X-Git-Url: https://gitweb.stoutner.com/?p=PrivacyBrowserAndroid.git;a=blobdiff_plain;f=app%2Fsrc%2Fmain%2Fjava%2Fcom%2Fstoutner%2Fprivacybrowser%2Fasynctasks%2FSaveWebpageImage.java;fp=app%2Fsrc%2Fmain%2Fjava%2Fcom%2Fstoutner%2Fprivacybrowser%2Fasynctasks%2FSaveWebpageImage.java;h=aeb92988e93f52aedfe2b573cc15d77c3922ace6;hp=0000000000000000000000000000000000000000;hb=c1c9a0bf83ecef671356d554bb6e4927392b1cc8;hpb=877ee4a6ba4d034bbd9843e037f6c70635c0a5b0

diff --git a/app/src/main/java/com/stoutner/privacybrowser/asynctasks/SaveWebpageImage.java b/app/src/main/java/com/stoutner/privacybrowser/asynctasks/SaveWebpageImage.java
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+++ b/app/src/main/java/com/stoutner/privacybrowser/asynctasks/SaveWebpageImage.java
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+/*
+ * 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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