java - Get Bitmap image from Url

I want to get Bitmap image from Url:

Bitmap mage = getBitmapFromUrl(urlPhotoInFrameFirst);

public static Bitmap getBitmapFromUrl (String uri){
    URL url = null;
    try {
        url = new URL(uri);
        Bitmap image = BitmapFactory.decodeStream(url.openConnection().getInputStream());
        return image;

    } catch (MalformedURLException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

But app stop in this line:

Bitmap image = BitmapFactory.decodeStream(url.openConnection().getInputStream());

Error:

FATAL EXCEPTION: main
android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)

at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
at java.net.InetAddress.getAllByName(InetAddress.java:214)
at libcore.net.http.HttpConnection.(HttpConnection.java:70)
at libcore.net.http.HttpConnection.(HttpConnection.java:50)
at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341)
at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.makeSslConnection(HttpsURLConnectionImpl.java:461)

at libcore.net.http.HttpsURLConnectionImpl$HttpsEngine.connect(HttpsURLConnectionImpl.java:433)
at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
at libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:271)
at com.example.sivolotskiy.multiexpro.util.BitmapLoader.getBitmapFromUrl(BitmapLoader.java:33)
at com.example.sivolotskiy.multiexpro.ui.EditFragment.setImageInFrames(EditFragment.java:161)
at com.example.sivolotskiy.multiexpro.ui.EditFragment.startAfterView(EditFragment.java:119)
at com.example.sivolotskiy.multiexpro.ui.EditFragment_.onViewChanged(EditFragment_.java:202)

at org.androidannotations.api.view.OnViewChangedNotifier.notifyViewChanged(OnViewChangedNotifier.java:41)
at com.example.sivolotskiy.multiexpro.ui.EditFragment_.onViewCreated(EditFragment_.java:71)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:843)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1035)
at android.app.BackStackRecord.run(BackStackRecord.java:635)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1397)
at android.app.FragmentManagerImpl$1.run(FragmentManager.java:426)
at android.os.Handler.handleCallback(Handler.java:615)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)

at android.app.ActivityThread.main(ActivityThread.java:4745)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)

Answer

As exception says you can't make network calls in the Main(UI) thread. So you need to wrap your code into runnable/thread and call it. Could look like this:

public static class GetBitmapTask implements Runnable {

    private final String uri;
    private final Callback callback;

    public GetBitmapTask(String uri, Callback callback) {
        this.uri = uri;
        this.callback = callback;
    }


    @Override public void run() {
        try {
            URL url = new URL(uri);
            Bitmap bmp = BitmapFactory.decodeStream(url.openConnection().getInputStream());
            callback.onFinish(bmp);
        } catch (IOException e) {
            callback.onError(e);
        }
    }


    public interface Callback{
        void onFinish(Bitmap bitmap);
        void onError(Throwable t);
    }
}

Usage:

new Thread(new GetBitmapTask("", new GetBitmapTask.Callback() {

    @Override public void onFinish(Bitmap bitmap) {
        //here is your bitmap
    }

    @Override public void onError(Throwable t) {
        //here you have to handle error
    }
})).start();

Or even better method: use a library for loading images.