Question

在我的应用程序中，它是一个简单的图像显示应用程序，我可以在其中添加来自外部存储的多个图像

添加图像时，添加图像花费的时间太长，有时还会发生$dm = $this->getDocumentManager(); $dm->createQueryBuilder('DnDReactivePandoraBundle:Property') ->remove() ->field('listingId')->notIn($ids) ->field('country')->equals($country) ->getQuery() ->execute();的错误。

如何解决此问题。请帮忙！

这是一些代码。...

我的 ImageCollection 活动

OutOfMemory

}

这是适配器类...

public class ImageCollection extends AppCompatActivity {
public static final String IMAGE_SHARED_PREFS = "com.example.animproject_IMAGE_SHARED_PREFS";
public static final String IMAGE_DATA_KEY = "com.example.animproject_IMAGE_DATA_KEY";

private static final int REQUEST_CODE = 1;
RecyclerView recyclerView;
ImageCollectionAdapter adapter;
List<ImageModelClass> imageList;
FloatingActionButton fab;
String imageStringConvert;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_image_collection);

    loadAlbumData();
    recyclerView = findViewById(R.id.imageCollectionRecyclerView);
    recyclerView.hasFixedSize();
    adapter = new ImageCollectionAdapter(imageList, ImageLoader.getInstance(), imageStringConvert);
    StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(2, GridLayoutManager.VERTICAL);
    recyclerView.setLayoutManager(staggeredGridLayoutManager);
    recyclerView.setAdapter(adapter);
    
    fab = findViewById(R.id.fabButton);
    fab.setOnClickListener(new View.OnClickListener() {
        @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
        @Override
        public void onClick(View view) {
            Intent gallery = new Intent(Intent.ACTION_PICK);
            gallery.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);
            gallery.setType("image/*");

            startActivityForResult(gallery, REQUEST_CODE);
        }
    });

}

public static String encodeTobase64(Bitmap bitmap) {
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);
    byte[] b = baos.toByteArray();
    return Base64.encodeToString(b, Base64.DEFAULT);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {

        assert data != null;
        ClipData clipData = data.getClipData();

        if (clipData != null) {
            for (int i = 0; i < clipData.getItemCount(); i++) {

                Uri imageUri = clipData.getItemAt(i).getUri();
                InputStream inputStream;

                try {
                    inputStream = getContentResolver().openInputStream(imageUri);
                    Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
                    ImageModelClass imageModelClass = new ImageModelClass();
                    imageStringConvert = encodeTobase64(bitmap);

                    imageModelClass.setImage(imageStringConvert);

                    imageList.add(imageModelClass);
                    adapter.notifyDataSetChanged();
                    saveGalleryData();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }

            }
        } else {
            Uri imageUri = data.getData();
            InputStream inputStream = null;
            try {
                assert imageUri != null;
                inputStream = getContentResolver().openInputStream(imageUri);

            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
            Bitmap bitmap = BitmapFactory.decodeStream(inputStream);
            imageStringConvert = encodeTobase64(bitmap);

            ImageModelClass imageModelClass = new ImageModelClass();
            imageModelClass.setImage(imageStringConvert);

            imageList.add(imageModelClass);
            adapter.notifyDataSetChanged();
            saveGalleryData();
        }
    }
}

private void saveGalleryData() {
    SharedPreferences preferences = getSharedPreferences(IMAGE_SHARED_PREFS, MODE_PRIVATE);
    SharedPreferences.Editor editor = preferences.edit();
    Gson gson = new Gson();
    String json = gson.toJson(imageList);
    editor.putString(IMAGE_DATA_KEY, json);
    editor.apply();
}

private void loadAlbumData() {
    SharedPreferences preferences = getSharedPreferences(IMAGE_SHARED_PREFS, MODE_PRIVATE);
    Gson gson = new Gson();
    Type type = new TypeToken<ArrayList<ImageModelClass>>() {
    }.getType();
    String data = preferences.getString(IMAGE_DATA_KEY, null);
    imageList = gson.fromJson(data, type);

    if (imageList == null) {
        imageList = new ArrayList<>();
    }
}

}

Answer 1

尝试在线程中加载图像

new Thread(new Runnable() {
        @Override
        public void run() {
            //load Image in onActivityResult
        }
    }).start();

您还可以使用Base64编码降低图像质量

bitmap.compress(Bitmap.CompressFormat.PNG,/*quality of image maximum is 100*/ 100, baos);

Answer 2

使用

放置您的onBindViewHolder

Handler mainHandler = new Handler(Looper.getMainLooper());

@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
    ImageModelClass currentImage = list.get(position);
    new Thread(new Runnable() {
        @Override
        public void run() {
            byte[] decodedByte = Base64.decode(currentImage.getImage(), 0);
            Bitmap bitmap = BitmapFactory.decodeByteArray(decodedByte, 0, decodedByte.length);
            mainHandler.post(new Runnable() {
               @Override
               public void run() {
                 holder.imageView.setImageBitmap(bitmap);
               }
            }
            
        }
    }).start();
   

}

添加图片时应用加载速度太慢

2 个答案: