Java tutorial
/* * 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.example.android.naradaoffline; import android.app.ActionBar; import android.app.Activity; import android.app.AlertDialog; import android.bluetooth.BluetoothAdapter; import android.bluetooth.BluetoothDevice; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.text.InputType; import android.util.Base64; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.view.inputmethod.EditorInfo; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.TextView; import android.widget.Toast; import com.google.gson.Gson; import com.example.android.common.logger.Log; import java.util.ArrayList; /** * This fragment controls Bluetooth to communicate with other devices. */ public class DatagramFragment extends Fragment { private static final String TAG = "DatagramFragment"; private final Gson gson = new Gson(); // Intent request codes private static final int REQUEST_CONNECT_DEVICE_SECURE = 1; private static final int REQUEST_CONNECT_DEVICE_INSECURE = 2; private static final int REQUEST_ENABLE_BT = 3; private String mText = ""; private String mEmail = ""; // Layout Views private ListView mConversationView; private EditText mOutEditText; private ImageButton mGetNewsPaper; private ImageButton mGetEmail; private ImageButton mWhatsapp; private ImageButton mSendEmail; private ImageButton mGetAlert; public Context cont; //Datagram Enums public enum DatagramRequestType { GET_NEWSPAPER, GET_NEW_EMAILS, SEND_WHATSAPP_MSG, SEND_EMAIL, GET_ALERTS } public enum DatagramResponseType { GET_NEWSPAPER, GET_NEW_EMAILS, SEND_WHATSAPP_MSG, SEND_EMAIL, GET_ALERTS } public enum DatagramError { BAD_REQUEST, RECIPIENT_NO_EXIST, SENDER_REFUSED } private class DatagramResponse { DatagramResponseType type; String mDeviceName; String mRequest; //newspaper data String mNewspaperHtml; public DatagramResponse(DatagramResponseType type, String newspaperHtml, String deviceName) { this.type = type; mDeviceName = deviceName; mNewspaperHtml = Base64.encodeToString(newspaperHtml.getBytes(), Base64.NO_WRAP); } //EMAIL TYPE DATAGRAM // public DatagramResponse(DatagramRequestType type, String deviceName, String from, String to, String body) { // this.type = type; // this.mDeviceName = deviceName; // mEmailFrom = from; // mEmailTo = to; // mEmailBody = body; // } public String readNewspaperHtml() { return new String(Base64.decode(mNewspaperHtml, Base64.NO_WRAP)); } } private class DatagramRequest { DatagramRequestType type; String mDeviceName; String mRequest; //email data String mEmailFrom; String mEmailTo; String mEmailBody; public DatagramRequest(DatagramRequestType type, String deviceName) { this.type = type; mDeviceName = deviceName; } //EMAIL TYPE DATAGRAM public DatagramRequest(DatagramRequestType type, String deviceName, String from, String to, String body) { this.type = type; this.mDeviceName = deviceName; mEmailFrom = from; mEmailTo = to; mEmailBody = body; } } /** * Name of the connected device */ private String mConnectedDeviceName = null; private ArrayList<DatagramRequest> mDatagramRequests = new ArrayList<DatagramRequest>(); /** * Array adapter for the conversation thread */ private ArrayAdapter<String> mConversationArrayAdapter; /** * String buffer for outgoing messages */ private StringBuffer mOutStringBuffer; /** * Local Bluetooth adapter */ private BluetoothAdapter mBluetoothAdapter = null; /** * Member object for the chat services */ private BluetoothDatagramService mChatService = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setHasOptionsMenu(true); // Get local Bluetooth adapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter(); // If the adapter is null, then Bluetooth is not supported if (mBluetoothAdapter == null) { FragmentActivity activity = getActivity(); Toast.makeText(activity, "Bluetooth is not available", Toast.LENGTH_LONG).show(); activity.finish(); } } @Override public void onStart() { super.onStart(); // If BT is not on, request that it be enabled. // setupChat() will then be called during onActivityResult if (!mBluetoothAdapter.isEnabled()) { Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableIntent, REQUEST_ENABLE_BT); // Otherwise, setup the chat session } else if (mChatService == null) { setupChat(); } } @Override public void onDestroy() { super.onDestroy(); if (mChatService != null) { mChatService.stop(); } } @Override public void onResume() { super.onResume(); // Performing this check in onResume() covers the case in which BT was // not enabled during onStart(), so we were paused to enable it... // onResume() will be called when ACTION_REQUEST_ENABLE activity returns. if (mChatService != null) { // Only if the state is STATE_NONE, do we know that we haven't started already if (mChatService.getState() == BluetoothDatagramService.STATE_NONE) { // Start the Bluetooth chat services mChatService.start(); } } } @Override