android - 如何等到用户启用移动数据并发送邮件？

Question

我有一个任务，我必须每天发送一次电子邮件。我使用由 AlarmManager 触发的 Service 来实现这一点。它工作正常。但问题是只有在移动数据可用时才会发送邮件。所以我尝试打开数据连接并发送邮件。移动数据已启用，但邮件未发送。我已经在这里发布了我尝试过的内容。有人请建议一种等待用户打开移动数据并发送邮件的方法。谢谢。

cm=(ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
        ni=cm.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
        isConnected=ni!=null&&ni.isConnected();

        Mail m=new Mail("xxxxxxxxx@gmail.com","xxxxxxx");
        String[] strTo={"xxxxxxxxx@gmail.com"};
        m.setTo(strTo);
        m.setFrom("xxxxxxxxxx@gmail.com");
        m.setSubject("Subject");
        m.setBody("Please find the attachment");

        try{
            m.addAttachment(Environment.getExternalStorageDirectory() + "/xxxxx/xxxxxx.xx");
            if (isConnected){
                m.send();
            }else {
                ConnectivityManager dataManager;
                dataManager  = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
                Method dataMtd = null;
                try {
                    dataMtd = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();
                }
                dataMtd.setAccessible(true);
                try {
                    dataMtd.invoke(dataManager, true);
                } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
                    e.printStackTrace();
                }
                NetworkInfo netInfo=dataManager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
                boolean isOnline=netInfo!=null&&netInfo.isConnected();
                if(isOnline){
                    if (m.send()){
                        ConnectivityManager dataManager1;
                        dataManager1  = (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);
                        Method dataMtd1 = null;
                        try {
                            dataMtd1 = ConnectivityManager.class.getDeclaredMethod("setMobileDataEnabled", boolean.class);
                        } catch (NoSuchMethodException e) {
                            e.printStackTrace();
                        }
                        dataMtd1.setAccessible(false);
                        try {
                            dataMtd1.invoke(dataManager1, false);
                        } catch (IllegalArgumentException | IllegalAccessException | InvocationTargetException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }catch (final Exception e){
            e.printStackTrace();
            Log.v("My_Service",e.toString());
        }

Answer 1

您需要让 BroadcastReceiver 监听数据连接的变化。请参阅 - http://developer.android.com/reference/android/content/BroadcastReceiver.html

检查此以获取特定于网络连接的引用 - Check INTENT internet connection