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

/*
 * Copyright (C) 2013 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.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.support.v7.preference.PreferenceManager;
import android.support.v7.preference.PreferenceScreen;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import com.android.internal.logging.MetricsProto.MetricsEvent;
import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.dashboard.SummaryLoader;
import com.android.settings.nfc.PaymentBackend.PaymentAppInfo;

import java.util.List;

public class PaymentSettings extends SettingsPreferenceFragment {
    public static final String TAG = "PaymentSettings";
    private PaymentBackend mPaymentBackend;

    @Override
    protected int getMetricsCategory() {
        return MetricsEvent.NFC_PAYMENT;
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        mPaymentBackend = new PaymentBackend(getActivity());
        setHasOptionsMenu(true);

        PreferenceManager manager = getPreferenceManager();
        PreferenceScreen screen = manager.createPreferenceScreen(getActivity());

        List<PaymentBackend.PaymentAppInfo> appInfos = mPaymentBackend.getPaymentAppInfos();
        if (appInfos != null && appInfos.size() > 0) {
            NfcPaymentPreference preference =
                    new NfcPaymentPreference(getPrefContext(), mPaymentBackend);
            preference.setKey("payment");
            screen.addPreference(preference);
            NfcForegroundPreference foreground = new NfcForegroundPreference(getPrefContext(),
                    mPaymentBackend);
            screen.addPreference(foreground);
        }
        setPreferenceScreen(screen);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        ViewGroup contentRoot = (ViewGroup) getListView().getParent();
        View emptyView = getActivity().getLayoutInflater().inflate(
                R.layout.nfc_payment_empty, contentRoot, false);
        contentRoot.addView(emptyView);
        setEmptyView(emptyView);
    }

    @Override
    public void onResume() {
        super.onResume();
        mPaymentBackend.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mPaymentBackend.onPause();
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        super.onCreateOptionsMenu(menu, inflater);
        MenuItem menuItem = menu.add(R.string.nfc_payment_how_it_works);
        Intent howItWorksIntent = new Intent(getActivity(), HowItWorks.class);
        menuItem.setIntent(howItWorksIntent);
        menuItem.setShowAsActionFlags(MenuItem.SHOW_AS_ACTION_NEVER);
    }

    private static class SummaryProvider implements SummaryLoader.SummaryProvider {

        private final Context mContext;
        private final SummaryLoader mSummaryLoader;

        public SummaryProvider(Context context, SummaryLoader summaryLoader) {
            mContext = context;
            mSummaryLoader = summaryLoader;
        }

        @Override
        public void setListening(boolean listening) {
            if (listening && NfcAdapter.getDefaultAdapter(mContext) != null) {
                PaymentBackend paymentBackend = new PaymentBackend(mContext);
                paymentBackend.refresh();
                PaymentAppInfo app = paymentBackend.getDefaultApp();
                String summary = null;
                if (app != null) {
                    summary = mContext.getString(R.string.payment_summary, app.label);
                }
                mSummaryLoader.setSummary(this, summary);
            }
        }
    }

    public static final SummaryLoader.SummaryProviderFactory SUMMARY_PROVIDER_FACTORY
            = new SummaryLoader.SummaryProviderFactory() {
        @Override
        public SummaryLoader.SummaryProvider createSummaryProvider(Activity activity,
                                                                   SummaryLoader summaryLoader) {
            return new SummaryProvider(activity, summaryLoader);
        }
    };
}