<!--下面2个是普通权限,只需要在清单文件里注册,不需要在程序里动态申请-->
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<!--搜索WiFi,需要定位权限,它是危险权限,在此声明外,还需要在程序里动态申请-->
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mScrollView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btn_check"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="检查WiFi" />
<Button
android:id="@+id/btn_open"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="打开WiFi" />
<Button
android:id="@+id/btn_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="关闭WiFi" />
<Button
android:id="@+id/btn_search"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="扫描WiFi" />
</LinearLayout>
<!--ScrollView是中间容器控件,当它包含的内容超过屏幕的容量时,会产生卷动效果-->
<ScrollView
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="wifi列表"
android:visibility="gone" />
</ScrollView>
</LinearLayout>
</LinearLayout>
/*
本程序演示了 WiFi操作
WiFi权限是普通权限,对应于WiFI的打开、关闭和状态读取。
WiFi扫描,需要定位权限,因此,除了在清单文件里注册外,还需要在程序里动态注册
*/
public class MainActivity extends AppCompatActivity implements OnClickListener{
WifiManager wifiManager;
WifiInfo wifiInfo;
ScanResult scanResult;
List<ScanResult> WifiList;
Button btn_check, btn_open, btn_close, btn_search;
TextView textView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //设定竖屏,不会切换成横屏
setContentView(R.layout.activity_main);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
}
fun();
}
private void fun() {
btn_check = findViewById(R.id.btn_check);btn_check.setOnClickListener(this);
btn_open = findViewById(R.id.btn_open);btn_open.setOnClickListener(this);
btn_close = findViewById(R.id.btn_close);btn_close.setOnClickListener(this);
btn_search = findViewById(R.id.btn_search);btn_search.setOnClickListener(this);
textView = findViewById(R.id.textView);
//创建WiFi管理器对象
wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
}
@Override
public void onClick(View v) { //内部接口View.OnClickListener要实现的方法
int ItemId = v.getId();//获取控件的id值
switch (ItemId) {
case R.id.btn_check:
textView.setVisibility(View.INVISIBLE); //隐藏先前扫描的结果
Toast.makeText(MainActivity.this, "当前WiFi状态为:" + getWiFiState(), Toast.LENGTH_LONG).show();
Log.i("wifiTest", "wifi state --->" + wifiManager.getWifiState());
break;
case R.id.btn_open:
textView.setVisibility(View.INVISIBLE);
wifiManager.setWifiEnabled(true); //打开WiFi
Toast.makeText(MainActivity.this, "当前WiFi状态为:" + getWiFiState(), Toast.LENGTH_LONG).show();
Log.i("wifiTest", "wifi state --->" + wifiManager.getWifiState());
break;
case R.id.btn_close:
textView.setVisibility(View.INVISIBLE);
wifiManager.setWifiEnabled(false); //关闭WiFi
//关闭WiFi存在延时,所以需要休眠,否则,出现逻辑错误
try {
Thread.sleep(1000); //主线程休眠1秒
} catch (InterruptedException e) {
e.printStackTrace();
}
Log.i("wifiTest", "wifi state --->" + wifiManager.getWifiState());
Toast.makeText(MainActivity.this, "当前WiFi状态为:" + getWiFiState(), Toast.LENGTH_LONG).show();
break;
case R.id.btn_search:
wifiManager.startScan();
WifiList = wifiManager.getScanResults();
wifiInfo = wifiManager.getConnectionInfo();
StringBuffer stringBuffer = new StringBuffer();
stringBuffer
.append("Wifi名").append(" ")
.append("Wifi地址").append(" ")
.append("Wifi频率").append(" ")
.append("Wifi信号\n");
if (WifiList != null) {
for (int i = 0; i < WifiList.size(); i++) {
scanResult = WifiList.get(i);
stringBuffer
.append(scanResult.SSID).append(" ")
.append(scanResult.BSSID).append(" ")
.append(scanResult.frequency).append(" ")
.append(scanResult.level).append("\n");
}
stringBuffer
.append("-----------------------------------------------\n")
.append("本机使用的WiFi的相关指标:\n")
.append("BSSID:").append(wifiInfo.getBSSID()).append("\n")
.append("Hidden SSID:").append(wifiInfo.getHiddenSSID()).append("\n")
.append("IP Address:").append(wifiInfo.getIpAddress()).append("\n")
.append("Link Speed:").append(wifiInfo.getLinkSpeed()).append("\n")
.append("MAC Address:").append(wifiInfo.getMacAddress()).append("\n")
