MainActivity 示例

package com.lingrui.btprint;

import android.Manifest;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.activity.EdgeToEdge;
import androidx.activity.result.ActivityResult;
import androidx.activity.result.ActivityResultCallback;
import androidx.activity.result.ActivityResultLauncher;
import androidx.activity.result.contract.ActivityResultContracts;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Method;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Set;
import java.util.UUID;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    // 弹窗
    private Toast mToast;
    // 常量
    private static final int REQ_PERMISSION_CODE = 1;
    // 蓝牙权限列表
    public ArrayList<String> requestList = new ArrayList<>();
    // 搜索蓝牙广播
    private IntentFilter foundFilter;
    //
    public ArrayAdapter adapter1;
    //定义一个列表，存蓝牙设备的地址。
    public ArrayList<String> arrayList = new ArrayList<>();
    //定义一个列表，存蓝牙设备地址，用于显示。
    public ArrayList<String> deviceName = new ArrayList<>();
    private BluetoothSocket btSocket;
    private String TAG = "";
    public static final int RECV_VIEW = 0;
    public static final int NOTICE_VIEW = 1;
    private static OutputStream outputStream = null;
    private static InputStream inputStream = null;
    public static String MY_UUID = "DC:0D:30:D6:0F:50";
    /**
     * 代表本地蓝牙适配器（蓝牙无线电）。BluetoothAdapter是所有蓝牙交互的入口。
     * 使用这个你可以发现其他蓝牙设备，查询已配对的设备列表，
     * 使用一个已知的MAC地址来实例化一个BluetoothDevice，
     * 以及创建一个BluetoothServerSocket来为监听与其他设备的通信。
     */
    private BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    /**
     * 代表一个远程蓝牙设备，使用这个来请求一个与远程设备的BluetoothSocket连接，
     * 或者查询关于设备名称、地址、类和连接状态等设备信息。
     */
    private BluetoothDevice mBluetoothDevice = null;
    /**
     * 代表一个蓝牙socket的接口（和TCP Socket类似）。这是一个连接点，
     * 它允许一个应用与其他蓝牙设备通过InputStream和OutputStream交换数据。
     */
    private BluetoothSocket mBluetoothSocket = null;

    private String pdfPath="";

    //替换旧版本中的startactivityresult
    public ActivityResultLauncher<Intent> register;
    ActivityResultLauncher<Intent> startBlueTooth = registerForActivityResult(new ActivityResultContracts.StartActivityForResult(), new ActivityResultCallback<ActivityResult>() {
        @Override
        public void onActivityResult(ActivityResult result) {
            if (result == null) {
                Log.e("error:", "打开失败");
            } else {
                if (result.getResultCode() == RESULT_CANCELED) {
                    Log.d("debug", "用户取消");
                }
            }
        }
    });

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_main);
        //点击蓝牙按钮
        Button btBlt = findViewById(R.id.bt_blt);
        btBlt.setOnClickListener(this);

        // 通过id获取“是否支持蓝牙”按钮
        Button button_3 = (Button) findViewById(R.id.button3);
        // 是否支持蓝牙按钮点击事件处理函数
        button_3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 获取蓝牙权限
                getPermision();
                // 判断是否支持蓝牙
                boolean ret = isSupportBlueTooth();
                // 弹窗显示结果
                showToast("是否支持蓝牙" + ret);
            }
        });


        //当前蓝牙状态
        Button button_4 = findViewById(R.id.button4);
        button_4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //获取蓝牙权限
                getPermision();
                //显示蓝牙状态；
                boolean ret = getBlueToothStatus();
                showToast("当前蓝牙状态：" + ret);
            }
        });

        //打开蓝牙按钮点击事件
        Button bt_open = findViewById(R.id.button7);
        bt_open.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                boolean ret = turnOnBlueTooth(MainActivity.this, 1);
                showToast("蓝牙开启状态：" + ret);
            }
        });
        //关闭蓝牙点击事件
        Button bt_close = findViewById(R.id.button8);
        bt_close.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                turnOffBlueTooth();
            }
        });

