在RecyclerView中缓存应用程序后图像

Question

我的应用程序正常工作，但在将重新调整大小的图像包含在RecyclerView后变得非常慢，为什么会发生这种情况？

public class AlunoAdapter extends RecyclerView.Adapter<AlunoAdapter.AlunoViewHolder> { 
    private List<Aluno> alunos; 
    private Context context; 
    private static ItemClickListener clickListener; 
    private static LongItemClickListener longItemClickListener; 

    public AlunoAdapter(List<Aluno> Alunos, Context context) { 
     this.alunos = Alunos; 
     this.context = context; 
    } 

    @Override 
    public AlunoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
     View view = LayoutInflater.from(context).inflate(R.layout.aluno_celula, parent, false); 
     return new AlunoViewHolder(view); 
    } 

    @Override 
    public void onBindViewHolder(AlunoViewHolder holder, int position) { 
     Aluno aluno = alunos.get(position); 
     holder.nome.setText(aluno.getNome()); 

     if (aluno.getFoto() != null) { 
      Bitmap fotoAluno = BitmapFactory.decodeFile(aluno.getFoto());// 
      Bitmap fotoReduz = Bitmap.createScaledBitmap(fotoAluno, 100, 100, true); 

      holder.foto.setImageBitmap(fotoReduz);//  
     } else { 
      Drawable semFoto = context.getResources().getDrawable(R.drawable.ic_no_image3); 
      holder.foto.setImageDrawable(semFoto); 
     }  
    } 

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

    public void setClickListener(ItemClickListener itemClickListener) { 
     clickListener = itemClickListener; 
    }  

    public void setLongItemClickListenerClickListener(LongItemClickListener longItemClickListenerClickListener) { 
     longItemClickListener = longItemClickListenerClickListener; 
    } 


    public class AlunoViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener, View.OnLongClickListener { 
     final TextView nome; 
     final ImageView foto;// 

     public AlunoViewHolder(View view) { 
      super(view); 
      nome = (TextView) view.findViewById(R.id.nome); 
      foto = (ImageView) view.findViewById(R.id.fotinha);// 

      view.setOnClickListener(this); 
      view.setOnLongClickListener(this);//nao tinha 
     } 

     @Override 
     public void onClick(View view) { 
      if (clickListener != null) 
       clickListener.onItemClick(view, getAdapterPosition(), false); 
     } 

     @Override 
     public boolean onLongClick(View view) { 
      if (longItemClickListener != null) 
       longItemClickListener.onItemClick(view, getAdapterPosition()); 
      return false; 
     } 
    } 

    public interface ItemClickListener { 
     void onItemClick(View view, int position, boolean b);  
    } 

    public interface LongItemClickListener { 
     boolean onItemClick(View view, int position); 
    } 
} 

我是Android编程的初学者，我必须执行某些错误。

Answer 1

您可以在Android中使用Glid库来平滑图像加载。

请参考以下链接库

https://github.com/bumptech/glide