src/com/android/settings/wifi/WriteWifiConfigToNfcDialog.java - platform/packages/apps/Settings - Git at Google

 /*
  * Copyright (C) 2014 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.wifi;

 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.net.wifi.WifiManager;
 import android.nfc.FormatException;
 import android.nfc.NdefMessage;
 import android.nfc.NdefRecord;
 import android.nfc.NfcAdapter;
 import android.nfc.Tag;
 import android.nfc.tech.Ndef;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.PowerManager;
 import android.text.Editable;
 import android.text.InputType;
 import android.text.TextWatcher;
 import android.util.Log;
 import android.view.View;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.ProgressBar;
 import android.widget.TextView;

 import com.android.settings.R;
 import com.android.settingslib.wifi.AccessPoint;

 import java.io.IOException;

 class WriteWifiConfigToNfcDialog extends AlertDialog
         implements TextWatcher, View.OnClickListener, CompoundButton.OnCheckedChangeListener {

     private static final String NFC_TOKEN_MIME_TYPE = "application/vnd.wfa.wsc";

     private static final String TAG = WriteWifiConfigToNfcDialog.class.getName().toString();
     private static final String PASSWORD_FORMAT = "102700%s%s";
     private static final int HEX_RADIX = 16;
     private static final char[] hexArray = "0123456789ABCDEF".toCharArray();
     private static final String NETWORK_ID = "network_id";
     private static final String SECURITY = "security";

     private final PowerManager.WakeLock mWakeLock;

     private View mView;
     private Button mSubmitButton;
     private Button mCancelButton;
     private Handler mOnTextChangedHandler;
     private TextView mPasswordView;
     private TextView mLabelView;
     private CheckBox mPasswordCheckBox;
     private ProgressBar mProgressBar;
     private WifiManager mWifiManager;
     private String mWpsNfcConfigurationToken;
     private Context mContext;
     private int mNetworkId;
     private int mSecurity;

     WriteWifiConfigToNfcDialog(Context context, int networkId, int security,
             WifiManager wifiManager) {
         super(context);

         mContext = context;
         mWakeLock = ((PowerManager) context.getSystemService(Context.POWER_SERVICE))
                 .newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WriteWifiConfigToNfcDialog:wakeLock");
         mOnTextChangedHandler = new Handler();
         mNetworkId = networkId;
         mSecurity = security;
         mWifiManager = wifiManager;
     }

     WriteWifiConfigToNfcDialog(Context context, Bundle savedState, WifiManager wifiManager) {
         super(context);

         mContext = context;
         mWakeLock = ((PowerManager) context.getSystemService(Context.POWER_SERVICE))
                 .newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WriteWifiConfigToNfcDialog:wakeLock");
         mOnTextChangedHandler = new Handler();
         mNetworkId = savedState.getInt(NETWORK_ID);
         mSecurity = savedState.getInt(SECURITY);
         mWifiManager = wifiManager;
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         mView = getLayoutInflater().inflate(R.layout.write_wifi_config_to_nfc, null);

         setView(mView);
         setInverseBackgroundForced(true);
         setTitle(R.string.setup_wifi_nfc_tag);
         setCancelable(true);
         setButton(DialogInterface.BUTTON_NEUTRAL,
                 mContext.getResources().getString(R.string.write_tag), (OnClickListener) null);
         setButton(DialogInterface.BUTTON_NEGATIVE,
                 mContext.getResources().getString(com.android.internal.R.string.cancel),
                 (OnClickListener) null);

         mPasswordView = (TextView) mView.findViewById(R.id.password);
         mLabelView = (TextView) mView.findViewById(R.id.password_label);
         mPasswordView.addTextChangedListener(this);
         mPasswordCheckBox = (CheckBox) mView.findViewById(R.id.show_password);
         mPasswordCheckBox.setOnCheckedChangeListener(this);
         mProgressBar = (ProgressBar) mView.findViewById(R.id.progress_bar);

         super.onCreate(savedInstanceState);

         mSubmitButton = getButton(DialogInterface.BUTTON_NEUTRAL);
         mSubmitButton.setOnClickListener(this);
         mSubmitButton.setEnabled(false);

         mCancelButton = getButton(DialogInterface.BUTTON_NEGATIVE);
     }

     @Override
     public void onClick(View v) {
         mWakeLock.acquire();