        //打印
        Button bt_print = findViewById(R.id.bt_print);
        bt_print.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    Log.d("debug", "蓝牙打印按钮0");
                    if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                        return;
                    }
                    MY_UUID = "00001101-0000-1000-8000-00805F9B34FB";
                    Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
                    //getBondedDevices 方法返回已经配对的蓝牙设备的集合。通过遍历集合，可以获取设备的名称和地址等信息
                    //或者，根据已绑定的名称和网卡信息，强制指定；
                    for (BluetoothDevice device : pairedDevices) {
                        String deviceName = device.getName();
                        String deviceAddress = device.getAddress();
                        // 处理找到的设备信息,这是最后一个绑定的设备，如果有多个绑定的打印机，应该做一个选择的界面，让人手工点击，或选择默认的
                        mBluetoothDevice = device;
                    }
                    BluetoothSocket socket = mBluetoothDevice.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID));

                    Log.d("debug", MY_UUID);
                    socket.connect();

                    // 开启一个子线程
                    new Thread() {
                        public void run() {
                            try {
                                //调用另一个Pos 打印类
                                Pos pos  = new Pos(socket,"GBK");
                                //初始化打印机
                                pos.initPos();

                                pos.bold(true);
                                pos.printTabSpace(2);
                                pos.printWordSpace(1);
                                pos.printText("**测试店铺");

                                pos.printLocation(0);
                                pos.printTextNewLine("----------------------------------------------");
                                pos.bold(false);
                                pos.printTextNewLine("订 单 号：1005199");
                                pos.printTextNewLine("用 户 名：15712937281");
                                pos.printTextNewLine("桌    号：3号桌");
                                pos.printTextNewLine("订单状态：订单已确认");
                                pos.printTextNewLine("订单日期：2016/2/19 12:34:53");
                                pos.printTextNewLine("付 款 人：线下支付（服务员：宝哥）");
                                pos.printTextNewLine("服 务 员：1001");
                                pos.printTextNewLine("订单备注：不要辣，少盐");
                                pos.printLine(2);

                                pos.printText("品项");
                                pos.printLocation(20, 1);
                                pos.printText("单价");
                                pos.printLocation(99, 1);
                                pos.printWordSpace(1);
                                pos.printText("数量");
                                pos.printWordSpace(3);
                                pos.printText("小计");
                                pos.printTextNewLine("----------------------------------------------");



                                pos.printLocation(1);
                                pos.printLine(2);
                                //打印二维码
                                pos.qrCode("http://blog.csdn.net/haovip123");

                                //切纸
                                pos.feedAndCut();

                                pos.closeIOAndSocket();
                                pos = null;
                            } catch (UnknownHostException e)
                            {
                                showToast("错误1："+e.getMessage());
                                e.printStackTrace();
                            } catch (IOException e) {
                                showToast("错误2："+e.getMessage());
                                e.printStackTrace();
                            }
                        }

                    }.start();


            /*        //连接成功后，我们可以通过蓝牙连接发送打印指令给蓝牙标签打印机。
                    outputStream = socket.getOutputStream();
                    StringBuilder content = new StringBuilder();
                    //设置纸张大小，浓度等打印机参数
                    byte[] sizeCmd = {0x1D, 0x57, 0x40, 0x1D, 0x57, 0x40};
                     outputStream.write(sizeCmd);
                    byte[] densityCmd = {0x1D, 0x63, 0x30};
                    outputStream.write(densityCmd);
                    //检查打印机状态的代码示例
                    inputStream = socket.getInputStream();
                    byte[] statusCmd = {0x10, 0x04, 0x01};
                    outputStream.write(statusCmd);
                    outputStream.flush();
                    int tmp = inputStream.read();
                    if (tmp == 18)
                    {
                        showToast("读取打印机状态成功");
                         ;
                    } else
                    {
                        showToast("读取打印机状态失败"+String.valueOf(tmp));
                        //return ;
                    }
                    int bytesRead;
                    String ptString="壮骨麝香止痛膏\n";*/
                    //outputStream.write(content.toString().getBytes("GBK"));
                } catch (Exception ex) {
                    showToast("打印出错："+ex.getMessage());
                }

            }
        });



        //打印PDF 测试
        Button bt_pdf = findViewById(R.id.bt_pdf);
        bt_pdf.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                File pdf;
                if (TextUtils.isEmpty(pdfPath)) {

                    return;
                }
                pdf = new File(pdfPath);
                if (!pdf.exists()) {
                    return;
                }
            }
        });

        //使蓝牙可见点击事件
        Button bt_visable = findViewById(R.id.button9);
        bt_visable.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                enableVisibly(MainActivity.this);
            }
        });

