Android: how to set the height/width of the src image of a ImageButton?

Question

Android: how to set the height/width of the image(src image intead of the background) of a ImageButton?

I want to set the height/width of the top level image(not the background) image, the size of image should be customized instead of fullfill the button automatically

Answer 1

You can just Use the scaleType attribute of ImageButton. Set it to fitXY or fitCenter or anything else according to your need.

like this

<ImageButton
    android:id="@+id/imageButton"
    android:layout_width="100dp"
    android:layout_height="100dp"
    android:scaleType="fitCenter"
    android:src="@drawable/some_image">
</ImageButton>

Answer 2

You can use Bitmap.createScaledBitmap to scale the image to the size you want.

Bitmap image = ... //load image from your source
image = Bitmap.createScaledBitmap(image, desiredHeight, desiredWidth, true);

Answer 3

xml

<ImageButton
android:id="@+id/picture_id"
android:layout_width="10dp"  //here width with unit. 5 dp exemple
android:layout_height="3dp"  //here height with unit. 3 dp exemple
android:src="@drawable/picture_name"
/>

EDIT: (java code)

// load the origial BitMap (500 x 500 px)
    Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
           R.drawable.android);

    int width = bitmapOrg.width();
    int height = bitmapOrg.height();
    int newWidth = 200;
    int newHeight = 200;

    // calculate the scale - in this case = 0.4f
    float scaleWidth = ((float) newWidth) / width;
    float scaleHeight = ((float) newHeight) / height;

    // create a matrix for the manipulation
    Matrix matrix = new Matrix();
    // resize the bit map
    matrix.postScale(scaleWidth, scaleHeight);
    // rotate the Bitmap
    matrix.postRotate(45);

    // recreate the new Bitmap
    Bitmap resizedBitmap = Bitmap.createBitmap(bitmapOrg, 0, 0,
                      width, height, matrix, true);

    // make a Drawable from Bitmap to allow to set the BitMap
    // to the ImageView, ImageButton or what ever
    BitmapDrawable bmd = new BitmapDrawable(resizedBitmap);

    ImageView imageView = new ImageView(this);

    // set the Drawable on the ImageView
    imageView.setImageDrawable(bmd);

    // center the Image
    imageView.setScaleType(ScaleType.CENTER);

    // add ImageView to the Layout
    linLayout.addView(imageView,
            new LinearLayout.LayoutParams(
                  LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT
            )
    );

Answer 4

I had same problem... change the size of 'src' image of image button(not the size of button just image only).

what i did--

I moved those '.png' file from 'drawable' folder to 'drawable-hdpi' folder.

weird... but it worked.

thanks,

Answer 5

set padding and scaletype to centerInside

Padding will help you customize the source image to provide the required height and width.

 <ImageButton
            android:layout_width="50dp"
            android:layout_height="50dp"
            android:src="@drawable/location"
            android:padding="10dp"
            android:scaleType="centerInside"
            android:background="@drawable/blue_circle_border"/>