.append("Network ID:").append(wifiInfo.getNetworkId()).append("\n")
.append("RSSI:").append(wifiInfo.getRssi()).append("\n")
.append("SSID:").append(wifiInfo.getSSID()).append("\n");
stringBuffer
.append("-----------------------------------------------\n")
.append("本机使用的WiFi的信息:\n")
.append(wifiInfo.toString());
textView.setVisibility(View.VISIBLE);
textView.setText(stringBuffer.toString());
}
}
}
public String getWiFiState(){ //获取WiFi状态
String temp=null;
switch (wifiManager.getWifiState()) {
case 0:
temp="Wifi正在关闭...";
break;
case 1:
temp="Wifi已经关闭";
break;
case 2:
temp="Wifi正在打开...";
break;
case 3:
temp="Wifi已经打开";
break;
default:
break;
}
return temp;
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length>0){
if(grantResults[0]!=PackageManager.PERMISSION_GRANTED){
Toast.makeText(this, "未授权,WiFi搜索功能将不可用!", Toast.LENGTH_SHORT).show();
}else{
fun();
}
}
}
}
<!--下面2个是普通权限,只需要在清单文件里注册,不需要在程序里动态申请-->
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
<uses-permission android:name="android.permission.BLUETOOTH" />
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">蓝牙Demo</string>
<string name="send">发送</string>
<string name="not_connected">你没有链接一个设备</string>
<string name="bt_not_enabled_leaving">蓝牙不可用,离开聊天室</string>
<string name="title_connecting">链接中...</string>
<string name="title_connected_to">连接到:</string>
<string name="title_not_connected">无链接</string>
<string name="scanning">蓝牙设备搜索中...</string>
<string name="select_device">选择一个好友链接</string>
<string name="none_paired">没有配对好友</string>
<string name="none_found">附近没有发现好友</string>
<string name="title_paired_devices">已配对好友</string>
<string name="title_other_devices">其它可连接好友</string>
<string name="button_scan">搜索好友</string>
<string name="connect">我的好友</string>
<string name="discoverable">设置在线</string>
<string name="back">退出</string>
<string name="startVideo">开始聊天</string>
<string name="stopVideo">结束聊天</string>
</resources>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/bg01">
<!--新版Android支持的Toolbar,对标题栏布局-->
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="@+id/title_left_text"
style="?android:attr/windowTitleStyle"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignParentLeft="true"
android:layout_weight="1"
android:gravity="left"
android:ellipsize="end"
android:singleLine="true" />
<TextView
android:id="@+id/title_right_text"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:ellipsize="end"
android:gravity="right"
android:singleLine="true"
android:textColor="#fff" />
</LinearLayout>
</android.support.v7.widget.Toolbar>
<ListView android:id="@+id/in"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:stackFromBottom="true"
android:transcriptMode="alwaysScroll"
android:layout_weight="1" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<EditText android:id="@+id/edit_text_out"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_gravity="bottom" />
<Button android:id="@+id/button_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/send"/>
</LinearLayout>
</LinearLayout>
/*
本程序ChatService是蓝牙会话的服务程序
定义了3个内部类:AcceptThread(接受新连接)、ConnectThread(发出连接)和ConnectedThread (已连接)
*/
public class ChatService {
//本应用的主Activity组件名称
private static final String NAME = "BluetoothChat";
// UUID:通用唯一识别码,是一个128位长的数字,一般用十六进制表示
//算法的核心思想是结合机器的网卡、当地时间、一个随机数来生成
//在创建蓝牙连接
private static final UUID MY_UUID = UUID.fromString("fa87c0d0-afac-11de-8a39-0800200c9a66");
private final BluetoothAdapter mAdapter;
private final Handler mHandler;
private AcceptThread mAcceptThread;
private ConnectThread mConnectThread;
private ConnectedThread mConnectedThread;
private int mState;
public static final int STATE_NONE = 0;
public static final int STATE_LISTEN = 1;
public static final int STATE_CONNECTING = 2;
public static final int STATE_CONNECTED = 3;
//构造方法,接收UI主线程传递的对象
public ChatService(Context context, Handler handler) {
//构造方法完成蓝牙对象的创建
mAdapter = BluetoothAdapter.getDefaultAdapter();
