HCE foreground support.

Allow users to configure they want to favor the foreground
app for tap&pay.
Change-Id: I25e1058e84f468e47fd40f43b65389c04373a3ab

res/layout/nfc_payment_option.xml

@@ -19,7 +19,7 @@
     android:layout_weight="1"
     android:id="@+id/nfc_payment_pref"
     android:focusable="true"
-    android:clickable="true"
+    android:clickable="false"
     android:gravity="center_vertical"
     android:paddingTop="10dp"
     android:paddingBottom="10dp"
@@ -37,6 +37,7 @@
             android:layout_width="wrap_content"
             android:layout_height="96dp"
             android:scaleType="centerInside"
+            android:clickable="true"
                 />
     </FrameLayout>
     <RadioButton
@@ -46,6 +47,6 @@
         android:layout_alignParentEnd="true"
         android:layout_centerVertical="true"
         android:duplicateParentState="true"
-        android:clickable="false"
+        android:clickable="true"
         android:focusable="false" />
 </RelativeLayout>

res/values/strings.xml

@@ -4957,6 +4957,9 @@
     <string name="nfc_payment_settings_title">Tap &amp; pay</string>
     <!-- String shown when there are no NFC payment applications installed -->
     <string name="nfc_payment_no_apps">Pay with just a tap</string>
+    <!-- String shown before a checkbox, allowing the user to indicate that he wants foreground apps
+         to be able to override the configured default app -->
+    <string name="nfc_payment_favor_foreground">Favor foreground app</string>
     <!-- String shown when there are no NFC payment applications installed, clickable, pointing to
          a website to learn more-->
     <string name="nfc_payment_learn_more">Learn more</string>

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

@@ -24,6 +24,7 @@ import android.nfc.NfcAdapter;
 import android.nfc.cardemulation.ApduServiceInfo;
 import android.nfc.cardemulation.CardEmulation;
 import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -74,6 +75,20 @@ public class PaymentBackend {
         return appInfos;
     }
 
+    boolean isForegroundMode() {
+        try {
+            return Settings.Secure.getInt(mContext.getContentResolver(),
+                    Settings.Secure.NFC_PAYMENT_FOREGROUND) != 0;
+        } catch (SettingNotFoundException e) {
+            return false;
+        }
+    }
+
+    void setForegroundMode(boolean foreground) {
+        Settings.Secure.putInt(mContext.getContentResolver(),
+                Settings.Secure.NFC_PAYMENT_FOREGROUND, foreground ? 1 : 0) ;
+    }
+
     ComponentName getDefaultPaymentApp() {
         String componentString = Settings.Secure.getString(mContext.getContentResolver(),
                 Settings.Secure.NFC_PAYMENT_DEFAULT_COMPONENT);

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

@@ -19,14 +19,7 @@ package com.android.settings.nfc;
 import android.content.ComponentName;
 import android.content.DialogInterface;
 import android.content.Intent;
-import android.content.pm.ApplicationInfo;
-import android.content.pm.PackageManager;
-import android.content.pm.ResolveInfo;
-import android.content.pm.PackageManager.NameNotFoundException;
-import android.nfc.cardemulation.ApduServiceInfo;
 import android.nfc.cardemulation.CardEmulation;
-import android.nfc.cardemulation.HostApduService;
-import android.nfc.cardemulation.OffHostApduService;
 import android.os.Bundle;
 import android.util.Log;
 
@@ -35,11 +28,8 @@ import com.android.internal.app.AlertController;
 import com.android.settings.R;
 import com.android.settings.nfc.PaymentBackend.PaymentAppInfo;
 
-import java.io.IOException;
 import java.util.List;
 
-import org.xmlpull.v1.XmlPullParserException;
-
 public final class PaymentDefaultDialog extends AlertActivity implements
         DialogInterface.OnClickListener {
 

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

@@ -22,7 +22,9 @@ import android.net.Uri;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Message;
+import android.preference.CheckBoxPreference;
 import android.preference.Preference;
+import android.preference.Preference.OnPreferenceChangeListener;
 import android.preference.PreferenceManager;
 import android.preference.PreferenceScreen;
 import android.provider.Settings;
@@ -48,7 +50,7 @@ import com.android.settings.nfc.PaymentBackend.PaymentAppInfo;
 import java.util.List;
 
 public class PaymentSettings extends SettingsPreferenceFragment implements
-        OnClickListener {
+        OnClickListener, OnPreferenceChangeListener {
     public static final String TAG = "PaymentSettings";
     private LayoutInflater mInflater;
     private PaymentBackend mPaymentBackend;
@@ -67,6 +69,7 @@ public class PaymentSettings extends SettingsPreferenceFragment implements
     public void refresh() {
         PreferenceManager manager = getPreferenceManager();
         PreferenceScreen screen = manager.createPreferenceScreen(getActivity());
+
         // Get all payment services
         List<PaymentAppInfo> appInfos = mPaymentBackend.getPaymentAppInfos();
         if (appInfos != null && appInfos.size() > 0) {
@@ -92,6 +95,13 @@ public class PaymentSettings extends SettingsPreferenceFragment implements
             emptyImage.setVisibility(View.VISIBLE);
             getListView().setVisibility(View.GONE);
         } else {
+            CheckBoxPreference foreground = new CheckBoxPreference(getActivity());
+            boolean foregroundMode = mPaymentBackend.isForegroundMode();
+            foreground.setPersistent(false);
+            foreground.setTitle(getString(R.string.nfc_payment_favor_foreground));
+            foreground.setChecked(foregroundMode);
+            foreground.setOnPreferenceChangeListener(this);
+            screen.addPreference(foreground);
             emptyText.setVisibility(View.GONE);
             learnMore.setVisibility(View.GONE);
             emptyImage.setVisibility(View.GONE);
@@ -207,14 +217,25 @@ public class PaymentSettings extends SettingsPreferenceFragment implements
         protected void onBindView(View view) {
             super.onBindView(view);
 
-            view.setOnClickListener(listener);
-            view.setTag(appInfo);
-
             RadioButton radioButton = (RadioButton) view.findViewById(android.R.id.button1);
             radioButton.setChecked(appInfo.isDefault);
+            radioButton.setOnClickListener(listener);
+            radioButton.setTag(appInfo);
 
             ImageView banner = (ImageView) view.findViewById(R.id.banner);
             banner.setImageDrawable(appInfo.banner);
+            banner.setOnClickListener(listener);
+            banner.setTag(appInfo);
+        }
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        if (preference instanceof CheckBoxPreference) {
+            mPaymentBackend.setForegroundMode(((Boolean) newValue).booleanValue());
+            return true;
+        } else {
+            return false;
         }
     }
 }