New option to show the previous token

Closes #506

app/src/main/java/org/shadowice/flocke/andotp/Activities/MainActivity.java

@@ -491,7 +491,8 @@ public class MainActivity extends BaseActivity
                 key.equals(getString(R.string.settings_key_theme_mode)) ||
                 key.equals(getString(R.string.settings_key_theme_black_auto)) ||
                 key.equals(getString(R.string.settings_key_hide_global_timeout)) ||
-                key.equals(getString(R.string.settings_key_hide_issuer))) {
+                key.equals(getString(R.string.settings_key_hide_issuer)) ||
+                key.equals(getString(R.string.settings_key_show_prev_token))) {
             recreateActivity = true;
         }
     }

app/src/main/java/org/shadowice/flocke/andotp/Database/Entry.java

@@ -70,6 +70,7 @@ public class Entry {
     private String issuer;
     private String label;
     private String currentOTP;
+    private String prevOTP;
     private boolean visible = false;
     private Runnable hideTask = null;
     private long last_update = 0;
@@ -150,7 +151,12 @@ public class Entry {
 
         String counter = uri.getQueryParameter("counter");
         String issuer = uri.getQueryParameter("issuer");
-        String label = getStrippedLabel(issuer, uri.getPath().substring(1));
+
+        String label = "";
+
+        if (uri.getPath() != null)
+            label = getStrippedLabel(issuer, uri.getPath().substring(1));
+
         String period = uri.getQueryParameter("period");
         String digits = uri.getQueryParameter("digits");
         String algorithm = uri.getQueryParameter("algorithm");
@@ -172,6 +178,10 @@ public class Entry {
 
         this.issuer = issuer;
         this.label = label;
+
+        if (secret == null)
+            throw new Exception("Empty secret");
+
         if(type == OTPType.MOTP) {
             this.secret = secret.getBytes();
         } else {
@@ -475,6 +485,10 @@ public class Entry {
         return currentOTP;
     }
 
+    public String getPrevOTP() {
+        return prevOTP;
+    }
+
     public String getPin() {
         return pin;
     }
@@ -492,18 +506,48 @@ public class Entry {
     }
 
     public boolean updateOTP(boolean updateNow) {
-        if (type == OTPType.TOTP || type == OTPType.STEAM) {
+        if (type == OTPType.TOTP || type == OTPType.STEAM || type == OTPType.MOTP) {
             long time = System.currentTimeMillis() / 1000;
             long counter = time / this.getPeriod();
 
             if (updateNow || counter > last_update) {
-                if (type == OTPType.TOTP)
+                // Store the previous token so we don't have to recalculate it every time
-                    currentOTP = TokenCalculator.TOTP_RFC6238(secret, period, digits, algorithm);
+                if (currentOTP != null && !currentOTP.isEmpty())
-                else if (type == OTPType.STEAM)
+                    prevOTP = currentOTP;
-                    currentOTP = TokenCalculator.TOTP_Steam(secret, period, digits, algorithm);
+                else
+                    prevOTP = "";
+
+                switch (type) {
+                    case TOTP:
+                        currentOTP = TokenCalculator.TOTP_RFC6238(secret, period, digits, algorithm, 0);
+
+                        if (prevOTP == null || prevOTP.isEmpty())
+                            prevOTP = TokenCalculator.TOTP_RFC6238(secret, period, digits, algorithm, -1);
+
+                        break;
+                    case STEAM:
+                        currentOTP = TokenCalculator.TOTP_Steam(secret, period, digits, algorithm, 0);
+
+                        if (prevOTP == null || prevOTP.isEmpty())
+                            prevOTP = TokenCalculator.TOTP_Steam(secret, period, digits, algorithm, -1);
+
+                        break;
+                    case MOTP:
+                        String currentPin = this.getPin();
+
+                        if (currentPin.isEmpty()) {
+                            currentOTP = MOTP_NO_PIN_CODE;
+                        } else {
+                            currentOTP = TokenCalculator.MOTP(currentPin, new String(this.secret), time, 0);
+
+                            if (prevOTP == null || prevOTP.isEmpty())
+                                prevOTP = TokenCalculator.MOTP(currentPin, new String(this.secret), time, -1);
+                        }
+
+                        break;
+                }
 
