谢谢你的检查。所以我一直在做一个项目，最终会扩展一些功能，目前我正在向Dexter申请权限(https:/github.comKarumiDexter。). 我已经能够让它工作了，当用户点击 "添加图片 "按钮时，它也会询问用户的权限，但我遇到了一个问题，我似乎无法自己解决。所以问题是，如果用户第一次打开应用程序，点击 "添加图片 "按钮，然后选择 "添加图片"。用户点击添加图片按钮，选择第一个选项。
让我们假设用户拒绝所有的权限，如果用户再次点击按钮，应用程序会再次询问权限，但这次是 "拒绝和不要再问 "的选项。而且我还建立了一个小Dialog，弹出解释为什么需要权限，并且可以引导用户进行设置。但是我发现，如果用户在第二次去的时候真的允许了权限，应用还是会弹出那个窗口，我就没能解决这个问题。用户允许权限即使用户给了权限，仍然会弹出提示音。
这是我的代码。
// Creating the variables of Calender Instance and DatePickerDialog listener to use it for date selection
// A variable to get an instance calendar using the default time zone and locale.
private var cal = Calendar.getInstance()
/* A variable for DatePickerDialog OnDateSetListener.
* The listener used to indicate the user has finished selecting a date. It will be initialized later. */
private lateinit var dateSetListener: DatePickerDialog.OnDateSetListener
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_add_happy_place)
// Adds the back button on the ActionBar
setSupportActionBar(toolbar_add_place)
supportActionBar?.setDisplayHomeAsUpEnabled(true)
toolbar_add_place.setNavigationOnClickListener {
onBackPressed()
}
// Initialize the DatePicker and sets the selected date
// https://www.tutorialkart.com/kotlin-android/android-datepicker-kotlin-example/
dateSetListener = DatePickerDialog.OnDateSetListener { _, year, month, dayOfMonth ->
cal.set(Calendar.YEAR, year)
cal.set(Calendar.MONTH, month)
cal.set(Calendar.DAY_OF_MONTH, dayOfMonth)
updateDateInView()
}
// Uses functionality in the onClick function below
et_date.setOnClickListener(this)
tv_add_image.setOnClickListener(this)
}
// This is a override method after extending the onclick listener interface (gets created automatically)
override fun onClick(v: View?) {
when (v!!.id) {
R.id.et_date -> {
DatePickerDialog(
this@AddHappyPlaceActivity, dateSetListener,
cal.get(Calendar.YEAR), cal.get(Calendar.MONTH), cal.get(Calendar.DAY_OF_MONTH)
).show()
}
R.id.tv_add_image -> {
val pictureDialog = AlertDialog.Builder(this)
pictureDialog.setTitle("Select Action")
val pictureDialogItems =
arrayOf("Select photo from gallery", "Capture photo from camera")
pictureDialog.setItems(pictureDialogItems) { _, which ->
when (which) {
0 -> choosePhotoFromGallery()
1 -> Toast.makeText(
this,
"Camera selection coming soon",
Toast.LENGTH_SHORT
).show()
}
}
pictureDialog.show()
}
}
}
// Method used for image selection from GALLERY/PHOTOS
private fun choosePhotoFromGallery() {
// Asking for permissions using DEXTER Library
Dexter.withContext(this).withPermissions(
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE,
Manifest.permission.CAMERA
).withListener(object : MultiplePermissionsListener {
override fun onPermissionsChecked(report: MultiplePermissionsReport?) {
// Here after all the permission are granted, launch the gallery to select and image.
if (report!!.areAllPermissionsGranted()) {
Toast.makeText(
this@AddHappyPlaceActivity,
"Storage READ/WRITE permission are granted. Now you can select an image from GALLERY or lets says phone storage.",
Toast.LENGTH_SHORT
).show()
}
}
override fun onPermissionRationaleShouldBeShown(
permissions: MutableList<PermissionRequest>?,
token: PermissionToken?
) {
token?.continuePermissionRequest()
showRationalDialogForPermissions()
}
}).onSameThread().check()
}
// Message to be shown if user denies access and possibly send him to the settings
private fun showRationalDialogForPermissions() {
AlertDialog.Builder(this).setMessage(
"It looks like you have turned off " +
"permissions required for this feature"
).setPositiveButton("GO TO SETTINGS")
{ _, _ ->
try {
val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS)
val uri = Uri.fromParts("package", packageName, null)
intent.data = uri
startActivity(intent)
} catch (e: ActivityNotFoundException) {
e.printStackTrace()
}
}.setNegativeButton("Cancel") { dialog, _ ->
dialog.dismiss()
}.show()
}
// A function to update the selected date in the UI with selected format.
private fun updateDateInView() {
val myFormat = "dd.MM.yyyy"
val sdf = SimpleDateFormat(myFormat, Locale.getDefault())
et_date.setText(sdf.format(cal.time).toString())
}
}
如你所见，我说的是函数 "showRationalDialogForPermissions()"，它在函数 "onPermissionRationaleShouldBeShown "中被初始化。
如果有人知道如何解决这个问题，或者有什么小窍门可以让我去试试，我将非常感激。
问好。
EDIT: 我还意识到，如果用户点击 "拒绝，不要再问"，并取消我的Dialog，应用程序似乎不会使Dialog出现后。几乎什么都没有发生。
所以我试了一些东西，我得到了一些工作（仍然有缺陷）。
我修改了以下内容。
R.id.tv_add_image -> {
val pictureDialog = AlertDialog.Builder(this)
pictureDialog.setTitle("Select Action")
val pictureDialogItems = arrayOf("Select photo from gallery", "Capture photo from camera")
pictureDialog.setItems(pictureDialogItems) {
_, which ->
when(which) {
0 -> choosePhotoFromGallery()
1 -> Toast.makeText(this, "Camera selection coming soon", Toast.LENGTH_SHORT).show()
}
}
pictureDialog.show()
addButtonClicked += 1
if (addButtonClicked > 2) {
if (ContextCompat.checkSelfPermission(this@AddHappyPlaceActivity,
Manifest.permission.CAMERA)
!= PackageManager.PERMISSION_GRANTED) {
showRationalDialogForPermissions()
}
if (ContextCompat.checkSelfPermission(this@AddHappyPlaceActivity,
Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
showRationalDialogForPermissions()
}
if (ContextCompat.checkSelfPermission(this@AddHappyPlaceActivity,
Manifest.permission.WRITE_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
showRationalDialogForPermissions()
}
}
}
这不是一个最佳的解决方案，但我只是把我创建的值递增1，一旦达到3（所以假设用户以某种方式连续拒绝了2次），就会弹出那个窗口。缺点是，你必须在给予权限后点击2次取消按钮。如果有人有什么不同的想法，或者有什么方法可以改进这个 "解决方案"，我将非常感激。