After trying view Bitmap image in Android studio 3.2 app crashes

Question

I'm trying to develop an android app android studio 3.2. When app crashes imageView.setImageBitmap(bitmap); stopped the app. This is my code to get an image in drawable

       public class MainActivity extends AppCompatActivity {
        Button button;
        ImageView imageView;
        TextView textView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        this.imageView=(ImageView)findViewById(R.id.image_view);
        textView=(TextView)findViewById(R.id.text_view);
        button=(Button)findViewById(R.id.button_click);

        try {
            this.imageView.setImageResource(R.drawable.helloworld);

        }catch (Exception e){
            Log.d("error_msg", ""+e);
            System.out.println(">>>>>>>>>>>>>>>>>"+e);

        }
//
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
}

and also i used this

implementation 'com.google.android.gms:play-services-vision:16.2.0'

How to solve this issue?

D/error_msg: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference

This is the error i got when Catch the error

Look at [the stack trace](https://stackoverflow.com/questions/23353173) to determine the cause of the crash. — Mike M., Dec 20 '18 at 04:38

score 1 · Answer 1 · answered Dec 20 '18 at 06:04

1

You can set image resource to ImageView by using setImageResource

imageView.setImageResource(R.drawable.helloworld);

If you specifically want to add bitmap then try to debug and check the error which leads to crash.

answered Dec 20 '18 at 06:04

Uma Achanta

3,669
4
22
49

D/error_msg: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setImageResource(int)' on a null object reference this is the error i got – RUC... Dec 20 '18 at 09:25
so your imageView is null – Uma Achanta Dec 20 '18 at 09:25
did you added ImageView imageView = (ImageView)findViewById(R.id.imageviewid) this? – Uma Achanta Dec 20 '18 at 09:28
ImageView imageView=(ImageView)findViewById(R.id.image_view); yes i added this line – RUC... Dec 20 '18 at 09:29
add your full class in question. so that we can understand – Uma Achanta Dec 20 '18 at 09:30
I added full class can you check – RUC... Dec 20 '18 at 09:36
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/185540/discussion-between-uma-achanta-and-ruc). – Uma Achanta Dec 20 '18 at 09:37
check once you have helloworld image in drawable folder of mipmap folder. – Uma Achanta Dec 20 '18 at 09:39
1

I found the error is super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); this code add top of the code then it work thank you – RUC... Dec 20 '18 at 09:40
you forget to add setContentView(R.layout.your_xml_name); – Uma Achanta Dec 20 '18 at 09:40
what happened? setContentView(R.layout.your_xml_name); Isn't it the cause? – Uma Achanta Dec 24 '18 at 04:02

score 1 · Accepted Answer · answered Dec 20 '18 at 09:44

Move the calls super.onCreate() and setContentView() to the top of OnCreate() method. Like this:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    this.imageView=(ImageView)findViewById(R.id.image_view);
    textView=(TextView)findViewById(R.id.text_view);
    button=(Button)findViewById(R.id.button_click);

    try {
        this.imageView.setImageResource(R.drawable.helloworld);

    } catch (Exception e){
        Log.d("error_msg", ""+e);
        System.out.println(">>>>>>>>>>>>>>>>>"+e);
    }
}

The layout has to be set before calling findViewById().

After trying view Bitmap image in Android studio 3.2 app crashes

2 Answers2