         String password = mPasswordView.getText().toString();
         String wpsNfcConfigurationToken
                 = mWifiManager.getWpsNfcConfigurationToken(mNetworkId);
         String passwordHex = byteArrayToHexString(password.getBytes());

         String passwordLength = password.length() >= HEX_RADIX
                 ? Integer.toString(password.length(), HEX_RADIX)
                 : "0" + Character.forDigit(password.length(), HEX_RADIX);

         passwordHex = String.format(PASSWORD_FORMAT, passwordLength, passwordHex).toUpperCase();

         if (wpsNfcConfigurationToken.contains(passwordHex)) {
             mWpsNfcConfigurationToken = wpsNfcConfigurationToken;

             Activity activity = getOwnerActivity();
             NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(activity);

             nfcAdapter.enableReaderMode(activity, new NfcAdapter.ReaderCallback() {
                 @Override
                 public void onTagDiscovered(Tag tag) {
                     handleWriteNfcEvent(tag);
                 }
             }, NfcAdapter.FLAG_READER_NFC_A |
                     NfcAdapter.FLAG_READER_NFC_B |
                     NfcAdapter.FLAG_READER_NFC_BARCODE |
                     NfcAdapter.FLAG_READER_NFC_F |
                     NfcAdapter.FLAG_READER_NFC_V,
                     null);

             mPasswordView.setVisibility(View.GONE);
             mPasswordCheckBox.setVisibility(View.GONE);
             mSubmitButton.setVisibility(View.GONE);
             InputMethodManager imm = (InputMethodManager)
                     getOwnerActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
             imm.hideSoftInputFromWindow(mPasswordView.getWindowToken(), 0);

             mLabelView.setText(R.string.status_awaiting_tap);

             mView.findViewById(R.id.password_layout).setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
             mProgressBar.setVisibility(View.VISIBLE);
         } else {
             mLabelView.setText(R.string.status_invalid_password);
         }
     }

     public void saveState(Bundle state) {
         state.putInt(NETWORK_ID, mNetworkId);
         state.putInt(SECURITY, mSecurity);
     }

     private void handleWriteNfcEvent(Tag tag) {
         Ndef ndef = Ndef.get(tag);

         if (ndef != null) {
             if (ndef.isWritable()) {
                 NdefRecord record = NdefRecord.createMime(
                         NFC_TOKEN_MIME_TYPE,
                         hexStringToByteArray(mWpsNfcConfigurationToken));
                 try {
                     ndef.connect();
                     ndef.writeNdefMessage(new NdefMessage(record));
                     getOwnerActivity().runOnUiThread(new Runnable() {
                         @Override
                         public void run() {
                             mProgressBar.setVisibility(View.GONE);
                         }
                     });
                     setViewText(mLabelView, R.string.status_write_success);
                     setViewText(mCancelButton, com.android.internal.R.string.done_label);
                 } catch (IOException e) {
                     setViewText(mLabelView, R.string.status_failed_to_write);
                     Log.e(TAG, "Unable to write Wi-Fi config to NFC tag.", e);
                     return;
                 } catch (FormatException e) {
                     setViewText(mLabelView, R.string.status_failed_to_write);
                     Log.e(TAG, "Unable to write Wi-Fi config to NFC tag.", e);
                     return;
                 }
             } else {
                 setViewText(mLabelView, R.string.status_tag_not_writable);
                 Log.e(TAG, "Tag is not writable");
             }
         } else {
             setViewText(mLabelView, R.string.status_tag_not_writable);
             Log.e(TAG, "Tag does not support NDEF");
         }
     }

