1. 首先 构造一个打印的业务类
public class PrintBean {
public static final int PRINT_TYPE =1664;
//蓝牙-名称
public Stringname;
//蓝牙-地址
public Stringaddress;
//蓝牙-设备类型
public int type;
//蓝牙-是否已经匹配
public boolean isConnect;
BluetoothDevicedevice;
/**
* @param devicee 蓝牙设备对象
*/
public PrintBean(BluetoothDevice devicee) {
this.name = TextUtils.isEmpty(devicee.getName()) ?"未知" : devicee.getName();
this.address = devicee.getAddress();
this.isConnect = devicee.getBondState() == BluetoothDevice.BOND_BONDED;
this.type = devicee.getBluetoothClass().getDeviceClass();
}
public StringgetName() {
return name;
}
public StringgetAddress() {
return address;
}
public int getTypeIcon() {
if (type ==260) {
return R.drawable.ic_computer_black_24dp;
}else if (type ==PRINT_TYPE) {
return R.drawable.ic_local_printshop_black_24dp;
}else if (type ==524) {
return R.drawable.ic_phone_android_black_24dp;
}else {
return R.drawable.ic_issue;
}
}
public StringgetDeviceType(View view) {
if (type ==PRINT_TYPE) {
view.setSelected(true);
return isConnect ?"选择打印" :"点击连接";
}else {
view.setSelected(false);
return "非打印设备";
}
}
public int getType() {
return type;
}
public boolean isConnect() {
return isConnect;
}
public BluetoothDevicegetDevice() {
return device;
}
public void setConnect(boolean connect) {
isConnect = connect;
}
}
2.创建一个Activity类
public class PrintActivityextends BaseActivity {
private ContextmContext = PrintActivity.this;
//设备列表
private ListViewlistView;
private ArrayListmBluetoothDevicesDatas;
private PrintAdapteradapter;
//蓝牙适配器
private BluetoothAdaptermBluetoothAdapter;
//请求的code
public static final int REQUEST_ENABLE_BT =1;
private SwitchmSwitch;
private FloatingActionButtonmFloatingActionButton;
private ProgressBarmProgressBar;
private TextViewsearchHint;
private IntentFilterfilter;
/**
* 启动打印页面
*
* @param printContent 要打印的内容
*/
public static void starUi(Context context, String printContent) {
Intent intent =new Intent(context, PrintActivity.class);
intent.putExtra("printContent", printContent);
context.startActivity(intent);
}
private StringprintContent;
private Stringaddress;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_print);
//广播注册
filter =new IntentFilter(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy
//初始化
android.support.v7.app.ActionBar actionBar = getSupportActionBar();
if(actionBar !=null){
actionBar.setHomeButtonEnabled(true);
actionBar.setDisplayHomeAsUpEnabled(true);
}
setTitle(R.string.select_printing_device);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mSwitch = (Switch) findViewById(R.id.switch1);
mFloatingActionButton = (FloatingActionButton) findViewById(R.id.floatingActionButton);
mProgressBar = (ProgressBar) findViewById(R.id.progressBar3);
searchHint = (TextView) findViewById(R.id.searchHint);
listView = (ListView) findViewById(R.id.listView);
mBluetoothDevicesDatas =new ArrayList<>();
printContent=getIntent().getStringExtra("printContent");
Log.e("content",printContent);
adapter =new PrintAdapter(this, mBluetoothDevicesDatas, TextUtils.isEmpty(printContent)?"\n 内容为空 \n\n":printContent);
// adapter = new PrintAdapter(this, mBluetoothDevicesDatas, TextUtils.isEmpty(printContent)?name:printContent);
listView.setAdapter(adapter);
chechBluetooth();
addViewListener();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:
finish();
break;
}
return true;
}
/**
* 添加View的监听
*/
private void addViewListener() {
//蓝牙的状态
mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
openBluetooth();
setViewStatus(true);
}else {
closeBluetooth();
}
}
});
//重新搜索
mFloatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (mSwitch.isChecked()) {
searchDevices();
setViewStatus(true);
}else {
openBluetooth();
setViewStatus(true);
}
}
});
}
/**
* 打开蓝牙
*/
public void openBluetooth() {
Intent intent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); // 设置蓝牙可见性，最多300秒
intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 20);
startActivityForResult(intent, REQUEST_ENABLE_BT);
}
/**
* 关闭蓝牙
*/
public void closeBluetooth() {
mBluetoothAdapter.disable();
}
/**
* 判断有没有开启蓝牙
*/
private void chechBluetooth() {
//没有开启蓝牙
if (mBluetoothAdapter !=null) {
if (!mBluetoothAdapter.isEnabled()) {
