TRYING TO SET OPACITY (ALPHA) FOR A VIEW IN ANDROID

Anurag Sharma

Total Post:40

Points:280
Posted by  Anurag Sharma
 530  View(s)
Ratings:
Rate this:
I am using a  button :
<Button 
     android:text="Submit" 
     android:id="@+id/Button01" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content">
</Button>
In my onCreate() event, I am calling Button01 like this:

setContentView(R.layout.main);
View Button01 = this.findViewById(R.id.Button01);
Button01.setOnClickListener(this);
There is a background in the application, and I want to set an opacity on this submit button. How can I set an opacity for this view? Is it something that I can set on the java side, or can I set in the main.xml file?

On the java side I tried Button01.mutate().SetAlpha(100), but it gave me an error
  1. Mayank Tripathi

    Post:397

    Points:3117
    Re: Trying to set opacity (alpha) for a view in android

    Hi Anurag,


    You just need to extend TextView and override onSetAlpha:

    import android.content.Context;
    import android.util.AttributeSet;
    import android.widget.TextView;
    public class AlphaTextView extends TextView {
      public AlphaTextView(Context context) {
        super(context);
      }
      public AlphaTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
      }
      public AlphaTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
      }
      @Override
      public boolean onSetAlpha(int alpha) {
        setTextColor(getTextColors().withAlpha(alpha));
        setHintTextColor(getHintTextColors().withAlpha(alpha));
        setLinkTextColor(getLinkTextColors().withAlpha(alpha));
        return true;
      }
    }

Answer

NEWSLETTER

Enter your email address here always to be updated. We promise not to spam!