_When importing downloaded AS projects, we often encounter "Plugin with id'com.android.application'not found". This happens because the project lacks a build.grade. Com. android. application comes from com.android.tools.build:gradle:2.3.0 (version may be different). And com.android.tools.build:gradle:2.3.0 is defined in build.grade (Project **).

_. General gradle files are divided into two parts: project and module. Android's engineering structure is project-based and can add multiple modules.

build.grade(Project**)

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.0'//Here is your AS version.

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()//maven Warehouse Address
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}

build.grade(Module**)

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.0"

    defaultConfig {
        applicationId "locating.indoor.autonavi.com.onlinelocationdemo"
        minSdkVersion 18
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        ndk {
            abiFilter "armeabi"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main {
            jniLibs.srcDirs = ['libs']
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:23.0.0'
}

In this case, copy the code in build.grade(Project **) to build.grade(Module **) and TryAgain. Be careful not to forget to change your AS version.