     @Override
     public void dismiss() {
         if (mWakeLock.isHeld()) {
             mWakeLock.release();
         }

         super.dismiss();
     }

     @Override
     public void onTextChanged(CharSequence s, int start, int before, int count) {
         mOnTextChangedHandler.post(new Runnable() {
             @Override
             public void run() {
                 enableSubmitIfAppropriate();
             }
         });
     }

     private void enableSubmitIfAppropriate() {

         if (mPasswordView != null) {
             if (mSecurity == AccessPoint.SECURITY_WEP) {
                 mSubmitButton.setEnabled(mPasswordView.length() > 0);
             } else if (mSecurity == AccessPoint.SECURITY_PSK) {
                 mSubmitButton.setEnabled(mPasswordView.length() >= 8);
             }
         } else {
             mSubmitButton.setEnabled(false);
         }

     }

     private void setViewText(final TextView view, final int resid) {
         getOwnerActivity().runOnUiThread(new Runnable() {
             @Override
             public void run() {
                 view.setText(resid);
             }
         });
     }

     @Override
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
         mPasswordView.setInputType(
                 InputType.TYPE_CLASS_TEXT |
                 (isChecked
                         ? InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
                         : InputType.TYPE_TEXT_VARIATION_PASSWORD));
     }

     private static byte[] hexStringToByteArray(String s) {
         int len = s.length();
         byte[] data = new byte[len / 2];

         for (int i = 0; i < len; i += 2) {
             data[i / 2] = (byte) ((Character.digit(s.charAt(i), HEX_RADIX) << 4)
                     + Character.digit(s.charAt(i + 1), HEX_RADIX));
         }

         return data;
     }

     private static String byteArrayToHexString(byte[] bytes) {
         char[] hexChars = new char[bytes.length * 2];
         for ( int j = 0; j < bytes.length; j++ ) {
             int v = bytes[j] & 0xFF;
             hexChars[j * 2] = hexArray[v >>> 4];
             hexChars[j * 2 + 1] = hexArray[v & 0x0F];
         }
         return new String(hexChars);
     }

     @Override
     public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

     @Override
     public void afterTextChanged(Editable s) {}
 }
	/*
	* Copyright (C) 2014 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.wifi;

	import android.app.Activity;
	import android.app.AlertDialog;
	import android.content.Context;
	import android.content.DialogInterface;
	import android.net.wifi.WifiManager;
	import android.nfc.FormatException;
	import android.nfc.NdefMessage;
	import android.nfc.NdefRecord;
	import android.nfc.NfcAdapter;
	import android.nfc.Tag;
	import android.nfc.tech.Ndef;
	import android.os.Bundle;
	import android.os.Handler;
	import android.os.PowerManager;
	import android.text.Editable;
	import android.text.InputType;
	import android.text.TextWatcher;
	import android.util.Log;
	import android.view.View;
	import android.view.inputmethod.InputMethodManager;
	import android.widget.Button;
	import android.widget.CheckBox;
	import android.widget.CompoundButton;
	import android.widget.ProgressBar;
	import android.widget.TextView;

	import com.android.settings.R;
	import com.android.settingslib.wifi.AccessPoint;

	import java.io.IOException;

	class WriteWifiConfigToNfcDialog extends AlertDialog
	implements TextWatcher, View.OnClickListener, CompoundButton.OnCheckedChangeListener {

	private static final String NFC_TOKEN_MIME_TYPE = "application/vnd.wfa.wsc";

	private static final String TAG = WriteWifiConfigToNfcDialog.class.getName().toString();
	private static final String PASSWORD_FORMAT = "102700%s%s";
	private static final int HEX_RADIX = 16;
	private static final char[] hexArray = "0123456789ABCDEF".toCharArray();
	private static final String NETWORK_ID = "network_id";
	private static final String SECURITY = "security";

	private final PowerManager.WakeLock mWakeLock;

	private View mView;
	private Button mSubmitButton;
	private Button mCancelButton;
	private Handler mOnTextChangedHandler;
	private TextView mPasswordView;
	private TextView mLabelView;
	private CheckBox mPasswordCheckBox;
	private ProgressBar mProgressBar;
	private WifiManager mWifiManager;
	private String mWpsNfcConfigurationToken;
	private Context mContext;
	private int mNetworkId;
	private int mSecurity;

