Grasp important concepts contentprovider, contentresolver etc., and clearly the whole process logic. A contentprovider own implementation for beginners

contentprovider_test
....................\.classpath
....................\.project
....................\AndroidManifest.xml
....................\assets
....................\bin
....................\...\AndroidManifest.xml
....................\...\classes
....................\...\classes.dex
....................\...\.......\android
....................\...\.......\.......\support
....................\...\.......\.......\.......\v7
....................\...\.......\.......\.......\..\appcompat
....................\...\.......\.......\.......\..\.........\R$anim.class
....................\...\.......\.......\.......\..\.........\R$attr.class
....................\...\.......\.......\.......\..\.........\R$bool.class
....................\...\.......\.......\.......\..\.........\R$color.class
....................\...\.......\.......\.......\..\.........\R$dimen.class
....................\...\.......\.......\.......\..\.........\R$drawable.class
....................\...\.......\.......\.......\..\.........\R$id.class
....................\...\.......\.......\.......\..\.........\R$integer.class
....................\...\.......\.......\.......\..\.........\R$layout.class
....................\...\.......\.......\.......\..\.........\R$string.class
....................\...\.......\.......\.......\..\.........\R$style.class
....................\...\.......\.......\.......\..\.........\R$styleable.class
....................\...\.......\.......\.......\..\.........\R.class
....................\...\.......\com
....................\...\.......\...\example
....................\...\.......\...\.......\contentprovider_test
....................\...\.......\...\.......\....................\BuildConfig.class
....................\...\.......\...\.......\....................\ContentData$Usertable.class
....................\...\.......\...\.......\....................\ContentData.class
....................\...\.......\...\.......\....................\Databasehelper.class
....................\...\.......\...\.......\....................\MainActivity$InsertListener.class
....................\...\.......\...\.......\....................\MainActivity$QueryListener.class
....................\...\.......\...\.......\....................\MainActivity.class
....................\...\.......\...\.......\....................\R$anim.class
....................\...\.......\...\.......\....................\R$attr.class
....................\...\.......\...\.......\....................\R$bool.class
....................\...\.......\...\.......\....................\R$color.class
....................\...\.......\...\.......\....................\R$dimen.class
....................\...\.......\...\.......\....................\R$drawable.class
....................\...\.......\...\.......\....................\R$id.class
....................\...\.......\...\.......\....................\R$integer.class
....................\...\.......\...\.......\....................\R$layout.class
....................\...\.......\...\.......\....................\R$menu.class
....................\...\.......\...\.......\....................\R$string.class
....................\...\.......\...\.......\....................\R$style.class
....................\...\.......\...\.......\....................\R$styleable.class
....................\...\.......\...\.......\....................\R.class
....................\...\.......\...\.......\....................\TestProvider.class
....................\...\contentprovider_test.apk
....................\...\dexedLibs
....................\...\.........\android-support-v4-59c05f10755bbdd616eb868f124f41cb.jar
....................\...\.........\android-support-v7-appcompat-e6d703f956a120347a77c2ce3c59e7c7.jar
....................\...\.........\appcompat_v7-b28af6634fe263745e072bf12628d046.jar
....................\...\R.txt
....................\...\res
....................\...\resources.ap_
....................\...\...\crunch
....................\...\...\......\drawable-hdpi
....................\...\...\......\.............\ic_launcher.png
............

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