Handle EACCESS in BackupModule

android/app/src/main/AndroidManifest.xml

@@ -20,6 +20,7 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
+        android:requestLegacyExternalStorage="true"
         android:theme="@style/AppTheme">
         <activity
             android:name=".TimerDone"
@@ -44,6 +45,7 @@
             android:name=".StopAlarm"
             android:exported="true"
             android:process=":remote" />
+
         <service
             android:name=".AlarmService"
             android:exported="false" />

android/app/src/main/java/com/massive/BackupModule.kt

@@ -1,23 +1,27 @@
 package com.massive
 
+import android.Manifest
 import android.app.AlarmManager
 import android.app.PendingIntent
 import android.content.BroadcastReceiver
 import android.content.Context
 import android.content.Intent
 import android.content.IntentFilter
+import android.content.pm.PackageManager
 import android.os.Build
 import android.os.Environment
-import android.util.Log
 import androidx.annotation.RequiresApi
+import androidx.core.app.ActivityCompat
 import com.facebook.react.bridge.ReactApplicationContext
 import com.facebook.react.bridge.ReactContextBaseJavaModule
 import com.facebook.react.bridge.ReactMethod
 import java.io.File
 import java.io.FileInputStream
 import java.io.FileOutputStream
+import java.io.IOException
 import java.util.*
 
+
 class BackupModule constructor(context: ReactApplicationContext?) :
     ReactContextBaseJavaModule(context) {
     val context: ReactApplicationContext = reactApplicationContext
@@ -25,25 +29,51 @@ class BackupModule constructor(context: ReactApplicationContext?) :
     private val copyReceiver = object : BroadcastReceiver() {
         @RequiresApi(Build.VERSION_CODES.O)
         override fun onReceive(context: Context?, intent: Intent?) {
-            Log.d("BackupModule", "Backing up database...")
             val sourceFile = File(context?.getDatabasePath("massive.db")!!.path)
-
             val targetDir =
                 Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
-            val targetFile = File(targetDir, "massive.db")
+            var targetFile = File(targetDir, "massive.db")
+            var count = 0
 
-            val input = FileInputStream(sourceFile)
-            val output = FileOutputStream(targetFile)
-
-            input.copyTo(output)
-            input.close()
-            output.close()
+            try {
+                val input = FileInputStream(sourceFile)
+                val output = FileOutputStream(targetFile)
+                input.copyTo(output)
+                input.close()
+                output.close()
+            } catch (e: IOException) {
+                while (targetFile.exists()) {
+                    count++
+                    targetFile = File(targetDir, "massive (${count}).db")
+                }
+                val input = FileInputStream(sourceFile)
+                val output = FileOutputStream(targetFile)
+                input.copyTo(output)
+                input.close()
+                output.close()
+            }
         }
     }
 
     @RequiresApi(Build.VERSION_CODES.M)
     @ReactMethod
     fun start() {
+        val permission: Int =
+            ActivityCompat.checkSelfPermission(
+                reactApplicationContext,
+                Manifest.permission.WRITE_EXTERNAL_STORAGE
+            )
+        if (permission != PackageManager.PERMISSION_GRANTED) {
+            ActivityCompat.requestPermissions(
+                currentActivity!!,
+                arrayOf<String>(
+                    Manifest.permission.READ_EXTERNAL_STORAGE,
+                    Manifest.permission.WRITE_EXTERNAL_STORAGE
+                ),
+                1
+            )
+        }
+
         val alarmMgr = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
         val intent = Intent(COPY_BROADCAST)
         val pendingIntent =