                 last_update = counter;
-                //New OTP. Change color to default color
                 setColor(COLOR_DEFAULT);
                 return true;
             } else {
@@ -512,22 +556,6 @@ public class Entry {
         } else if (type == OTPType.HOTP) {
             currentOTP = TokenCalculator.HOTP(secret, counter, digits, algorithm);
             return true;
-        } else if (type == OTPType.MOTP) {
-            long time = System.currentTimeMillis() / 1000;
-            long counter = time / this.getPeriod();
-            if (counter > last_update || updateNow) {
-                String currentPin = this.getPin();
-                if (currentPin.isEmpty()) {
-                    currentOTP = MOTP_NO_PIN_CODE;
-                } else {
-                    currentOTP = TokenCalculator.MOTP(currentPin, new String(this.secret), time);
-                }
-                last_update = counter;
-                setColor(COLOR_DEFAULT);
-                return true;
-            } else {
-                return false;
-            }
         } else {
             return false;
         }

app/src/main/java/org/shadowice/flocke/andotp/Utilities/Settings.java

@@ -675,4 +675,8 @@ public class Settings {
         String labelDisplay = getString(R.string.settings_key_label_display, R.string.settings_default_label_display);
         return Constants.LabelDisplay.valueOf(labelDisplay.toUpperCase(Locale.ENGLISH));
     }
+
+    public boolean getShowPrevToken() {
+        return getBoolean(R.string.settings_key_show_prev_token, false);
+    }
 }

app/src/main/java/org/shadowice/flocke/andotp/Utilities/TokenCalculator.java

@@ -61,19 +61,24 @@ public class TokenCalculator {
         return mac.doFinal(data);
     }
 
+    // TODO: Rewrite tests so this compatibility wrapper can be removed
     public static int TOTP_RFC6238(byte[] secret, int period, long time, int digits, HashAlgorithm algorithm) {
-        int fullToken = TOTP(secret, period, time, algorithm);
+        return TOTP_RFC6238(secret, period, time, digits, algorithm, 0);
+    }
+
+    public static int TOTP_RFC6238(byte[] secret, int period, long time, int digits, HashAlgorithm algorithm, int offset) {
+        int fullToken = TOTP(secret, period, time, algorithm, offset);
         int div = (int) Math.pow(10, digits);
 
         return fullToken % div;
     }
 
-    public static String TOTP_RFC6238(byte[] secret, int period, int digits, HashAlgorithm algorithm) {
+    public static String TOTP_RFC6238(byte[] secret, int period, int digits, HashAlgorithm algorithm, int offset) {
-        return Tools.formatTokenString(TOTP_RFC6238(secret, period, System.currentTimeMillis() / 1000, digits, algorithm), digits);
+        return Tools.formatTokenString(TOTP_RFC6238(secret, period, System.currentTimeMillis() / 1000, digits, algorithm, offset), digits);
     }
 
-    public static String TOTP_Steam(byte[] secret, int period, int digits, HashAlgorithm algorithm) {
+    public static String TOTP_Steam(byte[] secret, int period, int digits, HashAlgorithm algorithm, int offset) {
-        int fullToken = TOTP(secret, period, System.currentTimeMillis() / 1000, algorithm);
+        int fullToken = TOTP(secret, period, System.currentTimeMillis() / 1000, algorithm, offset);
 
         StringBuilder tokenBuilder = new StringBuilder();
 
@@ -92,8 +97,8 @@ public class TokenCalculator {
         return Tools.formatTokenString(fullToken % div, digits);
     }
 
-    private static int TOTP(byte[] key, int period, long time, HashAlgorithm algorithm) {
+    private static int TOTP(byte[] key, int period, long time, HashAlgorithm algorithm, int offset) {
-        return HOTP(key, time / period, algorithm);
+        return HOTP(key, (time / period) + offset, algorithm);
     }
 
     private static int HOTP(byte[] key, long counter, HashAlgorithm algorithm)
@@ -119,9 +124,9 @@ public class TokenCalculator {
         return r;
     }
 
