Dagger2可注空

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fun provideRequestOptions(): RequestOptions { return RequestOptions() .placeholder(R.drawable.white_background) .error(R.drawable.white_background) @Provides fun provideGlideInstance(application: Application, requestOptions: RequestOptions): RequestManager{ return Glide.with(application).setDefaultRequestOptions(requestOptions) @Nullable @Provides fun provideAppDrawable(application: Application): Drawable? { return ContextCompat.getDrawable(application, R.drawable.logo)

和AuthActivity。

class AuthActivity : DaggerAppCompatActivity() {
    lateinit var binding: ActivityAuthBinding
    @Inject
    lateinit var logo: Drawable
    @Inject
    lateinit var requestManager: RequestManager
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityAuthBinding.inflate(layoutInflater)
        setContentView(binding.root)
        setLogo()
    private fun setLogo() {
        requestManager.load(logo).into(binding.loginLogo)
AppModule中的provideAppDrawable()必须返回nullableDrawable?。当我试图构建应用程序时，Dagger抱怨说它是无效的。
\AppComponent.java:7: error: [Dagger/Nullable] android.graphics.drawable.Drawable is not nullable, but is being provided by @org.jetbrains.annotations.Nullable @androidx.annotation.Nullable @Provides android.graphics.drawable.Drawable com.example.daggercodingwithmitch.di.AppModule.provideAppDrawable(android.app.Application)
public abstract interface AppComponent extends dagger.android.AndroidInjector<com.example.daggercodingwithmitch.BaseApplication> {
首先，我试着让logo中的var变成nullable，但latinit不能变成nullable。如果我不使用lateinit，并做出这样的事情。【替换代码7我就会得到关于私有字段注入的奇怪错误，尽管它不是私有的。
\AuthActivity.java:10: error: Dagger does not support injection into private fields
    private android.graphics.drawable.Drawable logo;
我怎样才能修复它？谢谢。
    android
kotlin
dagger-2
faritowich发布于 2022-08-07
3 个回答
Gowtham K K发布于 2022-08-07
0 人赞同

使标志字段成为可忽略的。Dagger不允许向非nullable字段注入nullable对象。
 @Inject
 var logo: Drawable?=null
在Java中。
@Nullable
@Inject
Drawable logo;
    
Yavor Mitev发布于 2022-08-07
0 人赞同