Android开发之蓝牙连接打印机

我自横刀向天笑，去留肝胆两昆仑。这篇文章主要讲述Android开发之蓝牙连接打印机相关的知识，希望能为你提供帮助。
代码很简单，直接一个布局文件和一个activity。需要的朋友可以直接将这两部分粘贴复制到项目中即可。

文章图片

【Android开发之蓝牙连接打印机】Activity部分：

package com.anhua.bluetooth; import java.io.IOException; import java.io.OutputStream; import java.lang.reflect.Method; import java.util.ArrayList; import java.util.HashMap; import java.util.UUID; import com.example.imooc_weixinfragment.R; import android.app.Activity; import android.app.ProgressDialog; 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.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.AdapterView; import android.widget.Button; import android.widget.ImageView; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; import android.widget.Toast; import android.widget.AdapterView.OnItemClickListener; public class BluetoothActivity extends Activity implements OnClickListener {private ListView unbondDevices = null; private ListView bondDevices = null; private Context context = null; private BluetoothAdapter bluetoothAdapter = BluetoothAdapter .getDefaultAdapter(); private ArrayList< BluetoothDevice> unbondDeviceslist = null; // 用于存放未配对蓝牙设备 private ArrayList< BluetoothDevice> bondDeviceslist = null; // 用于存放已配对蓝牙设备 private ListView unbondDevicesListView = null; private ListView bondDevicesListView = null; private Button searchDevices; // 搜索蓝牙设备Button private TextView deviceName; // 蓝牙设备的名字 private TextView connectState = null; //蓝牙设备连接状态 private String address; // 蓝牙地址 private ImageView returnButton; private boolean isConnection = false; private BluetoothDevice devices = null; private static BluetoothSocket bluetoothSocket = null; private static final UUID uuid = UUID .fromString("00001101-0000-1000-8000-00805F9B34FB"); private static OutputStream outputStream = null; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.context = this; requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.bluetooth_layout); unbondDeviceslist = new ArrayList< BluetoothDevice> (); bondDeviceslist = new ArrayList< BluetoothDevice> (); this.initIntentFilter(); initView(); init(); }private void init() { deviceName=(TextView) findViewById(R.id.device_name); connectState=(TextView) findViewById(R.id.connect_state); unbondDevices = (ListView) this.findViewById(R.id.unbondDevices); bondDevices = (ListView) this.findViewById(R.id.bondDevices); searchDevices = (Button) this.findViewById(R.id.searchDevices); unbondDevicesListView = (ListView) findViewById(R.id.unbondDevices); bondDevicesListView = (ListView) findViewById(R.id.bondDevices); returnButton = (ImageView) this.findViewById(R.id.return_Bluetooth_btn); this.setSearchDevices(searchDevices); searchDevices.setOnClickListener(this); returnButton.setOnClickListener(this); }public void setSearchDevices(Button searchDevices) { this.searchDevices = searchDevices; }/** * 初始化界面 */ public void initView() {if (this.isOpen()) { System.out.println("蓝牙有开!"); } if (!this.isOpen()) { System.out.println("蓝牙没开!"); this.searchDevices.setEnabled(false); } }@Override protected void onDestroy() { // TODO Auto-generated method stub this.disconnect(); super.onDestroy(); }/** * 添加已绑定蓝牙设备到ListView */ private void addBondDevicesToListView() { ArrayList< HashMap< String, Object> > data = https://www.songbingjia.com/android/new ArrayList< HashMap< String, Object> > (); int count = this.bondDeviceslist.size(); System.out.println("已绑定设备数量：" + count); for (int i = 0; i < count; i++) { HashMap< String, Object> map = new HashMap< String, Object> (); map.put("deviceName", this.bondDeviceslist.get(i).getName()); data.add(map); // 把item项的数据加到data中 } String[] from = { "deviceName" }; int[] to = { R.id.device_name }; SimpleAdapter simpleAdapter = new SimpleAdapter(this.context, data, R.layout.bonddevice_item, from, to); // 把适配器装载到listView中 this.bondDevicesListView.setAdapter(simpleAdapter); this.bondDevicesListView .setOnItemClickListener(new OnItemClickListener() {@Override public void onItemClick(AdapterView< ?