-    public static String MOTP(String PIN, String secret, long epoch)
+    public static String MOTP(String PIN, String secret, long epoch, int offset)
     {
-        String epochText = String.valueOf(epoch / 10);
+        String epochText = String.valueOf((epoch / 10) + offset);
         String hashText = epochText + secret + PIN;
         String otp = "";
 

app/src/main/java/org/shadowice/flocke/andotp/View/EntryViewHolder.java

@@ -69,11 +69,11 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
     private final LinearLayout coverLayout;
     private final LinearLayout counterLayout;
     private final FrameLayout thumbnailFrame;
-    private final ImageView visibleImg;
     private final ImageView thumbnailImg;
     private final ImageButton menuButton;
     private final ImageButton copyButton;
     private final TextView value;
+    private final TextView valuePrev;
     private final TextView label;
     private final TextView counter;
     private final TextView tags;
@@ -86,8 +86,8 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
 
         card = v.findViewById(R.id.card_view);
         value = v.findViewById(R.id.valueText);
+        valuePrev = v.findViewById(R.id.valueTextPrev);
         valueLayout = v.findViewById(R.id.valueLayout);
-        visibleImg = v.findViewById(R.id.valueImg);
         thumbnailFrame = v.findViewById(R.id.thumbnailFrame);
         thumbnailImg = v.findViewById(R.id.thumbnailImg);
         coverLayout = v.findViewById(R.id.coverLayout);
@@ -106,7 +106,6 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
 
         menuButton.getDrawable().setColorFilter(colorFilter);
         copyButton.getDrawable().setColorFilter(colorFilter);
-        visibleImg.getDrawable().setColorFilter(colorFilter);
         invisibleImg.getDrawable().setColorFilter(colorFilter);
 
         setupOnClickListeners(menuButton, copyButton);
@@ -221,6 +220,21 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
         // save the unformatted token to the tag of this TextView for copy/paste
         value.setTag(entry.getCurrentOTP());
 
+        if (settings.getShowPrevToken()) {
+            String tokenPrev = entry.getPrevOTP();
+
+            if (tokenPrev != null && !tokenPrev.isEmpty()) {
+                String tokenFormattedPrev = Tools.formatToken(tokenPrev, settings.getTokenSplitGroupSize());
+
+                valuePrev.setVisibility(View.VISIBLE);
+                valuePrev.setText(tokenFormattedPrev);
+            } else {
+                valuePrev.setVisibility(View.GONE);
+            }
+        } else {
+            valuePrev.setVisibility(View.GONE);
+        }
+
         List<String> entryTags = entry.getTags();
 
         StringBuilder stringBuilder = new StringBuilder();
@@ -255,11 +269,9 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
             if (entry.isVisible()) {
                 valueLayout.setVisibility(View.VISIBLE);
                 coverLayout.setVisibility(View.GONE);
-                visibleImg.setVisibility(View.GONE);
             } else {
                 valueLayout.setVisibility(View.GONE);
                 coverLayout.setVisibility(View.VISIBLE);
-                visibleImg.setVisibility(View.VISIBLE);
             }
         }
     }
@@ -316,11 +328,9 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
         if (enabled) {
             valueLayout.setVisibility(View.GONE);
             coverLayout.setVisibility(View.VISIBLE);
-            visibleImg.setVisibility(View.VISIBLE);
         } else {
             valueLayout.setVisibility(View.VISIBLE);
             coverLayout.setVisibility(View.GONE);
-            visibleImg.setVisibility(View.GONE);
         }
     }
 
@@ -369,5 +379,6 @@ public class EntryViewHolder extends RecyclerView.ViewHolder
         }
 
         value.setTextColor(textColor);
+        valuePrev.setTextColor(textColor);
     }
 }

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

@@ -1,13 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/card_view"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginTop="@dimen/activity_margin_xxsmall"
     android:layout_marginBottom="@dimen/activity_margin_xxsmall"
     android:clickable="true"
+    android:focusable="true"
     android:foreground="?android:attr/selectableItemBackground"
     app:contentPadding="0dp"
     style="?attr/cardStyle">
@@ -21,7 +22,8 @@
             android:orientation="horizontal"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:baselineAligned="false">
+            android:baselineAligned="false"
+            tools:ignore="UselessParent">
 
