具有回收器视图通信的安卓片段

Question

我有一个包含回收器视图的ListFragment，我想在单击项目时制作它DetailFragment在多窗格布局中显示它旁边的 我知道如何创建多窗格布局，但我不知道如何在片段之间发送数据，因为我不知道在哪里初始化单击以发送数据， 我应该在哪里初始化单击时，以便它将数据从ListFragment传递到DetailFragment并显示它？*注意：我从对话框片段中获取数据

主活动

public class MainActivity extends AppCompatActivity  {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

FragmentManager fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.fragment_list_container);
if (fragment == null) {
fragment = new ListFragment();
fm.beginTransaction()
.add(R.id.fragment_list_container, fragment)
.commit();
}
}
}

列表片段

public class ListFragment extends Fragment implements MyDialog.OnInputSelected {

@Override
public void sendInput(String title, Uri imageUri) {
Wallpaper wallpaper = new Wallpaper(title, imageUri);
wallpaperList.add(wallpaper);
passWallpaper.passWallpaperMethod(wallpaper);
}
private List<Wallpaper> wallpaperList;
private RecyclerViewAdapter recyclerViewAdapter;
private RecyclerView recyclerView;
private FloatingActionButton fabOpenDialog;

public ListFragment() {
// Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_list, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
fabOpenDialog = view.findViewById(R.id.fab_open_dialog);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
fabOpenDialog.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MyDialog dialog = new MyDialog();
dialog.setTargetFragment(ListFragment.this, 1);
dialog.show(getFragmentManager(), "MyDialog");
}
});
wallpaperList = new ArrayList<>();

recyclerView = getView().findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerViewAdapter = new RecyclerViewAdapter(wallpaperList, getActivity());
recyclerView.setAdapter(recyclerViewAdapter);
}

}

回收器视图适配器

public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private List<Wallpaper> wallpaperList;
private Context context;
public RecyclerViewAdapter(List<Wallpaper> wallpaperList, Context context) {
this.wallpaperList = wallpaperList;
this.context = context;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.recycler_row, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
Wallpaper wallpaper = wallpaperList.get(position);
holder.iv.setImageURI(wallpaper.getImageUrl());
holder.tvTitle.setText(wallpaper.getTitle());

}
@Override
public int getItemCount() {
return wallpaperList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public View view;
public ImageView iv;
public TextView tvTitle;
public ViewHolder(@NonNull View itemView) {
super(itemView);
view = itemView;
iv = itemView.findViewById(R.id.row_iv);
tvTitle = itemView.findViewById(R.id.row_tv_title);

}
}
}

详情活动

public class DetailsActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);

FragmentManager fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.details_container);
if (fragment == null) {
fragment = new DetailsFragment();
fm.beginTransaction()
.add(R.id.details_container, fragment)
.commit();
}
}

}

详情碎屑

public class DetailsFragment extends Fragment {
private TextView tvTitle;
private ImageView ivWallpaper;
public DetailsFragment() {
// Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_details, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
tvTitle = view.findViewById(R.id.fragment_details_tv_title);
ivWallpaper = view.findViewById(R.id.details_fragment_iv_wallpaper);
}

对话片段

public class MyDialog extends DialogFragment implements View.OnClickListener {
public interface OnInputSelected {
void sendInput(String title, Uri imageUri);
}
public OnInputSelected onInputSelected;
@Override
public void onAttach(@NonNull Context context) {
super.onAttach(context);
try {
// "getTargetFragment()" instead of "getActivity()"
onInputSelected = (OnInputSelected) getTargetFragment();
} catch (ClassCastException e) {
Log.d("DialogFragment", "Class Cast Exception: " + e.getMessage());
}
}
TextView yes, no;
private EditText etTitle;
private ImageView imageView;
private Uri imageUri;

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
setCancelable(false);
return inflater.inflate(R.layout.dialog_add_wallpaper, null);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
yes = view.findViewById(R.id.dialog_tv_ok);
no = view.findViewById(R.id.dialog_tv_cancel);
imageView = view.findViewById(R.id.dialog_iv_add_image);
imageView.setOnClickListener(this);
yes.setOnClickListener(this);
no.setOnClickListener(this);
etTitle = view.findViewById(R.id.et_add_title);
}
@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
Dialog dialog = super.onCreateDialog(savedInstanceState);
dialog.setTitle("Title testing");
return dialog;
}
@Override
public void onClick(View v) {
if (v.getId() == R.id.dialog_tv_ok) {
onInputSelected.sendInput(etTitle.getText().toString().trim(), imageUri);
dismiss();
} else if (v.getId() == R.id.dialog_tv_cancel) {
onInputSelected.sendInput("got canceled", null);
dismiss();
} else {
Intent imageIntent = new Intent(Intent.ACTION_GET_CONTENT);
imageIntent.setType("image/*");
startActivityForResult(imageIntent, 1);
}
}

@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1 && resultCode == Activity.RESULT_OK && data != null &&
data.getData() != null) {
imageUri = data.getData();
imageView.setImageURI(imageUri);
}
}
}

Answer 1

您可以在RecyclerViewAdapter和内部初始化clickListeneronBindViewHolder，如下所示：

holder.iv.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
((MainActivity) view.getContext()).getFragmentManager().beginTransaction()
.replace(R.id.fragment_list_container, new DetailsFrgament())
.commit();
}
});

对于传输数据，您可以使用Bundle