1
对于没有代码表示真诚的歉意，我要去参加婚礼，它是邮政编码或解释我的情况。Recycler Adapter上的Non Recycler Fragment调用方法？这甚至有可能吗？
我已经搜索过Stack并查看Recycler Adapter to Fragment（创建适配器）接口的许多帖子。
Fragment的一小部分（创建适配器）到适配器的帖子，但他们几乎不清楚。
我的情况是这样的：
在主要活动，当应用程序正在运行：
1）片段歌词（创建循环机适配器，它被设置成一个抒情回收站视图）
2）片段麦克风（语音识别麦克风功能和XML图标）。
我希望发生的是：
用户激活麦克风，能讲，那得到的数据传递到适配器的Java文件，并激活方法上适配器，造成对视觉变化RecyclerView Viewholder屏幕。
是的，我知道这可能是坏的体系结构。这是一个学校项目，我正在学习，而且我已经没有时间了。
*什么我可以迄今做*
我已经激活了预先制作的OnClick listerner的适配器（当在查看用户点击）和OnScroll为RecyclerView（用户滚动，它触发适配器中导致当前视图更改的方法）。
我已经为Microphone Fragment中的Passing Speech数据通过主要活动传递给Lyrics Fragment。
在Main上，我只是创建Lyrics Fragment的一个实例，然后在Lyrics Fragment上调用一个自定义方法来获取语音数据。像这样的东西。
LyricsFragment.TakeSpeechData(speech data);
*什么我的计划是...... *
当语音数据的歌词分段到来时，我以为我可以只写类似：
MyRecyclerAdapter.SomeMethodOnAdapter (speech data);
我现在可以免费入住。
它不工作
没有去。我在这里得到一个空指针异常。方法调用的MyRecyclerAdapter部分为null。我已经看过，不知道如何解决它。
我假设我引用原始适配器时创建的碎片放下RecyclerView并设置所有内容。这是Fragment Lyrics上的适配器的全局变量，我假设它“继续存在”。
我敢肯定我对基本的Java原则缺少了解，但我不知道该怎么做。
我已经花了数小时在这尝试，阅读，研究。我完全陷入困境。请帮忙。
编辑：这里是我的代码VerseFragment（我指的是作为“歌词”片段在我的文章）。注意这个片段是在屏幕上用recyclerView加载，创建和运行的。在用户使用也在屏幕上的micrphone片段之前，这已经创建。
public class VersesList extends Fragment {
@BindView(R.id.versesRecycleView) RecyclerView versesRecycleView;
@BindView(R.id.songNameTextView) TextView songName;
@BindView(R.id.artistTextView)TextView artistName;
private SharedPreferences mSharedPreferences;
LinearLayoutManager llm;
List verseList;
List finalModVerseList;
public VerseAdapter verseAdapter;
// temporary
private SharedPreferences.Editor editor;
public VersesList() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_verses_list, container, false);
ButterKnife.bind(this, view);
mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
editor=mSharedPreferences.edit();
displayArtistAndSongName();
lyricsToVerseList();
setVersesIntoRecyclerView();
setVersesScrollListener();
//temp
storeAllVerseLevels();
return view;
}
public static VersesList newInstance(String lyrics){
VersesList versesListFragment = new VersesList();
Bundle args = new Bundle();
args.putString("lyrics", lyrics);
versesListFragment.setArguments(args);
return versesListFragment;
}
public void lyricsToVerseList(){
String lyrics = getArguments().getString("lyrics", "");
verseList = new ArrayList<String>();
finalModVerseList = new ArrayList<String>();
verseList= Arrays.asList(lyrics.split("\n"));
int endOfFinalList=verseList.indexOf("...");
for (int i = 0; i < endOfFinalList; i++) {
if(!verseList.get(i).toString().equals("")){
String addThisVerse = verseList.get(i).toString();
//check on length of verse, if too short add next, check again
int numberOfWords = addThisVerse.split(" ").length;
while (numberOfWords < 10 && i < endOfFinalList) {
i++;
addThisVerse += " " + verseList.get(i).toString();
numberOfWords = addThisVerse.split(" ").length;
}
finalModVerseList.add(addThisVerse);
}
}
}
public void displayArtistAndSongName(){
String song = '"'+mSharedPreferences.getString(SONG_NAME, null)+'"';
String artist = "by "+mSharedPreferences.getString(ARTIST_NAME, null);
songName.setText(song);
artistName.setText(artist);
}
public void setVersesIntoRecyclerView(){
verseAdapter = new VerseAdapter(finalModVerseList, (MainActivity)getActivity(), versesRecycleView);
versesRecycleView.setAdapter(verseAdapter);
llm = new LinearLayoutManager(getActivity(),LinearLayoutManager.HORIZONTAL, false);
versesRecycleView.setLayoutManager(llm);
PagerSnapHelper helper = new PagerSnapHelper();
helper.attachToRecyclerView(versesRecycleView);
}
private void storeLevel(int indexNumber) {
editor.putInt(String.valueOf(indexNumber), 1).apply();
}
private void storeAllVerseLevels(){
for (int i=0; i< finalModVerseList.size();i++){
storeLevel(i);
}
for (int j=0; j< finalModVerseList.size();j++){
String level = String.valueOf(mSharedPreferences.getInt(String.valueOf(j), -1));
Log.d("In Shared Preferences ", "Verse "+j+" Level "+level);
}
}
public void checkSpeech(String text){
List<String> temp = new ArrayList<>();
temp.add("test");
VerseAdapter adapter = new VerseAdapter(temp, (MainActivity)getActivity(), versesRecycleView);
try {
adapter.resetVerse();
}catch (NullPointerException e){
Log.d("Null", e.toString());
}
}
public void setVersesScrollListener(){
versesRecycleView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == 0) {
verseAdapter.resetVerse();
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
}
});
}
}
当你调用从您的适配器方法，是。夏正在使用一个实例。MyRecyclerAdapter实例或类？要拨打someMethodOnAdpater(speechData)，您必须使用实例
如果您需要从创建它的片段中调用适配器方法，可以将其存储在像这样的变量中。
MyRecyclerAdapter adapter;
@Override
public View onCreateView(...) {
...
adapter = new MyRecyclerAdapter();
myRecyclerView.setAdapter(adapter);
...