mState = STATE_NONE;
mHandler = handler;
}
private synchronized void setState(int state) {
mState = state;
mHandler.obtainMessage(BluetoothChat.MESSAGE_STATE_CHANGE, state, -1).sendToTarget();
}
public synchronized int getState() {
return mState;
}
public synchronized void start() {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mAcceptThread == null) {
mAcceptThread = new AcceptThread();
mAcceptThread.start();
}
setState(STATE_LISTEN);
}
//取消 CONNECTING 和 CONNECTED 状态下的相关线程,然后运行新的 mConnectThread 线程
public synchronized void connect(BluetoothDevice device) {
if (mState == STATE_CONNECTING) {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
mConnectThread = new ConnectThread(device);
mConnectThread.start();
setState(STATE_CONNECTING);
}
/*
开启一个 ConnectedThread 来管理对应的当前连接。之前先取消任意现存的 mConnectThread 、
mConnectedThread 、 mAcceptThread 线程,然后开启新 mConnectedThread ,传入当前刚刚接受的
socket 连接。最后通过 Handler来通知UI连接
*/
public synchronized void connected(BluetoothSocket socket, BluetoothDevice device) {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
mConnectedThread = new ConnectedThread(socket);
mConnectedThread.start();
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_DEVICE_NAME);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.DEVICE_NAME, device.getName());
msg.setData(bundle);
mHandler.sendMessage(msg);
setState(STATE_CONNECTED);
}
// 停止所有相关线程,设当前状态为 NONE
public synchronized void stop() {
if (mConnectThread != null) {
mConnectThread.cancel();
mConnectThread = null;
}
if (mConnectedThread != null) {
mConnectedThread.cancel();
mConnectedThread = null;
}
if (mAcceptThread != null) {
mAcceptThread.cancel();
mAcceptThread = null;
}
setState(STATE_NONE);
}
// 在 STATE_CONNECTED 状态下,调用 mConnectedThread 里的 write 方法,写入 byte
public void write(byte[] out) {
ConnectedThread r;
synchronized (this) {
if (mState != STATE_CONNECTED)
return;
r = mConnectedThread;
}
r.write(out);
}
// 连接失败的时候处理,通知 ui ,并设为 STATE_LISTEN 状态
private void connectionFailed() {
setState(STATE_LISTEN);
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.TOAST, "链接不到设备");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
// 当连接失去的时候,设为 STATE_LISTEN 状态并通知 ui
private void connectionLost() {
setState(STATE_LISTEN);
Message msg = mHandler.obtainMessage(BluetoothChat.MESSAGE_TOAST);
Bundle bundle = new Bundle();
bundle.putString(BluetoothChat.TOAST, "设备链接中断");
msg.setData(bundle);
mHandler.sendMessage(msg);
}
// 创建监听线程,准备接受新连接。使用阻塞方式,调用 BluetoothServerSocket.accept()
private class AcceptThread extends Thread {
private final BluetoothServerSocket mmServerSocket;
public AcceptThread() {
BluetoothServerSocket tmp = null;
try {
//使用射频端口(RF comm)监听
tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
} catch (IOException e) {
}
mmServerSocket = tmp;
}
@Override
public void run() {
setName("AcceptThread");
BluetoothSocket socket = null;
while (mState != STATE_CONNECTED) {
try {
socket = mmServerSocket.accept();
} catch (IOException e) {
break;
}
if (socket != null) {
synchronized (ChatService.this) {
switch (mState) {
case STATE_LISTEN:
case STATE_CONNECTING:
connected(socket, socket.getRemoteDevice());
break;
case STATE_NONE:
case STATE_CONNECTED:
try {
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
break;
}
}
}
}
}
public void cancel() {
try {
mmServerSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/*
连接线程,专门用来对外发出连接对方蓝牙的请求和处理流程。
构造函数里通过 BluetoothDevice.createRfcommSocketToServiceRecord() ,
从待连接的 device 产生 BluetoothSocket. 然后在 run 方法中 connect ,
成功后调用 BluetoothChatSevice 的 connected() 方法。定义 cancel() 在关闭线程时能够关闭相关socket 。
*/
private class ConnectThread extends Thread {
private final BluetoothSocket mmSocket;
private final BluetoothDevice mmDevice;
public ConnectThread(BluetoothDevice device) {
mmDevice = device;
BluetoothSocket tmp = null;
try {
tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
