Android and Setting Width and Height Programmatically in Dp Units

Android and setting width and height programmatically in dp units

You'll have to convert it from dps to pixels using the display scale factor.

final float scale = getContext().getResources().getDisplayMetrics().density;
int pixels = (int) (dps * scale + 0.5f);

Set ImageView Size Programmatically in DP Java

You need to convert your value to dps, you can use the following function to do so:

public static int dpToPx(int dp, Context context) {
    float density = context.getResources().getDisplayMetrics().density;
    return Math.round((float) dp * density);
}

Then, to set the ImageView size to the px value, you can do this:

LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)imageView.getLayoutParams();
params.width = dpToPx(45);
params.height = dpToPx(45);
imageView.setLayoutParams(params);

(Change LinearLayout for whatever container your ImageView is in)

Edit: Kotlin Version

The function to convert to Px can be written like this in kotlin (as an extension)

fun Int.toPx(context: Context) = this * context.resources.displayMetrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT

Then can use it like this:

view.updateLayoutParams {
    width = 200.toPx(context)
    height = 100.toPx(context)
}

How to set Layoutparams height/width in dp value?

When you specify values programmatically in the LayoutParams, those values are expected to be pixels.

To convert between pixels and dp you have to multiply by the current density factor. That value is in the DisplayMetrics, that you can access from a Context:

float pixels =  dp * context.getResources().getDisplayMetrics().density;

So in your case you could do:

.
.
float factor = holder.itemView.getContext().getResources().getDisplayMetrics().density;
params.width = (int)(item.getWidth() * factor);
params.height = (int)(item.getHeight() * factor);
.
.

What unit should I use to set imageView width and height in Android?

They're in pixels. All lengths and widths outside of xml are in pixels. You can convert DP to pixels by using Converting pixels to dp if you want to specify the size in dp.

Programmatically set height on LayoutParams as density-independent pixels

You need to convert your dip value into pixels:

int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, <HEIGHT>, getResources().getDisplayMetrics());

For me this does the trick.

How can I set layout height and width programmatically which support all screen size in Android?

You can get the device density like this:

float scaledDensity = getResources().getDisplayMetrics().scaledDensity;
LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(20 * scaledDensity,20 * scaledDensity);
        param1.weight=1;

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