        // 通过id获取”搜索可见蓝牙“按钮
        Button button_6 = (Button) findViewById(R.id.button10);
        // 绑定按钮点击事件处理函数
        button_6.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 获取蓝牙权限
                getPermision();
                // 注册广播
                registerReceiver(bluetoothReceiver, foundFilter);
                // 初始化各列表
                arrayList.clear();
                deviceName.clear();
                adapter1.notifyDataSetChanged();
                // 开始搜索
                findDevice();
            }
        });
        //搜索蓝牙的广播
        foundFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        foundFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);
        foundFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        // 获取ListView组件
        ListView listView = (ListView) findViewById(R.id.listview1);
        // 实例化ArrayAdapter对象
        adapter1 = new ArrayAdapter(this, android.R.layout.simple_expandable_list_item_1, deviceName);
        // 添加到ListView组件中
        listView.setAdapter(adapter1);

        // 通过id获取”查看已绑定蓝牙“按钮
        Button button_7 = (Button) findViewById(R.id.button11);
        // 绑定按钮点击事件处理函数
        button_7.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // 获取蓝牙权限
                getPermision();
                // 初始化各列表
                deviceName.clear();
                arrayList.clear();
                adapter1.notifyDataSetChanged();
                // 获取已绑定蓝牙
                ArrayList<BluetoothDevice> bluetoothDevices = getBondedDeviceList();
                // 更新列表
                for (int i = 0; i < bluetoothDevices.size(); i++) {
                    BluetoothDevice device = bluetoothDevices.get(i);
                    arrayList.add(device.getAddress());
                    if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {

                        return;
                    }
                    if (device.getBondState() == 12) {
                        deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n");
                    } else if (device.getBondState() == 10) {
                        deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n");
                    } else {
                        deviceName.add("设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未知" + "\n");
                    }
                    adapter1.notifyDataSetChanged();
                }
            }
        });

        //列表框监听事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                CharSequence content = ((TextView) view).getText();
                String con = content.toString();
                String[] conArray = con.split("\n");
                String rightStr = conArray[1].substring(5, conArray[1].length());
                BluetoothDevice device = find_device(rightStr);
                if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                    // TODO: Consider calling
                    //    ActivityCompat#requestPermissions
                    // here to request the missing permissions, and then overriding
                    //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                    //                                          int[] grantResults)
                    // to handle the case where the user grants the permission. See the documentation
                    // for ActivityCompat#requestPermissions for more details.
                    return;
                }
                if (device.getBondState() == 10) {
                    mBluetoothAdapter.cancelDiscovery();
                    ;
                    String s = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n";
                    deviceName.remove(s);
                    device.createBond();
                    s = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n";
                    deviceName.add(s);
                    adapter1.notifyDataSetChanged();
                    showToast("配对：" + device.getName());
                } else {
                    mBluetoothAdapter.cancelDiscovery();
                    ;
                    String s2 = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n";
                    if (deviceName.contains(s2)) {
                        unpairDevice(device);
                        deviceName.remove(s2);
                        s2 = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n";
                        deviceName.add(s2);
                        adapter1.notifyDataSetChanged();
                        showToast("取消配对：" + device.getName());
                    }
                }
            }
        });


    }

    /**
     * 是否支持蓝牙
     * @return true支持，false不支持
     */
    public boolean isSupportBlueTooth() {
        // 若支持蓝牙，则本地适配器不为null
        if (mBluetoothAdapter != null) {
            return true;
        }
        // 否则不支持
        else {
            return false;
        }
    }

    /**
     * 判断当前蓝牙状态
     * @return true为打开，false为关闭
     */
    public boolean getBlueToothStatus() {
        // 断言？为了避免mAdapter为null导致return出错
        assert (mBluetoothAdapter != null);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return false;
        }
        boolean disable = mBluetoothAdapter.disable();
        showToast("tttt:" + disable);
        boolean ret = mBluetoothAdapter.isEnabled();
        showToast("tttt:" + ret);
        return ret;

    }

    /**
     * 打开蓝牙
     */
    public boolean turnOnBlueTooth(Activity activity, int requestCode) {
        //检查蓝牙权限
        getPermision();
        if (!mBluetoothAdapter.isEnabled()) {
            Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            register.launch(intent);
            Log.d("debug", "启动蓝牙");
            //activity.startActivityForResult(intent, requestCode);

