Question

在我的应用程序中，当从1902年收到短信时，我希望AlertDialog能够实现。我有BroadcastReciever Running

public class IncomingSms extends BroadcastReceiver {

// Get the object of SmsManager
final SmsManager sms = SmsManager.getDefault();

public void onReceive(Context context, Intent intent) {

    // Retrieves a map of extended data from the intent.
    final Bundle bundle = intent.getExtras();

    try {

        if (bundle != null) {

            final Object[] pdusObj = (Object[]) bundle.get("pdus");

            for (int i = 0; i < pdusObj.length; i++) {

                SmsMessage currentMessage = SmsMessage.createFromPdu((byte[]) pdusObj[i]);
                String phoneNumber = currentMessage.getDisplayOriginatingAddress();

                String message = currentMessage.getDisplayMessageBody();

                Log.i("SmsReceiver", "senderNum: " + phoneNumber + "; message: " + message);

                if (TextUtils.equals(currentMessage.getOriginatingAddress(), "1902")) {
                    // Show Alert

                    MainActivity actv1= new MainActivity();
                    actv1.Dialog(message);
                }

            } // end for loop
        } // bundle is null


    } catch (Exception e) {
        Log.e("SmsReceiver", "Exception smsReceiver" +e);

    }
}

在主要活动中我有Void：

 public void Dialog(String message) {
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
    builder.setTitle("Title123");
    builder.setMessage(message);
    builder.setPositiveButton("HEY!", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int id) {

        }
    });
    Log.i("test2", message);
    builder.show();
}

但是当收到短信没有发生任何事情时，专家可以告诉我们有什么问题吗？

Answer 1

您已创建MyActivity以用作上下文而非已提供的上下文

if (TextUtils.equals(currentMessage.getOriginatingAddress(), "1902")) 
{
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("Title123");
    builder.setMessage(message);
    builder.setPositiveButton("HEY!", new DialogInterface.OnClickListener() 
    {
        public void onClick(DialogInterface dialog, int id) 
        {

        }
    });
    builder.show();
}

注意

MainActivity actv1= new MainActivity(); // This is wrong

您无法使用新操作员自行创建任何活动，Android操作创建活动只需传递创建活动的意图。

收到消息后启动AlertDialog

1 个答案: