[英]Discovering Bluetooth Sample
我正在学习蓝牙应用程序,并且遇到的第一个示例似乎有据可查,但是我一生无法获得它来重现“搜索设备”部分,因此不胜感激。
public class MainActivity extends AppCompatActivity {
private Button onBtn, offBtn, listBtn, findBtn;
private TextView text;
private ListView myListView;
// Bluetooth global variables
private static final int REQUEST_ENABLE_BT = 1;
private BluetoothAdapter myBluetoothAdapter;
public Set<BluetoothDevice> pairedDevices;
private ArrayAdapter<String> BTArrayAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if(myBluetoothAdapter == null) {
Toast.makeText(getApplicationContext(),"Your device does not support Bluetooth",
Toast.LENGTH_LONG).show();
}
else
{
text = (TextView) findViewById(R.id.text);
onBtn = (Button)findViewById(R.id.turnOn);
offBtn = (Button)findViewById(R.id.turnOff);
listBtn = (Button)findViewById(R.id.paired);
findBtn = (Button)findViewById(R.id.search);
myListView = (ListView)findViewById(R.id.listView1);
// create the arrayAdapter that contains the bluetooth d evices, and set it to the ListView
BTArrayAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1);
myListView.setAdapter(BTArrayAdapter);
myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
String selectedFromList =(String) (myListView.getItemAtPosition(i));
Toast.makeText(getApplicationContext(),"Bluetooth remote device : " + selectedFromList,
Toast.LENGTH_LONG).show();
}
});
}
} // onCreate
public void on(View view){
if (!myBluetoothAdapter.isEnabled()) {
Intent turnOnIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOnIntent, REQUEST_ENABLE_BT);
Toast.makeText(getApplicationContext(),"Bluetooth turned on" ,
Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(getApplicationContext(),"Bluetooth is already on",
Toast.LENGTH_LONG).show();
}
}
public void off(View view){
myBluetoothAdapter.disable();
text.setText("Status: Disconnected");
Toast.makeText(getApplicationContext(),"Bluetooth turned off",
Toast.LENGTH_LONG).show();
}
public void list(View view){
// get paired devices
pairedDevices = myBluetoothAdapter.getBondedDevices();
// put it's one to the adapter
for(BluetoothDevice device : pairedDevices)
BTArrayAdapter.add(device.getName()+ "\n" + device.getAddress());
Toast.makeText(getApplicationContext(),"Show Paired Devices",
Toast.LENGTH_SHORT).show();
}
final BroadcastReceiver bReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
// When discovery finds a device
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
// add the name and the MAC address of the object to the arrayAdapter
BTArrayAdapter.add(device.getName() + "\n" + device.getAddress());
BTArrayAdapter.notifyDataSetChanged();
}
}
};
public void find(View view) {
if (myBluetoothAdapter.isDiscovering()) {
// the button is pressed when it discovers, so cancel the discovery
Toast.makeText(getApplicationContext(),"Bluetooth cancelled discovery" ,
Toast.LENGTH_LONG).show();
myBluetoothAdapter.cancelDiscovery();
} else {
BTArrayAdapter.clear();
Toast.makeText(getApplicationContext(),"Bluetooth discovery started" ,
Toast.LENGTH_LONG).show();
myBluetoothAdapter.startDiscovery();
registerReceiver(bReceiver, new IntentFilter(BluetoothDevice.ACTION_FOUND));
}
}
@Override
protected void onDestroy() {
super.onDestroy();
}
}
使用Oneplus3和2进行测试,除非已经配对,否则两个设备都找不到另一个。 我想看看是否可以像配对设备一样搜索并获取要填充到列表中的设备。
如果还有其他需要您输入的内容,请告诉我,希望您不要介意花时间为您提供帮助!
您需要向Manifest.xml
添加以下权限之一以查找设备:
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
要么
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
如果您使用的是API 23及更高版本,则必须确保已授予此权限,因为这是危险级别的权限。
从Android 6.0(API级别23)开始,用户在应用程序运行时(而不是在安装应用程序时)授予应用程序权限
请参阅本指南以请求许可。
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