Question

我正在使用 BroadcastReciever 来检查互联网连接，但它会在活动开始时调用。这是我的 BroadcastReceiver

public BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(final Context context, Intent intent) {
            connectivityManager = (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE );
            activeNwInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            boolean isWifiConnected = activeNwInfo != null && activeNwInfo.isConnectedOrConnecting();
            activeNwInfo = connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
            boolean isMobileNwConnected = activeNwInfo != null && activeNwInfo.isConnectedOrConnecting();
            try {
                if (isWifiConnected || isMobileNwConnected) {
                    Snackbar.make(cordinatorlayout, "Connection established", Snackbar.LENGTH_INDEFINITE)
                            .setAction("GO ONLINE", new View.OnClickListener() {
                                @Override
                                public void onClick(View view) {
                                    //Toast.makeText(context, "clicked", Toast.LENGTH_SHORT).show();
                                    finish();
                                    startActivity(getIntent());
                                }
                            }).show();
                }else {
                    Snackbar.make(cordinatorlayout, "You are Offline", Snackbar.LENGTH_INDEFINITE).show();
                }
            }catch (Exception e){
                e.printStackTrace();
            }
        }
    };
` and I have registered BroadcastReceiver inside oncreate() of MainActivity. My BroadcastReceiver is getting called but it is getting called at the start of activity.

Answer 1

当您设置BroadcastReceiver时，它最初会被调用一次。之后，它开始侦听Internet连接状态的变化，并在每次状态更改时调用。

如果您希望仅在Internet连接从DISCONNECTED更改为CONNECTED时才调用它，请创建一个保存当前状态的变量。当您在接收器中收到CONNECTED时，请检查变量是否为DISCONNECTED。如果是这样，做你想做的事;否则，什么都不做。

BroadcastReciever（检查互联网连接）在活动开始时被调用

1 个答案: