[英]Class extending BroadcastReceiver not working
我制作了一個幫助程序類,該類擴展了BroadcastReceiver以偵聽找到的BluetoothDevice和發現完成的意圖。 我有兩個通過傳遞處理程序使用此類的活動。 處理程序根據意圖接收消息。 我實例化類和registerReceiver像這樣:
來自mainActivity :
deviceHelper=new DevicesHelper(myHandler,DevicesHelper.REQUEST_DETECT_DEVICES_IN_RANGE);
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(deviceHelper, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(deviceHelper, filter);
if(myBluetoothAdapter.isDiscovering())myBluetoothAdapter.cancelDiscovery();
myBluetoothAdapter.startDiscovery();
從ListActivity :
deviceHelper=new DevicesHelper(deviceListHandler,DevicesHelper.REQUEST_DEVICE_LIST_ACTIVITY);
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
this.registerReceiver(deviceHelper, filter);
filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
this.registerReceiver(deviceHelper, filter);
DeviceHelper類 :
public class DevicesHelper extends BroadcastReceiver {
public final static int REQUEST_DEVICE_LIST_ACTIVITY=1;
public final static int REQUEST_DETECT_DEVICES_IN_RANGE=2;
Handler myHandler;
int requestCode;
public DevicesHelper(){
}
public DevicesHelper(Handler handler,int requestCode){
this.requestCode=requestCode;
myHandler=handler;
}
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
String action = intent.getAction();
// When discovery finds a device
BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
// Get the BluetoothDevice object from the Intent
switch(requestCode){
case REQUEST_DEVICE_LIST_ACTIVITY:
if (device.getBondState() != BluetoothDevice.BOND_BONDED) {
//newDevicesCount++;
String[] deviceInfo={device.getName(),device.getAddress()};
myHandler.obtainMessage(DeviceListActivity.MESSAGE_NEW_DEVICE,deviceInfo);
};
break;
case REQUEST_DETECT_DEVICES_IN_RANGE:
String[] deviceInfo={device.getName(),device.getAddress()};
myHandler.obtainMessage(StripChartRecorder.MESSAGE_NEW_DEVICE,deviceInfo);
break;
}
// When discovery is finished, change the Activity title
} else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
myHandler.obtainMessage(StripChartRecorder.MESSAGE_DISCOVERY_FINISHED);
}
}
處理程序 :
private final Handler myHandler=new Handler() {
@Override
public void handleMessage(Message msg) {
switch(msg.what) {
case MESSAGE_NEW_DEVICE:
doOtherStuff();
case MESSAGE_DISCOVERY_FINISHED:
dostuff();
}
break;
}}
我在這里想念什么嗎? 感謝您的幫助。
您需要sendMessage(Message msg)
,其中msg是通過obtainMessage
獲得的Message
。
問題是我如何處理從處理程序收到的消息。 結果表明,根據eclipse的說明,Set <>最初被設置為null,因此它從未添加從BroadcastReceiver幫助器類接收的設備。 感謝任何嘗試提供幫助的人。
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