	WriteWifiConfigToNfcDialog(Context context, int networkId, int security,
	WifiManager wifiManager) {
	super(context);

	mContext = context;
	mWakeLock = ((PowerManager) context.getSystemService(Context.POWER_SERVICE))
	.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WriteWifiConfigToNfcDialog:wakeLock");
	mOnTextChangedHandler = new Handler();
	mNetworkId = networkId;
	mSecurity = security;
	mWifiManager = wifiManager;
	}

	WriteWifiConfigToNfcDialog(Context context, Bundle savedState, WifiManager wifiManager) {
	super(context);

	mContext = context;
	mWakeLock = ((PowerManager) context.getSystemService(Context.POWER_SERVICE))
	.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "WriteWifiConfigToNfcDialog:wakeLock");
	mOnTextChangedHandler = new Handler();
	mNetworkId = savedState.getInt(NETWORK_ID);
	mSecurity = savedState.getInt(SECURITY);
	mWifiManager = wifiManager;
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	mView = getLayoutInflater().inflate(R.layout.write_wifi_config_to_nfc, null);

	setView(mView);
	setInverseBackgroundForced(true);
	setTitle(R.string.setup_wifi_nfc_tag);
	setCancelable(true);
	setButton(DialogInterface.BUTTON_NEUTRAL,
	mContext.getResources().getString(R.string.write_tag), (OnClickListener) null);
	setButton(DialogInterface.BUTTON_NEGATIVE,
	mContext.getResources().getString(com.android.internal.R.string.cancel),
	(OnClickListener) null);

	mPasswordView = (TextView) mView.findViewById(R.id.password);
	mLabelView = (TextView) mView.findViewById(R.id.password_label);
	mPasswordView.addTextChangedListener(this);
	mPasswordCheckBox = (CheckBox) mView.findViewById(R.id.show_password);
	mPasswordCheckBox.setOnCheckedChangeListener(this);
	mProgressBar = (ProgressBar) mView.findViewById(R.id.progress_bar);

	super.onCreate(savedInstanceState);

	mSubmitButton = getButton(DialogInterface.BUTTON_NEUTRAL);
	mSubmitButton.setOnClickListener(this);
	mSubmitButton.setEnabled(false);

	mCancelButton = getButton(DialogInterface.BUTTON_NEGATIVE);
	}

	@Override
	public void onClick(View v) {
	mWakeLock.acquire();

	String password = mPasswordView.getText().toString();
	String wpsNfcConfigurationToken
	= mWifiManager.getWpsNfcConfigurationToken(mNetworkId);
	String passwordHex = byteArrayToHexString(password.getBytes());

	String passwordLength = password.length() >= HEX_RADIX
	? Integer.toString(password.length(), HEX_RADIX)
	: "0" + Character.forDigit(password.length(), HEX_RADIX);

	passwordHex = String.format(PASSWORD_FORMAT, passwordLength, passwordHex).toUpperCase();

	if (wpsNfcConfigurationToken.contains(passwordHex)) {
	mWpsNfcConfigurationToken = wpsNfcConfigurationToken;

	Activity activity = getOwnerActivity();
	NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(activity);

	nfcAdapter.enableReaderMode(activity, new NfcAdapter.ReaderCallback() {
	@Override
	public void onTagDiscovered(Tag tag) {
	handleWriteNfcEvent(tag);
	}
	}, NfcAdapter.FLAG_READER_NFC_A \|
	NfcAdapter.FLAG_READER_NFC_B \|
	NfcAdapter.FLAG_READER_NFC_BARCODE \|
	NfcAdapter.FLAG_READER_NFC_F \|
	NfcAdapter.FLAG_READER_NFC_V,
	null);

	mPasswordView.setVisibility(View.GONE);
	mPasswordCheckBox.setVisibility(View.GONE);
	mSubmitButton.setVisibility(View.GONE);
	InputMethodManager imm = (InputMethodManager)
	getOwnerActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
	imm.hideSoftInputFromWindow(mPasswordView.getWindowToken(), 0);

