小编iba*_*kar的帖子

我正在使用 Picassos Target 从 Internet 加载图像并从中生成调色板。当图像不再存在时，我会因 Logcat 中的错误而崩溃：

 java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter placeHolderDrawable
        at .ActivityThread.performLaunchActivity(ActivityThread.java:3260)
        at .ActivityThread.handleLaunchActivity(ActivityThread.java:3396)
        at .servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
        at .servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
        at .servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
        at .ActivityThread$H.handleMessage(ActivityThread.java:2009)
        at .Handler.dispatchMessage(Handler.java:107)
        at .Looper.loop(Looper.java:214)
        at .ActivityThread.main(ActivityThread.java:7319)
        at .reflect.Method.invoke(Native Method)
        at .os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
        at .os.ZygoteInit.main(ZygoteInit.java:934)
     Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter placeHolderDrawable
        at .LoadImage$onCreate$1.onPrepareLoad(Unknown Source:2)
        at com.squareup.picasso.RequestCreator.into(RequestCreator.java:559)
        at .LoadImage.onCreate(LoadImage.kt:154)
        **at .LoadImage.onCreate(LoadImage.kt:154)**

好的，我明白发生了什么 - Picasso 加载图像，图像为空，因此应用程序崩溃。但是我怎样才能用一行代码来处理这个问题呢？

这是发生问题的部分，我为您标记了第 154 行：

    Picasso.get()
            .load(eventimgurl)
            **.into(object : com.squareup.picasso.Target {**
                override …