CODEWITHSUNDEEP
androidandroid-layoutandroid-custom-viewandroid-drawableandroid-resources
Michal
Michal

Reputation: 3642

Get custom drawable parameters from xml

I have my custom Drawable like this:

public class SeekBarBackgroundDrawable extends Drawable {
    Paint mBasePaint = null;

    public SeekBarBackgroundDrawable() {
        super();

        mBasePaint = new Paint();
        mBasePaint.setAntiAlias(true);
        mBasePaint.setStyle(Paint.Style.STROKE);
        mBasePaint.setStrokeCap(Paint.Cap.ROUND);
        mBasePaint.setStrokeWidth(10);
        mBasePaint.setColor(0xFF00FF00);

    }

    @Override
    public void draw(Canvas canvas) {    
        Rect r = getBounds();
        canvas.drawLine(r.left, canvas.getHeight()/2,r.right,canvas.getHeight()/2, mBasePaint);
    }

Now, this drawable is used in layer-list with parameters color and width like here:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@android:id/background">
        <cdev.mypreferences.SeekBarBackgroundDrawable
        android:width="1dp" android:color="@color/bg_color">

        </cdev.mypreferences.SeekBarBackgroundDrawable>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape android:shape="rectangle">
                <corners android:radius="20dp"></corners>
                <solid android:color="@color/seekbar_progress"></solid>
            </shape>
        </clip>
    </item>

</layer-list>

How can I get parameters from this xml into Drawable class? I need to set mBasePaint stroke width and color?

Upvotes: 0

Views: 827

Answers (1)

azizbekian
azizbekian

Reputation: 62189

Declaring custom drawables in xml is possible to do from API 24 onward, though I couldn't succeed to do that using the first approach mentioned in the docs.

Nevertheless, as the question relates to other aspect, I'll try to answer that part.

Adding this in your custom Drawable class would return the values you are interested in:


  private final int[] attrsArray = new int[] {
      android.R.attr.width,
      android.R.attr.color,
  };

  @Override public void inflate(@NonNull Resources r, @NonNull XmlPullParser parser,
      @NonNull AttributeSet attrs) throws XmlPullParserException, IOException {
    super.inflate(r, parser, attrs);

    final TypedArray a = r.obtainAttributes(attrs, attrsArray);
    float width = a.getDimensionPixelSize(0, 0);
    @SuppressLint("ResourceType")
    int color = a.getColor(1, 0);

    a.recycle();
  }

Upvotes: 1

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