Change the color of multiple textView's in java

Question

I want to change the color of many textView at once programatically. Ideally instead of referencing each textView individually I would like to alter for example a color in colors.xml (with each textView having this color). Here is some code to help illustrate:

luminance = (0.2126f * RGBRed) + (0.7152f * RGBGreen) + (0.0722f * RGBBlue);

    if(luminance >= 160) {
        //change color of multiple textViews to black
    } else {
        //change color of multiple textViews to white
    }

Is there an easy way to do this or do I have to reference each textView?

Please include your code in your question – Aug 08 '15 at 10:22 — , Aug 08 '15 at 10:22

score 1 · Answer 1 · edited May 23 '17 at 12:14

1

You can use styles.

If you reference the style like this in your layouts:

<TextView
style="@style/MyTextViewStyle"
android:text="@string/hello" />

and add a styles.xml in the res/values/ folder with this content:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="MyTextViewStyle" parent="@android:style/TextAppearance.Medium">
        <item name="android:textColor">#0000FF</item>
    </style>
</resources>

you only need to update the color at one place: in the styles.xml file.

EDIT - ah, you mean changing it at runtime. Then I'd suggest to take a look at this answer.

edited May 23 '17 at 12:14

Community

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answered Aug 08 '15 at 10:24

Glorfindel

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Can I change the styles in java? I have a slider and when it goes below a certain point i want the multiple textViews to change colour from black to white. – mtmeyer Aug 08 '15 at 10:49
Sorry, that wasn't clear from your original question. You should still use styles and switch them dynamically as described [here](http://stackoverflow.com/a/6390025/4751173). – Glorfindel Aug 08 '15 at 10:56

score -1 · Answer 2 · answered Aug 08 '15 at 10:48

I suggest you to use SpannableString

you can set custom color to each part of your textview here is an example:

TextView myTV = (TextView)findViewById(R.id.textView1); String textString = "this is a test text for you"; Spannable spanText = Spannable.Factory.getInstance().newSpannable(textString); spanText.setSpan(new BackgroundColorSpan(0xFFFFFF00), 4, 12, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); myTV.setText(spanText);

Change the color of multiple textView's in java

2 Answers2