connectivity/nfc/CardReader/CardReaderSample/src/main/java/com/example/android/cardreader/CardReaderFragment.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.example.android.cardreader;

import android.app.Activity;
import android.nfc.NfcAdapter;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

import com.example.android.common.logger.Log;

/**
 * Generic UI for sample discovery.
 */
public class CardReaderFragment extends Fragment implements LoyaltyCardReader.AccountCallback {

    public static final String TAG = "CardReaderFragment";
    // Recommend NfcAdapter flags for reading from other Android devices. Indicates that this
    // activity is interested in NFC-A devices (including other Android devices), and that the
    // system should not check for the presence of NDEF-formatted data (e.g. Android Beam).
    public static int READER_FLAGS =
            NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_SKIP_NDEF_CHECK;
    public LoyaltyCardReader mLoyaltyCardReader;
    private TextView mAccountField;

    /** Called when sample is created. Displays generic UI with welcome text. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.main_fragment, container, false);
        if (v != null) {
            mAccountField = (TextView) v.findViewById(R.id.card_account_field);
            mAccountField.setText("Waiting...");

            mLoyaltyCardReader = new LoyaltyCardReader(this);

            // Disable Android Beam and register our card reader callback
            enableReaderMode();
        }

        return v;
    }

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

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

    private void enableReaderMode() {
        Log.i(TAG, "Enabling reader mode");
        Activity activity = getActivity();
        NfcAdapter nfc = NfcAdapter.getDefaultAdapter(activity);
        if (nfc != null) {
            nfc.enableReaderMode(activity, mLoyaltyCardReader, READER_FLAGS, null);
        }
    }

    private void disableReaderMode() {
        Log.i(TAG, "Disabling reader mode");
        Activity activity = getActivity();
        NfcAdapter nfc = NfcAdapter.getDefaultAdapter(activity);
        if (nfc != null) {
            nfc.disableReaderMode(activity);
        }
    }

    @Override
    public void onAccountReceived(final String account) {
        // This callback is run on a background thread, but updates to UI elements must be performed
        // on the UI thread.
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                mAccountField.setText(account);
            }
        });
    }
}