禁用与互联网连接上的用户的app交互丢失android

Question

我正在创建一个必须具有互联网连接的应用， 如果连接丢失，我需要禁用与用户的任何交互。

我通过听android.net.conn.CONNECTIVITY_CHANGE来做到这一点。 效果很好。

我想设置一个警告对话框，并从BroadcastReceiver中将整个背景变灰。

无论如何要做到这一点？

感谢。

沙哈尔。

Answer 1

如果有人想知道， 我在我的主要活动中使用了广播接收器。

/*
    here we handle connection lost event
    show a popup over the screen to notify the user
 */
static final String ACTION = "android.net.conn.CONNECTIVITY_CHANGE";

public class ConnectionReceiver extends BroadcastReceiver {
    private static final String TAG = "ConnectionReceiver";

    private AlertDialog alertDialog;

    public ConnectionReceiver() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.net.conn.CONNECTIVITY_CHANGE")) {
            ConnectivityManager cm =
                    (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

            NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
            boolean isConnected = activeNetwork != null &&
                    activeNetwork.isConnectedOrConnecting();
            if (isConnected) {
                try {
                    if (alertDialog != null && alertDialog.isShowing())
                        alertDialog.dismiss();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            } else {
                if (alertDialog == null || !alertDialog.isShowing()) {
                    AlertDialog.Builder builder = new AlertDialog.Builder(context);
                    builder.setTitle("No internet connection");
                    builder.setMessage("check your connection.");
                    builder.setCancelable(false);
                    alertDialog = builder.create();
                    alertDialog.show();
                }
            }
        }
    }
}