Intent intent =new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); // 设置蓝牙可见性，最多300秒
intent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 20);
startActivityForResult(intent, REQUEST_ENABLE_BT);
setViewStatus(true);
//开启蓝牙
}else {
searchDevices();
setViewStatus(true);
mSwitch.setChecked(true);
}
}
}
/**
* 搜索状态调整
*
* @param isSearch 是否开始搜索
*/
private void setViewStatus(boolean isSearch) {
if (isSearch) {
mFloatingActionButton.setVisibility(View.GONE);
searchHint.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.VISIBLE);
}else {
mFloatingActionButton.setVisibility(View.VISIBLE);
mProgressBar.setVisibility(View.GONE);
searchHint.setVisibility(View.GONE);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mReceiver);
}
/**
* 搜索蓝牙设备
*/
public void searchDevices() {
mBluetoothDevicesDatas.clear();
adapter.notifyDataSetChanged();
//开始搜索蓝牙设备
mBluetoothAdapter.startDiscovery();
}
/**
* 通过广播搜索蓝牙设备
*/
private final BroadcastReceivermReceiver =new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// 把搜索的设置添加到集合中
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
//已经匹配的设备
if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
addBluetoothDevice(device);
//没有匹配的设备
}else {
addBluetoothDevice(device);
}
adapter.notifyDataSetChanged();
//搜索完成
}else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
setViewStatus(false);
}
}
/**
* 添加数据
* @param device 蓝牙设置对象
*/
private void addBluetoothDevice(BluetoothDevice device) {
for (int i =0; i
if (device.getAddress().equals(mBluetoothDevicesDatas.get(i).getAddress())) {
mBluetoothDevicesDatas.remove(i);
}
}
if (device.getBondState() == BluetoothDevice.BOND_BONDED && device.getBluetoothClass().getDeviceClass() ==PRINT_TYPE) {
mBluetoothDevicesDatas.add(0, new PrintBean(device));
}else {
mBluetoothDevicesDatas.add(new PrintBean(device));
}
}
};
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode ==RESULT_OK && requestCode ==REQUEST_ENABLE_BT) {
Log.e("text", "开启蓝牙");
searchDevices();
mSwitch.setChecked(true);
mBluetoothDevicesDatas.clear();
adapter.notifyDataSetChanged();
}else if (resultCode ==RESULT_CANCELED && requestCode ==REQUEST_ENABLE_BT) {
Log.e("text", "没有开启蓝牙");
mSwitch.setChecked(false);
setViewStatus(false);
}
}
}
3. 适配器
public class PrintAdapterextends BaseAdapter {
private ArrayListmBluetoothDevicesDatas;
private ContextmContext;
//蓝牙适配器
private BluetoothAdaptermBluetoothAdapter;
//蓝牙socket对象
private BluetoothSocketmmSocket;
private UUIDuuid;
//打印的输出流
private static OutputStreamoutputStream =null;
//搜索弹窗提示
ProgressDialogprogressDialog =null;
private final int exceptionCod =100;
//打印的内容
private StringmPrintContent;
private ConnectThreadconnectThread;
//在打印异常时更新ui
Handlerhandler =new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
if (msg.what ==exceptionCod) {
Toast.makeText(mContext, "打印发送失败，请稍后再试", Toast.LENGTH_SHORT).show();
if (progressDialog !=null) {
progressDialog.dismiss();
}
}
}
};
/**
* @param context 上下文
* @param mBluetoothDevicesDatas 设备列表
* @param printContent 打印的内容
*/
public PrintAdapter(Context context, ArrayList mBluetoothDevicesDatas, String printContent) {
this.mBluetoothDevicesDatas = mBluetoothDevicesDatas;
mContext = context;
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mPrintContent = printContent;
uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
}
public int getCount() {
return mBluetoothDevicesDatas.size();
}
@Override
public ObjectgetItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public ViewgetView(final int position, View convertView, ViewGroup parent) {
convertView = LayoutInflater.from(mContext).inflate(R.layout.bluetooth_itme, null);
View icon = convertView.findViewById(R.id.icon);
TextView name = (TextView) convertView.findViewById(R.id.name);
TextView address = (TextView) convertView.findViewById(R.id.address);
TextView start = (TextView) convertView.findViewById(R.id.start);
final PrintBean dataBean =mBluetoothDevicesDatas.get(position);
icon.setBackgroundResource(dataBean.getTypeIcon());
name.setText(dataBean.name);
address.setText(dataBean.isConnect ?"已连接" :"未连接");
start.setText(dataBean.getDeviceType(start));
//点击连接与打印
