延迟加载无法正常工作
我在回收站中显示联系人列表。我正在显示联系人配置文件图像,首先我从服务器加载这些图像,然后将这些图像存储在外部存储器中。延迟加载无法正常工作
然后从外部存储装载图像。我可以看到加载的图像,但当我滚动时,我可以看到一些图像一两秒钟,然后消失,我可以看到默认图像图标。
public class ContactAdapter extends RecyclerView.Adapter<ContactAdapter.ContactHolder> {
private List<Contact> contactList;
File myDir1;
private Activity mContext;
private Boolean fileExists;
private File file;
private static final int MY_PERMISSIONS_REQUEST_CALL= 20;
public ContactAdapter(Activity context, List<Contact> contactList) {
this.contactList = contactList;
this.mContext = context;
}
@Override
public ContactHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_layout,null);
ContactHolder mh = new ContactHolder(v);
return mh;
}
@Override
public void onBindViewHolder(final ContactHolder contactHolder, int i) {
final Contact contact = contactList.get(i);
// Log.e("Imagename",""+"http://xesoftwares.co.in/contactsapi/profile_images/85368a5bbd6cffba8a3aa202a80563a2.jpg");//+feedItem.getThumbnail());
Target target = new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
// your code here ...
bitmap = Bitmap.createScaledBitmap(bitmap,(int)(bitmap.getWidth()*0.8), (int)(bitmap.getHeight()*0.8), true);
contactHolder.thumbnail.setImageBitmap(bitmap);
Log.e("ProfileImage", contact.getmProfileImage());
SaveImages(bitmap, contact.getmProfileImage());
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
contactHolder.thumbnail.setImageDrawable(errorDrawable);
// do error handling as required
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
contactHolder.thumbnail.setImageDrawable(placeHolderDrawable);
}
};
contactHolder.thumbnail.setTag(target);
String url = ServiceUrl.getBaseUrl() + ServiceUrl.getImageUserUrl() + contact.getmProfileImage();
Log.e("url",url);
if(contact.getmProfileImage().equals(""))
{
file = new File("");
fileExists = file.exists();
contactHolder.thumbnail.setImageDrawable(ContextCompat.getDrawable(mContext, R.drawable.ic_account_circle_black_48dp));
}
else {
file = new File(Environment.getExternalStorageDirectory() + "/ContactProfileImages/" + contact.getmProfileImage());
fileExists = file.exists();
}
if(fileExists)
{
Log.e("fileExists",file.getAbsolutePath());
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(file.getPath(), bmOptions);
contactHolder.thumbnail.setImageBitmap(bitmap);
}
else {
Log.e("Picasso",file.getAbsolutePath());
Picasso.with(mContext).load(url)
.error(R.drawable.ic_account_circle_black_24dp)
.placeholder(R.drawable.ic_account_circle_black_24dp)
.into(target);
}
contactHolder.title.setText(contact.getmUserName());
//feedListRowHolder.genre.setText(Html.fromHtml(feedItem.getGenre()));
}
@Override
public int getItemCount() {
return (null != contactList ? contactList.size() : 0);
}
public void SaveImages(Bitmap bitmap,String profileName)
{
try {
String root = Environment.getExternalStorageDirectory().getPath();
File myDir = new File(root +"/ContactProfileImages");
if (!myDir.exists()) {
myDir.mkdirs();
}
// String name = new Date().toString();=
String name = profileName;
File myDir1 = new File(myDir, name);
if(!myDir1.exists()) {
FileOutputStream out = new FileOutputStream(myDir1);
bitmap.compress(Bitmap.CompressFormat.PNG,100,out);
out.flush();
out.close();
}
} catch(Exception e){
// some action
}
//myDir1= imageFilePath1.getprofile();
}
public class ContactHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
protected CircleImageView thumbnail;
protected TextView title;
public ContactHolder(View view) {
super(view);
this.thumbnail = (CircleImageView) view.findViewById(R.id.thumbnail);
this.title = (TextView) view.findViewById(R.id.title);
view.setOnClickListener(this);
}
@Override
public void onClick(View v) {
final Contact contact = contactList.get(getAdapterPosition());
final Dialog dialog = new Dialog(mContext);
dialog.setCanceledOnTouchOutside(true);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.custom);
final Window window = dialog.getWindow();
WindowManager.LayoutParams wlp =window.getAttributes();
wlp.gravity = Gravity.CENTER_HORIZONTAL|Gravity.TOP;
wlp.y=320;
window.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
window.setAttributes(wlp);
