I understand that it is possible a silly question but I can not find the answer to it. I ask your help.
I have a RecyclerView using a LinearLayoutManager, and a custom RecyclerView.Adapter.
My data class:
public class Img extends ArrayList<Img> {
int id = 0;
String filepath = "";
boolean checked = false;
int progress = 0;
... getters and setters...
}
Code in activity:
File folder = new File("My path");
File[] files = folder.listFiles();
int id = 0;
for (File file : files) {
if (!file.isDirectory()) {
Img img = new Img();
img.setId(id);
img.setFilepath(file.toString());
imgs.add(img);
++id;
}
}
mAdapter = new GalleryAdapter(getApplicationContext(), imgs);
RecyclerView.LayoutManager mLayoutManager = new GridLayoutManager(getApplicationContext(), 2);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(mAdapter);
and adapter:
@Override
public void onBindViewHolder(final MyViewHolder holder, final int position) {
Img item = imgs.get(position);
holder.txt.setText(String.valueOf(item.getProgress()));
holder.thumbnail.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
File source = new File(imgs.get(position).getFilepath());
String strFileName = source.getName();
File destination = new File("My path" + "/" + strFileName);
try {
InputStream input = null;
OutputStream output = null;
long lenghtOfFile = source.length();
int count;
try {
input = new FileInputStream(source);
output = new FileOutputStream(destination);
byte[] data = new byte[1024];
long total = 0;
int xc2 = 0;
while ((count = input.read(data)) != -1) {
total += count;
int xc = (int) ((total * 100) / lenghtOfFile);
output.write(data, 0, count);
imgs.get(position).setProgress(xc);
notifyItemChanged(position);
try {
Thread.sleep(20);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
} finally {
output.flush();
output.close();
input.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
});
Why notifyItemChanged (position) is triggered only after the operation is completed and submitted to the TextView (txt) only the value of 100?
UPD: This code does not work
@Override
public MyViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
final View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.gallery_thumbnail, parent, false);
final MyViewHolder holder = new MyViewHolder(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final int position = holder.getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
File source = new File(imgs.get(position).getFilepath());
String strFileName = source.getName();
File destination = new File("My path" + "/" + strFileName);
try {
InputStream input = null;
OutputStream output = null;
long lenghtOfFile = source.length();
int count;
try {
input = new FileInputStream(source);
output = new FileOutputStream(destination);
byte[] data = new byte[1024];
long total = 0;
int xc2 = 0;
while ((count = input.read(data)) != -1) {
total += count;
int xc = (int) ((total * 100) / lenghtOfFile);
output.write(data, 0, count);
if (xc2!=xc){
//holder.progress_bar.setProgress(xc);
imgs.get(position).setProgress(xc);
notifyItemChanged(position);
try {
Thread.sleep(40);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
xc2 = xc;
}
} finally {
output.flush();
output.close();
input.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
return holder;
}
UPD2: This code does not work
@Override
public MyViewHolder onCreateViewHolder(final ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.gallery_thumbnail, parent, false);
final MyViewHolder holder = new MyViewHolder(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final int position = holder.getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
for (int i=1; i<=100; ++i) {
imgs.get(position).setProgress(i);
notifyItemChanged(position);
try {
Thread.sleep(50);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
});
//return new MyViewHolder(itemView);
return holder;
}
Basically your'e doing your'e file loading on the UI thread, so everytime you call to notifyItemChanged() you add a task to the Looper but the Looper gets to that task only when you finish the loading therefor you only see the 100.
I would run the load on a different thread like so:
Thats my guess, good luck!