} catch (IOException e) {
e.printStackTrace();
}
mmSocket = tmp;
}
@Override
public void run() {
setName("ConnectThread");
mAdapter.cancelDiscovery();
try {
mmSocket.connect();
} catch (IOException e) {
connectionFailed();
try {
mmSocket.close();
} catch (IOException e2) {
e.printStackTrace();
}
ChatService.this.start();
return;
}
synchronized (ChatService.this) {
mConnectThread = null;
}
connected(mmSocket, mmDevice);
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/*
双方蓝牙连接后一直运行的线程;构造函数中设置输入输出流。
run()方法中使用阻塞模式的 InputStream.read()循环读取输入流,然后发送到 UI 线程中更新聊天消息。
本线程也提供了 write() 将聊天消息写入输出流传输至对方,传输成功后回写入 UI 线程。最后使用cancel()关闭连接的 socket
*/
private class ConnectedThread extends Thread {
private final BluetoothSocket mmSocket;
private final InputStream mmInStream;
private final OutputStream mmOutStream;
public ConnectedThread(BluetoothSocket socket) {
mmSocket = socket;
InputStream tmpIn = null;
OutputStream tmpOut = null;
try {
tmpIn = socket.getInputStream();
tmpOut = socket.getOutputStream();
} catch (IOException e) {
e.printStackTrace();
}
mmInStream = tmpIn;
mmOutStream = tmpOut;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
int bytes;
while (true) {
try {
bytes = mmInStream.read(buffer);
mHandler.obtainMessage(BluetoothChat.MESSAGE_READ, bytes, -1, buffer).sendToTarget();
} catch (IOException e) {
connectionLost();
break;
}
}
}
public void write(byte[] buffer) {
try {
mmOutStream.write(buffer);
mHandler.obtainMessage(BluetoothChat.MESSAGE_WRITE, -1, -1, buffer).sendToTarget();
} catch (IOException e) {
e.printStackTrace();
}
}
public void cancel() {
try {
mmSocket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
菜单文件option_menu.xml的代码如下:
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/scan"
android:icon="@android:drawable/ic_menu_myplaces"
android:title="@string/connect" />
<item android:id="@+id/discoverable"
android:icon="@android:drawable/ic_menu_view"
android:title="@string/discoverable" />
<item android:id="@+id/back"
android:icon="@android:drawable/ic_menu_close_clear_cancel"
android:title="@string/back" />
</menu>
选择好友界面的布局文件device_list.xml的代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView android:id="@+id/title_paired_devices"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/title_paired_devices"
android:visibility="gone"
android:background="#666"
android:textColor="#fff"
android:paddingLeft="5dp" />
<ListView android:id="@+id/paired_devices"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="1" />
<TextView android:id="@+id/title_new_devices"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/title_other_devices"
android:visibility="gone"
android:background="#666"
android:textColor="#fff"
android:paddingLeft="5dp" />
<!--android:visibility="gone"表示不占空间的隐藏,invisible是占空间-->
<ListView android:id="@+id/new_devices"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="2" />
<Button android:id="@+id/button_scan"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/button_scan" />
</LinearLayout>
/*
本程序供菜单项主界面的选项菜单“我的友好”调用,用于:
(1)显示已配对的好友列表;
(2)搜索可配对的好友进行配对
(3)新选择并配对的蓝牙设备将刷新好友列表
注意:发现新的蓝牙设备并请求配对时,需要对应接受
关键技术:动态注册一个广播接收者,处理蓝牙设备扫描的结果
*/
public class DeviceList extends AppCompatActivity{
private BluetoothAdapter mBtAdapter;
private ArrayAdapter<String> mPairedDevicesArrayAdapter;
private ArrayAdapter<String> mNewDevicesArrayAdapter;
public static String EXTRA_DEVICE_ADDRESS = "device_address"; //Mac地址
//定义广播接收者,用于处理扫描蓝牙设备后的结果
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
mNewDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
if (mNewDevicesArrayAdapter.getCount() == 0) {
String noDevices = getResources().getText(R.string.none_found).toString();
mNewDevicesArrayAdapter.add(noDevices);
}
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.device_list);
//在被调用活动里,设置返回结果码
setResult(Activity.RESULT_CANCELED);
init(); //活动界面
}
private void init() {