// set the custom dialog components - text, image and button
TextView txtusername = (TextView) dialog.findViewById(R.id.txtusername);
TextView txtmobile = (TextView) dialog.findViewById(R.id.txtmobile);
TextView txtemail = (TextView) dialog.findViewById(R.id.txtemail);
txtusername.setText(contact.getmUserName());
txtemail.setText(contact.getmEmailId());
txtmobile.setText(contact.getmMobileNo());
SquareImageView image = (SquareImageView) dialog.findViewById(R.id.image);
ImageView image1 = (ImageView) dialog.findViewById(R.id.image1);
ImageView image2 = (ImageView) dialog.findViewById(R.id.image2);
ImageView image3 = (ImageView) dialog.findViewById(R.id.image3);
if(contact.getmProfileImage().equals(""))
{
image.setImageDrawable(ContextCompat.getDrawable(mContext,R.drawable.profile_icon));
}
else {
File file = new File(Environment.getExternalStorageDirectory() + "/ContactProfileImages/" + contact.getmProfileImage());
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
Bitmap bitmap = BitmapFactory.decodeFile(file.getPath(), bmOptions);
image.setImageBitmap(bitmap);
}
image1.setImageResource(R.drawable.ic_call_black_24dp);
image2.setImageResource(R.drawable.ic_textsms_black_24dp);
image3.setImageResource(R.drawable.ic_email_black_24dp);
image2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Uri sms_uri = Uri.parse("smsto:" + contact.getmMobileNo());
Intent sms_intent = new Intent(Intent.ACTION_SENDTO, sms_uri);
mContext.startActivity(sms_intent);
dialog.dismiss();
}
});
image1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel:" + contact.getmMobileNo()));
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
mContext.startActivity(intent);
dialog.dismiss();
}
});
image3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent email = new Intent(Intent.ACTION_SEND);
email.putExtra(Intent.EXTRA_EMAIL, new String[]{contact.getmEmailId()});
email.setType("message/rfc822");
mContext.startActivity(Intent.createChooser(email, "Choose an Email client :"));
}
});
Button dialogButton = (Button) dialog.findViewById(R.id.dialogButtonOK);
// if button is clicked, view all information custom dialog
dialogButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
((MainActivity)mContext).finish();
Intent intent = new Intent(mContext,DetailViewActivity.class);
intent.putExtra("contact",contact);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
mContext.startActivity(intent);
dialog.dismiss();
}
});
dialog.show();
}
}
}
编辑:我搜索了与毕加索库同样的问题,当我们从服务器加载图像,为了这个,我得到了解决,从这样:
recyclerView.setHasFixedSize(true);
recyclerView.setItemViewCacheSize(20);
recyclerView.setDrawingCacheEnabled(true);
recyclerView.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
这时候我加载工作来自服务器的图像,但是当我从外部存储装载图像时仍存在问题。
任何人都可以帮忙吗?谢谢。
然后从外部存储装载图像。我可以看到加载的图像 ,但当我滚动时,我可以看到一些图像一秒或两秒,然后 它们消失,我可以看到默认图像图标。
这是因为您在毕加索使用Target回调。当你滚动列表时,回调被称为迟了一点。只要删除目标,并使用imageview到毕加索,它应该工作得很好。你也不需要像毕加索为你自己缓存位图一样。
public void onBindViewHolder(final ContactHolder contactHolder, int i) {
final Contact contact = contactList.get(i);
// Log.e("Imagename",""+"http://xesoftwares.co.in/contactsapi/profile_images/85368a5bbd6cffba8a3aa202a80563a2.jpg");//+feedItem.getThumbnail());
String url = ServiceUrl.getBaseUrl() + ServiceUrl.getImageUserUrl() + contact.getmProfileImage();
Log.e("url",url);
if(contact.getmProfileImage().equals("")) {
file = new File("");
fileExists = file.exists();
contactHolder.thumbnail.setImageDrawable(ContextCompat.getDrawable(mContext, R.drawable.ic_account_circle_black_48dp));
} else {
file = new File(Environment.getExternalStorageDirectory() + "/ContactProfileImages/" + contact.getmProfileImage());
fileExists = file.exists();
}
Log.e("Picasso",file.getAbsolutePath());
Picasso.with(mContext).load(url)
.error(R.drawable.ic_account_circle_black_24dp)
.placeholder(R.drawable.ic_account_circle_black_24dp)
.into(contactHolder.thumbnail);
contactHolder.title.setText(contact.getmUserName());
//feedListRowHolder.genre.setText(Html.fromHtml(feedItem.getGenre()));
}
我可就错了,但你的问题可能是由您使用Contact
您通过布局位置从数据集中得到的,但因为你在onBitmapLoaded
回调asynchroniously使用引起的,该位置可能已经在那个时刻改变了。因此,所有你需要的是使用适配器位置如下:
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
// your code here ...
