Android : Errors while porting project to Android Studio?

I'm new to Android Studio, I've been using Eclipse for about 2 years. I've trying understanding these solutions.

Android gradle build Error:(9, 0) Gradle DSL method not found: 'compile()'.

Gradle DSL method not found: 'compile()'

I just can't get it to work.

Here's what it says..

Error:(17, 0) Gradle DSL method not found: 'compile()' Possible causes:

• The project 'clxxxii - PMv5' may be using a version of Gradle that does not contain the method. Open Gradle wrapper file


• The build file may be missing a Gradle plugin. Apply Gradle plugin

Here's the file where it's giving an error

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.0'    }
}

allprojects {
    repositories {
        mavenCentral()
    }
}
dependencies {
    apply plugin: 'announce'
    compile 'com.android.support:appcompat-v7:21.0.0'
    compile 'com.android.support:cardview-v7:21.0.+'
}

And based on the other questions, you may need this too.

apply plugin: 'android'

android {
    compileSdkVersion 17
    buildToolsVersion "19.0.3"

    defaultConfig {
        minSdkVersion 8
        targetSdkVersion 19
    }

    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:+'
    compile files('libs/FlurryAnalytics_3.3.0.jar')
    compile files('libs/heyzap-ads-sdk.jar')
    compile files('libs/HomeBaseSDK2.2.jar')
    compile files('libs/placed-persistent-sdk-1.10.jar')
    compile files('libs/revmob-6.7.0.jar')
}

Can someone help me understand what the problem is, and why it's happening?