android TextView: setting the background color dynamically doesn't work

https://stackoverflow.com/questions/1466788

13-09-2019
|

Question

Setting the background color programatically of an android TextView doesn't seem to work. I'm I missing something!

TextView et = new TextView(activity);
et.setText("350");
et.setBackgroundColor(R.color.white);

I also have this file (colors.xml) in my res/values folder

<resources>
        <color name="white">#ffffffff</color>
        <color name="black">#ff000000</color>
</resources>

[EDIT]: Also, setting the text color causes the TextView to disappear.

TextView c1 = new TextView(activity);
c1.setTextColor(R.color.solid_red);
c1.setText("My Text");

Solution

Use et.setBackgroundResource(R.color.white);

OTHER TIPS

Try this:

TextView c1 = new TextView(activity);
c1.setTextColor(getResources().getColor(R.color.solid_red));
c1.setText("My Text");

I agree that a color and a resource have the same type, but I also spend a few hours to find this solution.

To set red color:

textView.setBackgroundColor(0xfff00000);

<color name="solid_red">#fff00000</color>

textView.setBackgroundResource(R.color.solid_red);

I had a similar issue where I was creating a numeric color without considering the leading alpha channel. ie. mytext.setTextColor(0xFF0000) (thinking this would be red ). While this is a red color it is also 100% transparent as it = 0x00FF0000; The correct 100% opaque value is 0xFFFF0000 or mytext.setTextcolor(0xFFFF0000).

Just this 1 line of code changed the background programmatically

tv.setBackgroundColor(Color.parseColor("#808080"));

Well I had situation when web service returned a color in hex format like "#CC2233" and I wanted to put this color on textView by using setBackGroundColor(), so I used android Color class to get int value of hex string and passed it to mentioned function. Everything worked. This is example:

String myHexColor = "#CC2233";
TextView myView = (TextView) findViewById(R.id.myTextView);
myView.setBackGroundColor(Color.pasrsehexString(myHexColor));

P.S. posted this answer because other solutions didn't work for me. I hope this will help someone:)

Here are the steps to do it correctly:

First of all, declare an instance of TextView in your MainActivity.java as follows:
```
TextView mTextView;
```
Set some text DYNAMICALLY(if you want) as follows:
```
mTextView.setText("some_text");
```
Now, to set the background color, you need to define your own color in the res->values->colors.xml file as follows:
```
<resources>
    <color name="my_color">#000000</color>
</resources>
```
You can now use "my_color" color in your java file to set the background dynamically as follows:
```
mTextView.setBackgroundResource(R.color.my_color);
```

tv.setTextColor(getResources().getColor(R.color.solid_red));

here is in little detail,

if you are in activity use this

textview.setBackground(ContextCompat.getColor(this,R.color.yourcolor));

if you are in fragment use below code

textview.setBackground(ContextCompat.getColor(getActivity(),R.color.yourcolor));

if you are in recyclerview adapter use below code

textview.setBackground(ContextCompat.getColor(context,R.color.yourcolor));

// use holder.textview if you are in onBindviewholder
//here context is passed from fragment

Color.parseHexColor("17ee27") did not work for me, instead Color.parseColor("17ee27") worked perfectly.

two ways to do that:

1.create color in colors.xml file like:

<resources>
        <color name="white">#ffffff</color>
</resources>

and use it int activity java class as:

et.setBackgroundResource(R.color.white);

et.setBackgroundColor(getResources().getColor(R.color.white));
                or
et.setBackgroundColor(Color.parseColor("#ffffff"));

If you would like to support all versions, do this:

myTextView.setBackgroundColor(ContextCompat.getColor(this,R.color.mycolor));

Jut use

ArrayAdapter<String> adaptername = new ArrayAdapter<String>(this,
            android.R.layout.simple_dropdown_item_1line, your array list);

you can use android:textColor= " whatever text color u want to give" in xml file where your text view is declared.

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