我正在尝试修改作为 Android Studio 示例提供的 BluetoothLeGatt 项目,以便在每次读取特征时将 RSSI 值发送回主 Activity 以进行显示。我创建了一个新的 Intent 过滤器,但接收者从未收到 Intent 。我尝试将其添加到 list 文件中,但这也不起作用。
这是服务代码:
public class BluetoothLeService extends Service {
...
public final static String ACTION_GATT_CONNECTED =
"com.example.bluetooth.le.ACTION_GATT_CONNECTED";
public final static String ACTION_GATT_DISCONNECTED =
"com.example.bluetooth.le.ACTION_GATT_DISCONNECTED";
public final static String ACTION_GATT_SERVICES_DISCOVERED =
"com.example.bluetooth.le.ACTION_GATT_SERVICES_DISCOVERED";
public final static String ACTION_DATA_AVAILABLE =
"com.example.bluetooth.le.ACTION_DATA_AVAILABLE";
public final static String RSSI_DATA_AVAILABLE =
"com.example.bluetooth.le.RSSI_DATA_AVAILABLE";
public final static String EXTRA_DATA =
"com.example.bluetooth.le.EXTRA_DATA";
public final static String EXTRA_RSSI =
"com.example.bluetooth.le.EXTRA_RSSI";
@Override
public void onCharacteristicRead(BluetoothGatt gatt,
BluetoothGattCharacteristic characteristic,
int status) {
if (status == BluetoothGatt.GATT_SUCCESS) {
broadcastUpdate(ACTION_DATA_AVAILABLE, characteristic);
mBluetoothGatt.readRemoteRssi();
}
}
@Override
public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
final Intent intent = new Intent();
if (status == BluetoothGatt.GATT_SUCCESS) {
intent.putExtra(EXTRA_RSSI, String.valueOf(rssi));
intent.setAction(RSSI_DATA_AVAILABLE);
sendBroadcast(intent);
}
}
以及 Activity :
public class DeviceControlActivity extends Activity {
...
private final BroadcastReceiver mGattUpdateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final String action = intent.getAction();
if (BluetoothLeService.ACTION_GATT_CONNECTED.equals(action)) {
mConnected = true;
updateConnectionState(R.string.connected);
invalidateOptionsMenu();
} else if (BluetoothLeService.ACTION_GATT_DISCONNECTED.equals(action)) {
mConnected = false;
updateConnectionState(R.string.disconnected);
invalidateOptionsMenu();
clearUI();
} else if (BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED.equals(action)) {
// Show all the supported services and characteristics on the user interface.
displayGattServices(mBluetoothLeService.getSupportedGattServices());
} else if (BluetoothLeService.ACTION_DATA_AVAILABLE.equals(action)) {
displayData(intent.getStringExtra(BluetoothLeService.EXTRA_DATA));
} else if (BluetoothLeService.RSSI_DATA_AVAILABLE.equals(action)) {
updateRssi(intent.getStringExtra(BluetoothLeService.EXTRA_RSSI));
}
}
};
...
}
答案:
我必须在 Activity 中将操作添加到此方法:
private static IntentFilter makeGattUpdateIntentFilter() {
final IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_DISCONNECTED);
intentFilter.addAction(BluetoothLeService.ACTION_GATT_SERVICES_DISCOVERED);
intentFilter.addAction(BluetoothLeService.ACTION_DATA_AVAILABLE);
intentFilter.addAction(BluetoothLeService.RSSI_DATA_AVAILABLE);
return intentFilter;
}
最佳答案
覆盖Activity
中的onResume
,创建IntentFilter
,添加自定义操作,并注册广播接收器。
IntentFilter filter = new IntentFilter();
// call addAction for every action you want to receive in your BroadcastReceiver
filter.addAction(BluetoothLeService.ACTION_GATT_CONNECTED);
然后注册它
registerReceiver(mGattUpdateReceiver, filter);
覆盖 onPause 并调用 unregeisterReceiver
unregisterReceiver(mGattUpdateReceiver);
关于android - sendBroadcast 不适用于自定义 Intent 过滤器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31147610/