Android 蓝牙开发——获取已配对蓝牙并显示

深碍√TFBOYSˉ_ 2022-06-08 13:29 850阅读 0赞

**activity\_blue\_paired.xml布**：里面有一个列表，用于显示所有已配对的设备

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@color/white" android:orientation="vertical">
        <TextView android:id="@+id/title" style="@style/text_18_ffffff" android:layout_width="fill_parent" android:layout_height="60dp" android:gravity="center" android:background="#84b9ff" android:text="已配对蓝牙列表" android:visibility="visible" />
        <FrameLayout android:layout_width="match_parent" android:layout_height="120dp">
            <ListView android:id="@+id/lv_blue_paired" android:layout_width="match_parent" android:layout_height="wrap_content" android:divider="#e6e7e9" android:dividerHeight="1dp" android:headerDividersEnabled="true" android:footerDividersEnabled="true" android:scrollbars="none" android:cacheColorHint="#00000000" android:listSelector="#00000000" />
        </FrameLayout>
    
    </LinearLayout>

**PairedBluetoothDialogAdapter.java**：listView的Adapter类，显示listView列表的每一项数据，其中有两个TextView控件，用来显示蓝牙名和蓝牙地址。还有一个BluetoothDevice对象，这个对象不是用来显示，是用来在列表点击时，返回蓝牙设备

public class PairedBluetoothDialogAdapter extends BaseAdapter { 
        public static final String TAG = "ListViewAdapter";
        private Context context;
        private List<HashMap> arrayList;
        public PairedBluetoothDialogAdapter(Context context, List<HashMap> arrayList){
            this.context = context;
            this.arrayList = arrayList;
        }
        @Override
        public int getCount() {
            return arrayList.size();
        }
    
        @Override
        public Object getItem(int position) {
            return arrayList.get(position);
        }
    
        @Override
        public long getItemId(int position) {
            return position;
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder  holder = null;
            LayoutInflater  mInflater = LayoutInflater.from(context);
            if(convertView == null)
            {
                holder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.item_paired_bluetooth, null);
                holder.tvName = (TextView)convertView.findViewById(R.id.item_name);
                holder.tvAddress = (TextView)convertView.findViewById(R.id.item_address);
                convertView.setTag(holder);
            }else {
                Log.d(TAG, "not_null " + position);
                holder = (ViewHolder)convertView.getTag();
            }
            holder.device = (BluetoothDevice) ((HashMap)arrayList.get(position)).get("blue_device");
            holder.tvName.setText((String)((HashMap)arrayList.get(position)).get("blue_name"));
            holder.tvAddress.setText((String)((HashMap)arrayList.get(position)).get("blue_address"));
            return convertView;
        }
        static class ViewHolder
        {
            public BluetoothDevice device;//不是用来显示，用来在item点击时返回连接对象
            public TextView tvName;
            public TextView tvAddress;
        }
    }

**item\_paired\_bluetooth.xml**：Adapter的布局文件

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/list_item" android:layout_width="match_parent" android:orientation="horizontal" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:layout_height="48dp">
        <TextView android:id="@+id/item_name" android:layout_width="wrap_content" android:layout_height="48dp" android:gravity="center_vertical" android:textSize="18sp"/>
        <TextView android:id="@+id/item_address" android:layout_width="match_parent" android:layout_height="48dp" android:gravity="center_vertical" android:lines="1" android:ellipsize="end" android:layout_marginLeft="10dp" android:textSize="16sp"/>
    </LinearLayout>

**java代码**：显示蓝牙列表,并对点击事件做相应，可以在点击列表中获取到返回的蓝牙设备，并对其进行操作

public class BluePairedActivity extends Activity { 
        public static final String TAG ="Chunna==BlueActivity";
        private List<HashMap> blueList;
        private HashMap blueHashMap;
        private ListView glvPaired;
        private BluetoothAdapter adapter;
        private PairedBluetoothDialogAdapter pairedAdapter;
    
        public static BluetoothSocket socket;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_blue_paired);
            initBlueTooth();
            glvPaired = (ListView)findViewById(R.id.lv_blue_paired);
            pairedAdapter = new PairedBluetoothDialogAdapter(this,blueList);
            pairedAdapter.notifyDataSetChanged();
    
            glvPaired.setAdapter(pairedAdapter);
            glvPaired.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    BluetoothDevice gDevice = (BluetoothDevice)(((HashMap)pairedAdapter.getItem(position)).get("blue_device"));
                    Log.d(TAG, "想要连接的远程主机：" + gDevice);
                    Log.d(TAG, "想要连接的远程主机：" + gDevice.toString());
    
                    //然后就可以连接或者做操作啦
                }
            });
        }
    
        private void initBlueTooth() {
            adapter = BluetoothAdapter.getDefaultAdapter();
            if (adapter != null) {
                if (!adapter.isEnabled()) {
                    adapter.enable();
                    //sleep one second ,avoid do not discovery
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
    
                Set<BluetoothDevice> devices = adapter.getBondedDevices();
                blueList = new ArrayList<HashMap>();
                Log.d(TAG,"获取已经配对devices"+devices.size());
                for (BluetoothDevice bluetoothDevice : devices)
                {
                    Log.d(TAG, "已经配对的蓝牙设备：");
                    Log.d(TAG, bluetoothDevice.getName());
                    Log.d(TAG, bluetoothDevice.getAddress());
                    blueHashMap = new HashMap();
                    blueHashMap.put("blue_device",bluetoothDevice);
                    blueHashMap.put("blue_name",bluetoothDevice.getName());
                    blueHashMap.put("blue_address",bluetoothDevice.getAddress());
                    blueList.add(blueHashMap);
                }
        }else{
                ToastUtil.getShortToastByString(this,"本机没有蓝牙设备");
            }
        }
    }