仅以编程方式更改textview中某些文本的背景颜色

Question

How can I change the background of some text within my view programmatically only using as few lines of code as possible? I tried to use the background tag within the html but unfortunately it doesn't support that hence is there any possible workaround to achieve something like the image below?

XML

<TextView
    android:id="@+id/main_textView0"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    style="@android:style/TextAppearance.Medium"/>

Java

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    View v = getView();

    TextView txt = (TextView)v.findViewById(R.id.main_textView0);
    txt.setText(Html.fromHtml("<font color='#0099CC'>" + getResources().getString(R.string.hello) + "</font>" +
                    " " +
                    "<font color='#000000'>" + getResources().getString(R.string.world) + "</font>"
    ));

    super.onActivityCreated(savedInstanceState);
}

Answer 1

Try Spannable , something like:

            String str1 = "Hello";
            String str2 = "world";
            String message = str1 + " " + str2;

            Spannable spannable = new SpannableString(message);
            spannable.setSpan(new ForegroundColorSpan(Color.BLUE),0, str1.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);

            textView.setText(spannable);

Answer 2

Your code is called from the UI thread (as it should be) but the call to Html.fromHtml(...) is very very expensive. You can do it better by wrapping a couple of TextViews together in a LinearLayout and set each of separately. It might not look nicer in first look but it much easier to maintain and saves cpu. Especiallyif you intend to use this is a recyclerview or something.