handle kitkat permissions at saving edited photos

app/src/main/java/com/simplemobiletools/gallery/Utils.kt

@@ -1,6 +1,7 @@
 package com.simplemobiletools.gallery
 
 import android.Manifest
+import android.annotation.TargetApi
 import android.app.Activity
 import android.content.Context
 import android.content.Intent
@@ -125,7 +126,7 @@ class Utils {
                     View.SYSTEM_UI_FLAG_IMMERSIVE
         }
 
-        fun getRealPathFromURI(context: Context, uri: Uri): String {
+        fun getRealPathFromURI(context: Context, uri: Uri): String? {
             var cursor: Cursor? = null
             try {
                 val projection = arrayOf(MediaStore.Images.Media.DATA)
@@ -157,5 +158,14 @@ class Utils {
             }
             return document
         }
+
+        @TargetApi(Build.VERSION_CODES.KITKAT)
+        fun saveTreeUri(context: Context, resultData: Intent) {
+            val treeUri = resultData.data
+            Config.newInstance(context).treeUri = treeUri.toString()
+
+            val takeFlags = Intent.FLAG_GRANT_READ_URI_PERMISSION or Intent.FLAG_GRANT_WRITE_URI_PERMISSION
+            context.contentResolver.takePersistableUriPermission(treeUri, takeFlags)
+        }
     }
 }

app/src/main/kotlin/com/simplemobiletools/gallery/activities/EditActivity.kt

@@ -1,6 +1,7 @@
 package com.simplemobiletools.gallery.activities
 
 import android.app.Activity
+import android.content.Intent
 import android.graphics.Bitmap
 import android.media.MediaScannerConnection
 import android.net.Uri
@@ -8,14 +9,18 @@ import android.os.Bundle
 import android.util.Log
 import android.view.Menu
 import android.view.MenuItem
+import com.simplemobiletools.gallery.Config
+import com.simplemobiletools.gallery.Constants
 import com.simplemobiletools.gallery.R
 import com.simplemobiletools.gallery.Utils
+import com.simplemobiletools.gallery.dialogs.WritePermissionDialog
 import com.simplemobiletools.gallery.extensions.toast
 import com.theartofdev.edmodo.cropper.CropImageView
 import kotlinx.android.synthetic.main.activity_edit.*
 import java.io.File
 import java.io.FileOutputStream
 import java.io.IOException
+import java.io.OutputStream
 
 class EditActivity : SimpleActivity(), CropImageView.OnCropImageCompleteListener {
     val TAG: String = EditActivity::class.java.simpleName
@@ -93,9 +98,25 @@ class EditActivity : SimpleActivity(), CropImageView.OnCropImageCompleteListener
             return
         }
 
-        var out: FileOutputStream? = null
+        var out: OutputStream? = null
         try {
-            out = FileOutputStream(file)
+            if (Utils.needsStupidWritePermissions(this, path)) {
+                if (!file.canWrite() && Config.newInstance(this).treeUri.isEmpty()) {
+                    WritePermissionDialog(this, object : WritePermissionDialog.OnWritePermissionListener {
+                        override fun onConfirmed() {
+                            val intent = Intent(Intent.ACTION_OPEN_DOCUMENT_TREE)
+                            startActivityForResult(intent, Constants.OPEN_DOCUMENT_TREE)
+                        }
+                    })
+                    return
+                }
+
+                val document = Utils.getFileDocument(this, path)
+                out = contentResolver.openOutputStream(document.uri)
+            } else {
+                out = FileOutputStream(file)
+            }
+
             bitmap.compress(getCompressionFormat(file), 90, out)
             setResult(Activity.RESULT_OK, intent)
         } catch (e: Exception) {
@@ -116,6 +137,13 @@ class EditActivity : SimpleActivity(), CropImageView.OnCropImageCompleteListener
         })
     }
 
+    override fun onActivityResult(requestCode: Int, resultCode: Int, resultData: Intent?) {
+        super.onActivityResult(requestCode, resultCode, resultData)
+        if (requestCode == Constants.OPEN_DOCUMENT_TREE && resultCode == Activity.RESULT_OK && resultData != null) {
+            Utils.saveTreeUri(this, resultData)
+        }
+    }
+
     private fun getCompressionFormat(file: File): Bitmap.CompressFormat {
         return when (file.extension.toLowerCase()) {
             "png" -> Bitmap.CompressFormat.PNG