Merge pull request #12461 from blakbin/DocumentProvider

Improve DocumentProvider

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/DocumentProvider.kt

@@ -9,8 +9,11 @@
 package org.dolphinemu.dolphinemu.features
 
 import android.annotation.TargetApi
+import android.content.res.AssetFileDescriptor
 import android.database.Cursor
 import android.database.MatrixCursor
+import android.graphics.Point
+import android.net.Uri
 import android.os.Build
 import android.os.CancellationSignal
 import android.os.ParcelFileDescriptor
@@ -27,7 +30,7 @@ class DocumentProvider : DocumentsProvider() {
     private var rootDirectory: File? = null
 
     companion object {
-        public const val ROOT_ID = "root"
+        const val ROOT_ID = "root"
 
         private val DEFAULT_ROOT_PROJECTION = arrayOf(
             DocumentsContract.Root.COLUMN_ROOT_ID,
@@ -93,6 +96,8 @@ class DocumentProvider : DocumentsProvider() {
                 appendDocument(file, result)
             }
         }
+        result.setNotificationUri(context!!.contentResolver, DocumentsContract.buildChildDocumentsUri(
+                "${context!!.packageName}.user", parentDocumentId))
         return result
     }
 
@@ -107,6 +112,16 @@ class DocumentProvider : DocumentsProvider() {
         return ParcelFileDescriptor.open(file, ParcelFileDescriptor.parseMode(mode))
     }
 
+    override fun openDocumentThumbnail(
+            documentId: String,
+            sizeHint: Point,
+            signal: CancellationSignal
+    ): AssetFileDescriptor {
+        val file = documentIdToPath(documentId)
+        val pfd = ParcelFileDescriptor.open(file, ParcelFileDescriptor.MODE_READ_ONLY)
+        return AssetFileDescriptor(pfd, 0, AssetFileDescriptor.UNKNOWN_LENGTH)
+    }
+
     override fun createDocument(
         parentDocumentId: String,
         mimeType: String,
@@ -121,6 +136,7 @@ class DocumentProvider : DocumentsProvider() {
         } else {
             file.createNewFile()
         }
+        refreshDocument(parentDocumentId)
         return pathToDocumentId(file)
     }
 
@@ -128,7 +144,9 @@ class DocumentProvider : DocumentsProvider() {
         rootDirectory ?: return
 
         val file = documentIdToPath(documentId)
+        val fileParent = file.parentFile
         file.deleteRecursively()
+        refreshDocument(pathToDocumentId(fileParent!!))
     }
 
     override fun renameDocument(documentId: String, displayName: String): String? {
@@ -137,9 +155,19 @@ class DocumentProvider : DocumentsProvider() {
         val file = documentIdToPath(documentId)
         val dest = findFileNameForNewFile(File(file.parentFile, displayName))
         file.renameTo(dest)
+        refreshDocument(pathToDocumentId(file.parentFile!!))
         return pathToDocumentId(dest)
     }
 
+    private fun refreshDocument(parentDocumentId: String) {
+        val parentUri: Uri =
+                DocumentsContract.buildChildDocumentsUri(
+                        "${context!!.packageName}.user",
+                        parentDocumentId
+                )
+        context!!.contentResolver.notifyChange(parentUri, null)
+    }
+
     override fun isChildDocument(parentDocumentId: String, documentId: String): Boolean
         = documentId.startsWith(parentDocumentId)
 
@@ -161,6 +189,10 @@ class DocumentProvider : DocumentsProvider() {
         } else {
             file.name
         }
+        val mimeType = getTypeForFile(file)
+        if (file.exists() && mimeType.startsWith("image/")) {
+            flags = flags or DocumentsContract.Document.FLAG_SUPPORTS_THUMBNAIL
+        }
         cursor.newRow().apply {
             add(DocumentsContract.Document.COLUMN_DOCUMENT_ID, pathToDocumentId(file))
             add(DocumentsContract.Document.COLUMN_MIME_TYPE, getTypeForFile(file))