Contact c = contactList.get(contactHolder.getAdapterPosition());
bitmap = Bitmap.createScaledBitmap(bitmap,(int)(bitmap.getWidth()*0.8), (int)(bitmap.getHeight()*0.8), true);
contactHolder.thumbnail.setImageBitmap(bitmap);
Log.e("ProfileImage", c.getmProfileImage());
SaveImages(bitmap, c.getmProfileImage());
}
我不知道,这将是有帮助的,但是我们可以尝试,我希望这将是:)
尝试过,但问题仍然没有.. :-(@ rom4ek – Sid
如果您想要简单地加载图像,然后为什么你需要存储在外部storage.if你必须存储为任何其他目的然后存储它,但是当你在ImageView中显示它,然后请使用任何第三方API如Picasso或Universal Image Loader它懒惰加载和它所有类型的缓存内存管理也提供了许多显示的方式。
希望这将帮助你像加载图像
在您的应用程序类中使用此代码来应用整个应用程序中的设置。
final int maxMemory = (int) (Runtime.getRuntime().maxMemory()/1024);
// Use 1/8th of the available memory for this memory cache.
final int cacheSize = maxMemory/8;
Picasso.Builder builder = new Picasso.Builder(getApplicationContext());
builder.memoryCache(new LruCache(cacheSize));
Picasso built = builder.build();
built.setIndicatorsEnabled(true);// it will show indicator where it downloaded from
built.setLoggingEnabled(false);
Picasso.setSingletonInstance(built);
现在的URL传递给毕加索加载它来查看。如果你正在处理大的图像还可以调整图像大小更快的加载。
Picasso
.with(mContext)
.load(url)
.error(R.drawable.on_error)
.placeholder(R.drawable.place_holder)
//.resize(custom_width,custom_height) put custom_height to 0 if you want to maintain aspect ratio
.into(your_view);
检查每一个图像是多么MB。 例如:如果 图像为1mb或500kb,则需要更多时间才能下载 背景中的图像,下载后将存储在catche中。这意味着第一次只需要一段时间下载图像。
第二次来自catche的图像。它将以秒为单位显示所有的 图像。
-
使用排球 - 用于更快和滑翔 - 用于内存管理。
Glide .with(context) .load(rowItem.getPosteduserpostimage()) .asBitmap() .diskCacheStrategy(DiskCacheStrategy.SOURCE) .fitCenter() .placeholder(R.drawable.load_image) .error(R.drawable.cancel_image) .into(holder.ivPostedImageNew);
参考 here 如何装载大尺寸bitmap.You需要缩小图像。
否则,当我上传每个图像时,我使用 库进行裁剪。它会照顾缩小大位图。 例如: 5mb 图像将缩小到180 kb。
入住这CropImage lib 缩减尺寸较大images.Even如果用户不裁剪图像,只 裁剪时选择整个部分,将5 MB缩小到 180kb.Image质量也不错。
我想如果没有作物也可以使用下面的代码,以缩小image.You可以看到这个代码在:
private void startCropImage() {
Intent intent = new Intent(this, CropImage.class);
intent.putExtra(CropImage.IMAGE_PATH, mFileTemp.getPath());
intent.putExtra(CropImage.SCALE, true);
intent.putExtra(CropImage.ASPECT_X, 0); //3 for aspect ratio
intent.putExtra(CropImage.ASPECT_Y, 0); //2 for aspect ratio
startActivityForResult(intent, REQUEST_CODE_CROP_IMAGE);
}
- 而且也不里面使用嵌套的滚动视图recyclerview。
这也许无关,但看看这个[git的链接](https://github.com/codepath/android_guides/wiki/Endless-Scrolling-with-AdapterViews-and-RecyclerView#implementing-with- recyclerview),而不是'.post'使用'.postDelayed' –
在哪里使用.postDelayed? @ Mr.Z – Sid
@Sid:查看http://androidexample.com/Download_Images_From_Web_And_Lazy_Load_In_ListView_-_Android_Example/index.php?view=article_discription&aid=112 – avinash