Exclude from recents when using biometric authentication

app/src/main/java/eu/faircode/email/ActivityBase.java

@@ -156,6 +156,20 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
         super.onActivityResult(requestCode, resultCode, data);
     }
 
+    @Override
+    public void startActivity(Intent intent) {
+        if (Helper.hasAuthentication(this))
+            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        super.startActivity(intent);
+    }
+
+    @Override
+    public void startActivityForResult(Intent intent, int requestCode) {
+        if (Helper.hasAuthentication(this))
+            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        super.startActivityForResult(intent, requestCode);
+    }
+
     @Override
     public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
         Log.i("Preference " + key + "=" + prefs.getAll().get(key));

app/src/main/java/eu/faircode/email/ActivityMain.java

@@ -27,14 +27,13 @@ import android.os.Build;
 import android.os.Bundle;
 import android.os.Handler;
 
-import androidx.appcompat.app.AppCompatActivity;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
 import androidx.preference.PreferenceManager;
 
 import java.util.List;
 
-public class ActivityMain extends AppCompatActivity implements FragmentManager.OnBackStackChangedListener, SharedPreferences.OnSharedPreferenceChangeListener {
+public class ActivityMain extends ActivityBase implements FragmentManager.OnBackStackChangedListener, SharedPreferences.OnSharedPreferenceChangeListener {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         getSupportFragmentManager().addOnBackStackChangedListener(this);

app/src/main/java/eu/faircode/email/DialogFragmentEx.java

@@ -39,4 +39,18 @@ public class DialogFragmentEx extends DialogFragment {
             }
         }
     }
+
+    @Override
+    public void startActivity(Intent intent) {
+        if (Helper.hasAuthentication(getContext()))
+            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        super.startActivity(intent);
+    }
+
+    @Override
+    public void startActivityForResult(Intent intent, int requestCode) {
+        if (Helper.hasAuthentication(getContext()))
+            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        super.startActivityForResult(intent, requestCode);
+    }
 }

app/src/main/java/eu/faircode/email/FragmentBase.java

@@ -53,6 +53,20 @@ public class FragmentBase extends Fragment {
         updateSubtitle();
     }
 
+    @Override
+    public void startActivity(Intent intent) {
+        if (Helper.hasAuthentication(getContext()))
+            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        super.startActivity(intent);
+    }
+
+    @Override
+    public void startActivityForResult(Intent intent, int requestCode) {
+        if (Helper.hasAuthentication(getContext()))
+            intent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
+        super.startActivityForResult(intent, requestCode);
+    }
+
     protected void finish() {
         if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
             getFragmentManager().popBackStack();

app/src/main/java/eu/faircode/email/Helper.java

@@ -655,6 +655,11 @@ public class Helper {
         return Objects.equals(signed, expected);
     }
 
+    static boolean hasAuthentication(Context context) {
+        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
+        return prefs.getBoolean("biometrics", false);
+    }
+
     static boolean shouldAuthenticate(Context context) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         boolean biometrics = prefs.getBoolean("biometrics", false);