解决Android Studio 3.0.1 下使用ButterKnife 8.8.1版本出现 nullpointerexception 等异常问题

第一步：在app 的build.gradle

修改点1：

在repositories 下添加

maven {

            url "https://oss.sonatype.org/content/repositories/snapshots"

        }

修改点2：在dependencies 添加

classpath 'com.jakewharton:butterknife-gradle-plugin:9.0.0-SNAPSHOT'

修改点3：allprojects 的repositories 下添加：

  maven {

            url "https://oss.sonatype.org/content/repositories/snapshots"

        }

修改后的效果：

// Top-level build file where you can add configuration
options common to all sub-projects/modules.

buildscript {

    

    repositories {

        mavenCentral()

        maven {

            url "https://oss.sonatype.org/content/repositories/snapshots"

        }

    }

    dependencies {

        classpath 'com.android.tools.build:gradle:3.0.1'

        classpath 'com.jakewharton:butterknife-gradle-plugin:9.0.0-SNAPSHOT'

        // NOTE: Do not place your application dependencies here; they belong

        // in the individual module build.gradle files

    }

}

allprojects {

    repositories {

        google()

        jcenter()

        maven {

            url "https://oss.sonatype.org/content/repositories/snapshots"

        }

    }

}

task clean(type: Delete) {

    delete rootProject.buildDir

}

第二步：在Module的build.gradle

修改1：在根目录最外层添加：

apply
plugin: 'com.jakewharton.butterknife'

修改2：在dependencies
中添加：

implementation
'com.jakewharton:butterknife:8.8.1'

annotationProcessor
'com.jakewharton:butterknife-compiler:8.8.1'

最终效果如下：

apply
plugin: 'com.android.application'

apply plugin: 'com.jakewharton.butterknife'

android {

    compileSdkVersion 26

    defaultConfig {

        applicationId "com.example.hp.beyondtest"

        minSdkVersion 16

        targetSdkVersion 26

        versionCode 1

        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        javaCompileOptions {

            annotationProcessorOptions {

                includeCompileClasspath = true

            }

        }    }

    buildTypes {

        release {

            minifyEnabled false

            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

        }

    }

}

dependencies {

    implementation 'com.jakewharton:butterknife:8.8.1'

    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'

    implementation fileTree(dir: 'libs', include: ['*.jar'])

    implementation 'com.android.support:appcompat-v7:26.1.0'

    implementation 'com.android.support.constraint:constraint-layout:1.0.2'

    testImplementation 'junit:junit:4.12'

    androidTestImplementation 'com.android.support.test:runner:1.0.1'

    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'

}