public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { return inflater.inflate(R.layout.fragment_bluetooth_chat, container, false); } @Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) { //mConversationView = (ListView) view.findViewById(R.id.in); mGetNewsPaper = (ImageButton) view.findViewById(R.id.button_news); mGetEmail = (ImageButton) view.findViewById(R.id.button_email); mWhatsapp = (ImageButton) view.findViewById(R.id.button_whatsapp); mSendEmail = (ImageButton) view.findViewById(R.id.button_email3); mGetAlert = (ImageButton) view.findViewById(R.id.button_alert); } protected final void sendEmail(DatagramRequest data) { if (data.type != DatagramRequestType.SEND_EMAIL) { Log.w(TAG, "This datagram is actually of type " + data.type.name()); } Log.i("Send email", ""); String[] TO = { data.mEmailTo }; Intent emailIntent = new Intent(Intent.ACTION_SEND); emailIntent.setData(Uri.parse("mailto:")); emailIntent.setType("text/plain"); emailIntent.putExtra(Intent.EXTRA_EMAIL, TO); emailIntent.putExtra(Intent.EXTRA_SUBJECT, "Your Datagram"); emailIntent.putExtra(Intent.EXTRA_TEXT, data.mEmailBody); try { startActivity(Intent.createChooser(emailIntent, "Send mail...")); Log.i("Finished sending email...", ""); } catch (android.content.ActivityNotFoundException ex) { // Toast.makeText(MainActivity.this, // "There is no email client installed.", Toast.LENGTH_SHORT).show(); } } /** * Set up the UI and background operations for chat. */ private void setupChat() { Log.d(TAG); // Initialize the array adapter for the conversation thread mConversationArrayAdapter = new ArrayAdapter<String>(getActivity(), R.layout.message); //mConversationView.setAdapter(mConversationArrayAdapter); // Initialize the compose field with a listener for the return key // mOutEditText.setOnEditorActionListener(mWriteListener); // Initialize the send button with a listener that for click events mGetNewsPaper.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // Send a message using content of the edit text widget View view = getView(); if (null != view) { // TextView textView = (TextView) view.findViewById(R.id.edit_text_out); DatagramRequest d = new DatagramRequest(DatagramRequestType.GET_NEWSPAPER, mConnectedDeviceName); sendDatagramRequest(d); } } }); // Initialize the send button with a listener that for click events mGetEmail.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // Send a message using content of the edit text widget View view = getView(); if (null != view) { // TextView textView = (TextView) view.findViewById(R.id.edit_text_out); Log.i(TAG, "button clicked"); AlertDialog.Builder builder = new AlertDialog.Builder(DatagramFragment.this.getContext()); builder.setTitle("Write your email here"); LinearLayout layout = new LinearLayout(getContext()); layout.setOrientation(LinearLayout.VERTICAL); // Set up the input final EditText email = new EditText(DatagramFragment.this.getContext()); email.setHint("Recipient e-mail address"); // Specify the type of input expected; this, for example, sets the input as a password, and will mask the text email.setInputType(InputType.TYPE_TEXT_VARIATION_EMAIL_ADDRESS); layout.addView(email); final EditText input = new EditText(DatagramFragment.this.getContext()); // Specify the type of input expected; this, for example, sets the input as a password, and will mask the text input.setHint("Type your e-mail here"); input.setInputType(InputType.TYPE_CLASS_TEXT); layout.addView(input); builder.setView(layout); // Set up the buttons builder.setPositiveButton("OK", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { mEmail = email.getText().toString(); mText = input.getText().toString(); DatagramRequest d = new DatagramRequest(DatagramRequestType.SEND_EMAIL, mConnectedDeviceName, "", mEmail, mText); sendDatagramRequest(d); } }); builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); builder.show(); } } }); // Initialize the BluetoothDatagramService to perform bluetooth connections mChatService = new BluetoothDatagramService(getActivity(), mHandler); // Initialize the buffer for outgoing messages mOutStringBuffer = new StringBuffer(""); } /** * Makes this device discoverable. */ private void ensureDiscoverable() { if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) { Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300); startActivity(discoverableIntent); } } /** * Sends a message. * * @param message A string of text to send. */ /** * Sends a message. * */ private void sendDatagramRequest(DatagramRequest request) { // Check that we're actually connected before trying anything if (mChatService.getState() != BluetoothDatagramService.STATE_CONNECTED) { Toast.makeText(getActivity(), R.string.not_connected, Toast.LENGTH_SHORT).show(); return; } Log.i(TAG, "sending datagram"); byte[] send = gson.toJson(request).getBytes(); mChatService.write(send); // Check that