Button scanButton = findViewById(R.id.button_scan);
scanButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(DeviceList.this, R.string.scanning, Toast.LENGTH_LONG).show();
doDiscovery(); //搜索蓝牙设备
}
});
mPairedDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
mNewDevicesArrayAdapter = new ArrayAdapter<String>(this, R.layout.device_name);
//已配对蓝牙设备列表
ListView pairedListView =findViewById(R.id.paired_devices);
pairedListView.setAdapter(mPairedDevicesArrayAdapter);
pairedListView.setOnItemClickListener(mPaireDeviceClickListener);
//未配对蓝牙设备列表
ListView newDevicesListView = findViewById(R.id.new_devices);
newDevicesListView.setAdapter(mNewDevicesArrayAdapter);
newDevicesListView.setOnItemClickListener(mNewDeviceClickListener);
//动态注册广播接收者
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
registerReceiver(mReceiver, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
mBtAdapter = BluetoothAdapter.getDefaultAdapter();
Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();
if (pairedDevices.size() > 0) {
findViewById(R.id.title_paired_devices).setVisibility(View.VISIBLE);
for (BluetoothDevice device : pairedDevices) {
mPairedDevicesArrayAdapter.add(device.getName() + "\n" + device.getAddress());
}
} else {
String noDevices = getResources().getText(R.string.none_paired).toString();
mPairedDevicesArrayAdapter.add(noDevices);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mBtAdapter != null) {
mBtAdapter.cancelDiscovery();
}
this.unregisterReceiver(mReceiver);
}
private void doDiscovery() {
findViewById(R.id.title_new_devices).setVisibility(View.VISIBLE);
if (mBtAdapter.isDiscovering()) {
mBtAdapter.cancelDiscovery();
}
mBtAdapter.startDiscovery(); //开始搜索蓝牙设备并产生广播
//startDiscovery是一个异步方法
//找到一个设备时就发送一个BluetoothDevice.ACTION_FOUND的广播
}
private OnItemClickListener mPaireDeviceClickListener = new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
mBtAdapter.cancelDiscovery();
String info = ((TextView) v).getText().toString();
String address = info.substring(info.length() - 17);
Intent intent = new Intent();
intent.putExtra(EXTRA_DEVICE_ADDRESS, address); //Mac地址
setResult(Activity.RESULT_OK, intent);
finish();
}
};
private OnItemClickListener mNewDeviceClickListener = new OnItemClickListener() {
public void onItemClick(AdapterView<?> av, View v, int arg2, long arg3) {
mBtAdapter.cancelDiscovery();
Toast.makeText(DeviceList.this, "请在蓝牙设置界面手动连接设备",Toast.LENGTH_SHORT).show();
Intent intent = new Intent(Settings.ACTION_BLUETOOTH_SETTINGS);
startActivityForResult(intent,1);
}
};
//回调方法:进入蓝牙配对设置界面返回后执行
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
init(); //刷新好友列表
}
}
/*
本例演示了使用手机蓝牙实现会话功能
实验步骤:
(1)在两个手机分别安装、运行本应用。如果未打开手机蓝牙,则进入打开蓝牙设置界面;
(2)在OptionMenu(选项菜单)里,选择“我的好友”,即可直接连接,再进行会话;
(3)新建好友前,需要先使用选项菜单“设置在线”,即要求对方可见(能被扫描到)。
然后,单击“搜索好友”按钮。
*/
public class BluetoothChat extends AppCompatActivity{
public static final int MESSAGE_STATE_CHANGE = 1;
public static final int MESSAGE_READ = 2;
public static final int MESSAGE_WRITE = 3;
public static final int MESSAGE_DEVICE_NAME = 4;
public static final int MESSAGE_TOAST = 5;
public static final String DEVICE_NAME = "device_name";
public static final String TOAST = "toast";
private static final int REQUEST_CONNECT_DEVICE = 1; //请求连接设备
private static final int REQUEST_ENABLE_BT = 2;
private TextView mTitle;
private ListView mConversationView;
private EditText mOutEditText;
private Button mSendButton;
private String mConnectedDeviceName = null;
private ArrayAdapter<String> mConversationArrayAdapter;
private StringBuffer mOutStringBuffer;
private BluetoothAdapter mBluetoothAdapter = null;
private ChatService mChatService = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().hide(); //隐藏标题栏
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(this,Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 1);
}
}
Toolbar toolbar = findViewById(R.id.toolbar);