            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return false;
            }
            boolean enable = mBluetoothAdapter.enable();
            Log.d("debug", "蓝牙开启状态:" + String.valueOf(enable));
            return true;
        } else {
            return true;
        }
    }

    /**
     * 关闭蓝牙
     * @return
     */
    public void turnOffBlueTooth() {

        if (mBluetoothAdapter.isEnabled()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
                checkConnectPermission();
            }
            boolean ret = mBluetoothAdapter.disable();
            showToast("蓝牙关闭:" + ret);
        }
    }


    @Override

    public void onClick(View v) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            checkConnectPermission();
        }
        Toast.makeText(getApplicationContext(), "蓝牙TEST", Toast.LENGTH_SHORT).show();

        try {
            Log.d("debug", "点击打开蓝牙按钮");
            mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

            // 如果设备不支持蓝牙
            if (mBluetoothAdapter == null) {
                Log.d("debug", "设备不支持蓝牙");
                return;
            }
            // 设备支持蓝牙功能，启动蓝牙
            if (!mBluetoothAdapter.isEnabled()) {

                register.launch(new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE));
                Log.d("debug", "启动蓝牙");

            }

            //打开蓝牙
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            boolean enable = mBluetoothAdapter.enable();
            Log.d("debug", "蓝牙开启状态:" + String.valueOf(enable));
            //取得蓝牙开启状态

            //一旦蓝牙已经打开，我们可以使用蓝牙适配器来搜索附近的蓝牙设备

            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
            //getBondedDevices 方法返回已经配对的蓝牙设备的集合。通过遍历集合，可以获取设备的名称和地址等信息
            for (BluetoothDevice device : pairedDevices) {
                String deviceName = device.getName();
                String deviceAddress = device.getAddress();
                // 处理找到的设备信息
                mBluetoothDevice = device;
            }
            Log.d("debug", "步骤四：连接蓝牙设备");
            Toast.makeText(getApplicationContext(), "蓝牙TEST", Toast.LENGTH_SHORT).show();
            /*步骤四：连接蓝牙设备
            在搜索到蓝牙设备后，我们需要选择一个设备进行连接*/
            MY_UUID = "00001101-0000-1000-8000-00805F9B34FB";
            BluetoothSocket socket = mBluetoothDevice.createRfcommSocketToServiceRecord(UUID.fromString(MY_UUID));
            Log.d("debug", MY_UUID);
            socket.connect();
            //连接成功后，我们可以通过蓝牙连接发送打印指令给蓝牙标签打印机。
            OutputStream outputStream = socket.getOutputStream();
            String ptString="壮骨麝香止痛膏\n";
            ptString +="壮骨麝香止痛膏\n";
            ptString +="壮骨麝香止痛膏\n";
            ptString +="壮骨麝香止痛膏\n";
           printPDF("88.pdf") ;


            //outputStream.write(ptString.getBytes("GBK"));
            PrintUtils.setOutputStream(outputStream);
            testPrint();
            byte[] bytes = {29, 86, 0};
            outputStream.write(bytes);
            socket.close();;


        } catch (IllegalStateException | IOException e) {
            Log.d("debug", e.getMessage());
            Toast.makeText(getApplicationContext(), "蓝牙打开失败：" + "\n" + e.getMessage(), Toast.LENGTH_SHORT).show();
        }


    }


    @RequiresApi(api = Build.VERSION_CODES.S)
    private void checkConnectPermission() {

        if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.BLUETOOTH_CONNECT) == PackageManager.PERMISSION_DENIED) {
            Log.i("MES", "SUCCESS");
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.BLUETOOTH_CONNECT}, 2);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_DENIED) {
            Log.i("MES", "SUCCESS");
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, 2);

        }
        if (ContextCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.BLUETOOTH_SCAN) == PackageManager.PERMISSION_DENIED) {
            Log.i("MES", "SUCCESS");
            ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.BLUETOOTH_SCAN}, 2);
        }
    }

    /**
     * 动态申请权限
     */
    public void getPermision() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
            requestList.add(Manifest.permission.BLUETOOTH_SCAN);
            requestList.add(Manifest.permission.BLUETOOTH_ADVERTISE);
            requestList.add(Manifest.permission.BLUETOOTH_CONNECT);
            requestList.add(Manifest.permission.ACCESS_FINE_LOCATION);
            requestList.add(Manifest.permission.ACCESS_COARSE_LOCATION);
            requestList.add(Manifest.permission.BLUETOOTH);
        }
        if (requestList.size() != 0) {
            ActivityCompat.requestPermissions(this, requestList.toArray(new String[0]), REQ_PERMISSION_CODE);
        }
    }