             <FrameLayout
                 android:id="@+id/thumbnailFrame"
@@ -36,7 +38,8 @@
                     android:layout_width="@dimen/card_thumbnail_size"
                     android:layout_height="@dimen/card_thumbnail_size"
                     android:layout_gravity="center"
-                    android:src="@mipmap/ic_launcher" />
+                    android:src="@mipmap/ic_launcher"
+                    tools:ignore="ContentDescription" />
 
             </FrameLayout>
 
@@ -72,28 +75,31 @@
                                 android:layout_height="wrap_content"
                                 android:visibility="gone">
 
-                                <ImageView
-                                    android:id="@+id/valueImg"
-                                    android:layout_width="wrap_content"
-                                    android:layout_height="match_parent"
-                                    android:layout_marginEnd="@dimen/activity_margin_small"
-                                    app:srcCompat="@drawable/ic_visibility_visible"/>
-
                                 <TextView
-                                    android:textDirection="ltr"
                                     android:id="@+id/valueText"
                                     android:layout_width="wrap_content"
                                     android:layout_height="wrap_content"
                                     android:textColor="?android:attr/textColorSecondary"
+                                    android:textDirection="ltr"
                                     android:textSize="24sp"
                                     android:textStyle="bold" />
 
+                                <TextView
+                                    android:id="@+id/valueTextPrev"
+                                    android:layout_width="wrap_content"
+                                    android:layout_height="wrap_content"
+                                    android:textColor="?android:attr/textColorSecondary"
+                                    android:textDirection="ltr"
+                                    android:layout_marginStart="@dimen/activity_margin_small"
+                                    tools:ignore="HardcodedText" />
+
                             </LinearLayout>
 
                             <LinearLayout
                                 android:id="@+id/coverLayout"
                                 android:layout_width="wrap_content"
-                                android:layout_height="wrap_content">
+                                android:layout_height="wrap_content"
+                                tools:ignore="UseCompoundDrawables">
 
                                 <ImageView
                                     android:id="@+id/coverImg"
@@ -101,6 +107,7 @@
                                     android:layout_height="match_parent"
                                     android:layout_marginEnd="@dimen/activity_margin_small"
                                     android:alpha="0.4"
+                                    android:contentDescription="@string/label_hidden"
                                     app:srcCompat="@drawable/ic_visibility_invisible"/>
 
                                 <TextView
@@ -122,7 +129,8 @@
                             android:maxLines="1"
                             android:ellipsize="end"
                             android:text="Label"
-                            android:textSize="18sp" />
+                            android:textSize="18sp"
+                            tools:ignore="HardcodedText" />
 
                         <TextView
                             android:id="@+id/textViewTags"
@@ -131,7 +139,8 @@
                             android:maxLines="1"
                             android:ellipsize="end"
                             android:text="Tags"
-                            android:textSize="13.5sp" />
+                            android:textSize="13.5sp"
+                            tools:ignore="HardcodedText" />
 
                     </LinearLayout>
 
@@ -146,12 +155,14 @@
                             android:layout_height="wrap_content"
                             android:layout_marginEnd="@dimen/activity_horizontal_margin"
                             android:visibility="gone"
-                            android:orientation="horizontal" >
+                            android:orientation="horizontal"
+                            tools:ignore="UseCompoundDrawables">
 
                             <ImageView
                                 android:layout_width="wrap_content"
                                 android:layout_height="match_parent"
-                                app:srcCompat="@drawable/ic_alarm_gray" />
+                                app:srcCompat="@drawable/ic_alarm_gray"
+                                tools:ignore="ContentDescription" />
 
                             <TextView
                                 android:id="@+id/customPeriod"
@@ -190,6 +201,7 @@
                             android:layout_gravity="center_vertical"
                             android:padding="@dimen/activity_margin_small"
                             android:background="?android:attr/selectableItemBackground"
+                            android:contentDescription="@string/button_card_copy"
                             app:srcCompat="@drawable/ic_content_copy_gray" />
 
