Add share option when a long press on an image in the item activity is detected

app/src/main/AndroidManifest.xml

@@ -19,6 +19,17 @@
         android:usesCleartextTraffic="true"
         android:requestLegacyExternalStorage="true"
         tools:ignore="AllowBackup,GoogleAppIndexingWarning,UnusedAttribute">
+
+        <provider
+            android:authorities="${applicationId}"
+            android:name="androidx.core.content.FileProvider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
+
         <activity
             android:name=".activities.WebViewActivity"
             android:theme="@style/AppTheme.NoActionBar" />

app/src/main/java/com/readrops/app/activities/ItemActivity.java

@@ -3,20 +3,31 @@ package com.readrops.app.activities;
 import android.content.Intent;
 import android.content.res.ColorStateList;
 import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Bundle;
+import android.util.Log;
+import android.view.ContextMenu;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
+import android.webkit.WebView;
 import android.widget.ImageView;
 import android.widget.RelativeLayout;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
+import androidx.core.app.ShareCompat;
 import androidx.lifecycle.ViewModelProvider;
 
+import com.afollestad.materialdialogs.MaterialDialog;
 import com.bumptech.glide.load.engine.DiskCacheStrategy;
+import com.bumptech.glide.request.target.CustomTarget;
+import com.bumptech.glide.request.transition.Transition;
 import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.appbar.CollapsingToolbarLayout;
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
@@ -37,6 +48,8 @@ import static com.readrops.app.utils.ReadropsKeys.WEB_URL;
 
 public class ItemActivity extends AppCompatActivity {
 
+    private static final String TAG = ItemActivity.class.getSimpleName();
+
     private ItemViewModel viewModel;
     private TextView date;
     private TextView title;
@@ -84,6 +97,8 @@ public class ItemActivity extends AppCompatActivity {
         readTimeLayout = findViewById(R.id.activity_item_readtime_layout);
         dateLayout = findViewById(R.id.activity_item_date_layout);
 
+        registerForContextMenu(webView);
+
         if (imageUrl == null) {
             getSupportActionBar().setDisplayShowTitleEnabled(false);
             toolbarLayout.setTitleEnabled(false);
@@ -246,4 +261,58 @@ public class ItemActivity extends AppCompatActivity {
         shareIntent.putExtra(Intent.EXTRA_TEXT, itemWithFeed.getItem().getTitle() + " - " + itemWithFeed.getItem().getLink());
         startActivity(Intent.createChooser(shareIntent, getString(R.string.share_article)));
     }
+
+    @Override
+    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
+        WebView.HitTestResult hitTestResult = webView.getHitTestResult();
+
+        if (hitTestResult.getType() == WebView.HitTestResult.IMAGE_TYPE ||
+                hitTestResult.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
+            new MaterialDialog.Builder(this)
+                    .title(R.string.image_options)
+                    .items(R.array.image_options)
+                    .itemsCallback((dialog, itemView, position, text) -> {
+                        if (position == 0)
+                            shareImage(hitTestResult.getExtra());
+                        else
+                            downloadImage(hitTestResult.getExtra());
+                    })
+                    .show();
+        }
+    }
+
+    private void downloadImage(String url) {
+
+    }
+
+    private void shareImage(String url) {
+        GlideApp.with(this)
+                .asBitmap()
+                .diskCacheStrategy(DiskCacheStrategy.ALL)
+                .load(url)
+                .into(new CustomTarget<Bitmap>() {
+                    @Override
+                    public void onResourceReady(@NonNull Bitmap resource, @Nullable Transition<? super Bitmap> transition) {
+                        try {
+                            Uri uri = viewModel.saveImageInCache(resource);
+                            Intent intent = ShareCompat.IntentBuilder.from(ItemActivity.this)
+                                    .setType("image/png")
+                                    .setStream(uri)
+                                    .setChooserTitle(R.string.share_image)
+                                    .createChooserIntent()
+                                    .addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
+
+                            startActivity(intent);
+                        } catch (Exception e) {
+                            Log.e(TAG, e.getMessage());
+                        }
+                    }
+
+                    @Override
+                    public void onLoadCleared(@Nullable Drawable placeholder) {
+                        // not useful
+                    }
+                });
+
+    }
 }

app/src/main/java/com/readrops/app/viewmodels/ItemViewModel.java

@@ -1,14 +1,23 @@
 package com.readrops.app.viewmodels;
 
 import android.app.Application;
+import android.graphics.Bitmap;
+import android.net.Uri;
+
+import androidx.annotation.NonNull;
+import androidx.core.content.FileProvider;
 import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
-import androidx.annotation.NonNull;
 
 import com.readrops.app.database.Database;
 import com.readrops.app.database.dao.ItemDao;
 import com.readrops.app.database.pojo.ItemWithFeed;
 
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
 public class ItemViewModel extends AndroidViewModel {
 
     private ItemDao itemDao;
@@ -23,4 +32,19 @@ public class ItemViewModel extends AndroidViewModel {
     }
 
 
+    public Uri saveImageInCache(Bitmap bitmap) throws IOException {
+        File imagesFolder = new File(getApplication().getCacheDir().getAbsolutePath(), "images");
+
+        if (!imagesFolder.exists())
+            imagesFolder.mkdirs();
+
+        File image = new File(imagesFolder, "shared_image.png");
+        OutputStream stream = new FileOutputStream(image);
+        bitmap.compress(Bitmap.CompressFormat.PNG, 90, stream);
+
+        stream.flush();
+        stream.close();
+
+        return FileProvider.getUriForFile(getApplication(), getApplication().getPackageName(), image);
+    }
 }

app/src/main/res/values-fr-rFR/strings.xml

@@ -103,5 +103,8 @@
     <string name="try_again">Réessayer</string>
     <string name="permissions">Permissions</string>
     <string name="or">Ou</string>
+    <string name="image_options">Options de l\'image</string>
+    <string name="download_image">Télécharger l\'image</string>
+    <string name="share_image">Partager l\'image</string>
 
 </resources>

app/src/main/res/values/arrays.xml

@@ -10,6 +10,11 @@
         <item>@string/opml_export</item>
     </string-array>
 
+    <string-array name="image_options">
+        <item>@string/share_image</item>
+        <item>@string/download_image</item>
+    </string-array>
+
     <string-array name="items_per_feed_numbers_values">
         <item>20</item>
         <item>50</item>

app/src/main/res/values/strings.xml

@@ -112,4 +112,7 @@
     <string name="try_again">Try again</string>
     <string name="permissions">Permissions</string>
     <string name="or">Or</string>
+    <string name="image_options">Image Options</string>
+    <string name="download_image">Download image</string>
+    <string name="share_image">Share image</string>
 </resources>

app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <paths>
+        <cache-path
+            name="shared_images"
+            path="images/" />
+    </paths>
+</resources>