Remove reliance on WRITE_EXTERNAL_STORAGE

https://developer.android.com/about/versions/11/privacy/storage#permissions-target-11

SettingsPage.tsx

@@ -478,7 +478,7 @@ export default function SettingsPage() {
       ),
     },
     {
-      name: `Backup directory: ${backupString || "Downloads"}`,
+      name: `Backup directory: ${backupString || "Not set yet!"}`,
       renderItem: (name: string) => (
         <Button
           style={{ alignSelf: "flex-start" }}
@@ -522,15 +522,15 @@ export default function SettingsPage() {
         <Button
           style={{ alignSelf: "flex-start" }}
           onPress={async () => {
-            const result = await check(
-              PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE
-            );
-            if (result === RESULTS.DENIED || result === RESULTS.BLOCKED) {
-              await request(PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE);
+            let target = settings.backupDir
+            if (!FileSystem.exists(target)) {
+              const result = await DocumentPicker.pickDirectory();
+              target = result.uri
+              setValue("backupDir", result.uri);
             }
-            const path = Dirs.DatabaseDir + "/massive.db";
-            await FileSystem.cpExternal(path, "massive.db", "downloads");
-            toast("Database exported. Check downloads.");
+            const error = await NativeModules.BackupModule.once(target);
+            if (error) toast(error);
+            else toast("Database exported.");
           }}
         >
           {name}
@@ -543,13 +543,13 @@ export default function SettingsPage() {
         <Button
           style={{ alignSelf: "flex-start" }}
           onPress={async () => {
-            const result = await check(
-              PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE
-            );
-            if (result === RESULTS.DENIED || result === RESULTS.BLOCKED) {
-              await request(PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE);
+            let target = settings.backupDir
+            if (!target || !FileSystem.exists(target)) {
+              const result = await DocumentPicker.pickDirectory();
+              target = result.uri
+              setValue("backupDir", result.uri);
             }
-            await NativeModules.BackupModule.exportToCSV();
+            await NativeModules.BackupModule.exportToCSV(target);
             toast("Exported sets as CSV.");
           }}
         >

android/app/src/main/AndroidManifest.xml

@@ -4,7 +4,6 @@
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <uses-permission android:name="android.permission.VIBRATE" />
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS" />
     <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" />
     <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

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

@@ -7,7 +7,6 @@ import android.content.*
 import android.net.Uri
 import android.os.Build
 import android.util.Log
-import androidx.annotation.RequiresApi
 import androidx.documentfile.provider.DocumentFile
 import com.facebook.react.bridge.Promise
 import com.facebook.react.bridge.ReactApplicationContext
@@ -22,7 +21,6 @@ class BackupModule(context: ReactApplicationContext?) :
     val context: ReactApplicationContext = reactApplicationContext
 
     private val copyReceiver = object : BroadcastReceiver() {
-        @RequiresApi(Build.VERSION_CODES.O)
         override fun onReceive(context: Context?, intent: Intent?) {
             val targetDir = intent?.getStringExtra("targetDir")
             Log.d("BackupModule", "onReceive $targetDir")
@@ -40,7 +38,28 @@ class BackupModule(context: ReactApplicationContext?) :
         }
     }
 
-    @RequiresApi(Build.VERSION_CODES.M)
+    @ReactMethod
+    fun once(target: String, promise: Promise) {
+        Log.d("BackupModule", "once $target")
+        try {
+            val treeUri: Uri = Uri.parse(target)
+            val documentFile = context.let { DocumentFile.fromTreeUri(it, treeUri) }
+            val file = documentFile?.createFile("application/octet-stream", "massive.db")
+            val output = context.contentResolver?.openOutputStream(file!!.uri)
+            val sourceFile = File(context.getDatabasePath("massive.db")!!.path)
+            val input = FileInputStream(sourceFile)
+            if (output != null) {
+                input.copyTo(output)
+            }
+            output?.flush()
+            output?.close()
+            promise.resolve(0)
+        }
+        catch (error: Exception) {
+            promise.reject("ERROR", error)
+        }
+    }
+
     @ReactMethod
     fun start(baseUri: String) {
         Log.d("BackupModule", "start $baseUri")
@@ -66,7 +85,6 @@ class BackupModule(context: ReactApplicationContext?) :
         )
     }
 
-    @RequiresApi(Build.VERSION_CODES.M)
     @ReactMethod(isBlockingSynchronousMethod = true)
     fun stop() {
         val alarmMgr = context.getSystemService(Context.ALARM_SERVICE) as AlarmManager
@@ -77,10 +95,10 @@ class BackupModule(context: ReactApplicationContext?) :
     }
 
     @ReactMethod
-    fun exportToCSV(promise: Promise) {
+    fun exportToCSV(target: String, promise: Promise) {
         try {
             val db = DatabaseHelper(reactApplicationContext)
-            db.exportToCSV()
+            db.exportToCSV(target, reactApplicationContext)
             promise.resolve("Export successful!")
         }
         catch (e: Exception) {

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

@@ -3,7 +3,10 @@ package com.massive
 import android.content.Context
 import android.database.sqlite.SQLiteDatabase
 import android.database.sqlite.SQLiteOpenHelper
+import android.net.Uri
 import android.os.Environment
+import android.util.Log
+import androidx.documentfile.provider.DocumentFile
 import com.opencsv.CSVWriter
 import java.io.File
 import java.io.FileWriter
@@ -15,30 +18,29 @@ class DatabaseHelper(context: Context) :
         private const val DATABASE_VERSION = 1
     }
 
-    fun exportToCSV() {
-        val exportDir = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)
-        if (!exportDir.exists()) {
-            exportDir.mkdirs()
-        }
+    fun exportToCSV(target: String, context: Context) {
+        Log.d("DatabaseHelper", "exportToCSV $target")
+        val treeUri: Uri = Uri.parse(target)
+        val documentFile = context.let { DocumentFile.fromTreeUri(it, treeUri) }
+        val file = documentFile?.createFile("application/octet-stream", "sets.csv") ?: return
 
-        val file = File(exportDir, "gym_sets.csv")
-        file.createNewFile()
+        context.contentResolver.openOutputStream(file.uri).use { outputStream ->
+            val csvWrite = CSVWriter(outputStream?.writer())
+            val db = this.readableDatabase
+            val cursor = db.rawQuery("SELECT * FROM sets", null)
+            csvWrite.writeNext(cursor.columnNames)
 
-        val csvWrite = CSVWriter(FileWriter(file))
-        val db = this.readableDatabase
-        val cursor = db.rawQuery("SELECT * FROM sets", null)
-        csvWrite.writeNext(cursor.columnNames)
-
-        while(cursor.moveToNext()) {
-            val arrStr = arrayOfNulls<String>(cursor.columnCount)
-            for(i in 0 until cursor.columnCount) {
-                arrStr[i] = cursor.getString(i)
+            while(cursor.moveToNext()) {
+                val arrStr = arrayOfNulls<String>(cursor.columnCount)
+                for(i in 0 until cursor.columnCount) {
+                    arrStr[i] = cursor.getString(i)
+                }
+                csvWrite.writeNext(arrStr)
             }
-            csvWrite.writeNext(arrStr)
-        }
 
-        csvWrite.close()
-        cursor.close()
+            csvWrite.close()
+            cursor.close()
+        }
     }
 
     override fun onCreate(db: SQLiteDatabase) {