Use a static getter to fetch the preferred payment setting

We need to use this from the system server before the NFC service has
started. This makes getting an instance of `CardEmulation` difficult, so
instead make it into a static method and access the setting directly
instead of via the service.

Bug: 321098555
Test: manual,NFC CTS tests
Change-Id: I92e7cfeb595a13b8d544b4a3169601748fef7101

2 files changed, 18 insertions, 19 deletions

diff --git a/nfc/api/system-current.txt b/nfc/api/system-current.txt
index 40672a1adc15..1e6b401b3741 100644
--- a/nfc/api/system-current.txt
+++ b/nfc/api/system-current.txt
@@ -45,7 +45,7 @@ package android.nfc {
 package android.nfc.cardemulation {
 
   public final class CardEmulation {
-    method @FlaggedApi("android.permission.flags.wallet_role_enabled") @Nullable @RequiresPermission(android.Manifest.permission.NFC_PREFERRED_PAYMENT_INFO) public android.nfc.cardemulation.ApduServiceInfo getPreferredPaymentService();
+    method @FlaggedApi("android.permission.flags.wallet_role_enabled") @Nullable @RequiresPermission(android.Manifest.permission.NFC_PREFERRED_PAYMENT_INFO) public static android.content.ComponentName getPreferredPaymentService(@NonNull android.content.Context);
     method @FlaggedApi("android.nfc.enable_nfc_mainline") @NonNull public java.util.List<android.nfc.cardemulation.ApduServiceInfo> getServices(@NonNull String, int);
   }
 
diff --git a/nfc/java/android/nfc/cardemulation/CardEmulation.java b/nfc/java/android/nfc/cardemulation/CardEmulation.java
index 81eab71fe080..22320f254f46 100644
--- a/nfc/java/android/nfc/cardemulation/CardEmulation.java
+++ b/nfc/java/android/nfc/cardemulation/CardEmulation.java
@@ -16,6 +16,7 @@
 
 package android.nfc.cardemulation;
 
+import android.Manifest;
 import android.annotation.FlaggedApi;
 import android.annotation.NonNull;
 import android.annotation.Nullable;
@@ -23,6 +24,7 @@ import android.annotation.RequiresPermission;
 import android.annotation.SdkConstant;
 import android.annotation.SdkConstant.SdkConstantType;
 import android.annotation.SystemApi;
+import android.annotation.UserHandleAware;
 import android.annotation.UserIdInt;
 import android.app.Activity;
 import android.content.ComponentName;
@@ -1090,31 +1092,28 @@ public final class CardEmulation {
     }
 
     /**
-     * Returns the {@link Settings.Secure#NFC_PAYMENT_DEFAULT_COMPONENT} for the given user.
+     * Returns the value of {@link Settings.Secure#NFC_PAYMENT_DEFAULT_COMPONENT}.
+     *
+     * @param context A context
+     * @return A ComponentName for the setting value, or null.
      *
      * @hide
      */
     @SystemApi
+    @UserHandleAware
     @RequiresPermission(android.Manifest.permission.NFC_PREFERRED_PAYMENT_INFO)
+    @SuppressWarnings("AndroidFrameworkClientSidePermissionCheck")
     @FlaggedApi(android.permission.flags.Flags.FLAG_WALLET_ROLE_ENABLED)
     @Nullable
-    public ApduServiceInfo getPreferredPaymentService() {
-        try {
-            return sService.getPreferredPaymentService(mContext.getUser().getIdentifier());
-        } catch (RemoteException e) {
-            // Try one more time
-            recoverService();
-            if (sService == null) {
-                Log.e(TAG, "Failed to recover CardEmulationService.");
-                return null;
-            }
-            try {
-                return sService.getPreferredPaymentService(mContext.getUser().getIdentifier());
-            } catch (RemoteException ee) {
-                Log.e(TAG, "Failed to reach CardEmulationService.");
-                return null;
-            }
+    public static ComponentName getPreferredPaymentService(@NonNull Context context) {
+        context.checkCallingOrSelfPermission(Manifest.permission.NFC_PREFERRED_PAYMENT_INFO);
+        String defaultPaymentComponent = Settings.Secure.getString(context.getContentResolver(),
+                Constants.SETTINGS_SECURE_NFC_PAYMENT_DEFAULT_COMPONENT);
+
+        if (defaultPaymentComponent == null) {
+            return null;
         }
-    }
 
+        return ComponentName.unflattenFromString(defaultPaymentComponent);
+    }
 }