//创建选项菜单
toolbar.inflateMenu(R.menu.option_menu);
//选项菜单监听
toolbar.setOnMenuItemClickListener(new MyMenuItemClickListener());
mTitle = findViewById(R.id.title_left_text);
mTitle.setText(R.string.app_name);
mTitle = findViewById(R.id.title_right_text);
// 得到本地蓝牙适配器
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter == null) {
Toast.makeText(this, "蓝牙不可用", Toast.LENGTH_LONG).show();
finish();
return;
}
if (!mBluetoothAdapter.isEnabled()) { //若当前设备蓝牙功能未开启
Intent enableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableIntent, REQUEST_ENABLE_BT); //
} else {
if (mChatService == null) {
setupChat(); //创建会话
}
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if(grantResults.length>0){
if(grantResults[0]!=PackageManager.PERMISSION_GRANTED){
Toast.makeText(this, "未授权,蓝牙搜索功能将不可用!", Toast.LENGTH_SHORT).show();
}
}
}
@Override
public synchronized void onResume() { //synchronized:同步方法实现排队调用
super.onResume();
if (mChatService != null) {
if (mChatService.getState() == ChatService.STATE_NONE) {
mChatService.start();
}
}
}
private void setupChat() {
mConversationArrayAdapter = new ArrayAdapter<String>(this, R.layout.message);
mConversationView = findViewById(R.id.in);
mConversationView.setAdapter(mConversationArrayAdapter);
mOutEditText = findViewById(R.id.edit_text_out);
mOutEditText.setOnEditorActionListener(mWriteListener);
mSendButton = findViewById(R.id.button_send);
mSendButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
TextView view = findViewById(R.id.edit_text_out);
String message = view.getText().toString();
sendMessage(message);
}
});
//创建服务对象
mChatService = new ChatService(this, mHandler);
mOutStringBuffer = new StringBuffer("");
}
@Override
public void onDestroy() {
super.onDestroy();
if (mChatService != null)
mChatService.stop();
}
private void ensureDiscoverable() { //修改本机蓝牙设备的可见性
//打开手机蓝牙后,能被其它蓝牙设备扫描到的时间不是永久的
if (mBluetoothAdapter.getScanMode() != BluetoothAdapter.SCAN_MODE_CONNECTABLE_DISCOVERABLE) {
Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
//设置在300秒内可见(能被扫描)
discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
startActivity(discoverableIntent);
Toast.makeText(this, "已经设置本机蓝牙设备的可见性,对方可搜索了。", Toast.LENGTH_SHORT).show();
}
}
private void sendMessage(String message) {
if (mChatService.getState() != ChatService.STATE_CONNECTED) {
Toast.makeText(this, R.string.not_connected, Toast.LENGTH_SHORT).show();
return;
}
if (message.length() > 0) {
byte[] send = message.getBytes();
mChatService.write(send);
mOutStringBuffer.setLength(0);
mOutEditText.setText(mOutStringBuffer);
}
}
private TextView.OnEditorActionListener mWriteListener = new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView view, int actionId, KeyEvent event) {
if (actionId == EditorInfo.IME_NULL && event.getAction() == KeyEvent.ACTION_UP) {
//软键盘里的回车也能发送消息
String message = view.getText().toString();
sendMessage(message);
}
return true;
}
};
//使用Handler对象在UI主线程与子线程之间传递消息
private final Handler mHandler = new Handler() { //消息处理
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MESSAGE_STATE_CHANGE:
switch (msg.arg1) {
case ChatService.STATE_CONNECTED:
mTitle.setText(R.string.title_connected_to);
mTitle.append(mConnectedDeviceName);
mConversationArrayAdapter.clear();
break;
case ChatService.STATE_CONNECTING:
mTitle.setText(R.string.title_connecting);
break;
case ChatService.STATE_LISTEN:
case ChatService.STATE_NONE:
mTitle.setText(R.string.title_not_connected);
break;
}
break;
case MESSAGE_WRITE:
byte[] writeBuf = (byte[]) msg.obj;
String writeMessage = new String(writeBuf);
mConversationArrayAdapter.add("我: " + writeMessage);
break;
case MESSAGE_READ:
byte[] readBuf = (byte[]) msg.obj;
String readMessage = new String(readBuf, 0, msg.arg1);
mConversationArrayAdapter.add(mConnectedDeviceName + ": "
+ readMessage);
break;
case MESSAGE_DEVICE_NAME:
