Fix issue "home button" issue with screen lock

Fixes #7475

res/layout/prompt_passphrase_activity.xml

@@ -51,7 +51,7 @@
         <TextView android:layout_width="match_parent"
                   android:layout_height="wrap_content"
                   android:layout_marginBottom="40dp"
-                  android:text="@string/prompt_passphrase_activity__unlock_signal"
+                  android:text="@string/prompt_passphrase_activity__signal_is_locked"
                   android:gravity="center_horizontal"
                   android:textSize="25sp"/>
 
@@ -66,6 +66,18 @@
                 android:layout_marginBottom="60dp"
                 tools:visibility="visible"/>
 
+        <TextView android:id="@+id/lock_screen_auth_container"
+                  android:layout_width="match_parent"
+                  android:layout_height="wrap_content"
+                  android:background="@drawable/rounded_rectangle_dark"
+                  android:backgroundTint="@color/signal_primary"
+                  android:textColor="@color/white"
+                  android:gravity="center_horizontal"
+                  android:elevation="3dp"
+                  android:padding="10dp"
+                  android:text="@string/prompt_passphrase_activity__tap_to_unlock"
+                  tools:visibility="gone"/>
+
         <RelativeLayout android:id="@+id/password_auth_container"
                         android:layout_width="match_parent"
                         android:layout_height="wrap_content"

res/values/strings.xml

@@ -1399,6 +1399,8 @@
     <string name="RegistrationLockDialog_disable">Disable</string>
     <string name="RegistrationActivity_continue">Continue</string>
     <string name="preferences_chats__backups">Backups</string>
+    <string name="prompt_passphrase_activity__signal_is_locked">Signal is locked</string>
+    <string name="prompt_passphrase_activity__tap_to_unlock">TAP TO UNLOCK</string>
     <!-- EOF -->
 
 </resources>

src/org/thoughtcrime/securesms/PassphrasePromptActivity.java

@@ -70,7 +70,9 @@ public class PassphrasePromptActivity extends PassphraseActivity {
   private DynamicIntroTheme dynamicTheme    = new DynamicIntroTheme();
   private DynamicLanguage   dynamicLanguage = new DynamicLanguage();
 
+  private View            passphraseAuthContainer;
   private ImageView       fingerprintPrompt;
+  private TextView        lockScreenButton;
 
   private EditText        passphraseText;
   private ImageButton     showButton;
@@ -82,6 +84,7 @@ public class PassphrasePromptActivity extends PassphraseActivity {
   private FingerprintListener      fingerprintListener;
 
   private boolean authenticated;
+  private boolean failure;
 
   @Override
   public void onCreate(Bundle savedInstanceState) {
@@ -102,9 +105,13 @@ public class PassphrasePromptActivity extends PassphraseActivity {
     dynamicTheme.onResume(this);
     dynamicLanguage.onResume(this);
 
-    if (TextSecurePreferences.isScreenLockEnabled(this) && !authenticated) {
+    setLockTypeVisibility();
+
+    if (TextSecurePreferences.isScreenLockEnabled(this) && !authenticated && !failure) {
       resumeScreenLock();
     }
+
+    failure = false;
   }
 
   @Override
@@ -149,7 +156,7 @@ public class PassphrasePromptActivity extends PassphraseActivity {
       handleAuthenticated();
     } else {
       Log.w(TAG, "Authentication failed");
-      finish();
+      failure = true;
     }
   }
 
@@ -196,7 +203,7 @@ public class PassphrasePromptActivity extends PassphraseActivity {
   }
 
   private void initializeResources() {
-    View        passphraseAuthContainer = findViewById(R.id.password_auth_container);
+
     ImageButton okButton = findViewById(R.id.ok_button);
     Toolbar     toolbar  = findViewById(R.id.toolbar);
 
@@ -204,7 +211,9 @@ public class PassphrasePromptActivity extends PassphraseActivity {
     hideButton                    = findViewById(R.id.passphrase_visibility_off);
     visibilityToggle              = findViewById(R.id.button_toggle);
     passphraseText                = findViewById(R.id.passphrase_edit);
+    passphraseAuthContainer       = findViewById(R.id.password_auth_container);
     fingerprintPrompt             = findViewById(R.id.fingerprint_auth_container);
+    lockScreenButton              = findViewById(R.id.lock_screen_auth_container);
     fingerprintManager            = FingerprintManagerCompat.from(this);
     fingerprintCancellationSignal = new CancellationSignal();
     fingerprintListener           = new FingerprintListener();
@@ -227,12 +236,24 @@ public class PassphrasePromptActivity extends PassphraseActivity {
     fingerprintPrompt.setImageResource(R.drawable.ic_fingerprint_white_48dp);
     fingerprintPrompt.getBackground().setColorFilter(getResources().getColor(R.color.signal_primary), PorterDuff.Mode.SRC_IN);
 
+    lockScreenButton.setOnClickListener(v -> resumeScreenLock());
+  }
+
+  private void setLockTypeVisibility() {
     if (TextSecurePreferences.isScreenLockEnabled(this)) {
       passphraseAuthContainer.setVisibility(View.GONE);
+
+      if (fingerprintManager.isHardwareDetected() && fingerprintManager.hasEnrolledFingerprints()) {
         fingerprintPrompt.setVisibility(View.VISIBLE);
+        lockScreenButton.setVisibility(View.GONE);
+      } else {
+        fingerprintPrompt.setVisibility(View.GONE);
+        lockScreenButton.setVisibility(View.VISIBLE);
+      }
     } else {
       passphraseAuthContainer.setVisibility(View.VISIBLE);
       fingerprintPrompt.setVisibility(View.GONE);
+      lockScreenButton.setVisibility(View.GONE);
     }
   }