Cannot fit requested classes in a single dex file (# methods: 66661 > 65536)

Cannot fit requested classes in a single dex file (# methods: 66661 > 65536)

原因：dex文件中方法过多；

解决：推荐引入使用MultiDex包解决

1 引入依赖api 'androidx.multidex:multidex:2.0.1'（版本可选）

2 app的build.gradle中加入multiDexEnabled true

defaultConfig {
    applicationId "com.xx.xxxx"
    minSdkVersion 19
    targetSdkVersion 29
    versionCode 1
    versionName "1.0"

    //写在这里~
    multiDexEnabled true

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"


}

3 application中加入multiDex.install（提醒：application要加入到AndroidManiFest中去）

 override fun attachBaseContext(base: Context?) {
        super.attachBaseContext(base)
        MultiDex.install(this)
    }