                         <ImageButton
@@ -199,6 +211,7 @@
                             android:layout_gravity="center_vertical"
                             android:padding="@dimen/activity_margin_small"
                             android:background="?android:attr/selectableItemBackground"
+                            android:contentDescription="@string/button_card_options"
                             app:srcCompat="@drawable/ic_more_vert_gray" />
                     </LinearLayout>
 

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

@@ -2,15 +2,17 @@
 <androidx.cardview.widget.CardView
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/card_view"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginTop="@dimen/activity_margin_xsmall"
     android:layout_marginBottom="@dimen/activity_margin_xsmall"
     android:clickable="true"
+    android:focusable="true"
     android:foreground="?android:attr/selectableItemBackground"
     app:contentPadding="0dp"
-    style="?attr/cardStyle">
+    style="?attr/cardStyle" >
 
     <LinearLayout
         android:orientation="vertical"
@@ -21,7 +23,8 @@
             android:orientation="horizontal"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:baselineAligned="false">
+            android:baselineAligned="false"
+            tools:ignore="UselessParent">
 
             <FrameLayout
                 android:id="@+id/thumbnailFrame"
@@ -36,7 +39,8 @@
                     android:layout_width="@dimen/card_thumbnail_size"
                     android:layout_height="@dimen/card_thumbnail_size"
                     android:layout_gravity="center"
-                    android:src="@mipmap/ic_launcher" />
+                    android:src="@mipmap/ic_launcher"
+                    tools:ignore="ContentDescription" />
 
             </FrameLayout>
 
@@ -72,28 +76,33 @@
                                 android:layout_height="wrap_content"
                                 android:visibility="gone">
 
-                                <ImageView
-                                    android:id="@+id/valueImg"
-                                    android:layout_width="wrap_content"
-                                    android:layout_height="match_parent"
-                                    android:layout_marginEnd="@dimen/activity_margin_small"
-                                    app:srcCompat="@drawable/ic_visibility_visible"/>
-
                                 <TextView
-                                    android:textDirection="ltr"
                                     android:id="@+id/valueText"
                                     android:layout_width="wrap_content"
                                     android:layout_height="wrap_content"
                                     android:textColor="?android:attr/textColorSecondary"
                                     android:textSize="28sp"
-                                    android:textStyle="bold" />
+                                    android:textStyle="bold"
+                                    android:textDirection="ltr"
+                                    tools:ignore="HardcodedText" />
+
+                                <TextView
+                                    android:id="@+id/valueTextPrev"
+                                    android:layout_width="wrap_content"
+                                    android:layout_height="wrap_content"
+                                    android:textColor="?android:attr/textColorSecondary"
+                                    android:textDirection="ltr"
+                                    android:layout_marginStart="@dimen/activity_margin_small"
+                                    tools:ignore="HardcodedText" />
 
                             </LinearLayout>
 
                             <LinearLayout
                                 android:id="@+id/coverLayout"
                                 android:layout_width="wrap_content"
-                                android:layout_height="wrap_content">
+                                android:layout_height="wrap_content"
+                                android:visibility="visible"
+                                tools:ignore="UseCompoundDrawables">
 
                                 <ImageView
                                     android:id="@+id/coverImg"
@@ -101,7 +110,8 @@
                                     android:layout_height="match_parent"
                                     android:layout_marginEnd="@dimen/activity_margin_small"
                                     android:alpha="0.4"
-                                    app:srcCompat="@drawable/ic_visibility_invisible"/>
+                                    android:contentDescription="@string/label_hidden"
+                                    app:srcCompat="@drawable/ic_visibility_invisible" />
 
                                 <TextView
                                     android:layout_width="wrap_content"
@@ -122,7 +132,8 @@
                             android:maxLines="1"
                             android:ellipsize="end"
                             android:text="Label"
-                            android:textSize="18sp" />
+                            android:textSize="18sp"
+                            tools:ignore="HardcodedText" />
 
                         <TextView
                             android:id="@+id/textViewTags"
@@ -131,7 +142,8 @@
                             android:maxLines="1"
                             android:ellipsize="end"
                             android:text="Tags"
-                            android:textSize="13.5sp" />
+                            android:textSize="13.5sp"
+                            tools:ignore="HardcodedText" />
 
