分配列表视图ID错误-Android Studio

Question

I'm new to Android development. I'm using Android studio. I created a listview in xml and when I'm trying to call it in MainActivity(Java file). It gives an error near R.layout.listView .

My code as follows.

public class MainActivity extends ActionBarActivity {
ListView l;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        l=(ListView)findViewById(R.layout.listView);

    }


}

Answer 1

Change

l=(ListView)findViewById(R.layout.listView);

To

l=(ListView)findViewById(R.id.listView);

Your code will be like this:

   public class MainActivity extends ActionBarActivity {
    ListView l;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            l=(ListView)findViewById(R.id.listView); 
        }
    }

Answer 2

Wrong Tag

l=(ListView)findViewById(R.layout.listView);

Please set id instead of layout

Finally

     public class MainActivity extends ActionBarActivity {
    ListView l;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        l=(ListView)findViewById(R.id.listView);

    }


}

Answer 3

please check the same id that you have added to your xml file, I mean to say that in your xml file has the same id name listView that you have added to your java class.

public class MainActivity extends ActionBarActivity {

    private ListView l;

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

            l = (ListView)findViewById(R.id.listView);

        }
    }