Java tutorial
/* * Copyright (c) 2010-2016, openHAB.org and others. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html */ package org.openhab.habdroid.ui; import android.app.PendingIntent; import android.content.Context; import android.content.Intent; import android.graphics.PorterDuff; import android.graphics.drawable.Drawable; import android.nfc.FormatException; import android.nfc.NdefMessage; import android.nfc.NdefRecord; import android.nfc.NfcAdapter; import android.nfc.NfcManager; import android.nfc.Tag; import android.nfc.tech.Ndef; import android.nfc.tech.NdefFormatable; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.provider.Settings; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.content.ContextCompat; import android.support.v7.app.AppCompatActivity; import android.support.v7.widget.Toolbar; import android.text.TextUtils; import android.util.Log; import android.view.LayoutInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.ImageView; import android.widget.TextView; import org.openhab.habdroid.R; import org.openhab.habdroid.util.Util; import java.io.IOException; import java.net.URI; import java.net.URISyntaxException; public class OpenHABWriteTagActivity extends AppCompatActivity { private static final String TAG = OpenHABWriteTagActivity.class.getSimpleName(); private NfcAdapter mNfcAdapter; private String mSitemapPage; private String mItem; private String mCommand; @Override protected void onCreate(Bundle savedInstanceState) { Util.setActivityTheme(this); super.onCreate(savedInstanceState); setContentView(R.layout.openhabwritetag); Toolbar toolbar = findViewById(R.id.openhab_toolbar); setSupportActionBar(toolbar); getSupportActionBar().setDisplayHomeAsUpEnabled(true); NfcManager manager = (NfcManager) getSystemService(Context.NFC_SERVICE); mNfcAdapter = manager.getDefaultAdapter(); if (savedInstanceState == null) { getSupportFragmentManager().beginTransaction().add(R.id.writenfc_container, getFragment()).commit(); } setResult(RESULT_OK); mSitemapPage = getIntent().getStringExtra("sitemapPage"); Log.d(TAG, "Got sitemapPage = " + mSitemapPage); mItem = getIntent().getStringExtra("item"); Log.d(TAG, "Got item = " + mItem); mCommand = getIntent().getStringExtra("command"); Log.d(TAG, "Got command = " + mCommand); } private Fragment getFragment() { if (mNfcAdapter == null) { return new NFCUnsupportedFragment(); } else if (!mNfcAdapter.isEnabled()) { return new NFCDisabledFragment(); } else { return new NFCWriteTagFragment(); } } @Override public boolean onOptionsItemSelected(MenuItem item) { if (item.getItemId() == android.R.id.home) { finish(); return true; } return super.onOptionsItemSelected(item); } @Override public void onResume() { Log.d(TAG, "onResume()"); super.onResume(); if (mNfcAdapter != null) { Intent intent = new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0); mNfcAdapter.enableForegroundDispatch(this, pendingIntent, null, null); } getSupportFragmentManager().beginTransaction().replace(R.id.writenfc_container, getFragment()).commit(); } @Override public void onPause() { Log.d(TAG, "onPause()"); super.onPause(); if (mNfcAdapter != null) { mNfcAdapter.disableForegroundDispatch(this); } } @Override public void onNewIntent(Intent intent) { if (mSitemapPage == null) { return; } Tag tagFromIntent = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG); //do something with tagFromIntent Log.d(TAG, "NFC TAG = " + tagFromIntent.toString()); Log.d(TAG, "Writing page " + mSitemapPage + " to tag"); TextView writeTagMessage = findViewById(R.id.write_tag_message); try { URI sitemapURI = new URI(mSitemapPage); if (!sitemapURI.getPath().startsWith("/rest/sitemaps")) { throw new URISyntaxException(mSitemapPage, "Expected a sitemap URL"); } StringBuilder uriToWrite = new StringBuilder("openhab://sitemaps"); uriToWrite.append(sitemapURI.getPath().substring(14)); if (!TextUtils.isEmpty(mItem) && !TextUtils.isEmpty(mCommand)) { uriToWrite.append("?item=").append(mItem).append("&command=").append(mCommand); } writeTagMessage.setText(R.string.info_write_tag_progress); writeTag(tagFromIntent, uriToWrite.toString()); } catch (URISyntaxException e) { Log.e(TAG, e.getMessage()); writeTagMessage.setText(R.string.info_write_failed); } } private void writeTag(Tag tag, String uri) { Log.d(TAG, "Creating tag object for URI " + uri); TextView writeTagMessage = findViewById(R.id.write_tag_message); NdefRecord[] ndefRecords = new NdefRecord[] { NdefRecord.createUri(uri) }; NdefMessage message = new NdefMessage(ndefRecords); NdefFormatable ndefFormatable = NdefFormatable.get(tag); if (ndefFormatable != null) { Log.d(TAG, "Tag is uninitialized, formating"); try { ndefFormatable.connect(); ndefFormatable.format(message); ndefFormatable.close(); writeTagMessage.setText(R.string.info_write_tag_finished); autoCloseActivity(); } catch (IOException | FormatException e) { Log.e(TAG, "Writing to unformatted tag failed: " + e); writeTagMessage.setText(R.string.info_write_failed); } } else { Log.d(TAG, "Tag is initialized, writing"); Ndef ndef = Ndef.get(tag); if (ndef != null) { try { Log.d(TAG, "Connecting"); ndef.connect(); Log.d(TAG, "Writing"); if (ndef.isWritable()) { ndef.writeNdefMessage(message); } Log.d(TAG, "Closing"); ndef.close(); writeTagMessage.setText(R.string.info_write_tag_finished); autoCloseActivity(); } catch (IOException | FormatException e) { Log.e(TAG, "Writing to formatted tag failed: " + e); writeTagMessage.setText(R.string.info_write_failed); } } else { Log.e(TAG, "Ndef == null"); writeTagMessage.setText(R.string.info_write_failed); } } } @Override public void finish() { super.finish(); Util.overridePendingTransition(this, true); } private void autoCloseActivity() { new Handler().postDelayed(() -> finish(), 2000); } public static abstract class AbstractNFCFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { final View view = inflater.inflate(R.layout.fragment_writenfc, container, false); final ImageView watermark = view.findViewById(R.id.nfc_watermark); Drawable ic_nfc = getResources().getDrawable(R.drawable.ic_nfc_black_180dp); ic_nfc.setColorFilter(ContextCompat.getColor(getActivity(), R.color.empty_list_text_color), PorterDuff.Mode.SRC_IN); watermark.setImageDrawable(ic_nfc); return view; } protected TextView getMessageTextView(View view) { return view.findViewById(R.id.write_tag_message); } } public static class NFCUnsupportedFragment extends AbstractNFCFragment { @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = super.onCreateView(inflater, container, savedInstanceState); getMessageTextView(view).setText(R.string.info_write_tag_unsupported); return view; } } public static class NFCDisabledFragment extends AbstractNFCFragment { @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = super.onCreateView(inflater, container, savedInstanceState); getMessageTextView(view).setText(R.string.info_write_tag_disabled); TextView nfcActivate = view.findViewById(R.id.nfc_activate); nfcActivate.setVisibility(View.VISIBLE); nfcActivate.setOnClickListener(v -> { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) { startActivity(new Intent(Settings.ACTION_NFC_SETTINGS)); } else { startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS)); } }); return view; } } public static class NFCWriteTagFragment extends AbstractNFCFragment { @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = super.onCreateView(inflater, container, savedInstanceState); view.findViewById(R.id.nfc_wait_progress).setVisibility(View.VISIBLE); return view; } } }