CODEWITHSUNDEEP
androidandroid-bitmapandroid-selectorxml-drawable
Ashish Tiwari
Ashish Tiwari

Reputation: 2246

Setting alpha to bitmap in XML drawable not working on API Level 20 and below

I am setting alpha to a bitmap in XML (selector) and its working fine on API level 23 , 22 , 21 but its doesn't work on API level 20 and below API levels.

<selector xmlns:android="http://schemas.android.com/apk/res/android">

<!--State Selected-->
<item android:drawable="@drawable/item_selected" android:state_selected="true"/>
<!--State Normal-->
 <item >
    <bitmap android:src="@drawable/item_selected" android:alpha="0.6"/>
</item>

Edit

Please suggest me some alternatives to do this by using XML.

Upvotes: 0

Views: 1469

Answers (2)

HappyOrca
HappyOrca

Reputation: 89

bitmap element's alpha attribute was added at API 21 so there is no way setting alpha in the xml. you could set alpha using the code according to Janki Gadhiya's answer.

Upvotes: 1

Janki Gadhiya
Janki Gadhiya

Reputation: 4510

Setting alpha programmatically will work. Try this.

I have tried your selector as the background of this ImageView:

<ImageView
    android:id="@+id/imageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/select"
    />

My java code :

imageView = (ImageView)findViewById(R.id.imageView);
    imageView.setAlpha(0.5f);
    imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            Toast.makeText(MainActivity.this, ""+imageView.isSelected()
                    , Toast.LENGTH_SHORT).show();
            if(imageView.isSelected())
            {
                imageView.setSelected(false);
                // set alpha 0.5
                imageView.setAlpha(0.5f);
            }
            else {
                imageView.setSelected(true);
                // set alpha 1
                imageView.setAlpha(1f);
            }
        }
    });

Upvotes: 2

Related Questions