ButterKnife 8.0.1 @BindView 失败，nullpointerexception

ButterKnife 8.0.1 @BindView 失败，空指针异常，跟踪进去，发现是XXXFragment的 XXXFragment$$ViewBinder 的类没有生成。经过google。发现了解决方案。记录一下。

ButterKnife8.0.1 not working

Per the readme, you need to include the 

butterknife-compiler

 inorder for the generated code to be produced automatically:

buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'
}
}

apply plugin: 'com.neenbedankt.android-apt'

dependencies {
compile 'com.jakewharton:butterknife:8.0.1'
apt 'com.jakewharton:butterknife-compiler:8.0.1'
}

Without this there is no generated code to be loaded and thus none of the fields get set.You can verify ButterKnife is working by calling 

ButterKnife.setDebug(true)

 andlooking in Logcat简单的说呢。就是之前只加了

compile 'com.jakewharton:butterknife:8.0.1'

没有加上

apt 'com.jakewharton:butterknife-compiler:8.0.1'

所以要在Module的build.gradle 加上

classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

在app 的build.gradle顶部加上

apply plugin: 'com.neenbedankt.android-apt'

dependencies加上

compile 'com.jakewharton:butterknife:8.0.1'apt 'com.jakewharton:butterknife-compiler:8.0.1'