每当我的AudioRecorder创建一个新文件时，我只是试图更新RecyclerView。我的recyclerview是在一个片段上创建的（我们称其为片段A）。我还有另一个片段，每当它被调用时，就开始记录音频（我们称之为片段B）。
我正在使用片段B中的接口来告知片段A适配器应该更新数据。
我已经使用“ UpdateData（）”方法创建了一个公共接口。
当在片段B上按下“停止记录”按钮时，我正在调用接口，以便它可以与主要片段（片段A）进行通信并更新数据。
到目前为止，Android Studio告诉我，即使我在“附加条件”方法中定义了接口变量，该变量还是null。
[“ On Attach”方法上的上下文变量是指我的主要活动，而不是指recyclerview所在的当前片段。这是一个问题，所以我对其进行了更改，以便他获取片段。但是，它并没有阻止应用程序崩溃。
//Here's my main Fragment (Fragment A)
public class RecordsFragment extends Fragment implements Records_BottomSheet_Dialog.BottomSheet_Interface {
private static final int PERMISSION_REQUEST = 1000;
static ArrayList<String> mNames = new ArrayList<>();
static ArrayList<String> NbFiles = new ArrayList<>();
static ArrayList<String> PathFiles = new ArrayList<>();
static int NumberFile= 0;
static RecyclerView recyclerView;
static RecyclerViewAdapter adapter;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_records, container, false);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//Check if we have the permission to read storage
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
//We don't have the permission, so request it.
ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, PERMISSION_REQUEST);
}
if (ContextCompat.checkSelfPermission(getActivity(), Manifest.permission.RECORD_AUDIO)
!= PackageManager.PERMISSION_GRANTED) {
//We don't have the permission, so request it.
ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.RECORD_AUDIO}, PERMISSION_REQUEST);
}
//We already have permission
else {
permissionExists();
}
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
initRecyclerView(view, recyclerView, adapter);
}
@Override
public void onResume() {
super.onResume();
((FileAndDirectoryActivity) getActivity())
.setButton("Créer un nouvel Enregistrement", true);
}
public void initRecyclerView(View v, RecyclerView recyclerView, RecyclerView.Adapter adapter) {
recyclerView = v.findViewById(R.id.recyclerview);
adapter = new RecyclerViewAdapter(mNames, getActivity().getApplicationContext());
adapter.notifyDataSetChanged();
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity().getApplicationContext()));
}
private void permissionExists() {
mNames.clear();
PathFiles.clear();
NbFiles.clear();
String path = Environment.getExternalStorageDirectory().toString() + "/Rapture";
File directory = new File(path);
boolean success = true;
if (!directory.exists()) {
success = directory.mkdirs();
}
if (success) {
File[] arrayFiles = directory.listFiles();
for (File file : arrayFiles) {
mNames.add(file.getName());
PathFiles.add(file.getPath());
NbFiles.add(file.getName());
}
}
}
@Override
public void UpdatetheData(boolean state) {
if (state==true){
adapter.notifyDataSetChanged();
}
}
}
//Here's my other fragment (the one that records upon called, Fragment B)
public class Records_BottomSheet_Dialog extends BottomSheetDialogFragment{
private MediaRecorder AudioRecorder;
private String outputFile;
private FloatingActionButton stop;
private static final int PERMISSION_REQUEST = 1000;
private Integer FileSize = RecordsFragment.NbFiles.size();
private BottomSheet_Interface bts;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
permissionExists();
View view = inflater.inflate(R.layout.modal_records, container, false);
FloatingActionButton stop_record = view.findViewById(R.id.stop);
stop_record.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
bts.UpdatetheData(true);
AudioRecorder.stop();
AudioRecorder.release();
AudioRecorder = null;
Toast.makeText(getActivity(), "Fin de l'enregistrement", Toast.LENGTH_SHORT).show();
dismiss();
}
});
return view;
}
public interface BottomSheet_Interface{
void UpdatetheData(boolean state);
}
@Override
public void onAttach(@NonNull Context context) {
super.onAttach(context);
try {
bts = (BottomSheet_Interface) getActivity().getFragmentManager().findFragmentById(R.id.fragment_container);
} catch (ClassCastException e){
throw new ClassCastException(context.toString()
+" must implement BottomSheet_Interface");
}
}
private void permissionExists() {
AudioRecorder = new MediaRecorder();
AudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
AudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
if (FileSize != 0) {
for (int i = 0; i < FileSize + 1; i++) {
String path = Environment.getExternalStorageDirectory().toString() + "/Rapture/Recording(" + Integer.toString(i) + ").mp3";
File f = new File(path);
if (!f.exists()) {
AudioRecorder.setOutputFile(Environment.getExternalStorageDirectory().toString() + "/Rapture/Recording(" + Integer.toString(i) + ").mp3");
break;
}
}
} else {
AudioRecorder.setOutputFile(Environment.getExternalStorageDirectory().toString() + "/Rapture/Recording(0).mp3");
}
AudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
Toast.makeText(getActivity(), "Enregistrement", Toast.LENGTH_SHORT).show();
try {
AudioRecorder.prepare();
AudioRecorder.start();
} catch (IllegalStateException ie) {
} catch (IOException ioe) {
}
}
}
问题是当我使用AudioRecorder录制多个录音时，如果RecyclerView没有更新，则如果我重试，则应用程序崩溃。因此，每次用户停止记录时，我都需要更新RecyclerView适配器。
我希望RecyclerView直接显示创建的新文件，但我必须先导航到其他选项卡，然后再返回到音频选项卡以对其进行更新。