}
public void takeSpeechData(String data) {
adapter.someMethodAdapter(data);
}
编辑：
我不知道为什么你的recyclerview使用相同的适配器被设置后空。调用适配器绝对有可能（I tested a basic example）。不过，我的示例中的代码与您之前所说的代码没有什么不同。我已提高您的问题的知名度。
**编辑：添加麦克风片段，它具有接口**
package com.blueoxgym.javainthedark.Fragments;
/**
* A simple {@link Fragment} subclass.
*/
public class MicFragment extends Fragment implements View.OnClickListener {
@BindView(R.id.progressBarMic)
ProgressBar micLevels;
@BindView(R.id.btn_mic)
ImageButton btnMicrophone;
private SpeechRecognizer speech = null;
private Intent recognizerIntent;
public final static String TAG = "In speech mode";
public FragmentManager fragmentManager;
private SharedPreferences mSharedPreferences;
private SharedPreferences.Editor mEditor;
private String trackName;
private String artistName;
private CallMainLoadVerseFragment loadVerseFragment;
private CheckSpeech checkSpeechOnVerse;
public MicFragment() {
// Required empty public constructor
}
public static MicFragment newInstance(){
MicFragment micFragment = new MicFragment();
return micFragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_mic, container, false);
ButterKnife.bind(this, view);
this.loadVerseFragment = (CallMainLoadVerseFragment) getActivity();
this.checkSpeechOnVerse = (CheckSpeech) getActivity();
btnMicrophone.setOnClickListener(this);
fragmentManager = getFragmentManager();
mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(getActivity());
mEditor = mSharedPreferences.edit();
return view;
}
@Override
public void onClick(View v) {
if (v == btnMicrophone) {
startSpeechToText();
}
}
class listener implements RecognitionListener {
...
@Override
public void onResults(Bundle results) {
String str = new String();
Log.d(TAG, "onResults " + results);
ArrayList<String> data = results.getStringArrayList(SpeechRecognizer.RESULTS_RECOGNITION);
String text = data.get(0).toLowerCase().replace("by","");
Fragment currentFragment = fragmentManager.findFragmentById(R.id.content_frame);
if (currentFragment.toString().contains("LyricSearch")){
searchForSong(text);
} else if (currentFragment.toString().contains("VersesList")){
-----------> Here it is called checkSpeechOnVerse.checkingSpeech(text);
}
}
}
public void startSpeechToText(){
btnMicrophone.setBackgroundResource(R.drawable.circle_green);
speech=SpeechRecognizer.createSpeechRecognizer(getContext());
speech.setRecognitionListener(new listener());
recognizerIntent= new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_PREFERENCE, "en-US");
recognizerIntent.putExtra(RecognizerIntent.EXTRA_CALLING_PACKAGE, getActivity().getPackageName());
recognizerIntent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
recognizerIntent.putExtra(RecognizerIntent.EXTRA_MAX_RESULTS, 5);
speech.startListening(recognizerIntent);
}
...
...
public interface CheckSpeech {
void checkingSpeech (String text);
}
}
MainActivity，实现CheckSpeech接口
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, MicFragment.CallMainLoadVerseFragment, MicFragment.CheckSpeech {
....
...
@Override
public void checkingSpeech(String text) {
VersesList versesList = new VersesList();
--------> Now, I'm pass data from Main to VersesList Fragment(it has the original Adapter)
versesList.checkSpeech(text);
}
VersesList片段，在这里我打电话适配器
public class VersesList extends Fragment {
....
private VerseAdapter verseAdapter;
setVersesIntoRecyclerView();
....
<---ADAPTER IS MADE AND SET HERE----.
public void setVersesIntoRecyclerView(){
verseAdapter = new VerseAdapter(finalModVerseList, (MainActivity)getActivity(), versesRecycleView);
versesRecycleView.setAdapter(verseAdapter);
llm = new LinearLayoutManager(getActivity(),LinearLayoutManager.HORIZONTAL, false);
versesRecycleView.setLayoutManager(llm);
PagerSnapHelper helper = new PagerSnapHelper();
helper.attachToRecyclerView(versesRecycleView);
}
public void checkSpeech(String text){
-------> NPE NPE
versesAdapter.someMethodOnAdapter(text);
}
public void setVersesScrollListener(){
versesRecycleView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (newState == 0) {
BUT THIS WORKS!!! No NPE. --------> verseAdapter.resetVerse();
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
// VerseAdapter.VerseViewHolder view = versesRecycleView.findViewHolderForAdapterPosition(llm.findFirstVisibleItemPosition());
}
});
}
在'checkSpeech（）'，你为什么要创建一个新的适配器？ –
在checkingSpeech（）中，您将实例化一个新的片段，但不会替换原始片段。该片段已创建，但未添加到容器中。如果您打算替换原始片段，则必须创建另一个事务，并用'transaction.replace（containerID，newFragment）' –
来替换容器。如果您想使用相同的片段，则可以像访问VersesList片段=（VersesList）FragmentManager.findFragmentById（containerId）.' –