不同的屏幕尺寸

Question

I have looked through all of the android docs and many stack overflow questions, and I have a question on supporting multiple screen sizes. If I have some drawables, I know I need to put them in folders like these:

But does android make these folders for me? When I try copy and pasting my images into the drawable folder, I get something like this:

With no directory names. So do I have to manually make those directories, and then will android automatically pick the right image to use depending on the screen size?

I have the same question for the layout. For example, I know that to support many screen sizes, I need to put the layout in many folders like this:

But right now, my layout is like this:

So must I manually create each layout folder, and then copy and paste my current layout into the new layout folder, and then go into each layout, and render it until it looks nice on the android design tab of the XML? Then, will android pick out the best layout depending on the screen size for me?

I also get this when trying to make a new layout. What to fill in?

Thanks so much,

I have been delaying making my app compatible in different layouts because of these questions, I hope they can get answered!

Answer 1

You can create different layout folders and create layouts for standard screen sizes. There is a set of six generalized densities:

ldpi (low) ~120dpi
mdpi (medium) ~160dpi
hdpi (high) ~240dpi
xhdpi (extra-high) ~320dpi
xxhdpi (extra-extra-high) ~480dpi
xxxhdpi (extra-extra-extra-high) ~640dpi

You can create images and layouts for these and use accordingly.Mention that in you manifest also:

<compatible-screens>
    <screen
        android:screenDensity="ldpi"
        android:screenSize="small" />
    <screen
        android:screenDensity="mdpi"
        android:screenSize="normal" />
    <screen
        android:screenDensity="xhdpi"
        android:screenSize="large" />
    <screen
        android:screenDensity="xhdpi"
        android:screenSize="xlarge" />        
</compatible-screens>

Refer Supporting Multiple Screens for more details

There are some tips :

1. Don't hard code any layout parameters such as width,height,etc..
2. Don't use "px".Use "sp" for font sizes and "dp" for layout-width, layout-height etc.
3. Make use of RelativeLayout and LinearLayout and don't use AbsoluteLayout as it is deprecated.
4. Use ScrollView wherever required for layouts as it supports for a single view.

Answer 2

yes you have to make different layout folders for different screen sizes like layout-sw480dp , layout-sw600dp like that for different screen sizes and for landscape view use layout-landscape . and you have to use drawable-hdpi , drawable-mdpi , drawable-ldpi , drawable-xhdpi etc to put different resoultion images for different screeen resolution devices