there's actually something to send // if (message.length() > 0) { // // Get the message bytes and tell the BluetoothDatagramService to write // byte[] send = message.getBytes(); // mChatService.write(send); // // // Reset out string buffer to zero and clear the edit text field // mOutStringBuffer.setLength(0); // mOutEditText.setText(mOutStringBuffer); // } } /** * Updates the status on the action bar. * * @param resId a string resource ID */ private void setStatus(int resId) { FragmentActivity activity = getActivity(); if (null == activity) { return; } final ActionBar actionBar = activity.getActionBar(); if (null == actionBar) { return; } actionBar.setSubtitle(resId); } /** * Updates the status on the action bar. * * @param subTitle status */ private void setStatus(CharSequence subTitle) { FragmentActivity activity = getActivity(); if (null == activity) { return; } final ActionBar actionBar = activity.getActionBar(); if (null == actionBar) { return; } actionBar.setSubtitle(subTitle); } /** * The Handler that gets information back from the BluetoothDatagramService */ private final Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) { FragmentActivity activity = getActivity(); switch (msg.what) { case Constants.MESSAGE_STATE_CHANGE: switch (msg.arg1) { case BluetoothDatagramService.STATE_CONNECTED: setStatus(getString(R.string.title_connected_to, mConnectedDeviceName)); mConversationArrayAdapter.clear(); break; case BluetoothDatagramService.STATE_CONNECTING: setStatus(R.string.title_connecting); break; case BluetoothDatagramService.STATE_LISTEN: case BluetoothDatagramService.STATE_NONE: setStatus(R.string.title_not_connected); break; } break; case Constants.MESSAGE_WRITE: byte[] writeBuf = (byte[]) msg.obj; // construct a string from the buffer String writeMessage = new String(writeBuf); mConversationArrayAdapter.add("Me: " + writeMessage); break; case Constants.MESSAGE_READ: byte[] readBuf = (byte[]) msg.obj; // construct a string from the valid bytes in the buffer String readMessage = new String(readBuf, 0, msg.arg1); Log.i(TAG, "Message is: " + readMessage.length()); DatagramRequest req = gson.fromJson(readMessage, DatagramRequest.class); if (req.type == DatagramRequestType.SEND_EMAIL) sendEmail(req); mConversationArrayAdapter.add(mConnectedDeviceName + ": " + readMessage); break; case Constants.MESSAGE_DEVICE_NAME: // save the connected device's name mConnectedDeviceName = msg.getData().getString(Constants.DEVICE_NAME); if (null != activity) { Toast.makeText(activity, "Connected to " + mConnectedDeviceName, Toast.LENGTH_SHORT).show(); } break; case Constants.MESSAGE_TOAST: if (null != activity) { Toast.makeText(activity, msg.getData().getString(Constants.TOAST), Toast.LENGTH_SHORT).show(); } break; } } }; public void onActivityResult(int requestCode, int resultCode, Intent data) { switch (requestCode) { case REQUEST_CONNECT_DEVICE_SECURE: // When DeviceListActivity returns with a device to connect if (resultCode == Activity.RESULT_OK) { connectDevice(data, true); } break; case REQUEST_CONNECT_DEVICE_INSECURE: // When DeviceListActivity returns with a device to connect if (resultCode == Activity.RESULT_OK) { connectDevice(data, false); } break; case REQUEST_ENABLE_BT: // When the request to enable Bluetooth returns if (resultCode == Activity.RESULT_OK) { // Bluetooth is now enabled, so set up a chat session setupChat(); } else { // User did not enable Bluetooth or an error occurred Log.d(TAG); Toast.makeText(getActivity(), R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show(); getActivity().finish(); } } } /** * Establish connection with other divice * * @param data An {@link Intent} with {@link DeviceListActivity#EXTRA_DEVICE_ADDRESS} extra. * @param secure Socket Security type - Secure (true) , Insecure (false) */ private void connectDevice(Intent data, boolean secure) { // Get the device MAC address String address = data.getExtras().getString(DeviceListActivity.EXTRA_DEVICE_ADDRESS); // Get the BluetoothDevice object BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address); // Attempt to connect to the device mChatService.connect(device, secure); } @Override public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { inflater.inflate(R.menu.bluetooth_chat, menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case R.id.secure_connect_scan: { // Launch the DeviceListActivity to see devices and do scan Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_SECURE); return true; } case R.id.insecure_connect_scan: { // Launch the DeviceListActivity to see devices and do scan Intent serverIntent = new Intent(getActivity(), DeviceListActivity.class); startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE_INSECURE); return true; } case R.id.discoverable: { // Ensure this device is discoverable by others ensureDiscoverable(); return true; } } return false; } }