Question

我从片段A调用活动方法。工作正常。但是我如何设置一个字符串，然后打开片段B并从字符串中接收信息？

的活动：

public void test(){


Send_torrent_url_androidTv_Fragment fragment4 = new Send_torrent_url_androidTv_Fragment();
fragment4.onDestroyView();
FragmentTransaction fragmentTransaction4 = getSupportFragmentManager().beginTransaction();
fragmentTransaction4.addToBackStack(null);
getFragmentManager().popBackStack();
fragmentTransaction4.remove(fragment4);
fragmentTransaction4.replace(R.id.frame,fragment4);
fragmentTransaction4.commit();

}

片段A：

// Listview on item click listener
lv.setOnItemClickListener(new OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, final View view,
                            int position, long id) {
        // getting values from selected ListItem

        final String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString();

        final String id_stream = ((TextView) view.findViewById(R.id.id_streaming)).getText().toString();

        // Starting single contact activity

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity(), R.style.AppCompatAlertDialogStyle);
        builder.setTitle("Select");
        // builder.setMessage("Lorem ipsum dolor ....");
        builder.setItems(new CharSequence[]
                        {getString(R.string.play_video), getString(R.string.remove_video)},
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        // The 'which' argument contains the index position
                        // of the selected item
                        switch (which) {
                            case 0:
                                Activity activity = getActivity();
                                if(activity instanceof Main2Activity){
                                    Main2Activity myactivity = (Main2Activity) activity;
                                    myactivity.test();
                                }



                                break;
                            case 1:
                                // Snack Bar
                                Snackbar bar = Snackbar.make(view, R.string.confirm_delete_playlist, Snackbar.LENGTH_LONG)
                                        .setAction(R.string.yes, new View.OnClickListener() {
                                            @Override
                                            public void onClick(View v) {

                                                // ---Control remote api---
                                                new Thread() {

                                                    public void run() {

                                                        try {
                                                            HttpURLConnection.setFollowRedirects(false);
                                                            // note : you may also need
                                                            //HttpURLConnection.setInstanceFollowRedirects(false)

                                                            HttpURLConnection con =  (HttpURLConnection) new URL("http://xxxx/remote/delete-.php?id="+id_stream).openConnection();
                                                            con.setRequestMethod("HEAD");
                                                            if(con.getResponseCode() == HttpURLConnection.HTTP_OK) {

                                                                //--refresh fragment
                                                                FragmentTransaction ft = getFragmentManager().beginTransaction();
                                                                ft.detach(playlist_torrent.this).attach(playlist_torrent.this).commit();
                                                                //Fin refresh fragment

                                                                // startActivity(getIntent());
                                                                // finish();

                                         /*       final Handler handler = new Handler();
                                                Runnable refresh = new Runnable() {
                                                    @Override
                                                    public void run() {
                                                        new onPreExecute().execute();
                                                        handler.postDelayed(this, 60 * 1000);
                                                    }
                                                };
                                                handler.postDelayed(refresh, 60 * 1000);     */
                                                            }
                                                            else{

                                                            }
                                                        }
                                                        catch (Exception e) {
                                                            e.printStackTrace();
                                                        }
                                                    }
                                                }.start();
                                                // ----fin Control remote api----
                                            }
                                        });

                                bar.show();


                                break;
                        }
                    }
                });

到目前为止，一切进展顺利。但现在放置一个字符串包？

        Send_torrent_url_androidTv_Fragment fragment4 = new Send_torrent_url_androidTv_Fragment();





> Bundle bundle = new Bundle();
>        bundle.putString("token", description);
>        fragment4.setArguments(bundle);




        fragment4.onDestroyView();
        FragmentTransaction fragmentTransaction4 = getSupportFragmentManager().beginTransaction();
        fragmentTransaction4.addToBackStack(null);
        getFragmentManager().popBackStack();
        fragmentTransaction4.remove(fragment4);
        fragmentTransaction4.replace(R.id.frame,fragment4);
        fragmentTransaction4.commit();

当您输入“test”时，“description”是一段片段A而不起作用片段b：

Bundle args = getArguments();
                                String token = args.getString("token");

（错误）。你能做什么？谢谢

Answer 1

使用newInstance创建片段，它将用作带参数的构造函数。你可以找到很多samples in the documentation。

在您的片段类中，创建方法

public static Send_torrent_url_androidTv_Fragment newInstance(String param) {
        Send_torrent_url_androidTv_Fragment fragment = new Send_torrent_url_androidTv_Fragment();
        Bundle args = new Bundle();
        args.putString("somelabel", param);
        fragment.setArguments(args);
        return fragment;
}

在片段类的每个部分中，您都可以使用

访问此值

this.getArguments().getString("somelabel")

然后，您可以使用activity.test("bazinga")将值传递给片段，其中test就是这样的

    public void test(String param){
        Send_torrent_url_androidTv_Fragment fragment4 = Send_torrent_url_androidTv_Fragment.newInstance(param);
        //... more code...
    }

从调用活动方法来自片段内部放入字符串

1 个答案: