Android Error: null, Cannot fit requested classes in a single dex file

方法数大于最大数，要分包处理，分三步走：

1，导入依赖

 implementation 'com.android.support:multidex:1.0.3'

2，修改Application

 

 MyApplication extends MultiDexApplication

 @Override
    protected void attachBaseContext(Context base) {
        super.attachBaseContext(base);
        MultiDex.install(this);
    }

3，添加config

 defaultConfig {
        applicationId "***"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 1
        versionName "1.0.0"
        multiDexEnabled true
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }


  multiDexEnabled true!!!!!