Trouble implementing Android Design Support Library

Question

I have been trying to implement Android's Design Support Library without success. I have followed the steps from here . After a few issues with Warning:Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (xxx) and test app (xxx) differ. Warning:Conflict with dependency 'com.android.support:support-annotations'. Resolved versions for app (xxx) and test app (xxx) differ. I managed to fix that. However now I am getting a new error:

I will post my .gradle files below so maybe you guys can help me out. I took out everything about unit testing and instrumentation testing that were causing the initial warning.

(1)

buildscript {
repositories
        {
            mavenCentral()
        }
dependencies
        {
            classpath 'com.android.tools.build:gradle:1.3.0'
            classpath 'com.newrelic.agent.android:agent-gradle-plugin:5.+'
            classpath 'com.stanfy.spoon:spoon-gradle-plugin:1.0.2'
        }
}

allprojects
        {
        repositories
                {
                    mavenCentral()
                }
    }

(2)

 apply plugin: 'com.android.application'
apply plugin: 'newrelic'
apply plugin: 'spoon'
//apply plugin: 'jacoco' // Not working at the moment

android {
    compileSdkVersion 21
    buildToolsVersion '23.0.1'
    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 21
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
            debuggable false
            jniDebuggable false
        }
        debug {
            debuggable true
            testCoverageEnabled = false
        }
    }
    productFlavors {
        standard
        motorola
        honeywell
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
    sourceSets {
        main {
            java.srcDirs = ['src/main/java']
}
    }
    packagingOptions {
        exclude 'LICENSE.txt'
    }
}

dependencies {
    compile 'com.android.support:support-v4:23.0.1'
    compile 'com.newrelic.agent.android:android-agent:5.+'

    compile 'com.android.support:appcompat-v7:23.0.1'
    compile 'com.android.support:design:23.0.1'
    compile 'com.android.support:recyclerview-v7:23.0.1'
    compile 'com.android.support:percent:23.0.1'


    compile files('libs/redlasersdk.jar')
    provided files('libs/com.symbol.emdk.jar') // Assuming the build does not need symbols compiled
    standardCompile files('libs/com.symbol.emdk.jar')
    // Compiling the EMDK symbols for non-motorola flavors
    honeywellCompile files('libs/com.symbol.emdk.jar')
    // Compiling the EMDK symbols for non-motorola flavors
    compile files('libs/honeywell.jar')

   spoon {
    debug = true
}

 apply from: "../artifacts.gradle" 

Edit 1 : Everything in the SDK manager is up to date.

Answer 1

Use compileSdkVersion 23

Addition

Use android.support.v7.widget, Widget.Material is for minimum of SDK 21 only