convertView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
//如果已经连接并且是打印机
if (dataBean.isConnect &&dataBean.getType() ==PRINT_TYPE) {
if (mBluetoothAdapter.isEnabled()) {
if (connectThread !=null){
try {
mmSocket.close();
}catch (IOException e) {
e.printStackTrace();
}
connectThread=null;
}
connectThread =new ConnectThread(mBluetoothAdapter.getRemoteDevice(dataBean.address));
connectThread.start();
Log.e("address",dataBean.address);
progressDialog = ProgressDialog.show(mContext, "提示", "正在打印...", true);
}else {
Toast.makeText(mContext, "蓝牙没有打开", Toast.LENGTH_SHORT).show();
}
//没有连接
}else {
//是打印机
if (dataBean.getType() ==PRINT_TYPE) {
setConnect(mBluetoothAdapter.getRemoteDevice(dataBean.address), position);
//不是打印机
}else {
Toast.makeText(mContext, "该设备不是打印机", Toast.LENGTH_SHORT).show();
}
}
}catch (Exception e) {
e.printStackTrace();
}
}
});
return convertView;
}
/**
* 匹配设备
*
* @param device 设备
*/
private void setConnect(BluetoothDevice device, int position) {
try {
Method createBondMethod = BluetoothDevice.class.getMethod("createBond");
createBondMethod.invoke(device);
mBluetoothDevicesDatas.get(position).setConnect(true);
notifyDataSetChanged();
}catch (Exception e) {
e.printStackTrace();
}
}
/**
* 发送数据
*/
public void send(String sendData) {
try {
byte[] data = sendData.getBytes("gbk");
outputStream.write(data, 0, data.length);
outputStream.flush();
outputStream.close();
progressDialog.dismiss();
Log.e("打印内容", Arrays.toString(data));
// ConnectThread.sleep(5000);
ConnectThread.sleep(1000);
}catch (IOException e) {
e.printStackTrace();
Log.e("打印内容", e.getMessage());
handler.sendEmptyMessage(exceptionCod); // 向Handler发送消息,更新UI
}catch (InterruptedException e) {
e.printStackTrace();
}
}
/**
* 连接为客户端
*/
private class ConnectThreadextends Thread {
public ConnectThread(BluetoothDevice device) {
try {
mmSocket = device.createRfcommSocketToServiceRecord(uuid);
}catch (IOException e) {
e.printStackTrace();
}
}
public void run() {
//取消的发现,因为它将减缓连接
mBluetoothAdapter.cancelDiscovery();
try {
//连接socket
mmSocket.connect();
//连接成功获取输出流
outputStream =mmSocket.getOutputStream();
send(mPrintContent);
Log.e("发送内容",mPrintContent);
}catch (Exception connectException) {
Log.e("test", "连接失败");
connectException.printStackTrace();
//异常时发消息更新UI
Message msg =new Message();
msg.what =exceptionCod;
// 向Handler发送消息,更新UI
handler.sendMessage(msg);
try {
mmSocket.close();
}catch (Exception closeException) {
closeException.printStackTrace();
}
return;
}
}
}
}
bluetooth_itme.xml 布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:padding="15dp">
android:id="@+id/icon"
android:layout_width="15dp"
android:layout_height="15dp"
android:layout_gravity="center_vertical"
android:layout_marginRight="10dp"
android:background="@mipmap/ic_launcher"
android:text="名称" />
android:id="@+id/name"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="2"
android:text="名称" />
android:id="@+id/address"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="地址" />
android:id="@+id/start"
android:layout_width="85dp"
android:layout_height="wrap_content"
android:background="@drawable/bg_print"
android:gravity="center"
android:padding="5dp"
android:textSize="14sp"
android:text="非打印设备"
android:textColor="@color/select_print_color" />
</LinearLayout>
activity_print.xml布局文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorWhite"
android:orientation="vertical">
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:paddingLeft="15dp"
android:paddingRight="15dp">
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="蓝牙开关"
android:textColor="#ff000000"
android:textSize="14sp" />
<Switch xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/switch1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:textColor="@color/colorAccent"
android:textSize="16sp" />
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#ffcccccc" />
android:layout_width="match_parent"
android:layout_height="50dp"
android:paddingLeft="15dp"
android:paddingRight="15dp">
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:text="搜索"
android:textColor="#ff000000"
android:textSize="14sp" />
android:id="@+id/searchHint"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="搜索中..."
