Develop Reference

Display Images in Recyclerview without using any library [duplicate]

I'm trying to download an image using a URL and a button in my app. When I'm running it on my phone, I,m not able to download the image. Can anyone please point out the problem with this. Thanks for the help in advance :)
This is my code.
public class MainActivity extends AppCompatActivity {
ImageView download;
public void downloadImage(View view){
DownloadImage image = new DownloadImage();
Bitmap result;
try {
result = image.execute("https://en.wikipedia.org/wiki/File:Bart_Simpson_200px.png").get();
download.setImageBitmap(result);
}
catch(Exception e)
{
e.printStackTrace();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
download = (ImageView) findViewById(R.id.imageView);
}
public class DownloadImage extends AsyncTask<String, Void, Bitmap>{
#Override
protected Bitmap doInBackground(String... urls) {
URL url;
HttpURLConnection urlConnection = null;
try {
url = new URL(urls[0]);
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setDoInput(true);
urlConnection.connect();
InputStream in = urlConnection.getInputStream();
Bitmap Image = BitmapFactory.decodeStream(in);
in.close();
return Image;
}
catch (MalformedURLException e) {
e.printStackTrace();
}
catch (IOException e) {
e.printStackTrace();
}
return null;
}
}
}

you can download image from url in two ways
1.you can user Glide library to load image from url look the below code it can help you in simple way
compile this library
implementation 'com.github.bumptech.glide:glide:4.6.1'
than load image like this
Glide.with(MainActivity.this)
.load(url)
.apply(new RequestOptions().placeholder(R.drawable.booked_circle).error(R.drawable.booked_circle))
.into(imageview);
2 .try this if you dont want to use third party library
new DownloadImage(imamgeview).execute(url);
create a Async Task
public class DownloadImage extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImage(ImageView bmImage) {
this.bmImage = (ImageView ) bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.d("Error", e.getStackTrace().toString());
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
i hope that it will work in your case

You did not call the function
downloadImage(view);
In the oncreate (after the findviewbyid line)
Also check if the internet permision is in the Android Manifest file :
<uses-permission android:name="android.permission.INTERNET" />
Having said that you should use a library like Glide\Picasso\Ion etc... much better than asynctask for this purpuse
https://github.com/bumptech/glide - Glide
https://github.com/koush/ion - Ion
http://square.github.io/picasso/ - picasso
Hope it helped.

Load Image in RecycleView with Picasso

Hi guys i have an problem,
I have a list and I have to view it in a list using the reycleview but when I go to the image via cericare phat and to do this use picasso
#Override
public void onBindViewHolder(ViewHolder viewHolder, final int i) {
this.viewHolder=viewHolder;
if(scheduler.size()>=1){
viewHolder.time.setText(scheduler.get(i).getTime());
viewHolder.data.setText(scheduler.get(i).getData());
viewHolder.delete.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
removeItem(i);
}
});
String phat=scheduler.get(i).getImageString();
//result paht: content://com.android.providers.media.documents/document/image%3A445
Picasso.with(c).load(phat).into(viewHolder.img);//does not display the image
viewHolder.img.setOnClickListener(new MyClikListener(i));
viewHolder.time.setOnClickListener(new MyClikListener(i));
viewHolder.data.setOnClickListener(new MyClikListener(i));
viewHolder.card_view_reminder.setOnClickListener(new MyClikListener(i));
}
}
I also tried converting the pat in a URI but nothing.
Making debugging tells me onBitmapFailed

Use the below code:
Picasso.with(c).load(new File(phat)).into(viewHolder.imageView);
Hope this helps.

