SpannableString on button not works for API21?

Question

I try to put an icon on the toggle button by using SpannableString. and working on API17 but not on API21.

As you can see, It's work on Button and TextView for API17 but work on TextView only on API21 (The 'Z' is not replace by icon).

private SpannableStringBuilder createSpanIcon(int rid, String name){
    Drawable d = getActivity().getResources().getDrawable(rid);
    d.setBounds(0,0,20,20);
    ImageSpan imageSpan = new ImageSpan(d, DynamicDrawableSpan.ALIGN_BASELINE);
    SpannableStringBuilder builder = new SpannableStringBuilder();

        builder.append("Z\n")
               .append(name)
               .setSpan(imageSpan, 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        /* This give same result    
        builder.append("Z", imageSpan, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
               .append("RED", new ForegroundColorSpan(Color.RED), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE)
               .append("\n" + name);
        */

        return builder;
}

and

    Button btn = (Button)v.findViewById(R.id.myButton);
    SpannableStringBuilder _test = createSpanIcon(R.drawable.tc_g, "Click Me!" );
    btn.setText( _test );

    TextView txt = (TextView)v.findViewById(R.id.myText);
    SpannableStringBuilder _test2 = createSpanIcon(R.drawable.tc_g, "I'm text" );
    txt.setText( _test2 );

Note: I dont want to use setCompoundDrawablesWithIntrinsicBounds, be cause I'm gonna put the icons on ToggleButton so setTextOn and setTextOff will swap icons for me.

Anyone have an Idea why? and any work around?

Answer 1

You can work around this issue by disabling allCaps mode, which is true by default for Material-styled buttons.

From code,

txt.setAllCaps(false);

From XML,

<Button
    ...
    android:textAllCaps="false" />