Kotlin片段:尝试对null对象引用调用虚拟方法“”java.lang.String android.content.Context.getPackageName()“”
Kotlin片段:尝试对null对象引用调用虚拟方法“”java.lang.String android.content.Context.getPackageName()“”
提问于 2020-07-02 09:04:18
我使用Intent.ACTION_PICK从画廊拍照。我在实现这两个活动时已经成功了，但在使用fragment时发现了问题。我需要一些帮助，谢谢。
这里是MainActivity.kt
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == Activity.RESULT_OK) {
when (requestCode) {
REQUEST_NEW_CHAT -> {
val name: String = data?.getStringExtra(PARAM_NAME) ?: ""
val phone: String = data?.getStringExtra(PARAM_PHONE) ?: ""
checkNewChatUser(name, phone)
}
//TODO: I.5. Update Status Page
REQUEST_CODE_PHOTO -> statusUpdateFragment?.storeImage(data?.data)
}
}
}这里是StatusUpdateFragment.kt
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
lay_progressbar.setOnTouchListener { v, event -> true }
btn_status.setOnClickListener { onUpdate() }
populateImage(context, imageUrl, img_status)
lay_status.setOnClickListener{
if(isAdded){
(activity as MainActivity).startNewActivity(REQUEST_CODE_PHOTO)
}
}
}
fun storeImage(imageUri: Uri?) {
if (imageUri != null && userId != null) {
//error message : Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
try {
Toast.makeText(activity, "Uploading...", Toast.LENGTH_SHORT).show()
lay_progressbar.visibility = View.VISIBLE
}
catch (e:Exception){
e.message
}
/*more code that i hide it...*/
}
}回答 1
Stack Overflow用户
发布于 2020-07-02 09:59:15
真主啊，我已经被法鲁解决了。
MainActivity.kt :必须在onActivityResult添加此内容
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
if (resultCode == Activity.RESULT_OK) {
when (requestCode) {
REQUEST_NEW_CHAT -> {
val name: String = data?.getStringExtra(PARAM_NAME) ?: ""
val phone: String = data?.getStringExtra(PARAM_PHONE) ?: ""
checkNewChatUser(name, phone)
}
//TODO: I.5. Update Status Page
REQUEST_CODE_PHOTO -> statusUpdateFragment?.storeImage(data?.data,this)
}
}
}StatusUpdateFragment.kt :必须在storeImage添加上下文
fun storeImage(imageUri: Uri?，context: Context) {
if (imageUri != null && userId != null) { try { Toast.makeText(context, "Uploading...", Toast.LENGTH_SHORT).show() lay_progressbar.visibility = View.VISIBLE } catch (e:Exception){ e.message }//more code hidden}
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/62687446
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