rememberLauncherForActivityResult使用示例

需求需要跳转到 CoursexxxActivity ，选择课程，选中课程后，会将课程对象放到返回的intent中

var backIntent = Intent()
backIntent.putExtra("combiPlay", lists[position])

activity?.setResult(CourseWarmUpActivity.courseAddResult, backIntent)
activity?.finish()

那么如何启动这个Activity，并且获取返回的课程内容内

设置intent

val intent = Intent()
intent.apply {
    setClass(
        context, CourseWarmUpActivity::class.java
                                                )
                                            putExtra(
                                                "title", warmup
                                            )
                                            putExtra("tagIds", tagIds)
                                            putExtra("combiPlayTags", it.id)
                                            putExtra(
                                                "selectedCourseId", warmUpCourse?.id ?: -1
                                            )
                                            putExtra("trainerId", courseDetail.trainer?.id)
                                        }

怎么启动intent呢

需要先定义ManagedActivityResultLauncher

定义如何接收结果

val launcherAddWarmup = rememberLauncherForActivityResult(
                    contract = ActivityResultContracts.StartActivityForResult()
                ) { result ->
                    if (result.resultCode == CourseWarmUpActivity.courseAddResult) {
                        result.data?.getParcelableExtra<CourseDetails>("combiPlay")
                            ?.let { courseDetails ->
                                onWarmUpSelect.invoke(courseDetails)
                            }

                    }
                }

然后在需要启动跳转的时候

launcherAddWarmup.launch(intent)