{"id":14666,"date":"2014-07-11T13:09:08","date_gmt":"2014-07-11T07:39:08","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=14666"},"modified":"2014-07-11T13:09:08","modified_gmt":"2014-07-11T07:39:08","slug":"handle-multiple-screen-sizes-in-android","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/handle-multiple-screen-sizes-in-android\/","title":{"rendered":"Handle Multiple Screen Sizes in Android"},"content":{"rendered":"

Android devices come in a variety of screen sizes and resolutions. That’s why handling the multiple screen size in android is most important.<\/p>\n

TERMS AND CONCEPTS<\/strong><\/span><\/p>\n

Screen size :<\/strong> Actual physical size, measured as the screen’s diagonal.For simplicity, Android groups has four generalized sizes: small, normal, large, and extra large.<\/p>\n

<\/del>Screen density :<\/strong> The quantity of pixels within a physical area of the screen; usually referred to as dpi (dots per inch).For simplicity, Android groups has four generalized densities: low, medium, high, and extra high.<\/p>\n

Orientation :<\/strong>\u00a0 The orientation of the screen from the user’s point of view.In Android, This is either landscape or portrait.<\/p>\n

Resolution :<\/strong> The total number of physical pixels on a screen.In Android, we do not work directly with resolution; applications should be concerned only with screen size and density.<\/p>\n

How To Support Different Screen’s.<\/strong><\/span><\/p>\n

Basically we are mainly this things by three ways.
\n1.<\/strong> Explicitly declare in the manifest which screen sizes your application supports.
\n2.<\/strong> Provide different layouts for different screen sizes.
\n3.<\/strong> Provide different bitmap drawables for different screen densities.<\/p>\n

1. Explicitly declare in the manifest which screen sizes your application supportss<\/b><\/span><\/p>\n

To set up support for multiple device sizes in Android, add the <support-screens> <\/span>element into the AndroidManifest.xml file. This field specifies which screen size support and which do not.<\/p>\n

[xml]
\n<?xml version="1.0" encoding="utf-8"?>
\n<manifest ..><\/p>\n

<supports-screens
\nandroid:smallScreens="true"
\nandroid:normalScreens="true"
\nandroid:largeScreens= "true"
\nandroid:anyDensity="true"
\n\/><\/p>\n

<application… >
\n\u2026.
\n<\/application>
\n<\/manifest>
\n[\/xml]<\/p>\n

we can also define dp in the <support-screens> <\/span>element like-<\/p>\n

[xml]
\n<manifest >
\n <supports-screens android:requiresSmallestWidthDp="600" \/>
\n<\/manifest>
\n[\/xml]<\/p>\n

2. Provide different layouts for different screen sizes<\/b><\/span><\/p>\n

As we design our UI for different screen sizes, we’ll discover that each design requires a minimum amount of space. So, each generalized screen size above has an associated minimum resolution that’s defined by the system. These minimum sizes are in “dp” units.<\/p>\n

[java]
\nres\/layout\/my_layout.xml \/\/ layout for normal screen size ("default")
\nres\/layout-small\/my_layout.xml \/\/ layout for small screen size
\nres\/layout-large\/my_layout.xml \/\/ layout for large screen size
\nres\/layout-xlarge\/my_layout.xml \/\/ layout for extra large screen size
\nres\/layout-xlarge-land\/my_layout.xml \/\/ layout for extra large in landscape orientation
\n[\/java]<\/p>\n

We can also define it on the basis of dp like –<\/p>\n

[java]
\nres\/layout\/main_activity.xml \/\/ For handsets
\nres\/layout-sw600dp\/main_activity.xml \/\/ For 7\u201d tablets(600×1024 mdpi).600dp wide and bigger.
\nres\/layout-sw720dp\/main_activity.xml \/\/ For 10\u201d tablets (720×1280 mdpi).720dp wide and bigger.
\n[\/java]<\/p>\n

3. Provide different bitmap drawables for different screen densities<\/b><\/span><\/p>\n

To set labels for different layouts, dimensions or different screen density resources, use the following resource directories:<\/p>\n

\"Aug13_handling01\"<\/a><\/p>\n

For example:<\/span><\/p>\n

[java]
\nres\/drawable-hdpi\/myImg.png \t\/\/ bitmap used for high-density
\nres\/drawable-mdpi\/myImg.png \t\/\/ bitmap used for medium-density
\nres\/drawable-ldpi\/myImg.png\t \/\/ bitmap used for low-density
\nres\/drawable-xhdpi\/myImg.png \/\/ bitmap used for extra high density
\n[\/java]<\/p>\n

Handing Screen Density<\/b><\/span><\/span><\/p>\n

We can develop our application to maintains the physical size of the interface by using match_parent and wrap_content values for android:layout_width and android:layout_height. This parameter does not specify size but adapts to the space available.<\/span><\/p>\n

[xml]
\n…
\nandroid:layout_width = "match_parent"
\nandroid:layout_height = "wrap_content"
\n…
\n[\/xml]<\/p>\n

Bitmap scaling can result in blurry images. To prevent this, provide higher-resolution bitmaps for high-density screens and the system will use those instead of resizing the bitmap designed for medium-density screens.<\/span><\/p>\n

A<\/span><\/p>\n

Following are ways the Android system helps to achieve density independence:<\/span><\/p>\n

1.<\/strong> Android considers dp [density-independent pixels] units as appropriate for the current screen density. <\/span><\/span><\/p>\n

2.<\/strong> Android also accounts for scaled pixels (sp), which are scaled based on the user’s preference of font size (FONT_SCALE value in System. Settings).<\/span><\/p>\n

3.<\/strong> Android scales the drawable resources to the suitable size, if alternative resources are not available, and it solely depends on the current screen density.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Android devices come in a variety of screen sizes and resolutions. That’s why handling the multiple screen size in android is most important. TERMS AND CONCEPTS Screen size : Actual physical size, measured as the screen’s diagonal.For simplicity, Android groups has four generalized sizes: small, normal, large, and extra large. Screen density : The quantity […]<\/p>\n","protected":false},"author":126,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":59,"footnotes":""},"categories":[518],"tags":[],"class_list":["post-14666","post","type-post","status-publish","format-standard","hentry","category-android"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t