CODEWITHSUNDEEP
androidandroid-edittext
Simon
Simon

Reputation: 19938

Android: drawableLeft setting alpha

Is there anyway to set alpha on a drawable sitting within an editText as a drawableLeft?

            <EditText
                android:layout_width="match_parent"
                android:layout_height="40dp"
                android:background="@drawable/edittext_middle_bg"
                android:id="@+id/birthday_overlay"
                android:editable="false"
                android:focusable="false"
                android:padding="10dp"
                android:hint="Birthday"
                android:textColorHint="#bbbbbb"
                android:drawablePadding="10dp"
                android:drawableLeft="@drawable/ic_cake_black_24dp"/>

birthdayIcon

I got the icon from the material icon library by Google. The icon is where alpha is 1 (so full black). I want to make it slightly grey by making alpha 0.5 for example.

I guess I can use GIMP / Photoshop to change the alpha but would prefer to use android to do this programmatically.

Upvotes: 3

Views: 2991

Answers (4)

Javier Reinoso
Javier Reinoso

Reputation: 11

I search many and found this unique - for my research - solution:

I make with a CountDownTimer, work good.

Drawable[] compundDrawables = textview_with_drawableLef_Image.getCompoundDrawables();
Drawable leftCompoundDrawable = compundDrawables[0];

And after in a countdowntimer, I blink the leftCompoundDrawable setting the:

leftCompoundDrawable.setApha(AlphaNumber);

Work Good, Need a little adjust of countDownInterval and Alpha Value Step, check when alpha is minor to 0 or more to 255 (Alpha in Drawables is from 0 to 255) and change step alpha to + or --, but is easy to adjust for good look.

The CountDownTimer is very usseful in some cases.

Upvotes: 0

Ben
Ben

Reputation: 1061

Drawable drawable = getResources().getDrawable(R.drawable.yourdrawable);

// set opacity
drawable.setAlpha(10);

//Set it
button.setCompoundDrawablesWithIntrinsicBounds(drawable, 0, 0, 0);

Upvotes: 1

Simon
Simon

Reputation: 19938

So this is eventually what I did to achieve my desired outcome.

    Drawable[] birthdayDrawable = birthdayOverlay.getCompoundDrawables();
    birthdayDrawable[0].setAlpha(128); //set it at 128 so that it has 50% opacity. The opactiy here ranges from 0 to 255.

Upvotes: 4

Lucas Crawford
Lucas Crawford

Reputation: 3118

@SuppressLint("NewApi") 
public static void setAlpha(View view, float alpha){ 
    if (Build.VERSION.SDK_INT < 11) { 
        final AlphaAnimation animation = new AlphaAnimation(alpha, alpha);
        animation.setDuration(0);
        animation.setFillAfter(true); 
        view.startAnimation(animation); 
    } 
    else 
        view.setAlpha(alpha); 
}

Use this method. Pass the argument as your drawableLeft from the EditText. This works for <= API 16 and > API 16.

Upvotes: 1

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