在我们的应用程序中,我们希望能够不断检查连接状态,如果连接失效,则抛出Toast或某种UI来向用户指示它已经失效。我尝试在我们的Retrofit Api-Builder类中进行此操作,但似乎那里不支持Toast(会导致崩溃)。
iOS具有监控功能,但在Android上,我们必须手动检查。鉴于有多个活动,是否有一种简单/清晰的方式来在整个应用程序中执行此操作?
iOS具有监控功能,但在Android上,我们必须手动检查。鉴于有多个活动,是否有一种简单/清晰的方式来在整个应用程序中执行此操作?
NetworkStateChangeReceiver
。
NetworkStateChangeReceiver
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import static android.content.Context.CONNECTIVITY_SERVICE;
public class NetworkStateChangeReceiver extends BroadcastReceiver {
public static final String NETWORK_AVAILABLE_ACTION = "yourapp.packagename.NetworkAvailable";
public static final String IS_NETWORK_AVAILABLE = "isNetworkAvailable";
@Override
public void onReceive(Context context, Intent intent) {
Intent networkStateIntent = new Intent(NETWORK_AVAILABLE_ACTION);
networkStateIntent.putExtra(IS_NETWORK_AVAILABLE, isConnectedToInternet(context));
LocalBroadcastManager.getInstance(context).sendBroadcast(networkStateIntent);
}
private boolean isConnectedToInternet(Context context) {
try {
if (context != null) {
ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
return networkInfo != null && networkInfo.isConnected();
}
return false;
} catch (Exception e) {
Log.e(NetworkStateChangeReceiver.class.getName(), e.getMessage());
return false;
}
}
}
IntentFilter intentFilter = new
IntentFilter(NetworkStateChangeReceiver.NETWORK_AVAILABLE_ACTION);
LocalBroadcastManager.getInstance(this).registerReceiver(new
BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
boolean isNetworkAvailable = intent.getBooleanExtra(IS_NETWORK_AVAILABLE, false);
String networkStatus = isNetworkAvailable ? "Connected!" : "Disconnected!";
final SweetAlertDialog CC = new SweetAlertDialog(MainActivity.this, SweetAlertDialog.WARNING_TYPE);
CC.setTitleText("Network Status");
CC.setContentText(networkStatus);
CC.getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE, WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE);
CC.setCancelable(false);
CC.show();
您可以注册一个广播接收器,以便在连接状态发生变化时得到通知。
相关信息请参见 监控连接状态的更改
标题。
https://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html
CONNECTIVITY_ACTION
接收器将不会被调用。因此,您应该通过Context.registerReceiver
进行注册。所有这些都在我在原始答案中提供的文档中有说明。 - TrevJonez