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一、適配多分辨率
1.官網(wǎng)介紹: http://developer.android.com/guide/practices/screens_support.html#qualifiers
Screen characteristic | Qualifier | Description |
---|---|---|
Size | small | Resources for small size screens. |
normal | Resources for normal size screens. (This is the baseline size.) | |
large | Resources for large size screens. | |
xlarge | Resources for extra large size screens. | |
Density | ldpi | Resources for low-density (ldpi) screens (~120dpi). |
mdpi | Resources for medium-density (mdpi) screens (~160dpi). (This is the baseline density.) | |
hdpi | Resources for high-density (hdpi) screens (~240dpi). | |
xhdpi | Resources for extra high-density (xhdpi) screens (~320dpi). | |
nodpi | Resources for all densities. These are density-independent resources. The system does not scale resources tagged with this qualifier, regardless of the current screen's density. | |
tvdpi | Resources for screens somewhere between mdpi and hdpi; approximately 213dpi. This is not considered a "primary" density group. It is mostly intended for televisions and most apps shouldn't need it—providing mdpi and hdpi resources is sufficient for most apps and the system will scale them as appropriate. If you find it necessary to provide tvdpi resources, you should size them at a factor of 1.33*mdpi. For example, a 100px x 100px p_w_picpath for mdpi screens should be 133px x 133px for tvdpi. | |
Orientation | land | Resources for screens in the landscape orientation (wide aspect ratio). |
port | Resources for screens in the portrait orientation (tall aspect ratio). | |
Aspect ratio | long | Resources for screens that have a significantly taller or wider aspect ratio (when in portrait or landscape orientation, respectively) than the baseline screen configuration. |
notlong | Resources for use screens that have an aspect ratio that is similar to the baseline screen configuration. |
關于布局文件適配的一些示例:
res/layout/my_layout.xml // layout for normal screen size ("default")
res/layout-small/my_layout.xml // layout for small screen size
res/layout-large/my_layout.xml // layout for large screen size
res/layout-xlarge/my_layout.xml // layout for extra large screen size
res/layout-xlarge-land/my_layout.xml // layout for extra large in landscape orientation
res/drawable-mdpi/my_icon.png // bitmap for medium density
res/drawable-hdpi/my_icon.png // bitmap for high density
res/drawable-xhdpi/my_icon.png // bitmap for extra high density
密度與尺寸定義的大概圖示:
2.關于屏幕大小的定義:
xlarge screens are at least 960dp x 720dp
large screens are at least 640dp x 480dp
normal screens are at least 470dp x 320dp
small screens are at least 426dp x 320dp
在項目實作中,遇到一個問題,要對HVGA(320 * 480 px, density = 160), WVGA(480*800 px, density = 240) 和 QHD (540*960 px, density = 240) 進行適配, 換算成dp后,可以看到三種分辨率都是屬于values-normal范圍的,這下麻煩了,這三種屏幕尺寸差異很大,界面適配上必須要對應不同的值,怎么辦呢?
解決方法很簡單,實際上qualifier是可以配置多個的,之間以"-"連接。
將values-normal 分成兩個目錄,即values-normal-mdpi, values-normal-hdpi, 其下分別對應相應的dimens.xml即可。values-normal-mdpi 對應 HVGA, values-normal-hdpi對應WVGA和QHD。
3.圖標大小的設定
針對不同密度創(chuàng)建的圖標,你應該遵循四個廣義密度之間的3:4:6:8縮放比例。例如,如果你有一個48 x48像素的圖標對應于mdpi,則其他尺寸應該是:
36x36 for low-density
48x48 for medium-density
72x72 for high-density
96x96 for extra high-density
4.比較典型的屏幕寬度尺寸
320dp: a typical phone screen (240x320 ldpi, 320x480 mdpi, 480x800 hdpi, etc).
480dp: a tweener tablet like the Streak (480x800 mdpi).
600dp: a 7” tablet (600x1024 mdpi).
720dp: a 10” tablet (720x1280 mdpi, 800x1280 mdpi, etc).
5.尺寸與密度的一般對應
Low density (120), ldpi | Medium density (160), mdpi | High density (240), hdpi | Extra high density (320), xhdpi | |
---|---|---|---|---|
Smallscreen | QVGA (240x320) | 480x640 | ||
Normalscreen | WQVGA400 (240x400) WQVGA432 (240x432) | HVGA (320x480) | WVGA800 (480x800) WVGA854 (480x854) 600x1024 | 640x960 |
Largescreen | WVGA800** (480x800) WVGA854** (480x854) | WVGA800* (480x800) WVGA854* (480x854) 600x1024 | ||
Extra Largescreen | 1024x600 | WXGA (1280x800) |
6.一個比較有代表性的軟件資源包結構圖
7.drawable-nodpi的作用
把一些不能被拉伸的圖片放在 drawable-nodpi 中,此圖片將不會被放大,以原大小顯示。
但是寬和高要寫wrap_content,不要寫dip。
8.配置AndroidManifest.xml使應用支持多分辨率
<supports-screens android:largeScreens="true" android:normalScreens="true" android:smallScreens="true" android:anyDensity="true"/>
9.Android屏幕圖標尺寸一般規(guī)范
(1). 程序啟動圖標:
ldpi (120 dpi) 小屏 36 x 36 px
mdpi (160 dpi) 中屏 48 x 48 px
hdpi (240 dpi) 大屏 72 x 72 px
xhdpi (320 dpi) 特大屏 96 x 96 px
(2).底部菜單圖標
大屏:
1. 完整圖片(紅色): 72 x 72 px
2. 圖標(藍色): 48 x 48 px
3. 圖標外邊框(粉色): 44 x 44 px
中屏:
1. 完整圖片: 48 x 48 px
2. 圖標: 32 x 32 px
3. 圖標外邊框: 30 x 30 px
小屏:
1. 完整圖片: 36 x 36 px
2. 圖標: 24 x 24 px
3. 圖標外邊框: 22 x 22 px
(3). 彈出對話框頂部圖標
Low density screen (ldpi) 小屏 24 x 24 px
Medium density screen (mdpi) 中屏 32 x 32 px
High density screen (hdpi) 大屏 48 x 48 px
(4). 長列表內(nèi)部列表項圖標
Low density screen (ldpi) 小屏 24 x 24 px
Medium density screen (mdpi) 中屏 32 x 32 px
High density screen (hdpi) 大屏 48 x 48 px
(5). 底部或頂部tab標簽圖標
大屏 (hdpi):
1. 完整圖片(紅色): 48 x 48 px
2. 圖標(藍色): 42 x 42 px
中屏 (mdpi):
1. 完整圖片: 32 x 32 px
2. 圖標: 28 x 28 px
小屏(ldpi):
1. 完整圖片: 24 x 24 px
2. 圖標: 22 x 22 px
(6). 底部狀態(tài)欄圖標
ldpi (120 dpi) 小屏 18 x 18 px
mdpi (160 dpi) 中屏 24 x 24 px
hdpi (240 dpi) 大屏 36 x 36 px
xhdpi (320 dpi) 特大屏 48 x 48 px
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