--- /dev/null
+/*
+ * Copyright 2020-2022 Soren Stoutner <soren@stoutner.com>.
+ *
+ * This file is part of Privacy Browser Android <https://www.stoutner.com/privacy-browser-android>.
+ *
+ * Privacy Browser Android is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Privacy Browser Android is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Privacy Browser Android. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.stoutner.privacybrowser.coroutines
+
+import android.app.Activity
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.net.Uri
+import android.os.Build
+import android.provider.OpenableColumns
+import android.widget.LinearLayout
+
+import com.google.android.material.snackbar.Snackbar
+
+import com.stoutner.privacybrowser.R
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+import java.io.ByteArrayOutputStream
+import java.lang.Exception
+
+// Declare the class constants.
+private const val SUCCESS = "Success"
+
+object SaveAboutVersionImageCoroutine {
+ fun saveImage(activity: Activity, fileUri: Uri, aboutVersionLinearLayout: LinearLayout) {
+ // Save the image using a coroutine.
+ CoroutineScope(Dispatchers.Main).launch {
+ // Create a saving image snackbar.
+ val savingImageSnackbar: Snackbar
+
+ // Process the image on the IO thread.
+ withContext(Dispatchers.IO) {
+ // Instantiate a file name string.
+ val fileNameString: String
+
+ // Query the exact file name if the API >= 26.
+ if (Build.VERSION.SDK_INT >= 26) { // The API >= 26.
+ // Get a cursor from the content resolver.
+ val contentResolverCursor = activity.contentResolver.query(fileUri, null, null, null)
+
+ // Get the file display name if the content resolve cursor is not null.
+ if (contentResolverCursor != null) { // The content resolve cursor is not null.
+ // Move to the first row.
+ contentResolverCursor.moveToFirst()
+
+ // Get the file name from the cursor.
+ fileNameString = contentResolverCursor.getString(contentResolverCursor.getColumnIndexOrThrow(OpenableColumns.DISPLAY_NAME))
+
+ // Close the cursor.
+ contentResolverCursor.close()
+ } else { // The content resolve cursor is null.
+ // Use the URI last path segment as the file name string.
+ fileNameString = fileUri.lastPathSegment.toString()
+ }
+ } else { // The API is < 26.
+ // Use the URI last path segment as the file name string.
+ fileNameString = fileUri.lastPathSegment.toString()
+ }
+
+ // Use the main thread to display a snackbar.
+ withContext(Dispatchers.Main) {
+ // Create a saving image snackbar.
+ savingImageSnackbar = Snackbar.make(aboutVersionLinearLayout, activity.getString(R.string.processing_image, fileNameString), Snackbar.LENGTH_INDEFINITE)
+
+ // Display the saving image snackbar.
+ savingImageSnackbar.show()
+ }
+
+ // Create the about version bitmap. This can be replaced by PixelCopy once the minimum API >= 26.
+ // Once the Minimum API >= 26 Bitmap.Config.RBGA_F16 can be used instead of ARGB_8888. The linear layout commands must be run on the UI thread.
+ val aboutVersionBitmap = Bitmap.createBitmap(aboutVersionLinearLayout.width, aboutVersionLinearLayout.height, Bitmap.Config.ARGB_8888)
+
+ // Create a canvas.
+ val aboutVersionCanvas = Canvas(aboutVersionBitmap)
+
+ // Use the main thread to interact with the linear layout.
+ withContext(Dispatchers.Main) {
+ // Draw the current about version onto the bitmap.
+ aboutVersionLinearLayout.draw(aboutVersionCanvas)
+ }
+
+ // Create an about version PNG byte array output stream.
+ val aboutVersionByteArrayOutputStream = ByteArrayOutputStream()
+
+ // Convert the bitmap to a PNG. `0` is for lossless compression (the only option for a PNG). This compression takes a long time.
+ // Once the minimum API >= 30 this could be replaced with WEBP_LOSSLESS.
+ aboutVersionBitmap.compress(Bitmap.CompressFormat.PNG, 0, aboutVersionByteArrayOutputStream)
+
+ // Create a file creation disposition string.
+ var fileCreationDisposition = SUCCESS
+
+ // Write the image inside a try block to capture any write exceptions.
+ try {
+ // Open an output stream.
+ val outputStream = activity.contentResolver.openOutputStream(fileUri)!!
+
+ // Write the webpage image to the image file.
+ aboutVersionByteArrayOutputStream.writeTo(outputStream)
+
+ // Close the output stream.
+ outputStream.close()
+ } catch (exception: Exception) {
+ // Store the error in the file creation disposition string.
+ fileCreationDisposition = exception.toString()
+ }
+
+ // Use the main thread to update the snackbars.
+ withContext(Dispatchers.Main) {
+ // Dismiss the saving image snackbar.
+ savingImageSnackbar.dismiss()
+
+ // Display a file creation disposition snackbar.
+ if (fileCreationDisposition == SUCCESS) {
+ // Create a file saved snackbar.
+ Snackbar.make(aboutVersionLinearLayout, activity.getString(R.string.saved, fileNameString), Snackbar.LENGTH_SHORT).show()
+ } else {
+ Snackbar.make(aboutVersionLinearLayout, activity.getString(R.string.error_saving_file, fileNameString, fileCreationDisposition), Snackbar.LENGTH_INDEFINITE).show()
+ }
+ }
+ }
+ }
+ }
+}
projects / PrivacyBrowserAndroid.git / blobdiff