CODEWITHSUNDEEP
androidandroid-layoutandroid-canvasandroid-imageview
Evan Bashir
Evan Bashir

Reputation: 5551

How to set scaleType and adjustViewBounds in Custom ImageView

I've created a custom ImageView class, as I wanted to override the onDraw method for my Canvas; however, the XML attributes scaleType="centerInside" and adjustViewBounds="true" are not being inherited by my custom ImageView class. If I switch to the default ImageView, everything works fine - but how can I have it work in my custom Image View?

In the class below, I'm simply retrieving a bitmap from my application class and drawing it to the canvas; however, when using my CustomImageView - the image is massive and not scaled properly. Any idea how to fix this? Thanks!

Custom ImageView XML:

<com.project.app.controls.CustomImageView
    android:id="@+id/myImage"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:adjustViewBounds="true"
    android:scaleType="centerInside"/>

Custom ImageView Class:

public class CustomImageView extends ImageView {
    ProjectApp wApp;
    Paint paint;

    public CustomImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
        wApp = ProjectApp.createInstance();
        paint = new Paint();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
        canvas.drawBitmap(wApp.photoTaken, 0, 0, null);
    }
}

Upvotes: 4

Views: 2674

Answers (2)

petey
petey

Reputation: 17140

I think you want to use fitXY instead so the image will be bound by the constraints of the CustomImageView's layout params (and its parent in this case).

android:scaleType="fitXY"

Upvotes: 1

Carnal
Carnal

Reputation: 22064

public CustomImageView(Context context, AttributeSet attrs) {
    super(context, attrs);
    wApp = ProjectApp.createInstance();
    paint = new Paint();
    setAdjustViewBounds(true);
    setScaleType(ImageView.ScaleType.CENTER_INSIDE);
}

Upvotes: 2

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