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'
}