                     </LinearLayout>
 
@@ -146,12 +158,14 @@
                             android:layout_height="wrap_content"
                             android:layout_marginEnd="@dimen/activity_horizontal_margin"
                             android:visibility="gone"
-                            android:orientation="horizontal" >
+                            android:orientation="horizontal"
+                            tools:ignore="UseCompoundDrawables">
 
                             <ImageView
                                 android:layout_width="wrap_content"
                                 android:layout_height="match_parent"
-                                app:srcCompat="@drawable/ic_alarm_gray" />
+                                app:srcCompat="@drawable/ic_alarm_gray"
+                                tools:ignore="ContentDescription" />
 
                             <TextView
                                 android:id="@+id/customPeriod"

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

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.cardview.widget.CardView
+<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/card_view"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
@@ -9,6 +9,7 @@
     android:layout_marginBottom="@dimen/activity_margin_xsmall"
     app:contentPadding="0dp"
     android:clickable="true"
+    android:focusable="true"
     android:foreground="?android:attr/selectableItemBackground"
     style="?attr/cardStyle">
 
@@ -21,7 +22,8 @@
             android:orientation="horizontal"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:baselineAligned="false">
+            android:baselineAligned="false"
+            tools:ignore="UselessParent">
 
             <FrameLayout
                 android:id="@+id/thumbnailFrame"
@@ -29,14 +31,16 @@
                 android:layout_height="match_parent"
                 android:padding="@dimen/activity_margin"
                 android:paddingStart="@dimen/card_padding_without_corners"
-                android:background="?attr/thumbnailBackground">
+                android:background="?attr/thumbnailBackground"
+                tools:ignore="RtlSymmetry">
 
                 <ImageView
                     android:id="@+id/thumbnailImg"
                     android:layout_width="@dimen/card_thumbnail_size"
                     android:layout_height="@dimen/card_thumbnail_size"
                     android:layout_gravity="center"
-                    android:src="@mipmap/ic_launcher" />
+                    android:src="@mipmap/ic_launcher"
+                    tools:ignore="ContentDescription" />
 
             </FrameLayout>
 
@@ -69,13 +73,6 @@
                                 android:layout_height="wrap_content"
                                 android:visibility="gone">
 
-                                <ImageView
-                                    android:id="@+id/valueImg"
-                                    android:layout_width="wrap_content"
-                                    android:layout_height="match_parent"
-                                    android:layout_marginEnd="@dimen/activity_margin_small"
-                                    app:srcCompat="@drawable/ic_visibility_visible"/>
-
                                 <TextView
                                     android:textDirection="ltr"
                                     android:id="@+id/valueText"
@@ -85,12 +82,22 @@
                                     android:textSize="28sp"
                                     android:textStyle="bold" />
 
+                                <TextView
+                                    android:id="@+id/valueTextPrev"
+                                    android:layout_width="wrap_content"
+                                    android:layout_height="wrap_content"
+                                    android:layout_marginStart="@dimen/activity_margin_small"
+                                    android:textColor="?android:attr/textColorSecondary"
+                                    android:textDirection="ltr"
+                                    tools:ignore="HardcodedText" />
+
                             </LinearLayout>
 
                             <LinearLayout
                                 android:id="@+id/coverLayout"
                                 android:layout_width="wrap_content"
-                                android:layout_height="wrap_content">
+                                android:layout_height="wrap_content"
+                                tools:ignore="UseCompoundDrawables">
 
                                 <ImageView
                                     android:id="@+id/coverImg"
@@ -98,6 +105,7 @@
                                     android:layout_height="match_parent"
                                     android:layout_marginEnd="@dimen/activity_margin_small"
                                     android:alpha="0.4"
+                                    android:contentDescription="@string/label_hidden"
                                     app:srcCompat="@drawable/ic_visibility_invisible"/>
 
                                 <TextView
@@ -119,7 +127,8 @@
                             android:maxLines="1"
                             android:ellipsize="end"
                             android:textSize="18sp"
-                            android:text="Label"/>
+                            android:text="Label"
+                            tools:ignore="HardcodedText" />
 
