从gridview onClick

Question

我正在尝试在Gridview中显示特定目录中的本地图像，现在我想在新活动中单击gridview缩略图时显示完整图像。我是android的新手，并且已经在互联网上搜索了过去两天，找不到任何可以帮助我的东西。希望这里的任何人都能提供帮助。 这是我的代码。

PictureRecyclerAdapter.java

private ArrayList<File> filesList;
    private Activity activity;
    Context context;
 public class MyViewHolder extends RecyclerView.ViewHolder {
        ImageView thumbnail;
        ImageButton imageDownload, imageShare;

        public MyViewHolder(View itemView) {
            super(itemView);
            thumbnail = itemView.findViewById(R.id.pictures_thumbnail);
            imageDownload = itemView.findViewById(R.id.imageDownload);
            imageShare = itemView.findViewById(R.id.imageShare);
        }
    }

    public pictureRecyclerAdapter(ArrayList<File> filesList, Activity activity) {
        this.filesList = filesList;
        this.activity = activity;
    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View inflatedView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.pictures_item_view, parent, false);
        return new MyViewHolder(inflatedView);

    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {
        final File currentFile = filesList.get(position);
        Glide.with(activity).load(currentFile.getAbsolutePath())
                .skipMemoryCache( false )
                .crossFade().into(holder.thumbnail);
        holder.imageDownload.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                try {
                    copyFile(currentFile, new File( DIRECTORY_TO_SAVE_MEDIA_NOW+currentFile.getName()),activity);
                } catch (IOException e) {
                    e.printStackTrace();
                }

            }
        });
        holder.thumbnail.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                Intent go = new Intent(activity, ImageDetailsActivity.class);
                go.putExtra("image",  FileProvider.getUriForFile(context,BuildConfig.APPLICATION_ID + ".provider",currentFile));
                activity.startActivity(go);
            }
        });

这是我的PictureActivity

public class pictures extends Fragment {

    RecyclerView recyclerView;
    RecyclerView.LayoutManager layoutManager;
    private static final String IMAGE_LOCATION = "/storage/emulated/0/Image Folder/";

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


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_pictures, container, false);

        recyclerView=(RecyclerView)v.findViewById(R.id.pictures_recyclerView);
        layoutManager = new GridLayoutManager(getContext(),2);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.addItemDecoration(new ItemDecorationAlbumColumns(
                getResources().getDimensionPixelSize(R.dimen.photos_list_spacing),2));
        getListFiles(new File(IMAGE_LOCATION));
        pictureRecyclerAdapter ra = new pictureRecyclerAdapter(this.getListFiles(new File(IMAGE_LOCATION)), getActivity());
        recyclerView.setAdapter(ra);

        return v;
    }

    private ArrayList<File> getListFiles(File parentDir) {
        ArrayList<File> inFiles = new ArrayList<File>();
        File[] files;
        files = parentDir.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.getName().endsWith(".jpg") ||
                        file.getName().endsWith(".png") ||
                        file.getName().endsWith(".jpeg")) {
                    if (!inFiles.contains(file))
                        inFiles.add(file);
                }
            }
        }
        return inFiles;
    }



}

Answer 1

要在ImageDetailsActivity中显示图像，请按意图传递图像文件路径并开始活动。

void choiceAction(String choice) {
  setState((){
  switch (choice) {
    case ("Sign In"):
    //Navigate to the nextScreen value
      loggedIn = true;
      Navigator.push(
          context, MaterialPageRoute(builder: (context) => LoginScreen(0)));
      break;
    case ("Sign Out"):
      loggedIn = false;
      setSignedOutState(); //Sets state. So Sign Out to Sign in works just fine.
      break;
    default:
  }
  };
}

然后详细活动onCreate方法，获取路径并使用滑行或其他方式显示它。

holder.thumbnail.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent go = new Intent(activity, ImageDetailsActivity.class);
            go.putExtra("image",currentFile.getAbsolutePath());
            activity.startActivity(go);
        }
    });