如何在图片加载之前显示进度条?

huangapple go评论91阅读模式
英文:

how to Progress bar show before image load.?

问题

public class PostAdapter extends RecyclerView.Adapter<PostAdapter.ViewHolder> {

    // ... (other code)

    @Override
    public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
        
        // ... (other code)

        try {
            // Show progress bar before loading image
            holder.progressBar.setVisibility(View.VISIBLE);  // Show progress bar
            Glide.with(mContext.getApplicationContext())
                .load(post.getPostimage())
                .listener(new RequestListener<Drawable>() {
                    @Override
                    public boolean onLoadFailed(@Nullable GlideException e, Object model, Target<Drawable> target, boolean isFirstResource) {
                        // Handle image load failure
                        holder.progressBar.setVisibility(View.GONE);  // Hide progress bar
                        return false;
                    }

                    @Override
                    public boolean onResourceReady(Drawable resource, Object model, Target<Drawable> target, DataSource dataSource, boolean isFirstResource) {
                        // Image loaded successfully
                        holder.progressBar.setVisibility(View.GONE);  // Hide progress bar
                        return false;
                    }
                })
                .into(holder.post_image);

        } catch (Exception e) {
            // Handle any exceptions
        }

        // ... (other code)
    }

    // ... (other code)
}

请注意,我已经在 onBindViewHolder 方法中添加了Glide的监听器,以便在图片加载过程中显示和隐藏进度条。在加载成功或失败时,它会相应地设置进度条的可见性。以上是你提供的代码的翻译部分,如果还有其他问题,请随时提问。

英文:

I want to show a progress bar before image loading. I am getting an image from firebase storage. some time image taking more time to load and show .. ... That's why I am trying to input progressbar before load image..... I have tried but now working. Can anyone help me to solve this issue????

Please check my code below:-

  public class PostAdapter extends RecyclerView.Adapter&lt;PostAdapter.ViewHolder&gt; {
public Context mContext;
private List &lt;Post&gt;mPost;
private FirebaseUser firebaseUser;
ProgressBar progressBar;
public PostAdapter(Context mContext, List&lt;Post&gt; mPost) {
this.mContext = mContext;
this.mPost = mPost;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(mContext).inflate(R.layout.post_item,parent,false);
return new PostAdapter.ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull final ViewHolder holder, final int position) {
firebaseUser= FirebaseAuth.getInstance().getCurrentUser();
final Post post=mPost.get(position);
try {
Glide.with(mContext.getApplicationContext()).load(post.getPostimage()).into(holder.post_image);
}catch (Exception e)
{
}
//holder.time.setText(post.getTime());
Get_Time_ago getTimeAgo=new Get_Time_ago();
long lastTime=Long.parseLong(String.valueOf(post.timestamp));
String last_seen_time=getTimeAgo.getTimeAgo(lastTime,mContext);
holder. time.setText(last_seen_time);
/*SimpleDateFormat sfd = new SimpleDateFormat(&quot;dd-MM-yyyy HH:mm:ss&quot;);
String time=sfd.format(new Date(lastseenonline));
mLast_seenview.setText(time);*/
if(post.getDescription().equals(&quot;&quot;)){
holder.description.setVisibility(View.GONE);
}else {
holder.description.setVisibility(View.VISIBLE);
holder.description.setText(post.getDescription());
}
publisherInfo(holder.image_profile,holder.username,holder.blood,holder.publisher,post.getPublisher());
if(post.getPublisher().equals(firebaseUser.getUid())){
holder.delete.setVisibility(View.VISIBLE);
}else {
holder.delete.setVisibility(View.GONE);
}
holder.delete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
alertDialog.setTitle(&quot;Confirm Delete?&quot;);
alertDialog.setMessage(&quot;Do you want to delete your post?&quot;);
alertDialog.setPositiveButton(&quot;YES&quot;, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
FirebaseDatabase.getInstance().getReference(&quot;posts&quot;).child(post.getPostid()).removeValue();
notify();
}
});
alertDialog.setNegativeButton(&quot;NO&quot;, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
});
}
@Override
public int getItemCount() {
return mPost.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public ImageView image_profile,post_image,like,dislike,comment,save,delete;
public TextView username,blood,likes,dislikes,comments, description,publisher,time;
public ViewHolder(@NonNull View itemView) {
super(itemView);
image_profile=itemView.findViewById(R.id.image_profile);
post_image=itemView.findViewById(R.id.post_image);
like=itemView.findViewById(R.id.like);
comment=itemView.findViewById(R.id.comment);
save=itemView.findViewById(R.id.save);
delete=itemView.findViewById(R.id.delete);
username=itemView.findViewById(R.id.username);
blood=itemView.findViewById(R.id.blood);
time=itemView.findViewById(R.id.time);
likes=itemView.findViewById(R.id.likes);
dislikes=itemView.findViewById(R.id.dislikes);
dislike=itemView.findViewById(R.id.dislike);
comments=itemView.findViewById(R.id.comments);
description=itemView.findViewById(R.id.description);
publisher=itemView.findViewById(R.id.publisher);
progressBar = (ProgressBar) itemView.findViewById(R.id.progressBar);
}
}
private void publisherInfo (final ImageView image_profile, final TextView username,final  TextView blood, final TextView publisher, final String userId ){
DatabaseReference reference= FirebaseDatabase.getInstance().getReference(&quot;Users&quot;).child(userId);
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
try {
User user=dataSnapshot.getValue(User.class);
Glide.with(mContext.getApplicationContext()).load(user.getImageurl()).into(image_profile);
username.setText(user.getUsername());
blood.setText(user.getBlood());
publisher.setText(user.getUsername());
}catch (Exception e){
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}

