Getting android specific attribute in custom component

Question

I have my own custom component in xml written like this

    <com.app.components.CustomComponent
        android:id="@+id/component"
        android:layout_width="96dp"
        android:layout_height="96dp"
        android:scaleType="fitCenter"/>

Attrs:

<declare-styleable name="CustomComponent">
    <attr name="android:scaleType"/>
</declare-styleable>

My custom component constructor looks like this

@Bind(R.id.imageView) ImageView imageView;
@Bind(R.id.progressBar) ProgressBar progressBar;

public CustomComponent(Context context, AttributeSet attrs) {
    super(context, attrs);

    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FunGuideImageView, 0, 0);

  // how to correctly get scale type defined in xml ?
    int scaleType = a.getValue(R.styleable.CustomComponent_android_scaleType,
            ImageView.ScaleType);


    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View view = inflater.inflate(R.layout.imageview, this, true);
    ButterKnife.bind(view);
    imageView.setScaleType( scaleType );

}

How can I get the scaleType defined in xml and set it to my imageView?

Indeed CustomComponent is extending View. How does this help ? — Datenshi
– Datenshi, Commented Mar 18, 2016 at 15:56
If you extended ImageView, you can simply do getScaleType(), otherwise, I don't think making your styleables the same names as the android: attributes is a good idea. — OneCricketeer
– OneCricketeer, Commented Mar 18, 2016 at 16:01
If I am extending ImageView I cannot inflate my custom xml anymore. So at the moment I am extending LinearLayout — Datenshi
– Datenshi, Commented Mar 18, 2016 at 16:03
Why not? As far as I can tell you are making a custom ImageView that includes a ProgessBar. — OneCricketeer
– OneCricketeer, Commented Mar 18, 2016 at 16:05

Fernando Jascovich · Accepted Answer · 2016-03-22 18:01:17Z

4

Given the first two files, You have to make the following changes in order to get it work:

TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CustomComponent, 0, 0);
int scaleTypeIndex = a.getValue(R.styleable.CustomComponent_android_scaleType, -1);

Then you can get the ImageView.ScaleType array doing the following:

if(scaleTypeIndex > -1) {
    ImageView.ScaleType[] types = ImageView.ScaleType.values();
    ImageView.ScaleType scaleType = types[scaleTypeIndex];
    imageView.setScaleType(scaleType);
}

Remember to trash the TypedArray after use.

answered Mar 22, 2016 at 18:01

Fernando Jascovich

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1 Comment

jobernas Over a year ago

I had to use val scaleType: Int = a.getInt(R.styleable. CustomComponent_android_scaleType, -1) ... a.getValue returns a Boolean ... but it works with a.getInt

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