import android.bluetooth.BluetoothAdapter;
【BluetoothAdapter.java】
@SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
public static final String
ACTION_STATE_CHANGED = "android.bluetooth.adapter.action.STATE_CHANGED";//当前action动作
/**
* Used as an int extra field in {@link #ACTION_STATE_CHANGED}
* intents to request the current power state. Possible values are:
* {@link #STATE_OFF},
* {@link #STATE_TURNING_ON},
* {@link #STATE_ON},
* {@link #STATE_TURNING_OFF},
*/
//intent.getIntExtra 参数
public static final String EXTRA_STATE = "android.bluetooth.adapter.extra.STATE";//当前状态
public static final String EXTRA_PREVIOUS_STATE =
"android.bluetooth.adapter.extra.PREVIOUS_STATE";//上一个状态
public static final int STATE_OFF = 10;
public static final int STATE_TURNING_ON = 11;
public static final int STATE_ON = 12;
public static final int STATE_TURNING_OFF = 13;
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
boolean bluetoothEnable = bluetoothAdapter == null ? false : bluetoothAdapter.isEnabled();
if (bluetoothEnable) {//判断蓝牙是否开启
//处理逻辑
}
监听蓝牙广播：
IntentFilter bt = new IntentFilter();
bt.addAction(BluetoothAdapter.ACTION_STATE_CHANGED );
mContext.registerReceiver(mReceiver, bt);
private final BroadcastReceiver mReceiver = new BroadcastReceiver() {@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothAdapter.ACTION_STATE_CHANGED .equals(action)) {
int state = intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, BluetoothAdapter.ERROR);//监听当前蓝牙状态
switch (state) {
case BluetoothAdapter.STATE_OFF:
//添加其他处理逻辑，比如亮灭led灯，密码弹窗，控制可用禁用等
break;
case BluetoothAdapter.STATE_ON:
//添加其他处理逻辑
break;case BluetoothAdapter.STATE_TURNING_OFF:
break;
case BluetoothAdapter.STATE_TURNING_ON:
break;
}
}
}
};
最好的监听地方是状态栏上：
/vendor/mediatek/proprietary/packages/apps/SystemUI/src/com/android/systemui/statusbar/phone/StatusBar.java 的start()方法里面注册广播
其实，对应如此，NFC也可以这样！NfcAdapter