Added Favourites section

app/build.gradle

@@ -48,6 +48,7 @@ dependencies {
     implementation 'com.android.support:recyclerview-v7:28.0.0'
     implementation 'com.android.support:cardview-v7:28.0.0'
     implementation 'com.android.support:support-v4:28.0.0'
+    implementation 'com.android.support:preference-v7:28.0.0'
 
     // butterknife
     implementation 'com.jakewharton:butterknife:8.8.1'

app/src/main/AndroidManifest.xml

@@ -72,6 +72,7 @@
         <activity android:name=".activity.RearrangeImages" />
         <activity android:name=".activity.ImagesPreviewActivity" />
         <activity android:name=".activity.RearrangePdfPages" />
+        <activity android:name=".activity.FavouritesActivity"/>
 
     </application>
 

app/src/main/java/swati4star/createpdf/activity/FavouritesActivity.java

@@ -0,0 +1,16 @@
+package swati4star.createpdf.activity;
+
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.v7.app.AppCompatActivity;
+
+import swati4star.createpdf.R;
+
+public class FavouritesActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.fav_pref_screen);
+    }
+}

app/src/main/java/swati4star/createpdf/activity/MainActivity.java

@@ -15,9 +15,12 @@
 import android.support.v4.content.ContextCompat;
 import android.support.v4.view.GravityCompat;
 import android.support.v4.widget.DrawerLayout;
+import android.support.v7.app.ActionBar;
 import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.widget.Toolbar;
+import android.view.Menu;
+import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.widget.Toast;
 
@@ -28,6 +31,7 @@
 import swati4star.createpdf.R;
 import swati4star.createpdf.fragment.AboutUsFragment;
 import swati4star.createpdf.fragment.AddImagesFragment;
+import swati4star.createpdf.fragment.FavouritesFragment;
 import swati4star.createpdf.fragment.HistoryFragment;
 import swati4star.createpdf.fragment.HomeFragment;
 import swati4star.createpdf.fragment.ImageToPdfFragment;
@@ -128,6 +132,29 @@ protected void onCreate(Bundle savedInstanceState) {
         openWelcomeActivity();
     }
 
+    @Override
+    protected void onResume() {
+        super.onResume();
+        ActionBar actionBar = getSupportActionBar();
+        actionBar.show();
+    }
+
+    @Override
+    public boolean onCreateOptionsMenu(Menu menu) {
+        getMenuInflater().inflate(R.menu.menu_favourites, menu);
+        return true;
+    }
+
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (item.getItemId() == R.id.menu_favourites_item) {
+            Fragment fragment = new FavouritesFragment();
+            FragmentManager fragmentManager = getSupportFragmentManager();
+            fragmentManager.beginTransaction().replace(R.id.content, fragment).commit();
+        }
+        return super.onOptionsItemSelected(item);
+    }
+
     /**
      * if welcome activity isnt opened ever, it is shown
      */