mConnectedDeviceName = msg.getData().getString(DEVICE_NAME);
Toast.makeText(getApplicationContext(),"链接到 " + mConnectedDeviceName, Toast.LENGTH_SHORT).show();
break;
case MESSAGE_TOAST:
Toast.makeText(getApplicationContext(),
msg.getData().getString(TOAST), Toast.LENGTH_SHORT).show();
break;
}
}
};
//返回进入好友列表操作后的数回调方法
public void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_CONNECT_DEVICE:
if (resultCode == Activity.RESULT_OK) {
String address = data.getExtras().getString(DeviceList.EXTRA_DEVICE_ADDRESS);
BluetoothDevice device = mBluetoothAdapter.getRemoteDevice(address);
mChatService.connect(device);
}else if(resultCode==Activity.RESULT_CANCELED){
Toast.makeText(this, "未选择任何好友!", Toast.LENGTH_SHORT).show();
}
break;
case REQUEST_ENABLE_BT:
if (resultCode == Activity.RESULT_OK) {
setupChat();
} else {
Toast.makeText(this, R.string.bt_not_enabled_leaving, Toast.LENGTH_SHORT).show();
finish();
}
}
}
//内部类,选项菜单的单击事件处理
private class MyMenuItemClickListener implements Toolbar.OnMenuItemClickListener {
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()) {
case R.id.scan:
//启动DeviceList这个Activity
Intent serverIntent = new Intent(BluetoothChat.this, DeviceList.class);
startActivityForResult(serverIntent, REQUEST_CONNECT_DEVICE);
return true;
case R.id.discoverable:
ensureDiscoverable();
return true;
case R.id.back:
finish();
System.exit(0);
return true;
}
return false;
}
}
}
NFC读写模块的运行界面
<uses-permission android:name="android.permission.NFC" />
<!--从Google应用商店下载安装NFC应用时,没有NFC功能的手机将不被安装-->
<uses-feature
android:name="android.hardware.nfc"
android:required="true" />
/*
本活动用于读出Tag标签里的内容:非接触式,NFC线圈靠近芯片卡的中央
如果读取其它已经加密卡,程序会闪退
*/
public class ReadTag extends AppCompatActivity {
private NfcAdapter nfcAdapter;
private TextView resultText;
private PendingIntent pendingIntent;
private IntentFilter[] mFilters;
private String[][] mTechLists;
private Button mJumpTagBtn;
private boolean isFirst = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// 获取NFC适配器,判断设备是否支持NFC功能
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (nfcAdapter == null) {
////提示文本在资源文件res/values/strings.xml里,R.string.no_nfc是文本资源的id值
Toast.makeText(this, getResources().getString(R.string.no_nfc), Toast.LENGTH_SHORT).show();
finish();
return;
} else if (!nfcAdapter.isEnabled()) {
//NFC未打开时
Toast.makeText(this, getResources().getString(R.string.open_nfc), Toast.LENGTH_SHORT).show();
finish();
return;
}
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //设定竖屏 setContentView(R.layout.read_tag); //进入ReadTag活动,在清单文件里配置作为主活动
resultText = findViewById(R.id.resultText); // 显示结果Text
mJumpTagBtn = findViewById(R.id.jump); // 写入标签按钮
mJumpTagBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.jump:
Intent intent = new Intent(ReadTag.this, WriteTag.class);
startActivity(intent); //调用WiteTag这个Activity
default:
break;
}
}
});
/*
创建一个PendingIntent对象,在扫描到NFC标签时,用它来封装NFC标签的详细信息。
Intent.FLAG_ACTIVITY_SINGLE_TOP:如果当前栈顶的activity就是要启动的activity,则不会再启动一个新的activity
*/
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this,getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
//使用IntentFilter过滤想要的action
IntentFilter ndef = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
ndef.addCategory("*/*");
mFilters = new IntentFilter[] { ndef }; //过滤器
mTechLists = new String[][] {
//如果android设备支持MIFARE,提供对MIFARE Classic目标的属性和I/O操作
new String[] { MifareClassic.class.getName() },
new String[] { NfcA.class.getName() } }; // 允许扫描的标签类型
}
//重写Activity组件的onNewIntent()方法(不是生命周期方法)来获取扫描到的NFC标签的数据
@Override
protected void onNewIntent(Intent intent) { //配合延期意图使用
super.onNewIntent(intent);
/*当系统检测到TAG标签中含有NDEF格式的数据时,且系统中有Activity声明可以接受包含NDEF数据的Intent的时候,系统会优先发出这个action的intent*/
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
String result = processIntent(intent);
resultText.setText(result);
}
}
@Override
protected void onResume() { //Activity组件的生命周期方法,配合延期意图使用
super.onResume();
