[안드로이드/Android] 갤러리 접근 허용 및 띄우기(MVVM, 이벤트 처리)

AndroidManifest.xml

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>

다음 내용을 추가한다.

SingleLiveEvent에 대한 내용은
https://velog.io/@dustndus8/%EC%95%88%EB%93%9C%EB%A1%9C%EC%9D%B4%EB%93%9CAndroid-MVVM-%EC%9D%B4%EB%B2%A4%ED%8A%B8-%EC%B2%98%EB%A6%AC-ovw9fsa1
참조

ExampleViewModel.kt

class RegisterEventsViewModel : ViewModel() {

	val startGalleryClickEvent = SingleLiveEvent<Any>()

	fun onImageButtonClick() {
		startGalleryClickEvent.call()
	}

}

activity_example.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>
    <data>
        <variable
            name="registerViewModel"
            type="org.inu.events.viewmodel.RegisterEventsViewModel" />
    </data>

...

<ImageButton
		android:id="@+id/imageButton_postImage"
    android:layout_width="56dp"
    android:layout_height="56dp"
    android:layout_marginStart="16dp"
    android:layout_marginTop="8dp"
    android:background="@drawable/img_btn_background"
    android:onClick="@{ () -> registerViewModel.onImageButtonClick()}"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/textView_postImage" />

onnClick에

android:onClick="@{ () -> registerViewModel.onImageButtonClick()}"

다음과 같이 작성해준다.

class RegisterEventsActivity : AppCompatActivity() {
	private val PERMISSION_ALBUM = 101
	private val REQUEST_STORAGE = 1000

	private lateinit var registerModel: RegisterEventsViewModel
  private lateinit var binding: RegisterEventsBinding

  override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = DataBindingUtil.setContentView(this, R.layout.register_events)
        registerModel = RegisterEventsViewModel()
        binding.registerViewModel = registerModel
        binding.lifecycleOwner = this

        initAddPhotoButton()
    }

private fun initAddPhotoButton() {
        registerModel.startGalleryClickEvent.observe(this, {
            Log.i("BUTTON", "initAdd")
            when {
                ContextCompat.checkSelfPermission(
                    this,
                    android.Manifest.permission.READ_EXTERNAL_STORAGE
                ) == PackageManager.PERMISSION_GRANTED -> {
                    navigatePhotos()
                    Log.i("BUTTON", "navigate")
                }
                shouldShowRequestPermissionRationale(android.Manifest.permission.READ_EXTERNAL_STORAGE) -> {
                    showPermissionContextPopup()
                    Log.i("BUTTON", "showpermission")
                }
                else -> {
                    requestPermissions(
                        arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE),
                        REQUEST_STORAGE
                    )
                    Log.i("BUTTON", "else")
                }
            }

        }
        )
    }

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        if (resultCode != Activity.RESULT_OK) {
            return
        }

        when (requestCode) {
            REQUEST_STORAGE -> {
                val selectedImageUri: Uri? = data?.data
                if (selectedImageUri != null) {
                    selectedImageUri?.let { uri ->
                        //imageview.setImageURI(uri)
                    }

                } else {
                    Toast.makeText(this, "사진을 가져오지 못했습니다.", Toast.LENGTH_SHORT).show()
                }
            }
        }

    }

override fun onRequestPermissionsResult(
        requestCode: Int,
        permissions: Array<out String>,
        grantResults: IntArray
    ) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        when (requestCode) {
            REQUEST_STORAGE -> {
                if (grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    // todo 권한이 부여된 것입니다.
                    navigatePhotos()
                } else {
                    Toast.makeText(this, "권한을 거부하였습니다.", Toast.LENGTH_SHORT).show()
                }
            }
            else -> {

            }
        }
    }

private fun navigatePhotos() {
        val intent = Intent(Intent.ACTION_GET_CONTENT)
        intent.type = "image/*"
        startActivityForResult(intent, REQUEST_STORAGE)
    }

private fun showPermissionContextPopup() {
        AlertDialog.Builder(this)
            .setTitle("권한이 필요합니다.")
            .setMessage("앱에서 사진을 불러오기 위해 권한이 필요합니다.")
            .setPositiveButton("동의") { _, _ ->
                requestPermissions(
                    arrayOf(android.Manifest.permission.READ_EXTERNAL_STORAGE),
                    PERMISSION_ALBUM
                )
            }
            .setNegativeButton("취소") { _, _ -> }
            .create()
            .show()
    }
	
}

기록용으로 작성되었음

참고한 코드

https://jhg3410.tistory.com/42

https://stickode.tistory.com/310