答案1

得分: 1

你可以在Glide的占位符中使用CircularProgressDrawable来显示加载状态。我从我的小项目中复制了一段代码,它使用Kotlin编写,但很简单:

Kotlin代码:

fun AppCompatImageView.loadImage(imageUri: String) {
    val circularProgressDrawable = CircularProgressDrawable(context)
    circularProgressDrawable.strokeWidth = 5f
    circularProgressDrawable.centerRadius = 30f
    circularProgressDrawable.start()

    Glide.with(context)
            .load(imageUri)
            .placeholder(circularProgressDrawable)
            .error(R.drawable.ic_close_black)
            .override(200, 300)
            .into(this)
}

根据您的评论更新后的Java代码:

void loadImage(AppCompatImageView yourImageView, String imageUri) {
    CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(yourImageView.getContext());
    circularProgressDrawable.setStrokeWidth(5f);
    circularProgressDrawable.setCenterRadius(30f);
    circularProgressDrawable.start();

    Glide.with(yourImageView)
        .load(imageUri)
        .placeholder(circularProgressDrawable)
        .error(R.drawable.ic_close_black)
        .override(200, 300)
        .into(yourImageView);
}
英文:

You can show a loading using a CircularProgressDrawable in the Glides´s placeholder. I copied it from my little project, it is in Kotlin, but is easy:

fun AppCompatImageView.loadImage(imageUri: String) {
val circularProgressDrawable = CircularProgressDrawable(context)
circularProgressDrawable.strokeWidth = 5f
circularProgressDrawable.centerRadius = 30f
circularProgressDrawable.start()
Glide.with(context)
.load(imageUri)
.placeholder(circularProgressDrawable)
.error(R.drawable.ic_close_black)
.override(200, 300)
.into(this)
}

Update after your comment... code in Java:

 void loadImage(AppCompatImageView yourImageView, String imageUri) {
CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(yourImageView.getContext())
circularProgressDrawable.setStrokeWidth(5f);
circularProgressDrawable.setCenterRadius(30f);
circularProgressDrawable.start();
Glide.with(yourImageView)
.load(imageUri)
.placeholder(circularProgressDrawable)
.error(R.drawable.ic_close_black)
.override(200, 300)
.into(yourImageView);
}

答案2

得分: 0

像这样在Java中:

private void loadImage(ImageView yourImageView, String imageUri) {
    CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(yourImageView.getContext());
    circularProgressDrawable.setStrokeWidth(5f);
    circularProgressDrawable.setCenterRadius(30f);
    circularProgressDrawable.start();

    Glide.with(yourImageView.getContext())
        .load(imageUri)
        .placeholder(circularProgressDrawable)
        .error(R.drawable.ic_close_black)
        .override(200, 300)
        .into(yourImageView);
}
英文:

Like this in Java:

private void loadImage(ImageView yourImageView, String imageUri) {
CircularProgressDrawable circularProgressDrawable = new CircularProgressDrawable(yourImageView.getContext())
circularProgressDrawable.setStrokeWidth(5f)
circularProgressDrawable.setCenterRadius(30f)
circularProgressDrawable.start()
Glide.with(yourImageView.getContext())
.load(imageUri)
.placeholder(circularProgressDrawable)
.error(R.drawable.ic_close_black)
.override(200, 300)
.into(yourImageView);
}

huangapple
  • 本文由 发表于 2020年5月29日 16:13:07
  • 转载请务必保留本文链接:https://go.coder-hub.com/62081501.html
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