我已在旧设备上测试了我的应用程序API版本和套接字消息显示。但在26+版本不起作用。我不明白为什么我的功能不适用于较新版本。
socket message receiver.Java
public class SocketMessageReceiver extends BroadcastReceiver {
interface ISocketMessageReceiver {
void sendSocketMessage(String socketMessage);
}
private static ISocketMessageReceiver iSocketMessageReceiver;
private final String TAG = "DEBUG";
@Override
public void onReceive(Context context, Intent intent) {
iSocketMessageReceiver.sendSocketMessage(intent.getBundleExtra(SocketService.BUNDLE_DATA_KEY_VALUE).getString(SocketService.BUNDLE_DATA_KEY_VALUE));
}
public void registerCallback(ISocketMessageReceiver iSocketMessageReceiver) {
this.iSocketMessageReceiver = iSocketMessageReceiver;
}
}
在我的MainActivity.java中
public void sendSocketMessage(String socketMessage) {
lblMessage.setText(socketMessage);
setNotificationMessage(socketMessage, "Порака") ;
}
更新:我在onCreate中添加了BroadcasReceiver,还需要进行哪些其他更改?
private static SocketMessageReceiver.ISocketMessageReceiver iSocketMessageReceiver;
private ISocketInterface iSocketInterface;
private SocketMessageReceiver socketMessageReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
BroadcastReceiver br = new SocketMessageReceiver();
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);
this.registerReceiver(br, filter);
iSocketMessageReceiver = this;
socketMessageReceiver = new SocketMessageReceiver();
socketMessageReceiver.registerCallback(iSocketMessageReceiver);
}
我不确定是否是这种情况,但您可能在清单中注册接收器。
Android O introduced注册广播接收器的一些限制 - 通常,除了一些exceptions之外,你不能在清单中注册隐式接收器。
因此,您必须在runtime期间注册接收器或坚持显式广播(这可以通过setting intent's target component完成)。
更新:
在这里您注册了一个接收器
this.registerReceiver(br, filter);
但之后你正在创建一个SocketMessageReceiver
的新实例并在其上调用registerCallback()
。
我想你想要做的就是在你注册接收广播的同一个实例上调用registerCallback()
。此外,由于你的ISocketMessageReceiver
实现了它,因此几乎不需要为Activity
设置变量。
您活动中的相关代码很可能是这样的
class MyActivity extends AppCompatActivity
implements SocketMessageReceiver.ISocketMessageReceiver {
private SocketMessageReceiver mSocketReceiver = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
mSocketReceiver = new SocketMessageReceiver();
mSocketReceiver.registerCallback(this);
IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
filter.addAction(Intent.ACTION_AIRPLANE_MODE_CHANGED);
registerReceiver(mSocketReceiver, filter);
}
}
当然,根据活动的生命周期回调,你必须小心并注销你作为SocketMessageReceiver
回调的活动。
无论如何,这段代码只是为了说明这个想法,所以我不建议在你的应用中使用它。