Android App Error Handling

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

ListAdapter adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,DAYS);

package com.example.recip;

import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;

public class MainActivity extensions ActionBarActivity {

    @ Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ListView listView= (ListView) findViewById (R.id.ListView);

        // Create adapter
        ListAdapter adapter = new ArrayAdapter <String> (this, android.R.layout.simple_list_item_1,DAYS);
        // Adapter Configuration
        listView.setAdapter(adapter);
    }
    // String to display in ListView
    private static final String[]DAYS=new String[]{ "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

    @ Override
    public boolean onCreateOptionsMenu(Menu){
        // Inflate the menu; this add items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main,menu);
        return true;
    }

    @ Override
    public boolean onOptionsItemSelected(MenuItem){
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, solo
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if(id==R.id.action_settings){
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

<RelativeLayoutxmlns:android="http://schemas.android.com/apk/res/android"xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingBottom="@dimen/activity_vertical_margin"
        android:paddingLeft="@dimen/activity_horizontal_margin"
        android:paddingRight="@dimen/activity_horizontal_margin"
        android:paddingTop="@dimen/activity_vertical_margin"
        tools:context="com.example.recip.MainActivity">

     <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Place Buttons"/>

    <Button
        android: id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android: text="gazou"/>

    <ListView
        android:id="@+id/ListView"
        android:layout_width="fill_parent"
        android:layout_height="0 dip"
        android:layout_weight="1"/>
</RelativeLayout>