Glide Layout Null Kotlin "must not be null"

Question

我试图在使用 Glide 单击图像时使用 activity 在单独的布局上将图像显示为全屏。相同的 Glide 代码适用于在产品详细信息中显示 activity 但不适用于全屏显示 activity。保持值不变并传递，通过打印检查，它从 firebase 获取图像 url，例如 https://firebasestorage.googleapis.com/v0/b/xxx.appspot.com/o/Product_Image1625509993393.png?alt=media&token=xxx Glide 无法显示的 xml 布局有问题。

原因：java.lang.NullPointerException：showfullimage 不能为空 在 com.shop.ui.activities.ShowFullImageActivity.loadimg(ShowFullImageActivity.kt:36) 在 com.shop.ui.activities.ShowFullImageActivity.onCreate(ShowFullImageActivity.kt:29)

onclick intent on productdetails activity:

iv_product_detail_image.setOnClickListener{
    val intent = Intent(this@ProductDetailsActivity, ShowFullImageActivity::class.java)
    intent.putExtra(Constants.PRODUCT_IMAGE, product.image)
    startActivity(intent)
}

ShowFullImageActivity.kt

class ShowFullImageActivity : BaseActivity(), View.OnClickListener {

    private var mProductImage: String = ""


    override fun onClick(p0: View?) {
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        if (intent.hasExtra(Constants.PRODUCT_IMAGE)) {
            mProductImage =
                intent.getStringExtra(Constants.PRODUCT_IMAGE)!!
        }
        println(mProductImage)

        //full screen load

        loadimg()

    }
    private fun loadimg() {

        Glide
            .with(this@ShowFullImageActivity)
        .load(mProductImage) // Uri or URL of the image
        .centerCrop() // Scale type of the image.
        .placeholder(R.drawable.ic_user_placeholder) // A default place holder if image is failed to load.
        .into(showfullimage)
    }
}

show_full_image.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".ui.activities.ShowFullImageActivity">

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:fillViewport="true"
        android:scrollbars="none"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

    <com.github.chrisbanes.photoview.PhotoView
        android:id="@+id/showfullimage"
        android:layout_width="match_parent"
        android:layout_height="@dimen/product_detail_image_height"
        android:background="@color/colorImageViewBackground"
        android:contentDescription="@string/content_description"
        android:scaleType="fitXY"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</androidx.constraintlayout.widget.ConstraintLayout>

Answer 1

你错过了这个

setContentView(R.layout.show_full_image)

没有这个所有控件都是空的。

Answer 2

1)加载View前需要setContentView

2)showfullimage在使用前需要初始化

因此您可以尝试在 ShowFullImageActivity.kt 中添加一些代码：

override fun initData() {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.show_full_image)
        showfullimage = findViewById(R.id.showfullimage)
        ...
    
}

Glide Layout Null Kotlin "must not be null"

Glide Layout Null Kotlin "must not be null"

android

kotlin

android-glide