getExtras NullPointerException

Question

app crash NullPointerException in line int position = i.getExtras().getInt("id"); what could be the problem ? Tell me please !

I build on the tutorial http://seegatesite.com/android-tutorial-display-image-to-android-gridview-from-url-using-picasso

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final GridView gridview = (GridView) findViewById(R.id.gridview);
        gridview.setAdapter(new ImageAdapter(this));
        gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
                Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
                i.putExtra("id", position);
                startActivity(i);

FullImageActivity

public class FullImageActivity extends Activity {

ImageView img;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.fullimageview);



        Intent i = getIntent();

    int position = i.getExtras().getInt("id");
    ImageAdapter imageAdapter = new ImageAdapter(this);

    img = (ImageView) findViewById(R.id.image);
    String url = imageAdapter.getItem(position);

    new DownloadImage().execute(url);
}
private class DownloadImage extends AsyncTask<String, Void, Bitmap> {

    @Override
    protected Bitmap doInBackground(String... URL) {
        String imageURL = URL[0];
        Bitmap bitmap = null;
        try {
            InputStream input = new java.net.URL(imageURL).openStream();
            bitmap = BitmapFactory.decodeStream(input);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bitmap;
    }

    @Override
    protected void onPostExecute(Bitmap result) {
        img.setImageBitmap(result);
    }
}

ImageAdapter

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    int imageTotal = 7;
    public static String[] mThumbIds = {
            "http://i.imgur.com/KzQO.jpg",
            "http://i.imgur.com/87KE.jpg",
            "http://i.imgur.com/HeJ.jpg",
            "http://i.imgur.com/3d3.jpg",
            "http://i.imgur.com/WLi.jpg",
            "http://i.imgur.com/Pp.jpg",
            "http://i.imgur.com/Ldt.jpg",
    };

    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return imageTotal;
    }

    @Override
    public String getItem(int position) {
        return mThumbIds[position];
    }

    public long getItemId(int position) {
        return 0;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {
            imageView = new ImageView(mContext);
            imageView.setLayoutParams(new GridView.LayoutParams(220, 220));
            imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
            imageView.setPadding(8, 8, 8, 8);
        } else {
            imageView = (ImageView) convertView;
        }
        String url = getItem(position);
        Picasso.with(mContext)
                .load(url)
                .placeholder(R.drawable.loader)
                .fit()
                .centerCrop().into(imageView);
        return imageView;
    }
}

Errors

java.lang.RuntimeException: Unable to start activity ComponentInfo{123.myapplication/123.myapplication.FullImageActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349)
at android.app.ActivityThread.access$700(ActivityThread.java:159)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:176)
at android.app.ActivityThread.main(ActivityThread.java:5419)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at 123.myapplication.FullImageActivity.onCreate(FullImageActivity.java:30)
at android.app.Activity.performCreate(Activity.java:5372)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2257)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2349) 
at android.app.ActivityThread.access$700(ActivityThread.java:159) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1316) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:176) 
at android.app.ActivityThread.main(ActivityThread.java:5419) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:525) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1046) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:862) 
at dalvik.system.NativeStart.main(Native Method)

debug your code and first check if you are able to getIntent in your activity or not — Vivek Mishra, Feb 08 '17 at 07:55

tahsinRupam · Accepted Answer · 2017-02-08T08:57:25.077

1

Try out the following code:

Replace :

Intent intent = new Intent(getApplicationContext(), FullImageActivity.class);

With this:

Intent intent = new Intent(MainActivity.this, FullImageActivity.class);

And then:

Intent i = getIntent();
Bundle extras = i.getExtras();
int position = extras.getInt("id");

edited Feb 08 '17 at 08:57

answered Feb 08 '17 at 07:53

tahsinRupam

6,325
1
18
34

cannot resolve method getExtras Variable 'extras' is never used – V01ume Feb 08 '17 at 08:19
NPE - int position = extras.getInt("id"); – V01ume Feb 08 '17 at 08:38
I build on the tutorial http://seegatesite.com/android-tutorial-display-image-to-android-gridview-from-url-using-picasso/#comment-4292 – V01ume Feb 08 '17 at 08:40
I've edited again, now? Have you solve your problem? – tahsinRupam Feb 08 '17 at 11:29
thx for help! dear friend – V01ume Feb 08 '17 at 12:56
You are welcome :) – tahsinRupam Feb 09 '17 at 05:33

score 0 · Answer 2 · answered Feb 08 '17 at 07:53

0

use this :

Bundle bundle = getIntent().getExtras();
int position = bundle.getInt("id");

answered Feb 08 '17 at 07:53

Deepak Kumar

1,035
10
18

java.lang.NullPointerException int position = bundle.getInt("id"); – V01ume Feb 08 '17 at 08:22

score 0 · Answer 3 · answered Feb 08 '17 at 07:53

0

Either the method getIntent() returns null, or i.getExtras() returns null. Try to debug it and see which one it is. Then try to figure out why it returns null and fix it or check for null if appropriate.

answered Feb 08 '17 at 07:53

vstrom coder

297
1
8

score 0 · Answer 4 · answered Feb 08 '17 at 07:53

0

You should use it as getIntExtra()

int position = getIntent().getIntExtra("id",1);

don't get confuse about that "1", its in default value

answered Feb 08 '17 at 07:53

Sasi

445
4
19

if I write so being able to show one image in fullimage, no GridView – V01ume Feb 08 '17 at 08:25
Try to use staggeredgridview – Sasi Feb 08 '17 at 08:54
i dont know, I build on the tutorial http://seegatesite.com/android-tutorial-display-image-to-android-gridview-from-url-using-picasso – V01ume Feb 08 '17 at 08:55
[Watch this tutorial](https://www.youtube.com/watch?v=BLgPdmiu5j8) its is better easy for grid view – Sasi Feb 08 '17 at 10:17

getExtras NullPointerException

4 Answers4