--- /dev/null
+/*
+ * Copyright © 2019 Soren Stoutner <soren@stoutner.com>.
+ *
+ * This file is part of Privacy Browser <https://www.stoutner.com/privacy-browser>.
+ *
+ * Privacy Browser 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 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. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.stoutner.privacybrowser.asynctasks;
+
+import android.app.Activity;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.os.AsyncTask;
+
+import com.google.android.material.snackbar.Snackbar;
+
+import com.stoutner.privacybrowser.R;
+import com.stoutner.privacybrowser.views.NestedScrollWebView;
+import com.stoutner.privacybrowser.views.NoSwipeViewPager;
+
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.lang.ref.WeakReference;
+
+public class SaveWebpageImage extends AsyncTask<String, Void, String> {
+ // Define the weak references.
+ private WeakReference<Activity> activityWeakReference;
+ private WeakReference<NestedScrollWebView> nestedScrollWebViewWeakReference;
+
+ // Define a success string constant.
+ private final String SUCCESS = "Success";
+
+ // Define the saving image snackbar and the webpage bitmap.
+ private Snackbar savingImageSnackbar;
+ private Bitmap webpageBitmap;
+
+ // The public constructor.
+ public SaveWebpageImage(Activity activity, NestedScrollWebView nestedScrollWebView) {
+ // Populate the weak references.
+ activityWeakReference = new WeakReference<>(activity);
+ nestedScrollWebViewWeakReference = new WeakReference<>(nestedScrollWebView);
+ }
+
+ // `onPreExecute()` operates on the UI thread.
+ @Override
+ protected void onPreExecute() {
+ // Get a handle for the activity and the nested scroll WebView.
+ Activity activity = activityWeakReference.get();
+ NestedScrollWebView nestedScrollWebView = nestedScrollWebViewWeakReference.get();
+
+ // Abort if the activity or the nested scroll WebView is gone.
+ if ((activity == null) || activity.isFinishing() || nestedScrollWebView == null) {
+ return;
+ }
+
+ // Create a saving image snackbar.
+ savingImageSnackbar = Snackbar.make(nestedScrollWebView, R.string.saving_image, Snackbar.LENGTH_INDEFINITE);
+
+ // Display the saving image snackbar.
+ savingImageSnackbar.show();
+
+ // Create a webpage bitmap. Once the Minimum API >= 26 Bitmap.Config.RBGA_F16 can be used instead of ARGB_8888. The nested scroll WebView commands must be run on the UI thread.
+ webpageBitmap = Bitmap.createBitmap(nestedScrollWebView.getHorizontalScrollRange(), nestedScrollWebView.getVerticalScrollRange(), Bitmap.Config.ARGB_8888);
+
+ // Create a canvas.
+ Canvas webpageCanvas = new Canvas(webpageBitmap);
+
+ // Draw the current webpage onto the bitmap. The nested scroll WebView commands must be run on the UI thread.
+ nestedScrollWebView.draw(webpageCanvas);
+ }
+
+ @Override
+ protected String doInBackground(String... fileName) {
+ // Get a handle for the activity.
+ Activity activity = activityWeakReference.get();
+
+ // Abort if the activity is gone.
+ if ((activity == null) || activity.isFinishing()) {
+ return "";
+ }
+
+ // Create a webpage PNG byte array output stream.
+ ByteArrayOutputStream webpageByteArrayOutputStream = new ByteArrayOutputStream();
+
+ // Convert the bitmap to a PNG. `0` is for lossless compression (the only option for a PNG). This compression takes a long time.
+ webpageBitmap.compress(Bitmap.CompressFormat.PNG, 0, webpageByteArrayOutputStream);
+
+ // Get a file for the image.
+ File imageFile = new File(fileName[0]);
+
+ // Delete the current file if it exists.
+ if (imageFile.exists()) {
+ //noinspection ResultOfMethodCallIgnored
+ imageFile.delete();
+ }
+
+ // Create a file creation disposition string.
+ String fileCreationDisposition = SUCCESS;
+
+ try {
+ // Create an image file output stream.
+ FileOutputStream imageFileOutputStream = new FileOutputStream(imageFile);
+
+ // Write the webpage image to the image file.
+ webpageByteArrayOutputStream.writeTo(imageFileOutputStream);
+ } catch (Exception exception) {
+ // Store the error in the file creation disposition string.
+ fileCreationDisposition = exception.toString();
+ }
+
+ // Return the file creation disposition string.
+ return fileCreationDisposition;
+ }
+
+ // `onPostExecute()` operates on the UI thread.
+ @Override
+ protected void onPostExecute(String fileCreationDisposition) {
+ // Get a handle for the activity.
+ Activity activity = activityWeakReference.get();
+
+ // Abort if the activity is gone.
+ if ((activity == null) || activity.isFinishing()) {
+ return;
+ }
+
+ // Get a handle for the no swipe view pager.
+ NoSwipeViewPager noSwipeViewPager = activity.findViewById(R.id.webviewpager);
+
+ // Dismiss the saving image snackbar.
+ savingImageSnackbar.dismiss();
+
+ // Display a file creation disposition snackbar.
+ if (fileCreationDisposition.equals(SUCCESS)) {
+ Snackbar.make(noSwipeViewPager, R.string.image_saved, Snackbar.LENGTH_SHORT).show();
+ } else {
+ Snackbar.make(noSwipeViewPager, activity.getString(R.string.error_saving_image) + " " + fileCreationDisposition, Snackbar.LENGTH_INDEFINITE).show();
+ }
+ }
+}
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projects / PrivacyBrowserAndroid.git / blobdiff