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Support library

While with gradle-based build system adding support library is as simple as adding

compile 'com.android.support:appcompat-v7:19.0.+'

inside app’s build.gradle dependencies block,
for Eclipse with ADT it should be as referenced project listed in project.properties.

E:\Android\sdk below is example location specified in you ANDROID_HOME environment variable.

sdk\extras\android\support\v7\appcompat contains template for “appcompat_v7” (android-support-v7-appcompat) project, that is copied into workspaces once you create a project, that requires support library, e.g. by setting minSdk to 8.

Contrary to m2repository extras\android\support contains only one revision of the library. So when you upgrade SDK, added “appcompat_v7” project will be copied from newer template.

Support library revision conflicts

If you have android-support-v4.jar in libs folder check that in your dependencies block fileTree has exclude:

compile fileTree(dir: ‘libs’, include: ‘.jar’, exclude: ‘android-support-.jar’)
Some gradle dependencies may have transitive dependency on support library of other revision (e.g. rev 19 while you using rev 21). Check with gradle -q dependencies and add { exclude module: 'support-v4'}, for example

compile(‘com.company:superlib:1.0.0’) { exclude module: ‘support-v4’}

See Multiple dex files define Landroid/support/v4/accessibilityservice/AccessibilityServiceInfoCompat

Other option is to to use resolutionStrategy at root build.gradle ref

allprojects {
    configurations.all((Closure) {
        resolutionStrategy {
            force 'com.android.support:support-v4:21.0.2' // your version of support library
        }
    })	
} 		

Adding sources

for Eclipse

E:\Android\sdk\extras\android\support\v7\appcompat\libs

add android-support-v4.jar.properties

src=E:\Android\sdk\extras\android\support\v4\src

and android-support-v7-appcompat.jar.properties

src=E:\Android\sources\platform_frameworks_support\v7\appcompat\src

While v4 lib sources should be once you get “Extra / Android Support Library” via SDK Manager, for v7 sources you should (from e.g. e:\Android\sources folder )

git clone https://github.com/android/platform_frameworks_support.git

For Gradle usage get “Extra / Android Support Repository”.

.aar files appear e.g. in E:\Android\sdk\extras\android\m2repository\com\android\support but again without sources.

for Android Studio

Inside app/build.gradle

apply plugin: 'idea'
idea {
    module{
        sourceDirs += file("E:\\Android\\sdk\\extras\\android\\support\\v4\\src\\")
        sourceDirs += file("E:\\Android\\sources\\platform_frameworks_support\\v7\\appcompat\\src")
    }
}