                         <TextView
                             android:id="@+id/textViewTags"
@@ -128,7 +137,8 @@
                             android:maxLines="1"
                             android:ellipsize="end"
                             android:textSize="13.5sp"
-                            android:text="Tags"/>
+                            android:text="Tags"
+                            tools:ignore="HardcodedText" />
 
                     </LinearLayout>
 
@@ -143,12 +153,14 @@
                             android:layout_height="wrap_content"
                             android:layout_marginEnd="@dimen/activity_horizontal_margin"
                             android:visibility="gone"
-                            android:orientation="horizontal" >
+                            android:orientation="horizontal"
+                            tools:ignore="UseCompoundDrawables">
 
                             <ImageView
                                 android:layout_width="wrap_content"
                                 android:layout_height="match_parent"
-                                app:srcCompat="@drawable/ic_alarm_gray" />
+                                app:srcCompat="@drawable/ic_alarm_gray"
+                                tools:ignore="ContentDescription" />
 
                             <TextView
                                 android:id="@+id/customPeriod"
@@ -187,6 +199,7 @@
                             android:layout_gravity="center_vertical"
                             android:padding="@dimen/activity_margin_small"
                             android:background="?android:attr/selectableItemBackground"
+                            android:contentDescription="@string/button_card_copy"
                             app:srcCompat="@drawable/ic_content_copy_gray" />
 
                         <ImageButton
@@ -196,6 +209,7 @@
                             android:layout_gravity="center_vertical"
                             android:padding="@dimen/activity_margin_small"
                             android:background="?android:attr/selectableItemBackground"
+                            android:contentDescription="@string/button_card_options"
                             app:srcCompat="@drawable/ic_more_vert_gray" />
                     </LinearLayout>
 

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

@@ -29,6 +29,7 @@
     <string name="settings_key_theme_mode" translatable="false">perf_theme_mode</string>
     <string name="settings_key_theme_black_auto" translatable="false">pref_theme_black_auto</string>
     <string name="settings_key_theme" translatable="false">pref_theme</string>
+    <string name="settings_key_show_prev_token" translatable="false">pref_show_prev_token</string>
     <string name="settings_key_label_size" translatable="false">pref_label_size_sp</string>
     <string name="settings_key_card_layout" translatable="false">pref_card_layout</string>
     <string name="settings_key_label_scroll" translatable="false">pref_label_scroll</string>            <!-- Deprecated -->

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

@@ -1,5 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
-<resources>
+<resources
+    xmlns:tools="http://schemas.android.com/tools"
+    tools:ignore="MissingTranslation">
+
     <string name="settings_activity_title">Settings</string>
 
     <!-- Categories -->
@@ -28,6 +31,7 @@
     <string name="settings_title_theme_black_auto">Black theme</string>
     <string name="settings_title_theme">Theme</string>
     <string name="settings_title_card_layout">Card layout</string>
+    <string name="settings_title_show_prev_token">Show previous token</string>
     <string name="settings_title_label_size">Label font size</string>
     <string name="settings_title_label_display">Label display</string>
     <string name="settings_title_tap_single">Single-tap</string>
@@ -84,6 +88,7 @@
         above 8.0 (Oreo)</string>
 
     <string name="settings_desc_theme_black_auto">Use the black theme in dark mode</string>
+    <string name="settings_desc_show_prev_token">Show the previous token in addition to the current one</string>
     <string name="settings_desc_minimize_on_copy">App will be minimized when you copy the OTP to clipboard</string>
     <string name="settings_desc_search_includes">Specify which values should be included when searching</string>
     <string name="settings_desc_label_highlight_token">Highlights token in red if it\'s expiring in 8 seconds</string>

app/src/main/res/xml/preferences.xml

@@ -143,6 +143,12 @@
             android:entryValues="@array/settings_values_tap"
             android:defaultValue="@string/settings_default_tap_double" />
 
+        <CheckBoxPreference
+            android:key="@string/settings_key_show_prev_token"
+            android:title="@string/settings_title_show_prev_token"
+            android:summary="@string/settings_desc_show_prev_token"
+            android:defaultValue="false" />
+
         <org.shadowice.flocke.andotp.Preferences.NumberPickerPreference
             android:key="@string/settings_key_label_size"
             android:title="@string/settings_title_label_size"