how to center layout to vertical in android through java code?

friends,

i want to set android:layout_centerVertical="true" property of layout through java code of an image.

can any one guide me how to achieve this. here is my code.

RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);

params.height开发者_JAVA百科 = (int)totalHeight;

img.setLayoutParams(params);

i have tried using setScaleType(ScaleType.FIT_CENTER) but no use.

any help would be appriciated.

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Try this Code..

RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams
          ((int) LayoutParams.WRAP_CONTENT, (int) LayoutParams.WRAP_CONTENT);

params.addRule(RelativeLayout.CENTER_VERTICAL);

img.setLayoutParams(params);

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Correct me if I'm wrong but it sounds like you are trying to set the alignment (or positional orientation) of an image inside of a layout? To do that you need to set the gravity property of the layout containing the View you align.

    Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);

    RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout);
    RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
            RelativeLayout.LayoutParams.FILL_PARENT, 
            RelativeLayout.LayoutParams.WRAP_CONTENT);

    ImageView imageView = new ImageView(this);
    imageView.setLayoutParams(params);
    imageView.setImageBitmap(bitmap);

    layout.setGravity(Gravity.CENTER_VERTICAL | Gravity.TOP);
    layout.addView(imageView);

In this example I'm programmatically adding an image to a RelativeLayout in my layout resource, adding an ImageView, and aligning it so it will be placed at the top, vertical center position.

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In the new SDK there's no Gravity.VERTICAL_CENTER, but maybe you could set this with layout.setGravity(Gravity.CENTER).