Butterknife 8.4.0在重新运行应用程序后找不到视图.它得到一个NullPointerException

Question

在Android Studio Butterknife.bind(this)中重新运行应用后,无法再找到视图.到目前为止我找到的唯一可靠的解决方案是Cleaning/Rebuilding Project再次运行它.然后它再次查找视图,直到下次重新运行.到目前为止,这令人非常恼火,重建至少需要两分钟.

我有以下内容 build.gradle

android {

compileSdkVersion 24
buildToolsVersion "25.0.0"
defaultConfig {
    applicationId "xx"
    minSdkVersion 21
    targetSdkVersion 24
    versionCode x
    versionName "xxx"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    jackOptions {
        enabled true
    }
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

    }
}
packagingOptions {
    exclude 'META-INF/NOTICE' 
    exclude 'META-INF/LICENSE' 
}
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
}

dependencies {
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'
    compile 'com.jakewharton:butterknife:8.4.0'
    androidTestCompile 'com.android.support.test.espresso:espresso-core:2.2.2'
    androidTestCompile 'com.android.support.test:runner:0.5'
    androidTestCompile 'com.android.support:support-annotations:24.2.1'
    compile 'com.android.support:appcompat-v7:24.2.1'
    compile 'com.android.support:design:24.2.1'
    compile 'com.android.support:support-v13:24.2.1'
    compile 'com.android.support:support-v4:24.2.1'
    compile 'com.android.support.test.espresso:espresso-idling-resource:2.2.2'

}

我也在使用构建工具 com.android.tools.build:gradle:2.2.2

随着Butterknife.setDebug(true)我得到如下:

D/ButterKnife: Looking up binding for xx.LoginFragment
D/ButterKnife: Not found. Trying superclass xx.BaseFragment
D/ButterKnife: Not found. Trying superclass android.app.Fragment
D/ButterKnife: MISS: Reached framework class. Abandoning search.

该BaseFragment做的绑定和LoginFragment扩展它.看起来像这样

BaseFragment import android.app.Fragment;

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(getLayoutResourceId(), container, false);
        ButterKnife.setDebug(true);
        unbinder = ButterKnife.bind(this, v);
        initViews(v);
        return v;
    }

---

LoginFragment

@BindView(R.id.inputEmail)
    protected EditText inputEmail;

@Override
    protected void initViews(View v) {
        EditTextFocusListener focusListener = new EditTextFocusListener();
        inputEmail.setOnFocusChangeListener(focusListener);
    }

和堆栈跟踪

  Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.EditText.setOnFocusChangeListener(android.view.View$OnFocusChangeListener)' on a null object reference
            at xx.LoginFragment.initViews(LoginFragment.java:51)
            at xx.BaseFragment.onCreateView(BaseFragment.java:53)

正如我之前所说,目前唯一可靠的解决方案是完成clean/rebuild整个项目.这个确切的结构在使用之前工作正常jackCompiler,我不能再禁用它了.代码的主要部分取决于它.

Answer 1

这是一个临时解决方案,直到某人有更好的答案或在稳定的渠道上发布.

我改为金丝雀频道并将Android Studio升级到2.3 Canary和com.android.tools.build:gradle:2.3.0-alpha1.其他所有内容都与开幕式相同.

编辑:我最终决定禁用jackCompiler并回滚到Java 1.7.它现在稳定了.

jackOptions {
        enabled false
    } 

Answer 2

看这里。请包括以下内容：

在Gradle：

compile 'com.jakewharton:butterknife:8.4.0'

annotationProcessor 'com.jakewharton:butterknife-compiler:8.4.0'也。

这可能对你有帮助。