    /**
     * 打开蓝牙可见性
     * @param context
     */
    public void enableVisibly(Context context) {
        getPermision();
        Intent discoverableIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        discoverableIntent.putExtra(BluetoothAdapter.EXTRA_DISCOVERABLE_DURATION, 300);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_ADVERTISE) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        context.startActivity(discoverableIntent);
        //Context.register.launch(discoverableIntent);
    }


    /**
     * Toast弹窗显示
     * @param text  显示文本
     */
    public void showToast(String text) {
        // 若Toast控件未初始化
        if (mToast == null) {
            // 则初始化
            mToast = Toast.makeText(this, text, Toast.LENGTH_SHORT);
        }
        // 否则
        else {
            // 修改显示文本
            mToast.setText(text);
        }
        // 显示
        mToast.show();
    }

    // 蓝牙状态改变广播
    private BroadcastReceiver receiver = new BroadcastReceiver() {

        @Override
        public void onReceive(Context context, Intent intent) {
            int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1);
            switch (state) {
                case BluetoothAdapter.STATE_OFF:
                    showToast("STATE_OFF");
                    break;
                case BluetoothAdapter.STATE_ON:
                    showToast("STATE_ON");
                    break;
                case BluetoothAdapter.STATE_TURNING_OFF:
                    showToast("STATE_TURNING_OFF");
                    break;
                case BluetoothAdapter.STATE_TURNING_ON:
                    showToast("STATE_TURNING_ON");
                    break;
                default:
                    showToast("UnKnow STATE");
                    unregisterReceiver(this);
                    break;
            }
        }
    };

    private final BroadcastReceiver bluetoothReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                String s;
                BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                    return;
                }
                if (device.getBondState() == 12) {
                    s = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：已配对" + "\n";
                } else if (device.getBondState() == 10) {
                    s = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未配对" + "\n";
                } else {
                    s = "设备名：" + device.getName() + "\n" + "设备地址：" + device.getAddress() + "\n" + "连接状态：未知" + "\n";
                }
                if (!deviceName.contains(s)) {
                    deviceName.add(s);//将搜索到的蓝牙名称和地址添加到列表。
                    arrayList.add(device.getAddress());//将搜索到的蓝牙地址添加到列表。
                    adapter1.notifyDataSetChanged();//更新
                }
            } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
                showToast("搜索结束");
                unregisterReceiver(this);
            } else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {
                showToast("开始搜索");
            }
        }
    };


    /**
     * 获取绑定设备
     * @return
     */
    public ArrayList<BluetoothDevice> getBondedDeviceList() {
        getPermision();
        return new ArrayList<BluetoothDevice>(mBluetoothAdapter.getBondedDevices());
    }

    /**
     * 查找设备
     */
    public boolean findDevice() {
        assert (mBluetoothAdapter != null);
        if (mBluetoothAdapter.isDiscovering()) {
            mBluetoothAdapter.cancelDiscovery();
            return false;
        } else {
            return mBluetoothAdapter.startDiscovery();
        }
    }


    /**
     * 根据蓝牙地址找到相应的设备
     * @param addr
     * @return
     */
    public BluetoothDevice find_device(String addr) {
        return mBluetoothAdapter.getRemoteDevice(addr);
    }

    /**
     * 连接设备
     */
    public void connect_init(BluetoothDevice device) {
        mBluetoothAdapter.cancelDiscovery();
        try {
            Log.d("Debug ","ttttttttttttttttttttt");
            Method clientMethod = device.getClass().getMethod("createRfcommSocketToServiceRecord", new Class[]{int.class});
            btSocket = (BluetoothSocket) clientMethod.invoke(device, 1);
            connect(btSocket);

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void connect(final BluetoothSocket btSocket) {
        try {
            if (btSocket.isConnected()) {
                Log.e(TAG, "connect: 已经连接");
                return;
            }
            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
                // TODO: Consider calling
                //    ActivityCompat#requestPermissions
                // here to request the missing permissions, and then overriding
                //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
                //                                          int[] grantResults)
                // to handle the case where the user grants the permission. See the documentation
                // for ActivityCompat#requestPermissions for more details.
                return;
            }
            btSocket.connect();
            if (btSocket.isConnected()){
                Log.e(TAG, "connect: 连接成功");
            }else{
                Log.e(TAG, "connect: 连接失败");
                btSocket.close();

