蓝牙是否开启

清单文件：

<uses-permission android:name="android.permission.BLUETOOTH" />//允许程序发现和配对蓝牙设备<uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />

public class MainActivity extends AppCompatActivity {

    //代替findviewByid;
    @BindView(R.id.btn_start)
    Button btnStart;
    @BindView(R.id.btn_stop)
    Button btnStop;
    @BindView(R.id.btn_discoverable)
    Button btnSearch;
    @BindView(R.id.btn_search)
    Button button4;
    private BluetoothAdapter bluetoothAdapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        //获取蓝牙适配器
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();


    }


    @OnClick({R.id.btn_start, R.id.btn_stop, R.id.btn_search, R.id.btn_discoverable})
    public void onViewClicked(View view) {
        switch (view.getId()) {
            case R.id.btn_start:
                bluetoothAdapter.enable();
                Toast.makeText(MainActivity.this,"蓝牙已打开",Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_stop:
                bluetoothAdapter.disable();
                Toast.makeText(MainActivity.this,"蓝牙已关闭",Toast.LENGTH_SHORT).show();
                break;
            case R.id.btn_discoverable:
                discoverableBluetooth();


                break;
            case R.id.btn_search:
                searchBluetooh();
                break;
        }
    }




    /**
     * 打开蓝牙的可检测性
     */
    private void discoverableBluetooth() {


        Intent intent = new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE);
        startActivityForResult(intent,0);
        Toast.makeText(MainActivity.this,"蓝牙可检测性已打开",Toast.LENGTH_SHORT).show();
    }


    //搜索蓝牙
    private void searchBluetooh() {
       //添加蓝牙可以被发现
        IntentFilter intentFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
        MBluetoothBroadCast mBluetoothBroadCast = new MBluetoothBroadCast();
        registerReceiver(mBluetoothBroadCast,intentFilter);


        IntentFilter intentFilter1 = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
        registerReceiver(mBluetoothBroadCast,intentFilter1);


        //开始找蓝牙设备
        bluetoothAdapter.startDiscovery();




    }


    //符合我注册的过滤器 ,就可以进入onReceive方法
        class MBluetoothBroadCast extends BroadcastReceiver{
        //一旦被发现或链接,我们就能能收到广播;
            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                //如果我们搜索到了其他的蓝牙,就会进入这个判断
                if( BluetoothDevice.ACTION_FOUND.equals(action)){
                    //得到搜索到的蓝牙设备
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);


                    if(device.getBondState()!=BluetoothDevice.BOND_BONDED){
                        //用设备获取蓝牙名字
                        System.out.println(device.getName()+",,,,,,,,,,,,,,,,");
                    }
                    //如果搜索完毕,会进入这个判断;
                }else if(BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)){
                    Toast.makeText(MainActivity.this, "已搜数完成", Toast.LENGTH_LONG).show();


                }


            }
        }




    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);


    }


}