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Android - What does the number 22 in - com.android.support:appcompat-v7:22.2.1?

What does the number 22 in the file build.gradle mean - com.android.support:appcompat-v7:22.2.1?
Part file build.gradle
dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', { exclude group: 'com.android.support', module: 'support-annotations' }) compile 'com.android.support:appcompat-v7:22.2.1' testCompile 'junit:junit:4.12' }

v22 is the api level.
com.android.support:appcompat-v7:22.2.1 is the support library for Android Lollipop 5.1

Android libraries: versions conflict issue

I've the below dependence in my Android app build.gradle
compileSdkVersion 25
buildToolsVersion "25.0.2"
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:design:25.0.0'
compile 'com.android.support:appcompat-v7:25.0.0'
compile 'com.google.android.gms:play-services:10.0.1'
compile 'com.google.firebase:firebase-core:10.0.1'
compile 'com.google.firebase:firebase-messaging:10.0.1'
compile 'com.firebase:firebase-jobdispatcher-with-gcm-dep:0.6.0'
compile 'com.google.firebase:firebase-appindexing:10.0.1'
compile 'com.google.firebase:firebase-ads:10.0.1'
testCompile 'junit:junit:4.12'
compile 'com.android.support:multidex:1.0.1'
}
but getting an error about versions compatibility, as shown below, what is the one to be changed here, i could not figure it out :(

I had same problem what i did was compile the higher version of libraries ,which were creating this error,in app:gradle only.
for example in your case
compile 'com.android.support:mediarouter-v7:25.0.0'
Add this in app:gradle.
There may be more like this mediarouter libraries if it still give error add them jst like this(making them higher version).

First you need to find out where's what consists of a conflicting version of the library. The easiest way to do so is to:
Open Terminal pane in your Android Studio.
Type in: ./gradlew androidDependencies
Find the row that represents the ENCLOSING library consisting of a conflict.
Then just use exclude statement for the conflicting library, like so:
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
(the example assuming com.android.support.test.espresso:espresso-core:2.2.2 was the ENCLOSING library, and com.android.support:support-annotations being the conflict)

Unable to use Snackbar after updating Android Studio

I have recently updated my Android Studio version to 2.3
I am working on a project now and I've noticed that I am unable to import Snackbar class. I never had that problem before.
I can use it by adding compile 'com.nispok:snackbar:2.6.1' and I can import it then, but I don't think I should have to do that instead of just using Android's android.support.design.widget.Snackbar;
This is are my dependencies from build.gradle:
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.2.0'
compile 'com.google.firebase:firebase-database:10.0.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
}
I have also tried to play around with DataBinding concept in my project but I don't think this could cause that issue?
Thank you.

You are missing the compile 'com.android.support:design:25.2.0' in your dependencies. As the library is not added you are unable to get the Snackbar class.

How to compare two intent using assertj-android

Hi I am using roboelectric for unit testing of my android application. I want to compare expected intent and actual intent using assertj-android. I have added required dependency of assertj-android, even though I have done Gradle sync multiple times but still unable to import org.assertj.android.api.content.IntentAssert.
What could be the issue ? Any idea ? Thanks in advance
build.gradle
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.1'
testCompile 'junit:junit:4.12'
testCompile 'org.robolectric:robolectric:3.2.2'
testCompile 'org.khronos:opengl-api:gl1.1-android-2.1_r1'
androidTestCompile 'com.squareup.assertj:assertj-android:1.1.1'
}

AssertJ dependency in your build.gradle is for androidTest and it should be for test since you're using Robolectric?

Authorizing google API error

I'm trying to Authorizing and using googel API for android but when I try to configure build dependencies and sync the project it give me an error like
Error:Execution failed for task ':app:prepareDebugAndroidTestDependencies'.> Dependency Error.
See console for details.
build gradle (app):
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:24.2.1'
testCompile 'junit:junit:4.12'
compile 'com.google.android.gms:play-services-auth:10.2.0'
compile 'com.google.api-client:google-api-client:1.22.0'
compile 'com.google.api-client:google-api-client-android:1.22.0'
compile 'com.google.apis:google-api-services-people:v1-rev4-1.22.0'
how can I solve this?

Not sure, but I think your google apis are conflicting
compile 'com.google.android.gms:play-services-auth:10.2.0'
and
compile 'com.google.api-client:google-api-client:1.22.0'
Might internally be using other dependencies, with different versions.
Try running: /gradlew app:dependencies to see all your dependencies