buildTypes {
        debug {
            buildConfigField("boolean","IS_DEBUG","true")
        }
        release {
            buildConfigField("boolean","IS_DEBUG","false")
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

public class LogUtils {
    //获取当前APK生成模式
    //分为调试版本和正式版本。日志是用来调整程序的，一般正式的应用不允许输出日志，通过混淆来控制，获取当前状态
    public static final boolean DEBUG = BuildConfig.IS_DEBUG;
    public static void logi(String TAG,String msg){
        if(DEBUG){
            Log.i(TAG, ""+msg);
        }
    }
}