> arg0, View arg1, int arg2, long arg3) { deviceName.setVisibility(View.VISIBLE); connectState.setVisibility(View.VISIBLE); BluetoothDevice device = bondDeviceslist.get(arg2); address = device.getAddress(); // 获取蓝牙地址 devices=bluetoothAdapter.getRemoteDevice(address); deviceName.setText(getDeviceName()); // 一上来就先连接蓝牙设备 boolean flag = connect(); if (flag == false) { // 连接失败 connectState.setText("连接失败！"); } else { // 连接成功 connectState.setText("连接成功！"); } } }); }/** * 添加未绑定蓝牙设备到ListView */ private void addUnbondDevicesToListView() { ArrayList< HashMap< String, Object> > data = https://www.songbingjia.com/android/new ArrayList< HashMap< String, Object> > (); int count = this.unbondDeviceslist.size(); System.out.println("未绑定设备数量：" + count); for (int i = 0; i < count; i++) { HashMap< String, Object> map = new HashMap< String, Object> (); map.put("deviceName", this.unbondDeviceslist.get(i).getName()); data.add(map); // 把item项的数据加到data中 } String[] from = { "deviceName" }; int[] to = { R.id.undevice_name }; SimpleAdapter simpleAdapter = new SimpleAdapter(this.context, data, R.layout.unbonddevice_item, from, to); // 把适配器装载到listView中 unbondDevicesListView.setAdapter(simpleAdapter); // 为每个item绑定监听，用于设备间的配对 unbondDevicesListView.setOnItemClickListener(new OnItemClickListener() {@Override public void onItemClick(AdapterView< ?> arg0, View arg1, int arg2, long arg3) { try { Method createBondMethod = BluetoothDevice.class .getMethod("createBond"); createBondMethod.invoke(unbondDeviceslist.get(arg2)); // 将绑定好的设备添加的已绑定list集合 bondDeviceslist.add(unbondDeviceslist.get(arg2)); // 将绑定好的设备从未绑定list集合中移除 unbondDeviceslist.remove(arg2); addBondDevicesToListView(); addUnbondDevicesToListView(); } catch (Exception e) { Toast.makeText(context, "配对失败！", Toast.LENGTH_SHORT).show(); }} }); }private void initIntentFilter() { // 设置广播信息过滤 IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(BluetoothDevice.ACTION_FOUND); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED); intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED); intentFilter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED); // 注册广播接收器，接收并处理搜索结果 context.registerReceiver(receiver, intentFilter); }/** * 打开蓝牙 */ public void openBluetooth(Activity activity) { Intent enableBtIntent = new Intent( BluetoothAdapter.ACTION_REQUEST_ENABLE); activity.startActivityForResult(enableBtIntent, 1); }/** * 关闭蓝牙 */ public void closeBluetooth() { this.bluetoothAdapter.disable(); }/** * 判断蓝牙是否打开 * * @return boolean */ public boolean isOpen() { return this.bluetoothAdapter.isEnabled(); }/** * 搜索蓝牙设备 */ public void searchDevices() { this.bondDeviceslist.clear(); this.unbondDeviceslist.clear(); // 寻找蓝牙设备，android会将查找到的设备以广播形式发出去 this.bluetoothAdapter.startDiscovery(); }/** * 添加未绑定蓝牙设备到list集合 * * @param device */ public void addUnbondDevices(BluetoothDevice device) { System.out.println("未绑定设备名称：" + device.getName()); if (!this.unbondDeviceslist.contains(device)) { this.unbondDeviceslist.add(device); } }/** * 添加已绑定蓝牙设备到list集合 * * @param device */ public void addBandDevices(BluetoothDevice device) { System.out.println("已绑定设备名称：" + device.getName()); if (!this.bondDeviceslist.contains(device)) { this.bondDeviceslist.add(device); } }/** * 蓝牙广播接收器 */ private BroadcastReceiver receiver = new BroadcastReceiver() {ProgressDialog progressDialog = null; @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) { addBandDevices(device); } else { addUnbondDevices(device); } } else if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) { progressDialog = ProgressDialog.show(context, "请稍等...", "搜索蓝牙设备中...", true); } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED .equals(action)) { System.out.println("设备搜索完毕"); progressDialog.dismiss(); addUnbondDevicesToListView(); addBondDevicesToListView(); } } }; /** * 获取设备名称 * * @return String */ public String getDeviceName() { return devices.getName(); } /** * 连接蓝牙设备 */ public boolean connect() { if (!this.isConnection) { try { bluetoothSocket = this.devices .createRfcommSocketToServiceRecord(uuid); bluetoothSocket.connect(); outputStream = bluetoothSocket.getOutputStream(); this.isConnection = true; if (this.bluetoothAdapter.isDiscovering()) { System.out.println("关闭适配器！"); this.bluetoothAdapter.isDiscovering(); } } catch (Exception e) { Toast.makeText(this.context, "连接失败！", 1).show(); return false; } Toast.makeText(this.context, this.devices.getName() + "连接成功！", Toast.LENGTH_SHORT).show(); return true; } else { return true; } } /** * 断开蓝牙设备连接 */ public static void disconnect() { System.out.println("断开蓝牙设备连接"); try { bluetoothSocket.close(); outputStream.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); }} @Override public void onClick(View v) { switch (v.getId()) { case R.id.searchDevices: this.searchDevices(); break; case R.id.return_Bluetooth_btn: finish(); break; default: break; } } }