app/src/main/java/swati4star/createpdf/fragment/FavouritesFragment.java

@@ -0,0 +1,148 @@
+package swati4star.createpdf.fragment;
+
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.design.widget.FloatingActionButton;
+import android.support.v4.app.Fragment;
+import android.support.v7.app.ActionBar;
+import android.support.v7.app.AppCompatActivity;
+import android.support.v7.preference.PreferenceManager;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import butterknife.BindView;
+import butterknife.ButterKnife;
+import swati4star.createpdf.R;
+import swati4star.createpdf.activity.FavouritesActivity;
+import swati4star.createpdf.customviews.MyCardView;
+
+import static swati4star.createpdf.util.Constants.ADD_IMAGES_KEY;
+import static swati4star.createpdf.util.Constants.ADD_PASSWORD_KEY;
+import static swati4star.createpdf.util.Constants.ADD_WATERMARK_KEY;
+import static swati4star.createpdf.util.Constants.COMPRESS_PDF_KEY;
+import static swati4star.createpdf.util.Constants.EXTRACT_IMAGES_KEY;
+import static swati4star.createpdf.util.Constants.HISTORY_KEY;
+import static swati4star.createpdf.util.Constants.IMAGE_TO_PDF_KEY;
+import static swati4star.createpdf.util.Constants.INVERT_PDF_KEY;
+import static swati4star.createpdf.util.Constants.MERGE_PDF_KEY;
+import static swati4star.createpdf.util.Constants.PDF_TO_IMAGES_KEY;
+import static swati4star.createpdf.util.Constants.QR_BARCODE_KEY;
+import static swati4star.createpdf.util.Constants.REMOVE_DUPLICATE_PAGES_KEY;
+import static swati4star.createpdf.util.Constants.REMOVE_PAGES_KEY;
+import static swati4star.createpdf.util.Constants.REMOVE_PASSWORD_KEY;
+import static swati4star.createpdf.util.Constants.REORDER_PAGES_KEY;
+import static swati4star.createpdf.util.Constants.ROTATE_PAGES_KEY;
+import static swati4star.createpdf.util.Constants.TEXT_TO_PDF_KEY;
+import static swati4star.createpdf.util.Constants.VIEW_FILES_KEY;
+
+public class FavouritesFragment extends Fragment
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+    private SharedPreferences mSharedpreferences;
+
+    @BindView(R.id.fav_add_fab)
+    FloatingActionButton mFab;
+    @BindView(R.id.images_to_pdf_fav)
+    MyCardView pref_img_to_pdf;
+    @BindView(R.id.text_to_pdf_fav)
+    MyCardView pref_text_to_pdf;
+    @BindView(R.id.qr_barcode_to_pdf_fav)
+    MyCardView pref_qr_barcode;
+    @BindView(R.id.view_files_fav)
+    MyCardView pref_view_files;
+    @BindView(R.id.view_history_fav)
+    MyCardView pref_history;
+    @BindView(R.id.add_password_fav)
+    MyCardView pref_add_password;
+    @BindView(R.id.remove_password_fav)
+    MyCardView pref_rem_pass;
+    @BindView(R.id.rotate_pages_fav)
+    MyCardView pref_rot_pages;
+    @BindView(R.id.add_watermark_fav)
+    MyCardView pref_add_watermark;
+    @BindView(R.id.add_images_fav)
+    MyCardView pref_add_images;
+    @BindView(R.id.merge_pdf_fav)
+    MyCardView pref_merge_pdf;
+    @BindView(R.id.split_pdf_fav)
+    MyCardView pref_split_pdf;
+    @BindView(R.id.invert_pdf_fav)
+    MyCardView pref_invert_pdf;
+    @BindView(R.id.compress_pdf_fav)
+    MyCardView pref_compress;
+    @BindView(R.id.remove_duplicates_pages_pdf_fav)
+    MyCardView pref_rem_dup_pages;
+    @BindView(R.id.remove_pages_fav)
+    MyCardView pref_remove_pages;
+    @BindView(R.id.rearrange_pages_fav)
+    MyCardView pref_reorder_pages;
+    @BindView(R.id.extract_images_fav)
+    MyCardView pref_extract_img;
+    @BindView(R.id.pdf_to_images_fav)
+    MyCardView pref_pdf_to_img;
+
+    @Nullable
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container,
+                             Bundle savedInstanceState) {
+        View rootview = inflater.inflate(R.layout.favourites_fragment, container, false);
+        ButterKnife.bind(this, rootview);
+        mSharedpreferences = PreferenceManager
+                .getDefaultSharedPreferences(getActivity());
+        mSharedpreferences.registerOnSharedPreferenceChangeListener(this);
+        ActionBar actionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
+        actionBar.hide();
+        mFab.setOnClickListener(v ->
+                startActivity(new Intent(this.getContext(), FavouritesActivity.class))
+        );
+        return rootview;
+    }
+
+    /**
+     * This method checks for the favourites from preferences list
+     * and passes them to another method for dealing with the required view.
+     * @param sharedPreferences
+     */
+    private void checkFavs(SharedPreferences sharedPreferences) {
+        // assigned due to onSharedPreferenceChanged
+        mSharedpreferences = sharedPreferences;
+        viewVisibility(pref_img_to_pdf, IMAGE_TO_PDF_KEY);
+        viewVisibility(pref_text_to_pdf, TEXT_TO_PDF_KEY);
+        viewVisibility(pref_qr_barcode, QR_BARCODE_KEY);
+        viewVisibility(pref_view_files, VIEW_FILES_KEY);
+        viewVisibility(pref_history, HISTORY_KEY);
+        viewVisibility(pref_add_password, ADD_PASSWORD_KEY);
+        viewVisibility(pref_rem_pass, REMOVE_PASSWORD_KEY);
+        viewVisibility(pref_rot_pages, ROTATE_PAGES_KEY);
+        viewVisibility(pref_add_watermark, ADD_WATERMARK_KEY);
+        viewVisibility(pref_add_images, ADD_IMAGES_KEY);
+        viewVisibility(pref_merge_pdf, MERGE_PDF_KEY);
+        viewVisibility(pref_invert_pdf, INVERT_PDF_KEY);
+        viewVisibility(pref_compress, COMPRESS_PDF_KEY);
+        viewVisibility(pref_rem_dup_pages, REMOVE_DUPLICATE_PAGES_KEY);
+        viewVisibility(pref_remove_pages, REMOVE_PAGES_KEY);
+        viewVisibility(pref_reorder_pages, REORDER_PAGES_KEY);
+        viewVisibility(pref_extract_img, EXTRACT_IMAGES_KEY);
+        viewVisibility(pref_pdf_to_img, PDF_TO_IMAGES_KEY);
+    }
+
+    /**
+     * This method toggles the visibility of the passed view.
+     * @param view
+     * @param id
+     */
+    private void viewVisibility(View view, String id) {
+        if (mSharedpreferences.getBoolean(id, false)) {
+            view.setVisibility(View.VISIBLE);
+        } else {
+            view.setVisibility(View.GONE);
+        }
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+        checkFavs(sharedPreferences);
+    }
+}