            }
        }catch (Exception e){e.printStackTrace();}
    }

    /**
     * 设置打印格式
     *
     * @param command 格式指令
     */
    public static void selectCommand(byte[] command) {
        try {
            outputStream.write(command);
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     * 尝试取消配对
     * @param device
     */
    private void unpairDevice(BluetoothDevice device) {
        try {
            Method m = device.getClass()
                    .getMethod("removeBond", (Class[]) null);
            m.invoke(device, (Object[]) null);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    void testPrint(){
        showToast("测试打印PrintUtils");
        PrintUtils.setOutputStream(outputStream);
        showToast("测试打印PrintUtils111111111111");
        PrintUtils.selectCommand(PrintUtils.RESET);
        showToast("测试打印PrintUtils22222222222222");
        PrintUtils.selectCommand(PrintUtils.LINE_SPACING_DEFAULT);
        showToast("测试打印PrintUtils333333333333");
        PrintUtils.selectCommand(PrintUtils.ALIGN_CENTER);
        PrintUtils.printText("美食餐厅\n\n");
        PrintUtils.selectCommand(PrintUtils.DOUBLE_HEIGHT_WIDTH);
        PrintUtils.printText("桌号：1号桌\n\n");
        PrintUtils.selectCommand(PrintUtils.NORMAL);
        PrintUtils.selectCommand(PrintUtils.ALIGN_LEFT);
        PrintUtils.printText(PrintUtils.printTwoData("订单编号", "201507161515\n"));
        PrintUtils.printText(PrintUtils.printTwoData("点菜时间", "2016-02-16 10:46\n"));
        PrintUtils.printText(PrintUtils.printTwoData("上菜时间", "2016-02-16 11:46\n"));
        PrintUtils.printText(PrintUtils.printTwoData("人数：2人", "收银员：张三\n"));

        PrintUtils.printText("--------------------------------\n");
        PrintUtils.selectCommand(PrintUtils.BOLD);
        PrintUtils.printText(PrintUtils.printThreeData("项目", "数量", "金额\n"));
        PrintUtils.printText("--------------------------------\n");
        PrintUtils.selectCommand(PrintUtils.BOLD_CANCEL);
        PrintUtils.printText(PrintUtils.printThreeData("面", "1", "0.00\n"));
        PrintUtils.printText(PrintUtils.printThreeData("米饭", "1", "6.00\n"));
        PrintUtils.printText(PrintUtils.printThreeData("铁板烧", "1", "26.00\n"));
        PrintUtils.printText(PrintUtils.printThreeData("一个测试", "1", "226.00\n"));
        PrintUtils.printText(PrintUtils.printThreeData("牛肉面啊啊", "1", "2226.00\n"));
        PrintUtils.printText(PrintUtils.printThreeData("牛肉面啊啊啊牛肉面啊啊啊", "888", "98886.00\n"));

        PrintUtils.printText("--------------------------------\n");
        PrintUtils.printText(PrintUtils.printTwoData("合计", "53.50\n"));
        PrintUtils.printText(PrintUtils.printTwoData("抹零", "3.50\n"));
        PrintUtils.printText("--------------------------------\n");
        PrintUtils.printText(PrintUtils.printTwoData("应收", "50.00\n"));
        PrintUtils.printText("--------------------------------\n");

        PrintUtils.selectCommand(PrintUtils.ALIGN_LEFT);
        PrintUtils.printText("备注：不要辣、不要香菜");
        PrintUtils.printText("\n\n\n\n\n");
    }


    /**
     * @param pdfPath 全路径
     */
    public void printPDF(final String pdfPath) {
        File pdf;
        if (TextUtils.isEmpty(pdfPath)) {
            return;
        }
        pdf = new File(pdfPath);
        if (!pdf.exists()) {
            return;
        }

        byte[] buf = new byte[1024];
        int bytesRead;
        FileInputStream input=null;
        try {
            input = new FileInputStream(pdfPath);
            while ((bytesRead = input.read(buf)) > 0) {
                outputStream.write(buf, 0, bytesRead);
            }
            outputStream.flush();
        } catch (IOException e) {
            Log.e("cmo", "打印图片异常：" + e.getMessage());
        }try {
            input.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}