布局文件部分：

< RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/index" tools:context=".BluetoothActivity" > < LinearLayout android:id="@+id/openBluetooth_tb" android:layout_width="match_parent" android:layout_height="44dp" android:background="#24cf5f" android:orientation="horizontal" > < ImageView android:id="@+id/return_Bluetooth_btn" android:layout_width="match_parent" android:layout_height="20dp" android:layout_gravity="center" android:layout_weight="5" android:src="https://www.songbingjia.com/android/@drawable/back"/> < TextView android:layout_width="fill_parent" android:layout_height="44dp" android:layout_weight="1" android:gravity="center" android:paddingRight="40dp" android:text="@string/titie_activity_conn_blue_list" android:textColor="#FFFFFF" android:textSize="30px" /> < /LinearLayout> < LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@+id/openBluetooth_tb" android:orientation="vertical" > < LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" > < TextView android:visibility="gone" android:id="@+id/device_name" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="名称" android:textAppearance="?android:attr/textAppearanceLarge" /> < TextView android:visibility="gone" android:id="@+id/connect_state" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="42dp" android:text="状态" android:textAppearance="?android:attr/textAppearanceLarge" /> < /LinearLayout> < Button android:id="@+id/searchDevices" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="搜索设备" /> < View android:layout_width="match_parent" android:layout_height="3dp" android:layout_alignParentLeft="true" android:layout_below="@+id/searchDevices" android:background="@android:color/darker_gray" /> < LinearLayout android:id="@+id/linearLayout1" android:layout_width="match_parent" android:layout_height="150dp" android:orientation="vertical" > < TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="未配对设备" /> < ListView android:id="@+id/unbondDevices" android:layout_width="wrap_content" android:layout_height="wrap_content" /> < /LinearLayout> < View android:layout_width="match_parent" android:layout_height="3dp" android:layout_alignParentLeft="true" android:background="@android:color/darker_gray" /> < LinearLayout android:layout_width="match_parent" android:layout_height="190dp" android:orientation="vertical" > < TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="已配对设备" /> < ListView android:id="@+id/bondDevices" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/linearLayout1" > < /ListView> < /LinearLayout> < /LinearLayout> < /RelativeLayout>

通过以上两部分就可以实现连接蓝牙打印机的功能。