绑定视图时，butterKnife 返回 null (8.6.0) [英] butterKnife returns null when binding view (8.6.0)

问题描述

当我尝试这样做时:

...
public class LoginActivity extends AppCompatActivity {
@BindView(R.id.login_form) View loginForm;
...

loginForm 正在获取 null.我试图遵循其他答案，但没有任何效果(例如).我也完全按照 ButterKnife 配置页面中的说明做了，但没有奏效.我做错了什么?

loginForm is getting null. I tried to follow other answers and nothing worked (this for example). I also did exactly what it said in the butterKnife configuration page and it didn't work. What am I doing wrong?

模块梯度:

apply plugin: 'com.android.application'
apply plugin: 'com.jakewharton.butterknife'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"
    defaultConfig {
        applicationId "name"
        minSdkVersion 22
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.jakewharton:butterknife:8.6.0'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.6.0'
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'uk.co.chrisjenx:calligraphy:2.3.0'
    compile 'com.android.support:design:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

项目梯度:

dependencies {
    classpath 'com.android.tools.build:gradle:2.3.3'
    classpath 'com.jakewharton:butterknife-gradle-plugin:8.6.0'

推荐答案

可能你忘记放这一行了:

Probably, you forget to put this line:

@Override 
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.simple_activity);

   ButterKnife.bind(this);
   ...
}

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