android:textColor="#FF4081"
android:textSize="14sp" />
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true">
android:id="@+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:clickable="true"
app:fabSize="mini"
app:srcCompat="@drawable/ic_search_black_24dp" />
android:id="@+id/progressBar3"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" />
android:layout_width="match_parent"
android:layout_height="8dp"
android:background="#ffcccccc" />
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
ic_computer_black_24dp.xml drawable文件
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportHeight="24.0"
android:viewportWidth="24.0">
android:fillColor="#FFcccccc"
android:pathData="M20,18c1.1,0 1.99,-0.9 1.99,-2L22,6c0,-1.1 -0.9,-2 -2,-2H4c-1.1,0 -2,0.9 -2,2v10c0,1.1 0.9,2 2,2H0v2h24v-2h-4zM4,6h16v10H4V6z" />
</vector>
ic_local_printshop_black_24dp.xml 文件
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
android:fillColor="#FFcccccc"
android:pathData="M19,8L5,8c-1.66,0 -3,1.34 -3,3v6h4v4h12v-4h4v-6c0,-1.66 -1.34,-3 -3,-3zM16,19L8,19v-5h8v5zM19,12c-0.55,0 -1,-0.45 -1,-1s0.45,-1 1,-1 1,0.45 1,1 -0.45,1 -1,1zM18,3L6,3v4h12L18,3z"/>
</vector>
ic_phone_android_black_24dp.xml 文件
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
android:fillColor="#FFcccccc"
android:pathData="M16,1L8,1C6.34,1 5,2.34 5,4v16c0,1.66 1.34,3 3,3h8c1.66,0 3,-1.34 3,-3L19,4c0,-1.66 -1.34,-3 -3,-3zM14,21h-4v-1h4v1zM17.25,18L6.75,18L6.75,4h10.5v14z"/>
</vector>
ic_issue.xml文件
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportHeight="1024.0"
android:viewportWidth="1024.0">
android:fillColor="#FFcccccc"
android:pathData="M506.7,135.7c-202.2,0 -366.1,163.9 -366.1,366.1 0,202.2 163.9,366.1 366.1,366.1 202.2,0 366.1,-163.9 366.1,-366.1C872.8,299.6 708.9,135.7 506.7,135.7L506.7,135.7zM504.4,716.2c-21.2,0 -38.5,-16.9 -38.5,-37.7 0,-20.8 17.2,-37.7 38.5,-37.7 21.2,0 38.5,16.9 38.5,37.7C542.9,699.3 525.6,716.2 504.4,716.2L504.4,716.2zM649.5,458.5c-10.6,16.6 -33.1,39.3 -67.6,68 -17.9,14.8 -28.9,26.8 -33.2,35.8 -4.3,9 -6.3,25.2 -5.9,48.5l-76.9,0c-0.2,-11 -0.3,-17.8 -0.3,-20.2 0,-24.9 4.1,-45.4 12.4,-61.4 8.2,-16.1 24.7,-34.2 49.4,-54.2 24.7,-20.1 39.5,-33.2 44.3,-39.5 7.4,-9.8 11.2,-20.7 11.2,-32.5 0,-16.4 -6.6,-30.5 -19.8,-42.2 -13.2,-11.7 -30.9,-17.6 -53.3,-17.6 -21.5,0 -39.5,6.1 -54,18.3 -14.5,12.2 -26.9,39.1 -29.9,55.8 -2.8,15.7 -78.6,22.3 -77.7,-9.5 0.9,-31.9 17.5,-66.5 46,-91.6 28.4,-25.1 65.8,-37.6 112,-37.6 48.6,0 87.3,12.7 116,38.1 28.7,25.4 43.1,55 43.1,88.7C665.3,424.2 660,441.8 649.5,458.5L649.5,458.5zM649.5,458.5" />
</vector>
清单文件中需要的权限
<uses-permission android:name="android.permission.BLUETOOTH" />
<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
注意：如果你需要连接一次蓝牙后无需在连接 进行打印，需要注意以下代码
private Stringaddress ="";
private BluetoothAdaptermBluetoothAdapter;
private IntentFilterfilter;
private Stringaction;
private UUIDuuid;
在onCreate 方法中添加
filter =new IntentFilter(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
mBluetoothAdapter.startDiscovery();
uuid = UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");
/**
* 通过广播搜索蓝牙设备
*/
private ArrayListmBluetoothDevicesDatas =new ArrayList<>();
private BluetoothSocketmmSocket;
private static OutputStreamoutputStream =null;
