[英]java.lang.IllegalArgumentException: Parameter specified as non-null is null error in Java code
[英]Parameter specified as non-null is null caused by java.lang.IllegalArgumentException
拍照后,單擊相機界面上的checkmark
按鈕,出現以下異常,導致應用崩潰:
Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter data
僅當我嘗試拍照時才會發生此異常,而當我從圖庫中選擇圖像時則不會發生。
例外情況是, data
參數將作為null
傳遞,而應該non-null
並指向kotlin文件函數。 在研究了這個問題之后,我才知道我需要通過?
到所述參數。 (來源: this和this ),但是現在我得到了
Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type Intent?
我沒有與Kotlin合作的經驗,因此不確定這是否是我的正確解決方案。 如果有人遇到這樣的異常,我想知道如何解決此問題。
代碼如下:
void _checkCameraPermission() {
PermissionHandler()
.checkPermissionStatus(PermissionGroup.camera)
.then((status) {
if (status == PermissionStatus.granted) {
getImage(ImageSource.camera);
} else {
_askCameraPermission();
}
});
}
void _askCameraPermission() {
PermissionHandler()
.requestPermissions([PermissionGroup.camera]).then(_onStatusRequested);
}
void _onStatusRequested(Map<PermissionGroup, PermissionStatus> value) {
final status = value[PermissionGroup.camera];
if (status == PermissionStatus.granted) {
getImage(ImageSource.camera);
}
}
Future uploadFile(imageFile) async {
// String fileName = DateTime.now().millisecondsSinceEpoch.toString();
String fileName = "images/" + new Uuid().v4() + ".jpg";
StorageReference reference = FirebaseStorage.instance.ref().child(fileName);
StorageUploadTask uploadTask = reference.putFile(imageFile);
await uploadTask.onComplete.then((value) {
reference.getDownloadURL().then((result) {
// result is the file URL
if (result != null) {
setState(() {
isLoading = false;
});
onSendMessage(result, 2);
}
});
});
}
異常日志:
E/AndroidRuntime( 8402): FATAL EXCEPTION: main
E/AndroidRuntime( 8402): Process: com.quickcarl.qcflutterpro, PID: 8402
E/AndroidRuntime( 8402): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=2343, result=-1, data=null} to activity {com.quickcarl.qcflutterpro/com.quickcarl.qcflutterpro.MainActivity}: **java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter data**
E/AndroidRuntime( 8402): at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
E/AndroidRuntime( 8402): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
E/AndroidRuntime( 8402): at android.app.ActivityThread.-wrap16(ActivityThread.java)
E/AndroidRuntime( 8402): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
E/AndroidRuntime( 8402): at android.os.Handler.dispatchMessage(Handler.java:102)
E/AndroidRuntime( 8402): at android.os.Looper.loop(Looper.java:148)
E/AndroidRuntime( 8402): at android.app.ActivityThread.main(ActivityThread.java:5417)
E/AndroidRuntime( 8402): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime( 8402): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
E/AndroidRuntime( 8402): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
E/AndroidRuntime( 8402): Caused by: java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter data
E/AndroidRuntime( 8402): at com.quickcarl.qcflutterpro.MainActivity.onActivityResult(MainActivity.kt)
E/AndroidRuntime( 8402): at android.app.Activity.dispatchActivityResult(Activity.java:6428)
E/AndroidRuntime( 8402): at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
E/AndroidRuntime( 8402): ... 9 more
MainActivity代碼:
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) {
super.onActivityResult(requestCode, resultCode, data)
if(requestCode == VIDEO_SCREEN_REQUEST_CODE) {
if(resultCode == Activity.RESULT_OK) {
sendStringMessageToFlutter(data.getStringExtra("roomName"), "completeRoom")
}
}
}
如下更改onActivityResult
方法的簽名:
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {}
這樣可以解決問題。 data
可以為空,但您將其聲明non-null
編輯:
然后,在函數主體中,確保在檢索字符串時檢查可為空性:
if(resultCode == Activity.RESULT_OK) {
sendStringMessageToFlutter(data?.getStringExtra("roomName") ?: "default_value_when_null", "completeRoom")
}
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