From 97dac704bcc5f4dc441f0d31c4a680235ad50e2e Mon Sep 17 00:00:00 2001
From: Torsten Grote <t@grobox.de>
Date: Fri, 26 Jun 2020 14:15:34 -0300
Subject: [anastasis] ask for permission to fill in phone number automatically

---
 .../main/java/org/gnu/anastasis/ui/MainActivity.kt |  2 +
 .../gnu/anastasis/ui/authentication/SmsFragment.kt | 50 ++++++++++++++++++++++
 2 files changed, 52 insertions(+)

(limited to 'anastasis-ui/src/main/java/org/gnu')

diff --git a/anastasis-ui/src/main/java/org/gnu/anastasis/ui/MainActivity.kt b/anastasis-ui/src/main/java/org/gnu/anastasis/ui/MainActivity.kt
index 3ca3224..ac355c1 100644
--- a/anastasis-ui/src/main/java/org/gnu/anastasis/ui/MainActivity.kt
+++ b/anastasis-ui/src/main/java/org/gnu/anastasis/ui/MainActivity.kt
@@ -24,6 +24,8 @@ import androidx.navigation.ui.AppBarConfiguration
 import androidx.navigation.ui.setupWithNavController
 import kotlinx.android.synthetic.main.activity.*
 
+internal const val PERMISSION_REQUEST_CODE = 1
+
 class MainActivity : AppCompatActivity() {
 
     private lateinit var nav: NavController
diff --git a/anastasis-ui/src/main/java/org/gnu/anastasis/ui/authentication/SmsFragment.kt b/anastasis-ui/src/main/java/org/gnu/anastasis/ui/authentication/SmsFragment.kt
index 2ceb422..f20fba5 100644
--- a/anastasis-ui/src/main/java/org/gnu/anastasis/ui/authentication/SmsFragment.kt
+++ b/anastasis-ui/src/main/java/org/gnu/anastasis/ui/authentication/SmsFragment.kt
@@ -16,10 +16,16 @@
 
 package org.gnu.anastasis.ui.authentication
 
+import android.Manifest
+import android.annotation.SuppressLint
+import android.content.pm.PackageManager.PERMISSION_GRANTED
 import android.os.Bundle
+import android.telephony.TelephonyManager
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import androidx.annotation.RequiresPermission
+import androidx.core.content.ContextCompat
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.navigation.fragment.findNavController
@@ -27,8 +33,11 @@ import com.google.android.material.transition.MaterialContainerTransform
 import com.google.android.material.transition.MaterialContainerTransform.FADE_MODE_CROSS
 import kotlinx.android.synthetic.main.fragment_sms.*
 import org.gnu.anastasis.ui.MainViewModel
+import org.gnu.anastasis.ui.PERMISSION_REQUEST_CODE
 import org.gnu.anastasis.ui.R
 
+private const val PERMISSION = Manifest.permission.READ_PHONE_STATE
+
 class SmsFragment : Fragment() {
 
     private val viewModel: MainViewModel by activityViewModels()
@@ -46,10 +55,51 @@ class SmsFragment : Fragment() {
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        smsView.editText?.setOnFocusChangeListener { _, hasFocus ->
+            if (hasFocus) checkPerm()
+        }
         saveSmsButton.setOnClickListener {
             viewModel.smsChecked.value = true
             findNavController().popBackStack()
         }
     }
 
+    private fun checkPerm() = when {
+        ContextCompat.checkSelfPermission(requireContext(), PERMISSION)
+                == PERMISSION_GRANTED -> {
+            // You can use the API that requires the permission.
+            fillPhoneNumber()
+        }
+        shouldShowRequestPermissionRationale(PERMISSION) -> {
+            // In an educational UI, explain to the user why your app requires this
+            // permission for a specific feature to behave as expected. In this UI,
+            // include a "cancel" or "no thanks" button that allows the user to
+            // continue using your app without granting the permission.
+        }
+        else -> {
+            // You can directly ask for the permission.
+            requestPermissions(arrayOf(PERMISSION), PERMISSION_REQUEST_CODE)
+        }
+    }
+
+    override fun onRequestPermissionsResult(
+        requestCode: Int,
+        permissions: Array<String>,
+        grantResults: IntArray
+    ) {
+        if (requestCode == PERMISSION_REQUEST_CODE && grantResults.isNotEmpty() &&
+            grantResults[0] == PERMISSION_GRANTED
+        ) checkPerm()
+    }
+
+    @SuppressLint("HardwareIds")
+    @RequiresPermission(PERMISSION)
+    private fun fillPhoneNumber() {
+        val telephonyService = requireContext().getSystemService(TelephonyManager::class.java)
+        telephonyService?.line1Number?.let { phoneNumber ->
+            smsView?.editText?.setText(phoneNumber)
+            smsView?.editText?.setSelection(phoneNumber.length)
+        }
+    }
+
 }
-- 
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