New UX for the NFC default payment settings

Re-design the UX.

Bug: 202367033
Test: maunal
      make RunSettingsRoboTests ROBOTEST_FILTER=NfcForegroundPreferenceControllerTest
      make RunSettingsRoboTests ROBOTEST_FILTER=PaymentSettingsTest
Change-Id: I4c05ac4a1974645c76a37900d64aa8e1a491bca1

src/com/android/settings/nfc/NfcDefaultPaymentPreferenceController.java

@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.nfc;
+
+import android.content.Context;
+import android.content.pm.PackageManager;
+import android.graphics.drawable.Drawable;
+import android.nfc.NfcAdapter;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+
+import com.android.settings.applications.defaultapps.DefaultAppPreferenceController;
+import com.android.settings.nfc.PaymentBackend.PaymentAppInfo;
+import com.android.settingslib.applications.DefaultAppInfo;
+import com.android.settingslib.core.lifecycle.Lifecycle;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnPause;
+import com.android.settingslib.core.lifecycle.events.OnResume;
+
+import java.util.List;
+
+/**
+ * NfcDefaultPaymentPreferenceController shows an app icon and text summary for current selected
+ * default payment, and links to the nfc default payment selection page.
+ */
+public class NfcDefaultPaymentPreferenceController extends DefaultAppPreferenceController implements
+        PaymentBackend.Callback, LifecycleObserver, OnResume, OnPause {
+
+    private static final String TAG = "NfcDefaultPaymentController";
+    private static final String KEY = "nfc_payment_app";
+
+    private PaymentBackend mPaymentBackend;
+    private Preference mPreference;
+    private Context mContext;
+
+    public NfcDefaultPaymentPreferenceController(Context context, Lifecycle lifecycle) {
+        super(context);
+        mContext = context;
+        mPaymentBackend = new PaymentBackend(context);
+        if (lifecycle != null) {
+            lifecycle.addObserver(this);
+        }
+    }
+
+    @Override
+    public boolean isAvailable() {
+        final PackageManager pm = mContext.getPackageManager();
+        if (!pm.hasSystemFeature(PackageManager.FEATURE_NFC)) {
+            return false;
+        }
+        if (NfcAdapter.getDefaultAdapter(mContext) == null) {
+            return false;
+        }
+        if (mPaymentBackend == null) {
+            mPaymentBackend = new PaymentBackend(mContext);
+        }
+        final List<PaymentAppInfo> appInfos = mPaymentBackend.getPaymentAppInfos();
+        return (appInfos != null && !appInfos.isEmpty())
+                ? true
+                : false;
+    }
+
+    @Override
+    public String getPreferenceKey() {
+        return KEY;
+    }
+
+    @Override
+    public void onResume() {
+        if (mPaymentBackend != null) {
+            mPaymentBackend.registerCallback(this);
+            mPaymentBackend.onResume();
+        }
+    }
+
+    @Override
+    public void onPause() {
+        if (mPaymentBackend != null) {
+            mPaymentBackend.unregisterCallback(this);
+            mPaymentBackend.onPause();
+        }
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        mPreference = screen.findPreference(getPreferenceKey());
+        super.displayPreference(screen);
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        preference.setIconSpaceReserved(true);
+    }
+
+    @Override
+    public void onPaymentAppsChanged() {
+        updateState(mPreference);
+    }
+
+    /**
+     * PaymentDefaultAppInfo is used to store the default payment app info.
+     */
+    public static class PaymentDefaultAppInfo extends DefaultAppInfo {
+        public PaymentAppInfo mInfo;
+
+        public PaymentDefaultAppInfo(Context context, PackageManager pm, int userId,
+                PaymentAppInfo info) {
+            super(context, pm, userId, info.componentName);
+            mInfo = info;
+        }
+
+        @Override
+        public Drawable loadIcon() {
+            return mInfo.icon;
+        }
+    }
+
+    @Override
+    protected DefaultAppInfo getDefaultAppInfo() {
+        if (mPaymentBackend == null) {
+            return null;
+        }
+        final PaymentAppInfo defaultApp = mPaymentBackend.getDefaultApp();
+        if (defaultApp != null) {
+            return new PaymentDefaultAppInfo(mContext, mPackageManager,
+                    defaultApp.userHandle.getIdentifier(), defaultApp);
+        }
+        return null;
+    }
+}