Try this
new DownloadImage(yourImageView).execute(URL);
create AsyncTask for download image from background process
public class DownloadImage extends AsyncTask<String, Void, Bitmap> {
CircleImageView bmImage;
public DownloadImage(ImageView bmImage) {
this.bmImage = (CircleImageView) bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.d("Error", e.getStackTrace().toString());
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
It will work for all..

load .png from url's in the existing imageview

i seen this, and made how they say.
my app loads and shows .jpg, but don't show .png. He shows empty screen. (tested on versions 4.1 and 4.2)
if (isOnline()) {
new DownloadImageTask((ImageView) findViewById(R.id.imageViewSA))
.execute(img);
} else {
tv_info.setText("Включите интернет для загрузки");
}
}
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}

you can use universal image loader library instead, so easy to integrate in your code, you can display images from URL to imageView like this
imageLoader.displayImage(url, imageView);
here's a good example of using UIL
and the library
good luck ;)

Changing the pictures after seconds in android

Here is my main activity-after OnCreate code is :
private class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
and I have one ImageView so I can show the url-picture in this ImageView with below code:
ImageView imageView = (ImageView) findViewById(R.id.imageView1);
new DownloadImageTask(imageView).execute("http://url.com/background1.jpg");
what i need exactly, i need to add three image in this ImageView and in every 3 seconds, picture automatically changed to another link.
Picture 2 and after three second, Picture 3
How we can do this?
Thanks

Use this to change image after 3 sec
call this in your OnCreate()
handler=new Handler();
handler.postDelayed(myRunnable, 3000);
define it outside the OnCreate()
private Runnable myRunnable=new Runnable() {
#Override
public void run() {
// change your url to imgeview here some thing like
new DownloadImageTask(imageView).execute("http://url.com/picutre2.jpg");
handler.postDelayed(this, 3000);
}
}
Note : my suggestions is to cache the downloaded image so to avoid network usage

Setting image from url

I have an image view in my Android app, where I have to set a simple image from url. I tried the below code, but it doesn't set the image from url.
try {
URL url = new URL("https://drive.google.com/...");
HttpURLConnection connection = (HttpURLConnection)url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream stream = connection.getInputStream();
Bitmap teamBmpImage = BitmapFactory.decodeStream(stream);
teamImgView.setImageBitmap(teamBmpImage);
}
catch (Exception e) {
}
Could someone guide me to achieve this please?
UPDATED CODE: Which gives Nullpointer exception
public class AboutActivity extends ActionBarActivity {
ImageView teamImgView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_about);
teamImgView = (ImageView) this.findViewById(R.id.teamImageView);
new DownloadImageTask(teamImgView).execute("http://docs.oracle.com/javase/tutorial/2d/images/examples/strawberry.jpg");
}
class DownloadImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public DownloadImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
#Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
//pd.show();
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
//pd.dismiss();
bmImage.setImageBitmap(result);
}
}
}

I guess you are executing your code on the MainThread, which leads to a NetworkOnMainThreadException in android. Try to execute your code asynchronous like in the example below
new AsyncTask<String, Integer, Bitmap>() {
#Override
protected Bitmap doInBackground(String... params) {
try {
URL url = new URL(params[0]);
return BitmapFactory.decodeStream(url.openConnection().getInputStream());
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Bitmap bm) {
ImageView teamImgView = (ImageView) findViewById(R.id.teamImageView);
teamImgView.setImageBitmap(bm);
}
}.execute("https://drive.google.com/uc?....");

You can use Picasso library and here is a detailed tutorial on how to do this.
This is very simple example usage
Picasso.with(activityContext)
.load("https://drive.google.com/uc?....")
.placeholder(R.drawable.image_name)
.into(imageView);

As bojan says you can use Picasso library wich handles many common pitfalls of image loading on Android.
Picasso.with(context).load("http://myurl/myImage.png").into(imageView);
Picasso
Anyway, check out this threat too :)
How to load an ImageView by URL in Android?

Try following this link:
http://www.tutorialsbuzz.com/2014/11/android-volley-url-imageview.html
This will help you to load your image using Volley library which will do all the networking stuff on networking thread and set your image on main UI thread. It has also the LRUCache part which you can skip if you want.