	mLabelView.setText(R.string.status_awaiting_tap);

	mView.findViewById(R.id.password_layout).setTextAlignment(View.TEXT_ALIGNMENT_CENTER);
	mProgressBar.setVisibility(View.VISIBLE);
	} else {
	mLabelView.setText(R.string.status_invalid_password);
	}
	}

	public void saveState(Bundle state) {
	state.putInt(NETWORK_ID, mNetworkId);
	state.putInt(SECURITY, mSecurity);
	}

	private void handleWriteNfcEvent(Tag tag) {
	Ndef ndef = Ndef.get(tag);

	if (ndef != null) {
	if (ndef.isWritable()) {
	NdefRecord record = NdefRecord.createMime(
	NFC_TOKEN_MIME_TYPE,
	hexStringToByteArray(mWpsNfcConfigurationToken));
	try {
	ndef.connect();
	ndef.writeNdefMessage(new NdefMessage(record));
	getOwnerActivity().runOnUiThread(new Runnable() {
	@Override
	public void run() {
	mProgressBar.setVisibility(View.GONE);
	}
	});
	setViewText(mLabelView, R.string.status_write_success);
	setViewText(mCancelButton, com.android.internal.R.string.done_label);
	} catch (IOException e) {
	setViewText(mLabelView, R.string.status_failed_to_write);
	Log.e(TAG, "Unable to write Wi-Fi config to NFC tag.", e);
	return;
	} catch (FormatException e) {
	setViewText(mLabelView, R.string.status_failed_to_write);
	Log.e(TAG, "Unable to write Wi-Fi config to NFC tag.", e);
	return;
	}
	} else {
	setViewText(mLabelView, R.string.status_tag_not_writable);
	Log.e(TAG, "Tag is not writable");
	}
	} else {
	setViewText(mLabelView, R.string.status_tag_not_writable);
	Log.e(TAG, "Tag does not support NDEF");
	}
	}

	@Override
	public void dismiss() {
	if (mWakeLock.isHeld()) {
	mWakeLock.release();
	}

	super.dismiss();
	}

	@Override
	public void onTextChanged(CharSequence s, int start, int before, int count) {
	mOnTextChangedHandler.post(new Runnable() {
	@Override
	public void run() {
	enableSubmitIfAppropriate();
	}
	});
	}

	private void enableSubmitIfAppropriate() {

	if (mPasswordView != null) {
	if (mSecurity == AccessPoint.SECURITY_WEP) {
	mSubmitButton.setEnabled(mPasswordView.length() > 0);
	} else if (mSecurity == AccessPoint.SECURITY_PSK) {
	mSubmitButton.setEnabled(mPasswordView.length() >= 8);
	}
	} else {
	mSubmitButton.setEnabled(false);
	}

	}

	private void setViewText(final TextView view, final int resid) {
	getOwnerActivity().runOnUiThread(new Runnable() {
	@Override
	public void run() {
	view.setText(resid);
	}
	});
	}

	@Override
	public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
	mPasswordView.setInputType(
	InputType.TYPE_CLASS_TEXT \|
	(isChecked
	? InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD
	: InputType.TYPE_TEXT_VARIATION_PASSWORD));
	}

	private static byte[] hexStringToByteArray(String s) {
	int len = s.length();
	byte[] data = new byte[len / 2];

	for (int i = 0; i < len; i += 2) {
	data[i / 2] = (byte) ((Character.digit(s.charAt(i), HEX_RADIX) << 4)
	+ Character.digit(s.charAt(i + 1), HEX_RADIX));
	}

	return data;
	}

	private static String byteArrayToHexString(byte[] bytes) {
	char[] hexChars = new char[bytes.length * 2];
	for ( int j = 0; j < bytes.length; j++ ) {
	int v = bytes[j] & 0xFF;
	hexChars[j * 2] = hexArray[v >>> 4];
	hexChars[j * 2 + 1] = hexArray[v & 0x0F];
	}
	return new String(hexChars);
	}

	@Override
	public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

	@Override
	public void afterTextChanged(Editable s) {}
	}