app/src/main/java/swati4star/createpdf/fragment/FavouritesPref.java

@@ -0,0 +1,35 @@
+package swati4star.createpdf.fragment;
+
+
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.support.v7.preference.PreferenceFragmentCompat;
+
+import swati4star.createpdf.R;
+
+public class FavouritesPref extends PreferenceFragmentCompat
+        implements SharedPreferences.OnSharedPreferenceChangeListener {
+
+    @Override
+    public void onCreatePreferences(Bundle bundle, String s) {
+        addPreferencesFromResource(R.xml.favourites_preferences);
+    }
+
+    @Override
+    public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
+    }
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        getPreferenceScreen().getSharedPreferences()
+                .registerOnSharedPreferenceChangeListener(this);
+    }
+
+    @Override
+    public void onDestroyView() {
+        super.onDestroyView();
+        getPreferenceScreen().getSharedPreferences()
+                .unregisterOnSharedPreferenceChangeListener(this);
+    }
+}

app/src/main/java/swati4star/createpdf/util/Constants.java

@@ -30,6 +30,25 @@ public class Constants {
     public static final String PG_NUM_STYLE_X = "pg_num_style_x";
     public static final String MASTER_PWD_STRING = "master_password";
 
+    public static final String IMAGE_TO_PDF_KEY = "Images to PDF";
+    public static final String TEXT_TO_PDF_KEY = "Text to PDF";
+    public static final String QR_BARCODE_KEY = "QR & Barcodes";
+    public static final String VIEW_FILES_KEY = "View Files";
+    public static final String HISTORY_KEY = "History";
+    public static final String ADD_PASSWORD_KEY = "Add password";
+    public static final String REMOVE_PASSWORD_KEY = "Remove password";
+    public static final String ROTATE_PAGES_KEY = "Rotate Pages";
+    public static final String ADD_WATERMARK_KEY = "Add Watermark";
+    public static final String ADD_IMAGES_KEY = "Add Images";
+    public static final String MERGE_PDF_KEY = "Merge PDF";
+    public static final String INVERT_PDF_KEY = "Invert Pdf";
+    public static final String COMPRESS_PDF_KEY = "Compress PDF";
+    public static final String REMOVE_DUPLICATE_PAGES_KEY = "Remove Duplicate Pages";
+    public static final String REMOVE_PAGES_KEY = "Remove Pages";
+    public static final String REORDER_PAGES_KEY = "Reorder pages";
+    public static final String EXTRACT_IMAGES_KEY = "Extract Images";
+    public static final String PDF_TO_IMAGES_KEY = "PDF to Images";
+
     public static final String BUNDLE_DATA = "bundle_data";
     public static final String REORDER_PAGES = "reorder_pages";
     public static final String REMOVE_PAGES = "remove_pages";

app/src/main/res/drawable/ic_favorite_white_24dp.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M12,21.35l-1.45,-1.32C5.4,15.36 2,12.28 2,8.5 2,5.42 4.42,3 7.5,3c1.74,0 3.41,0.81 4.5,2.09C13.09,3.81 14.76,3 16.5,3 19.58,3 22,5.42 22,8.5c0,3.78 -3.4,6.86 -8.55,11.54L12,21.35z"/>
+</vector>

app/src/main/res/layout/fav_pref_screen.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<fragment android:id="@+id/activity_settings"
+    android:name="swati4star.createpdf.fragment.FavouritesPref"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginTop="20dp"
+    xmlns:android="http://schemas.android.com/apk/res/android" />