nfcAdapter.enableForegroundDispatch(this, pendingIntent, mFilters,mTechLists);
if (isFirst) {
if (NfcAdapter.ACTION_TECH_DISCOVERED.equals(getIntent().getAction())) {
String result = processIntent(getIntent());
resultText.setText(result);
}
isFirst = false;
}
}
//获取标签中的内容
private String processIntent(Intent intent) {
String resultStr=getResources().getString(R.string.message);
try {
Parcelable[] rawmsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage msg = (NdefMessage) rawmsgs[0];
NdefRecord[] records = msg.getRecords();
resultStr = new String(records[0].getPayload());
}catch (Exception e){
Toast.makeText(this, "无法识别的卡!", Toast.LENGTH_SHORT).show();
}
return resultStr;
}
}
//本Activity组件WriteTag供本Activity组件ReadTag调用
public class WriteTag extends AppCompatActivity {
private IntentFilter[] mWriteTagFilters;
private NfcAdapter nfcAdapter;
PendingIntent pendingIntent;
String[][] mTechLists;
Button writeBtn;
boolean isWrite = false;
EditText mContentEditText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); //设定竖屏
setContentView(R.layout.write_tag);
writeBtn = findViewById(R.id.writeBtn);
writeBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
isWrite = true;
AlertDialog.Builder builder = new AlertDialog.Builder(WriteTag.this).setTitle("请将标签靠近!");
builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
mContentEditText.setText("");
isWrite = false;
WriteTag.this.finish();
}
});
builder.setPositiveButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
isWrite = false;
}
});
builder.create();
builder.show();
}
});
mContentEditText = findViewById(R.id.content_edit);
nfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (nfcAdapter == null) {
Toast.makeText(this, getResources().getString(R.string.no_nfc), Toast.LENGTH_SHORT).show();
finish();
return;
} else if (!nfcAdapter.isEnabled()) {
Toast.makeText(this, getResources().getString(R.string.open_nfc),
Toast.LENGTH_SHORT).show();
finish();
return;
}
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter writeFilter = new IntentFilter(NfcAdapter.ACTION_TECH_DISCOVERED);
mWriteTagFilters = new IntentFilter[] { writeFilter };
mTechLists = new String[][] {
new String[] { MifareClassic.class.getName() },
new String[] { NfcA.class.getName() } };// 允许扫描的标签类型
}
//重写Activity组件的onNewIntent()方法(不是生命周期方法)来获取扫描到的NFC标签的数据
@Override
protected void onNewIntent(Intent intent) { //配合延期意图使用
super.onNewIntent(intent);
if (isWrite == true && NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())) {
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
NdefMessage ndefMessage = getNoteAsNdef();
if (ndefMessage != null) {
writeTag(getNoteAsNdef(), tag);
} else {
showToast("请输入您要写入标签的内容");
}
}
}
@Override
protected void onResume() { //Activity组件的生命周期方法,配合延期意图使用
super.onResume();
nfcAdapter.enableForegroundDispatch(this, pendingIntent,mWriteTagFilters, mTechLists);
}
// 根据文本生成一个NdefRecord
private NdefMessage getNoteAsNdef() {
String text = mContentEditText.getText().toString();
if (text.equals("")) {
return null;
} else {
byte[] textBytes = text.getBytes();
NdefRecord textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,"image/jpeg".getBytes(), new byte[] {}, textBytes);
return new NdefMessage(new NdefRecord[] { textRecord });
}
}
// 写入Tag标签
boolean writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
showToast("Tag不允许写入");
return false;
}
if (ndef.getMaxSize() < size) {
showToast("文件大小超出容量");
return false;
}
ndef.writeNdefMessage(message);
showToast("写入数据成功.");
return true;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
showToast("格式化并且写入message");
return true;
} catch (IOException e) {
showToast("无法识别的卡!");
return false;
}
} else {
showToast("Tag不支持NDEF");
return false;
}
}
} catch (Exception e) {
showToast("写入数据失败");
}
return false;
}
private void showToast(String text) {
Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
}
}