Spannable string is not working in my textview-CodePudding

I want to set a spannable string in my text view when a button is clicked, where the first word has white foreground color and striked out and the second word has red foreground color. This is my code:

My textview:

<TextView
   android:id="@ id/charge_per_month"
   android:layout_width="match_parent"
   android:layout_height="wrap_content"
   android:layout_marginStart="16pt">
</TextView>

My java code:

TextView charge_month = findViewById(R.id.charge_per_month);

String exp_amount = "₹ 5600"; //should be white in color and striked out

String act_amount = "₹ 6708"; //should be red in color

String complete_string = exp_amount   "  " act_amount;

submit.setOnClickListener(new View.OnClickListener() {

    @Override

    public void onClick(View view) {

        Spannable str = new SpannableString (complete_string);

        str.setSpan(new StrikethroughSpan(), 0, exp_amount.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        str.setSpan(new ForegroundColorSpan(Color.WHITE),0, exp_amount.length(), Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        str.setSpan(new ForegroundColorSpan(Color.RED),exp_amount.indexOf(exp_amount.charAt(0)),act_amount.length(),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        charge_month.setText(str);
     
        }
}

The spannable string just shows for a split second, when the button is clicked. How do I fix this?

CodePudding user response：

Try This

TextView charge_month = findViewById(R.id.charge_per_month);
        String exp_amount = "₹ 5600";
        String act_amount = "₹ 6708";
        String complete_string = exp_amount   "  "   act_amount;
        Spannable str = new SpannableString(complete_string);
        str.setSpan(new StrikethroughSpan(), 0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        str.setSpan(new ForegroundColorSpan(Color.WHITE),0, 1, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        str.setSpan(new ForegroundColorSpan(Color.RED),2, act_amount.length(),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        charge_month.setText(str);

CodePudding user response：

change this from:

str.setSpan(new ForegroundColorSpan(Color.RED),exp_amount.indexOf(exp_amount.charAt(0)),act_amount.length(),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

str.setSpan(new ForegroundColorSpan(Color.RED),exp_amount.length()   1,complete_string.length(),Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);