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私はMainActivityの2つの断片を含んでいます：画像をリストに表示するものと、クリックされたリストから画像を表示するものです。組み込み戻るボタンは、私のDetailFragmentから私のImageListFragmentに戻ってナビゲートするのにうまくいきますが、DetailFragmentの左上にImageListFragmentに戻ってナビゲートできるボタンもあります。私は通常getActivity().getSupportFragmentManager().popBackStack();を試しましたが、それは私をImageListFragmentに送り返しません。ここで前のフラグメントに戻る正しい方法は何ですか？
は私MainActivity次のとおりです。ここで
public class MainActivity extends AppCompatActivity implements ImageListFragment.OnGalleryImageSelected {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager()
.beginTransaction()
.add(R.id.root_layout, ImageListFragment.newInstance(), "galleryImageList")
.commit();
}
}
@Override
public void OnGalleryImageSelected(int imageResId) {
final ImageDetailFragment detailsFragment = ImageDetailFragment.newInstance(imageResId);
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.root_layout, detailsFragment, "galleryImageDetails")
.addToBackStack(null)
.commit();
}
}
はDetailFragmentです：
public class ImageDetailFragment extends Fragment {
private static final String IMAGE_ID = "imageResId";
public static ImageDetailFragment newInstance(int imageResId) {
final Bundle args = new Bundle();
args.putInt(IMAGE_ID, imageResId);
final ImageDetailFragment fragment = new ImageDetailFragment();
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_image_details, container, false);
final ImageView imageView = (ImageView) view.findViewById(R.id.gallery_image);
final Bundle args = getArguments();
Button button = (Button) view.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
System.out.println("button clicked");
FragmentManager fm = getActivity().getSupportFragmentManager();
fm.popBackStack();
}
});
imageView.setImageResource(args.getInt(IMAGE_ID));
return view;
}
}
そして、ここではImageListFragment次のとおりです。
public class ImageListFragment extends Fragment {
private int[] mImageResIds;
private OnGalleryImageSelected mListener;
public static ImageListFragment newInstance() {
return new ImageListFragment();
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
mListener = (OnGalleryImageSelected) context;
final Resources resources = context.getResources();
final TypedArray typedArray = resources.obtainTypedArray(R.array.images);
final int imageCount = 18;
mImageResIds = new int[imageCount];
for (int i = 0; i < imageCount; i++) {
mImageResIds[i] = typedArray.getResourceId(i, 0);
}
typedArray.recycle();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_image_list, container, false);
final Activity activity = getActivity();
final RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(activity));
recyclerView.setAdapter(new GalleryImageAdapter(activity));
return view;
}
class GalleryImageAdapter extends RecyclerView.Adapter<ViewHolder> {
private LayoutInflater mLayoutInflater;
public GalleryImageAdapter(Context context) {
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
return new ViewHolder(mLayoutInflater
.inflate(R.layout.recycler_view, viewGroup, false));
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, final int position) {
final int imageResId = mImageResIds[position];
viewHolder.setData(imageResId);
viewHolder.itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = FooPager.newIntent(getActivity(), position);
startActivity (intent);
}
});
}
@Override
public int getItemCount() {
return mImageResIds.length;
}
}
class ViewHolder extends RecyclerView.ViewHolder {
private ImageView mImageView;
private ViewHolder(View itemView) {
super(itemView);
mImageView = (ImageView) itemView.findViewById(R.id.gallery_image);
}
private void setData(int imageResId) {
mImageView.setImageResource(imageResId);
}
}
public interface OnGalleryImageSelected {
void OnGalleryImageSelected(int imageResId);
}
}