CODEWITHSUNDEEP
androidandroid-layout
Farid Movsumov
Farid Movsumov

Reputation: 12735

E/AndroidRuntime(543): java.lang.RuntimeException

I just started learning Android and I have following error in my first example please help me.

public class SecondActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final Button buttonNesnesi=(Button) findViewById(id.button1);

        buttonNesnesi.setOnClickListener(
            new OnClickListener() 
            {

            public void onClick(View v) 
            {
                Toast.makeText(SecondActivity.this, "Hello!!!",1000).show();
            }
        }
        );
    }
}

Exception:

E/AndroidRuntime(543): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.developersland/net.developersland.SecondActivity}: java.lang.NullPointerException

And this is my main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />




    <Button
        android:id="@+id/button1"
        android:layout_width="231dp"
        android:layout_height="wrap_content"
        android:text="@string/hello" />

</LinearLayout>

Upvotes: 0

Views: 113

Answers (2)

Arslan Anwar
Arslan Anwar

Reputation: 18746

You are missing R.id.button1

final Button buttonNesnesi=(Button) findViewById(R.id.button1);

Upvotes: 1

user370305
user370305

Reputation: 109257

This should be,

final Button buttonNesnesi=(Button) findViewById(R.id.button1);

not a 

final Button buttonNesnesi=(Button) findViewById(id.button1);

Upvotes: 2

Related Questions