如何使用recyclerview将图库中的所有图像获取到我的应用程序？以及如何在onbind支架中设置图像以加载图库图像

Question

  public void onBindViewHolder(MyAdapter.MyViewHolde holder, int position) {
        //how to set image for loading the images for gallery 



----------


}

//以及如何在主要活动中从图库获取图像的代码

Answer 1

您必须首先从活动中的图库中获取所有图像，然后必须将图像列表设置为

RecyclerView

使用以下方法获取所有图像-

    private ArrayList<String> getAllShownImagesPath(Activity activity) {
        Uri uri;
        Cursor cursor;
        int column_index_data, column_index_folder_name;
        ArrayList<String> listOfAllImages = new ArrayList<String>();
        String absolutePathOfImage = null;
        uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

        String[] projection = { MediaColumns.DATA,
                MediaStore.Images.Media.BUCKET_DISPLAY_NAME };

        cursor = activity.getContentResolver().query(uri, projection, null,
                null, null);

        column_index_data = cursor.getColumnIndexOrThrow(MediaColumns.DATA);
        column_index_folder_name = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
        while (cursor.moveToNext()) {
            absolutePathOfImage = cursor.getString(column_index_data);

            listOfAllImages.add(absolutePathOfImage);
        }
        return listOfAllImages;
    }

现在将图像列表设置为

RecyclerView

适配器。

以这个RecyclerView示例作为参考来设置所有图库图像。

Answer 2

公共类 GalleryFragment 扩展 Fragment {

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

private Context context;
private RecyclerView recyclerView;
ArrayList<String> imageData;
MyAdapter adapter;

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_gallery, container, false);
    context = getActivity();

    recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
    recyclerView.setHasFixedSize(true);

    RecyclerView.LayoutManager layoutManager = new GridLayoutManager(getActivity(), 3);
    recyclerView.setLayoutManager(layoutManager);

    MyTask myTask = new MyTask();
    myTask.execute();

    return view;
}

private class MyTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... params) {
        imageData = getAllShownImagesPath(getActivity());
        Log.e("imageData: ", String.valueOf(imageData.size()));
        return null;
    }

    @Override
    protected void onPostExecute(Void aVoid) {
        super.onPostExecute(aVoid);
        adapter = new MyAdapter(imageData, getActivity());
        recyclerView.setAdapter(adapter);

    }

}

private ArrayList<String> getAllShownImagesPath(Activity activity) {
    Uri uri;
    Cursor cursor;
    int column_index_data, column_index_folder_name;
    ArrayList<String> listOfAllImages = new ArrayList<String>();
    String absolutePathOfImage = null;
    uri = android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

    String[] projection = {MediaStore.MediaColumns.DATA,
            MediaStore.Images.Media.BUCKET_DISPLAY_NAME};

    cursor = activity.getContentResolver().query(uri, projection, null,
            null, null);

    column_index_data = cursor.getColumnIndexOrThrow(MediaStore.MediaColumns.DATA);
    column_index_folder_name = cursor
            .getColumnIndexOrThrow(MediaStore.Images.Media.BUCKET_DISPLAY_NAME);
    while (cursor.moveToNext()) {
        absolutePathOfImage = cursor.getString(column_index_data);

        listOfAllImages.add(absolutePathOfImage);
    }
    return listOfAllImages;
}

}

Answer 3

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolde> {
    Context context;
    private ArrayList<String> imageData = new ArrayList<String>();


    public MyAdapter(ArrayList<String> imageData, FragmentActivity activity) {
        this.imageData = imageData;
        this.context = activity;
    }

    @Override
    public MyAdapter.MyViewHolde onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.inflate_single_image_row, parent, false);

        return new MyViewHolde(itemView);
    }

    @Override
    public void onBindViewHolder(MyAdapter.MyViewHolde holder, int position) {
        String data = imageData.get(position);
        if (data != null){
            Glide.with(context).load(data).into(holder.singleImageView);

        }else {
            Toast.makeText(context, "Images Empty", Toast.LENGTH_SHORT).show();
        }


    }

    @Override
    public int getItemCount() {
        return imageData.size();
    }

    public class MyViewHolde extends RecyclerView.ViewHolder {
        ImageView singleImageView;

        public MyViewHolde(View itemView) {
            super(itemView);
            singleImageView = (ImageView) itemView.findViewById(R.id.singleImageView);
        }
    }
}

Answer 4

这个获取Android上的照片库列表将帮助您.. 我想在此处添加的一件事是您应该在 AsyncTask 或线程内添加检索数据的库。在 UI 线程中获取图库数据并不是一个好习惯，因为如果图库图像太大，则可能会因 UI 线程中的处理而出现 ANR。

Answer 5

 private void getImageData() {
        Uri uri= MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) 
{
            Cursor cursor= getContentResolver().query(uri
                                                     ,null
                                                     ,null
                                                     ,null);
            if (cursor != null && cursor.moveToFirst())
            {
                do{
                    String path=cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
                    String date
                    =cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATE_TAKEN));
                    String imagename
                    =cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DISPLAY_NAME));
                    Image_ModelClass modelClass=new Image_ModelClass(path,date,imagename);
                    image_list.add(modelClass);
                }while (cursor.moveToNext());
            }
            cursor.close();
        }