finish layout change

Author: katcom

app/build.gradle

@@ -30,6 +30,7 @@ dependencies {
     implementation 'com.google.android.material:material:1.0.0'
     implementation 'net.zetetic:android-database-sqlcipher:4.4.2@aar'
     implementation "androidx.sqlite:sqlite:2.0.1"
+    implementation "androidx.preference:preference:1.1.1"
 
     implementation 'commons-codec:commons-codec:1.15'
 }

app/src/main/AndroidManifest.xml

@@ -14,7 +14,6 @@
         <activity
             android:name=".VaultActivity"
             android:exported="false">
-
         </activity>
         <activity
             android:name=".ImageViewerActivity"
@@ -31,6 +30,10 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity android:name=".SettingSection.SettingActivity"/>
+        <activity android:name=".HelpActivity"/>
+        <activity android:name=".AboutActivity"/>
+
         <provider
             android:name="androidx.core.content.FileProvider"
             android:authorities="com.katcom.androidFileVault.fileprovider"

app/src/main/java/com/katcom/androidFileVault/AboutActivity.java

@@ -0,0 +1,10 @@
+package com.katcom.androidFileVault;
+
+import androidx.fragment.app.Fragment;
+
+public class AboutActivity extends SingleFragmentActivity {
+    @Override
+    protected Fragment createFragment() {
+        return new AboutFragment();
+    }
+}

app/src/main/java/com/katcom/androidFileVault/AboutFragment.java

@@ -0,0 +1,6 @@
+package com.katcom.androidFileVault;
+
+import androidx.fragment.app.Fragment;
+
+public class AboutFragment extends Fragment {
+}

app/src/main/java/com/katcom/androidFileVault/CloseReceiver.java

@@ -6,7 +6,7 @@
 import android.content.Intent;
 
 /**
- * Close the app by killing all activities using broadcast
+ * This broadcast receiver is used to close the app by killing all activities using broadcast
  * Ref:https://blog.csdn.net/totond/article/details/72960211
  */
 public class CloseReceiver extends BroadcastReceiver {

app/src/main/java/com/katcom/androidFileVault/CustomedCrypto/CustomCipherInputStream.java

@@ -71,6 +71,12 @@
  * @since 1.4
  */
 
+/**
+ * The CipherInputStream has been overwritten in this project because the original Cipher
+ * because the buffer size in the original implementation is simply 512 bytes
+ * which significantly slows down the encryption. The buffer is changed to be 8192 bytes long
+ * so that the encryption would work faster.
+ */
 public class CustomCipherInputStream extends FilterInputStream {
 
     // the cipher engine to use to process stream data

app/src/main/java/com/katcom/androidFileVault/HelpActivity.java

@@ -0,0 +1,10 @@
+package com.katcom.androidFileVault;
+
+import androidx.fragment.app.Fragment;
+
+public class HelpActivity extends SingleFragmentActivity {
+    @Override
+    protected Fragment createFragment() {
+        return new HelpFragment();
+    }
+}

app/src/main/java/com/katcom/androidFileVault/HelpFragment.java

@@ -0,0 +1,6 @@
+package com.katcom.androidFileVault;
+
+import androidx.fragment.app.Fragment;
+
+public class HelpFragment extends Fragment {
+}

app/src/main/java/com/katcom/androidFileVault/ImageViewerFragment.java

@@ -85,7 +85,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
         super.onOptionsItemSelected(item);
         switch (item.getItemId()) {
             case R.id.menu_image_viewer_export:
-                export();
+                showFileExplorerForExport();
                 break;
             case R.id.menu_image_viewer_share:
                 share();
@@ -94,7 +94,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
         return true;
     }
 
-    private void export() {
+    private void showFileExplorerForExport() {
         Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
         intent.addCategory(Intent.CATEGORY_OPENABLE);
         intent.setType("image/*");

app/src/main/java/com/katcom/androidFileVault/SecureSharePreference/SecureSharePreference.java

@@ -1,5 +1,5 @@
 /**
- * The SecureSharePreference is an costumed extension of SharePreference, a light-weight database provided by Android.
+ * The SecureSharePreference is a custom extension of SharePreference, a light-weight database provided by Android.
  * SecureSharePreference would encrypt the records before storing it in the database file,
  * Instead of storing the plain text.
  *