Question

我有一个Activity和2个片段.Activity有一个BottomNavigationView，其中包含2个项目（片段）。在第一个片段中，用户通过EditText输入数据，然后单击按钮以发送 Localbroadcast 包含用户输入。但是当我尝试在“第二个片段”中接收它时，根本就不会检索它。但是，当我尝试在第一个片段中检索它时，就得到了数据。 BroadcastReceiver 被动态注册到第二个片段的 onCreateView 中。有人可以帮我解决这个问题吗？这真的困扰着我。期待您的帮助

Fragment1：

send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                input = user_input.getText().toString();
                if (input.trim().length() != 0 && !TextUtils.isEmpty(input)) {
                    Log.e("data",input);
                    Intent intent = new Intent("send");
                    intent.putExtra("sms", input);
                    LocalBroadcastManager.getInstance(getContext()).sendBroadcast(intent);

                }

Fragment2：

 if (smsreceiver==null)
        {
            smsreceiver=new BroadcastReceiver() {
                @Override
                public void onReceive(Context context, Intent intent) {
                    Log.e("Retreive","Retrieve");
                }
            };
            LocalBroadcastManager.getInstance(getContext()).registerReceiver(smsreceiver,new IntentFilter("send"));
        }

日志：

09-04 14:45:51.007 14829-14829/com.globemaster.com.messageapp E/data: cxs
09-04 14:45:51.857 14829-14829/com.globemaster.com.messageapp D/ViewRootImpl: ViewPostImeInputStage processPointer 0
09-04 14:45:51.937 14829-14829/com.globemaster.com.messageapp D/ViewRootImpl: ViewPostImeInputStage processPointer 1
09-04 14:45:51.977 14829-14829/com.globemaster.com.messageapp E/OnCreateView: Called
09-04 14:45:51.977 14829-14829/com.globemaster.com.messageapp D/TextView: setTypeface with style : 0
    setTypeface with style : 0
09-04 14:45:52.047 14829-14829/com.globemaster.com.messageapp E/Started: Called
09-04 14:45:52.047 14829-14829/com.globemaster.com.messageapp E/Onresume: called
09-04 14:45:52.077 14829-14829/com.globemaster.com.messageapp E/RecyclerView: No adapter attached; skipping layout

Answer 1

这不是使用广播的正确方法。由于第二个片段尚未开始，您无法接收广播。单击带有sms文本作为参数的发送按钮时，应更改为第二个片段。

尝试一下。它对我有用：

FirstFragment.java

send.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                input = user_input.getText().toString();
                if (!TextUtils.isEmpty(input)) {
                    Log.d("SendFrag", "sending : "+input);
                    // Set data into fragment
                    ReceiveSmsFragment fragment = new ReceiveSmsFragment();
                    Bundle arguments = new Bundle();
                    arguments.putString("sms", input);
                    fragment.setArguments(arguments);
                    // Change fragment with argument
                    FragmentTransaction transaction=getActivity().getSupportFragmentManager().beginTransaction();
                    transaction.replace(R.id.fragcontainer, fragment);
                    transaction.commit();

                } else {

                    Toast.makeText(getContext(), "Please enter a valid input", Toast.LENGTH_SHORT).show();
                }
                input = null;
            }
        });

和SecondFragment.java

@Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        Log.e("OnCreateView","Called");

        view = inflater.inflate(R.layout.receive_sms_frag, container, false);

        Bundle arguments = getArguments();
        String sms_string = arguments.getString("sms");
        if (sms == null) {
                    sms = new Sms();
        }
        sms.add(sms_string);
        Log.d("ReceiveFrag", "received : "+sms_string);

        return view;

    }

最后，您的短信课程很奇怪。我在这里发布更好的版本 Sms.java

public class Sms {
    private static ArrayList<String> sms_list;
    // Sms constructor with no private/public, it's a constructor !
    Sms()
    {
        sms_list = new ArrayList<>();
    }

    public void add(String sms)
    {

        sms_list.add(sms);
    }
    public String get(int position)
    {
        return sms_list.get(position);
    }
    public static int getListLength()
    {
        return sms_list.size();
    }
}

尝试一下，告诉我它是否有效：）

希望有帮助。

片段中未调用onReceive（）方法

1 个答案: