Android app, MIUI compass on the source code, you can refer to learn about

Compass-master
..............\.gitignore
..............\AndroidManifest.xml
..............\NOTICE
..............\README
..............\res
..............\...\drawable-hdpi
..............\...\.............\app_icon.png
..............\...\.............\background_bottom.9.png
..............\...\.............\background_compass.png
..............\...\.............\background_light.png
..............\...\.............\background_texture.png
..............\...\.............\compass.png
..............\...\.............\compass_cn.png
..............\...\.............\degree.png
..............\...\.............\e.png
..............\...\.............\e_cn.png
..............\...\.............\miui_cover.png
..............\...\.............\n.png
..............\...\.............\n_cn.png
..............\...\.............\number_0.png
..............\...\.............\number_1.png
..............\...\.............\number_2.png
..............\...\.............\number_3.png
..............\...\.............\number_4.png
..............\...\.............\number_5.png
..............\...\.............\number_6.png
..............\...\.............\number_7.png
..............\...\.............\number_8.png
..............\...\.............\number_9.png
..............\...\.............\prompt.png
..............\...\.............\s.png
..............\...\.............\s_cn.png
..............\...\.............\w.png
..............\...\.............\w_cn.png
..............\...\drawable
..............\...\........\background.xml
..............\...\layout
..............\...\......\main.xml
..............\...\values-zh-rCN
..............\...\.............\strings.xml
..............\...\values
..............\...\......\strings.xml
..............\src
..............\...\net
..............\...\...\micode
..............\...\...\......\compass
..............\...\...\......\.......\CompassActivity.java
..............\...\...\......\.......\CompassView.java

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