android 传统蓝牙开发(二):搜索蓝牙设备并展示

1.发现蓝牙设备,发现一个设备,会发送一条ACTION_FOUND广播,注册广播接收器,可获得对应蓝牙设备信息

intentFilter = new IntentFilter();

btReceiver = new MyBtReceiver();

intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED);

intentFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

intentFilter.addAction(BluetoothDevice.ACTION_FOUND);

MainActivity.this.registerReceiver(btReceiver, intentFilter);

 

/**

* 广播接受器

*/

private class MyBtReceiver extends BroadcastReceiver {

@Override

public void onReceive(Context context, Intent intent) {

String action = intent.getAction();

if (BluetoothAdapter.ACTION_DISCOVERY_STARTED.equals(action)) {

toast("开始搜索 ...");

} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {

toast("搜索结束");

} else if (BluetoothDevice.ACTION_FOUND.equals(action)) {

BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

if (isNewDevice(device)) {

deviceList.add(device);

listAdapter.notifyDataSetChanged();

Log.e("Tag", "---------------- " + device.getName());

}

}

}

}

/**

* 判断搜索的设备是新蓝牙设备,且不重复

* @param device

* @return

*/

private boolean isNewDevice(BluetoothDevice device){

boolean repeatFlag = false;

for (BluetoothDevice d :

deviceList) {

if (d.getAddress().equals(device.getAddress())){

repeatFlag=true;

}

}

//不是已绑定状态,且列表中不重复

return device.getBondState() != BluetoothDevice.BOND_BONDED && !repeatFlag;

}

 

 

 

2.点击,开始搜索蓝牙设备

mBtQuery.setOnClickListener(new View.OnClickListener() {

@RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)

@Override

public void onClick(View v) {

//搜索蓝牙设备

//如果点击了搜索,清空适配器,开始搜索蓝牙设备

if (bluetoothAdapter.isDiscovering()) {

bluetoothAdapter.cancelDiscovery();

}

//android 6.0以上设备发现新蓝牙时,需加入运行时权限,否则无法监听ACTION_FOUND广播

if (Build.VERSION.SDK_INT >= 6.0) {

ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},

Params.MY_PERMISSION_REQUEST_CONSTANT);

}

//已绑定的蓝牙设备

showBondDevice();

//发现新设备

bluetoothAdapter.startDiscovery();

 

listAdapter = new MyListAdapter();

resultList.setAdapter(listAdapter);

listAdapter.notifyDataSetChanged();

}

});

@Override

public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {

switch (requestCode) {

case PERMISSION_REQUEST_COARSE_LOCATION:

if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

// TODO request success

// 运行时权限已授权

}

break;

}

}

 

3.已绑定的蓝牙设备列表

private void showBondDevice() {

deviceList.clear();

Set tmp = bluetoothAdapter.getBondedDevices();

for (BluetoothDevice d :

tmp) {

deviceList.add(d);

}

}

 

4.设备列表的adapter

List deviceList = new ArrayList<>();

 

private class MyListAdapter extends BaseAdapter {

 

public MyListAdapter() {

}

 

@Override

public int getCount() {

return deviceList.size();

}

 

@Override

public Object getItem(int position) {

return deviceList.get(position);

}

 

@Override

public long getItemId(int position) {

return position;

}

 

@Override

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder viewHolder;

if (convertView == null) {

convertView = View.inflate(MainActivity.this, R.layout.layout_item_bt_device, null);

viewHolder = new ViewHolder();

viewHolder.deviceName = (TextView) convertView.findViewById(R.id.device_name);

viewHolder.deviceMac = (TextView) convertView.findViewById(R.id.device_mac);

viewHolder.deviceState = (TextView) convertView.findViewById(R.id.device_state);

convertView.setTag(viewHolder);

} else {

viewHolder = (ViewHolder) convertView.getTag();

}

int code = deviceList.get(position).getBondState();

String name = deviceList.get(position).getName();

String mac = deviceList.get(position).getAddress();

String state;

if (name == null || name.length() == 0) {

name = "未命名设备";

}

if (code == BluetoothDevice.BOND_BONDED) {

state = "已配对的设备";

viewHolder.deviceState.setTextColor(getResources().getColor(R.color.green));

} else {

state = "可用设备";

viewHolder.deviceState.setTextColor(getResources().getColor(R.color.red));

}

if (mac == null || mac.length() == 0) {

mac = "未知 mac 地址";

}

viewHolder.deviceName.setText(name);

viewHolder.deviceMac.setText(mac);

viewHolder.deviceState.setText(state);

return convertView;

}

 

}

 

/**

* 与 adapter 配合的 viewholder

*/

static class ViewHolder {

public TextView deviceName;

public TextView deviceMac;

public TextView deviceState;

}

 

4.1 R.layout.layout_item_bt_device

 

android:layout_width="match_parent"

android:layout_height="60dp">

 

android:id="@+id/device_iv"

android:layout_width="45dp"

android:layout_height="45dp"

android:layout_centerVertical="true"

android:src="@mipmap/ic_launcher_round"/>

 

android:layout_toRightOf="@id/device_iv"

android:layout_height="match_parent"

android:layout_width="match_parent"

android:orientation="horizontal">

 

android:id="@+id/device_info_ll"

android:orientation="vertical"

android:layout_width="0dp"

android:layout_weight="1"

android:layout_height="match_parent">

 

android:id="@+id/device_name"

android:layout_width="match_parent"

android:layout_height="0dp"

android:layout_weight="1"

android:gravity="center|start"

android:ellipsize="end"

android:textColor="@android:color/black"

android:textSize="17sp"

android:paddingTop="10dp" />

 

android:id="@+id/device_mac"

android:layout_width="match_parent"

android:layout_height="0dp"

android:gravity="center|start"

android:layout_weight="1"

android:ellipsize="end"

android:textSize="12sp"

android:paddingBottom="10dp" />

 

android:id="@+id/device_state"

android:layout_width="80dp"

android:layout_height="match_parent"

android:textColor="@color/blue"

android:gravity="center"

android:textStyle="bold"/>

 

 

(一)打开/关闭蓝牙设备:https://blog.csdn.net/lumingzhang/article/details/89922173

(三)蓝牙设备连接及通信:https://blog.csdn.net/lumingzhang/article/details/89922252

 

 

 

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