private final BroadcastReceivermReceiver =new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
action = intent.getAction();
// 把搜索的设置添加到集合中
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
//已经匹配的设备
if (device.getBondState() == BluetoothDevice.BOND_BONDED) {
addBluetoothDevice(device);
address = device.getAddress();
// progressDialog = ProgressDialog.show(HistoryAddActivity.this, "提示", "正在打印...", true);
Log.e("his address",address);
//没有匹配的设备
}else {
addBluetoothDevice(device);
}
//搜索完成
}else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
// setViewStatus(false);
}
}
/**
* 添加数据
* @param device 蓝牙设置对象
*/
private void addBluetoothDevice(BluetoothDevice device) {
for (int i =0; i
if (device.getAddress().equals(mBluetoothDevicesDatas.get(i).getAddress())) {
mBluetoothDevicesDatas.remove(i);
}
}
if (device.getBondState() == BluetoothDevice.BOND_BONDED && device.getBluetoothClass().getDeviceClass() ==PRINT_TYPE) {
mBluetoothDevicesDatas.add(0, new PrintBean(device));
}else {
mBluetoothDevicesDatas.add(new PrintBean(device));
}
}
};
/**
* 发送数据
*/
public void send(String datamessage) {
try {
if (mmSocket !=null) {
mmSocket.connect();
//连接成功获取输出流
}
outputStream =mmSocket.getOutputStream();
byte[] data = datamessage.getBytes("GBK");
outputStream.write(data, 0, data.length);
outputStream.flush();
// outputStream.close();
progressDialog.dismiss();
// Log.e("打印内容",Arrays.toString(data));
// ConnectThread.sleep(1000);
}catch (IOException e) {
e.printStackTrace();
Log.e("打印内容",e.getMessage());
handler.sendEmptyMessage(exceptionCod); // 向Handler发送消息,更新UI
}
}
private class ConnectThreadextends Thread {
Stringdatamessage;
public ConnectThread(BluetoothDevice device,String datamessages) {
datamessage = datamessages;
BluetoothSocket tmp =null;
try {
tmp = device.createRfcommSocketToServiceRecord(uuid);
}catch (IOException e) {
e.printStackTrace();
}
mmSocket = tmp;
}
public void run() {
//取消的发现,因为它将减缓连接
mBluetoothAdapter.cancelDiscovery();
try {
send(datamessage);
Log.e("发送内容",datamessage);
}catch (Exception connectException) {
Log.e("test", "连接失败");
connectException.printStackTrace();
//异常时发消息更新UI
try {
mmSocket.close();
}catch (Exception closeException) {
closeException.printStackTrace();
}
return;
}
}
}
@Override
protected void onResume() {
super.onResume();
if (connectThread !=null){
try {
mmSocket.close();
}catch (IOException e) {
e.printStackTrace();
}
connectThread =null;
}else {
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
registerReceiver(mReceiver, filter);
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (connectThread !=null){
try {
mmSocket.close();
}catch (IOException e) {
e.printStackTrace();
}
connectThread=null;
}
unregisterReceiver(mReceiver);
}
注意：一定要在activity销毁的时候清空sockt，不然会出现打印信息不完整。
打印功能触发的时候 跟据address 是否为空 判定是否有连接设备，
if (mBluetoothAdapter.isEnabled()){
if (address.equals("")){
PrintActivity.starUi(HistoryItemDetailsActivity.this, print);
}else {
connectThread =new ConnectThread(mBluetoothAdapter.getRemoteDevice(address),print);
connectThread.start();
progressDialog = ProgressDialog.show(HistoryItemDetailsActivity.this, "提示", "正在打印...", true);
}
}else {
Log.e("text", "没有开启蓝牙");
PrintActivity.starUi(HistoryItemDetailsActivity.this, print);
}
希望对你有帮助！
