Question

我正在使用以下代码从图库中选择图片。我想从此意图跟踪int值。

val intent = Intent()
intent.type = "image/*"
intent.action = Intent.ACTION_GET_CONTENT
intent.putExtra("Position", 1)
startActivityForResult(Intent.createChooser(intent, "Select Picture"), SELECT_PICTURE)

但是当我试图从onActivityResult中的意图中获取传递的值时，我只得到默认值[0]。

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (resultCode == RESULT_OK) {
        if (requestCode == SELECT_PICTURE) {
            val selectedImageURI = data?.data
            val position = data?.getIntExtra("Position", 0)
        }
    }
}

所以我的疑问是，是否可以通过意图选择器来跟踪值？如果是，怎么办？

Answer 1

您必须在此行中使用requestCode：

startActivityForResult(Intent.createChooser(intent, "Select Picture"), requestCode)
// for example use SELECT_PICTURE_POSITION_1 as requestCode

然后您将其恢复到此处：

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (resultCode == RESULT_OK) {
        when (requestCode) {// use your request code here
            SELECT_PICTURE_POSITION_0 -> {
                          val selectedImageURI = data?.data
                          val position = data?.getIntExtra("Position", 0)
            }
            SELECT_PICTURE_POSITION_1 -> {
                          val selectedImageURI = data?.data
                          val position = data?.getIntExtra("Position", 1)
            }
            SELECT_PICTURE_POSITION_2 -> {
                          val selectedImageURI = data?.data
                          val position = data?.getIntExtra("Position", 2)
            }
            //other conditions here
        }
    }
}

使用多个请求代码来满足您的需求。

Answer 2

是否可以通过意图选择器跟踪值？

不。您的问题与选择器无关。您将得到与startActivityForResult(intent), SELECT_PICTURE)相同的结果。

startActivityForResult()开始的活动没有要求将您碰巧放入该Intent的任何其他物品退还给您。

通过Intent.createChooser传递额外内容

2 个答案: