public class Main extends ListActivity {

	private DbAdapter mDbHelper;
	
	private TextView tvvor;
	private TextView tvnach;
	
	private ImageView imgr;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.ringer);
		
		
		ListView lv = getListView();
		lv.setTextFilterEnabled(true);
		
		mDbHelper = new DbAdapter(this);
		mDbHelper.open();
		
	
		tvvor = (TextView) findViewById(R.id.tvvor); //Diese 3 Variablen haben NULL
		tvnach = (TextView) findViewById(R.id.tvnach);
		imgr = (ImageView) findViewById(R.id.image);
		
		
		
		Cursor cur = mDbHelper.fetchAll();
		startManagingCursor(cur);
		
		//Hier wird die LV gefüllt
		
		String[] From = new String[] {DbAdapter.KEY_FIRSTNAME, DbAdapter.KEY_NAME, DbAdapter.KEY_IMAGE };
		int[] To = new int[] {R.id.tvvor, R.id.tvnach, R.id.image};
		
		ListAdapter scur = new SimpleCursorAdapter(this, R.layout.list_item, cur, From, To);;
		((SimpleCursorAdapter) scur).setViewBinder(new SimpleCursorAdapter.ViewBinder() {
			
			@Override
			public boolean setViewValue(View view, Cursor cur, int columnIndex) {
				int viewid = view.getId();

				switch(viewid){
				case R.id.tvvor:
					
					tvvor.setText(cur.getString(cur.getColumnIndex(bAdapter.KEY_FIRSTNAME)));	//Hier kommt dann eine Exception weil tvvor null ist.
					break;
				case R.id.tvnach:
					
					tvnach.setText(cur.getString(cur.getColumnIndex(DbAdapter.KEY_NAME)));
					break;
				case R.id.image:
					
					String img = cur.getString(cur.getColumnIndex(DbAdapter.KEY_IMAGE));
					Uri u = Uri.parse(img);
					imgr.setImageURI(u);
					break;
				}
				
				return true;
			}
		});
		
		lv.setAdapter(scur);
	}	
}

   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="horizontal" >

        <ImageView
            android:id="@+id/image"
            android:layout_width="76dp"
            android:layout_height="72dp"
            android:src="@drawable/unbenannt" />

        	<TextView
        	    android:id="@+id/tvvor"
        	    android:layout_width="wrap_content"
        	    android:layout_height="wrap_content"
        	    android:layout_gravity="center"
        	    android:padding="10dp"
        	    android:text="Angela"
        	    android:textSize="16sp" android:textStyle="bold" android:textColor="@color/blue">

			</TextView>

        	<TextView
        	    android:id="@+id/tvnach"
        	    android:layout_width="161dp"
        	    android:layout_height="wrap_content"
        	    android:layout_gravity="center"
        	    android:padding="10dp"
        	    android:text="Merkel"
        	    android:textSize="16sp" 
        	    android:textStyle="bold" 
        	    android:layout_marginLeft="-15dp" 
        	    android:textColor="@color/blue"/>
        
    </LinearLayout>

tvvor = (TextView) findViewById(R.id.tvvor); //Diese 3 Variablen haben NULL
		tvnach = (TextView) findViewById(R.id.tvnach);
		imgr = (ImageView) findViewById(R.id.image);