android tutorial - Seeing dependency tree in Android | Developer android - android app development - android studio - android app developement

Use the task dependencies. Depending on how your modules are set up, it may be either ./gradlew dependencies or to see the dependencies of module app use ./gradlew :app:dependencies

The example following build.gradle file

dependencies {
    compile 'com.android.support:design:23.2.1'
    compile 'com.android.support:cardview-v7:23.1.1'

    compile 'com.google.android.gms:play-services:6.5.87'
}

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will produce the following graph:

Parallel execution is an incubating feature.
:app:dependencies

------------------------------------------------------------
Project :app
------------------------------------------------------------
. . .
_releaseApk - ## Internal use, do not manually configure ##
+--- com.android.support:design:23.2.1
|    +--- com.android.support:support-v4:23.2.1
|    |    \--- com.android.support:support-annotations:23.2.1
|    +--- com.android.support:appcompat-v7:23.2.1
|    |    +--- com.android.support:support-v4:23.2.1 (*)
|    |    +--- com.android.support:animated-vector-drawable:23.2.1
|    |    |    \--- com.android.support:support-vector-drawable:23.2.1
|    |    |         \--- com.android.support:support-v4:23.2.1 (*)
|    |    \--- com.android.support:support-vector-drawable:23.2.1 (*)
|    \--- com.android.support:recyclerview-v7:23.2.1
|         +--- com.android.support:support-v4:23.2.1 (*)
|         \--- com.android.support:support-annotations:23.2.1
+--- com.android.support:cardview-v7:23.1.1
\--- com.google.android.gms:play-services:6.5.87
     \--- com.android.support:support-v4:21.0.0 -> 23.2.1 (*)

. . .

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Here you can see the project is directly including com.android.support:design version 23.2.1, which itself is bringing com.android.support:support-v4 with version 23.2.1.
However, com.google.android.gms:play-services itself has a dependency on the same support-v4 but with an older version 21.0.0, which is a conflict detected by gradle.