG,"Spannable len:"+sText.length());
for (Iterator ei = enhVec.iterator(); ei.hasNext(); ) {
Enote e = (Enote)ei.next();
//Log.d(TAG,"Enh P: "+e.pos+" for "+e.len);
sText.setSpan(e.enh,e.pos,e.pos+e.len,0);
}
}
}
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