display an image from an url, the activity stops

Question

little problem, I would like to display an image from an url, without using (glide, picasso etc ...), I want to learn from the errors I make, here is my code, the activity stops , do you see something that I missed?

onCreate :

  String imgUrl = "https://st3.depositphotos.com/1008939/12603/i/950/depositphotos_126032722-stock-photo-roaring-singing-woman.jpg";
    ImageView img = findViewById(R.id.imageArtist);

    try {
        InputStream input = new java.net.URL(imgUrl).openStream();
        Bitmap bitmap = BitmapFactory.decodeStream(input);
        img.setImageBitmap(bitmap);
    } catch (IOException e) {
        e.printStackTrace();
    }

xml :

<ImageView
    android:layout_width="@dimen/dim_170"
    android:layout_height="@dimen/dim_170"
    android:id="@+id/imageArtist"
    android:layout_below="@+id/txtViewTitleArtist"
    android:layout_centerInParent="true"
    android:layout_margin="@dimen/dim_15"
    tools:ignore="ContentDescription" />

thx for your help

NetworkOnMainThreadException. Clearly mentioned in Logcat. And too much tattoos ;-) — blackapps, Aug 28 '21 at 07:40
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.card, PID: 24359 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.card/com.example.card.Activity.ArtistActivity}: android.os.NetworkOnMainThreadException — Nicolas Zanforlini, Aug 28 '21 at 07:42
See [this](https://stackoverflow.com/a/5776903/11718077) it'll clear your doubts — Anshul, Aug 28 '21 at 07:50
Also a rule you should know about Android is to avoid big sized images. Images are showing in memory so, Android can kill your activity process if it is using to much memory. — user3502626, Aug 28 '21 at 08:10
You should use "Picasso" or "Glide" for loading the image from an URL. Check them out! — gcantoni, Aug 28 '21 at 08:57

score 1 · Accepted Answer · answered Aug 28 '21 at 07:53

Here you are trying network operation in Application's main thread (in onCreate) . Before do that you should permit StrictMode ThreadPolicy.

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
            .permitAll().build();
    StrictMode.setThreadPolicy(policy);

    String imgUrl = "https://st3.depositphotos.com/1008939/12603/i/950/depositphotos_126032722-stock-photo-roaring-singing-woman.jpg";
    ImageView img = findViewById(R.id.imageArtist);

    try {
        InputStream input = new java.net.URL(imgUrl).openStream();
        Bitmap bitmap = BitmapFactory.decodeStream(input);
        img.setImageBitmap(bitmap);
    } catch (IOException e) {
        e.printStackTrace();
    }

Plesae check this

`Before do that you should permit StrictMode ThreadPolicy.` No No. Dont learn OP these dirty tricks. OP should use a thread to execute internet code. And you too! — blackapps, Aug 28 '21 at 08:07
He wants to learn from problem he mentioned . And it's for debugging or learning purpose only. — Zahid Islam, Aug 28 '21 at 08:26

display an image from an url, the activity stops

1 Answers1