Kotlin 中如何使用 Picasso 将 URL 转换为位图？

Posted 2023-05-07

【中文标题】Kotlin 中如何使用 Picasso 将 URL 转换为位图？

【英文标题】：How to use Picasso to convert URL to Bitmap in Kotlin?

【发布时间】：2021-11-18 11:14:01

【问题描述】：

我想在 google api 中更改我的标记。 所以我用毕加索的“getBitmap”功能 但是这个函数返回“位图？”

.icon(BitmapDescriptorFactory.fromBitmap(getBitmap(user_URL[i]))) -> 需要“位图”类型

所以，问题是：

类型不匹配错误（需要：位图，找到：位图？） java.lang.NullPointerException：同一行中的图像不能为空

如何在 kotlin 中解决这个问题？

代码：

私人乐趣 getBitmap(url : String) : 位图？

    var bmp : Bitmap ?=null
    Picasso.get().load(url).into(object : com.squareup.picasso.Target 
        override fun onBitmapLoaded(bitmap: Bitmap?, from: Picasso.LoadedFrom?) 
            bmp =  bitmap
        

        override fun onPrepareLoad(placeHolderDrawable: Drawable?) 

        override fun onBitmapFailed(e: Exception?, errorDrawable: Drawable?) 
    )
    return bmp

私人乐趣 otherUserMaker(googleMap: GoogleMap)

    var latitude = mutableListOf<Double>()
    var longitude = mutableListOf<Double>()
    var user_URL = mutableListOf<String>()enter code here

    user_URL = maprepo.returnImage()
    latitude = maprepo.returnLatitude()
    longitude = maprepo.returnLongitude()

    for (i in 0 until latitude.size step (1)) 

        val makerOptions = MarkerOptions()
        makerOptions
            .position(LatLng(latitude[i], longitude[i]))
            .title("")           .icon(BitmapDescriptorFactory.fromBitmap(getBitmap(user_URL[i])))


        googleMap.addMarker(makerOptions)

      
    

firebase 中的 imageURL 类型 mustablearray[String]

和maprepo图像功能是

fun getImage(boardDTOId: MutableList<String>) 
    for (i in boardDTOId) 
        firestore.collection("Board").document(i).get().addOnSuccessListener 

            if (it != null) 
                photoUrl.add(it["profileUrl"] as String)
            
        
    

有趣的 returnImage(): MutableList 返回照片网址

================================================ ==============================

user_URL 数据集

for (i in 0 until latitude.size step (1)) Log.e("user_Url", user_URL.toString()) Log.e("user_Url1", user_URL[i])

-> 日志

021-09-26 03:12:36.810 20861-20861/com.example.myapplication E/user_Url：[https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o /Profiles%2FJPEG_20210925_202119_.png?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_2021.png ?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f, https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_195916_.png?alt=media&token=1fbae93b -85d4-447d-a8f8-008110423616，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210922_200319_.png?alt=media&token=b0a27498-382e-4cee-b268 -1a7ba89ad0e7]

2021-09-26 03:12:36.810 20861-20861/com.example.myapplication E/user_Url1:https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_202119_.png?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f

2021-09-26 03:12:36.819 20861-20861/com.example.myapplication E/user_Url：[https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o /Profiles%2FJPEG_20210925_202119_.png?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_2021.png ?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f, https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_195916_.png?alt=media&token=1fbae93b -85d4-447d-a8f8-008110423616，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210922_200319_.png?alt=media&token=b0a27498-382e-4cee-b268 -1a7ba89ad0e7]

2021-09-26 03:12:36.819 20861-20861/com.example.myapplication E/user_Url1:https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_202119_.png?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f

2021-09-26 03:12:36.832 20861-20861/com.example.myapplication E/user_Url：[https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o /Profiles%2FJPEG_20210925_202119_.png?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_2021.png ?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f, https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_195916_.png?alt=media&token=1fbae93b -85d4-447d-a8f8-008110423616，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210922_200319_.png?alt=media&token=b0a27498-382e-4cee-b268 -1a7ba89ad0e7]

2021-09-26 03:12:36.832 20861-20861/com.example.myapplication E/user_Url1:https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_195916_.png?alt=media&token=1fbae93b-85d4-447d-a8f8-008110423616

2021-09-26 03:12:36.843 20861-20861/com.example.myapplication E/user_Url：[https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o /Profiles%2FJPEG_20210925_202119_.png?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_2021.png ?alt=media&token=2b35d88f-c748-4faf-bc5b-a809294a4d4f, https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210925_195916_.png?alt=media&token=1fbae93b -85d4-447d-a8f8-008110423616，https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210922_200319_.png?alt=media&token=b0a27498-382e-4cee-b268 -1a7ba89ad0e7]

2021-09-26 03:12:36.843 20861-20861/com.example.myapplication E/user_Url1:https://firebasestorage.googleapis.com/v0/b/capston-e8850.appspot.com/o/Profiles%2FJPEG_20210922_200319_.png?alt=media&token=b0a27498-382e-4cee-b268-1a7ba89ad0e7

【问题讨论】：

分享你的代码。

@jyk 尝试以文本格式而不是图像发布代码

检查这个Answer，我想这会对你有所帮助

【参考方案1】：

简短而简单的方法是

val bitmap: Bitmap = Picasso.with(context).load(url).get()

【讨论】：

感谢 andswer 但“java.lang.IllegalStateException：方法调用不应该从主线程发生。”在这里

你的图片是空的，它没有初始化

以文本形式发布所有代码和错误

我上传了我的代码

图像声明在哪里