HeaderListView implementation

HeaderListView

protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		Intent getExtras = getIntent(); 
		jobDetailID = getExtras.getStringExtra("id");
		 
		HeaderListView listView = new HeaderListView(this);
		listView.setAdapter(new SectionAdapter() {
			
			@Override
			public int numberOfSections() {
				// TODO Auto-generated method stub
				return 4;
			}
			
			@Override
			public int numberOfRows(int section) {
				// TODO Auto-generated method stub
				return 35;
			}
			
			@Override
            public View getRowView(int section, int row, View convertView, ViewGroup parent) {
				
                if (convertView == null) {
                    convertView = (TextView) getLayoutInflater().inflate(getResources().getLayout(android.R.layout.simple_list_item_1), null);
                }
                ((TextView) convertView).setText("Section " + section + " Row " + row);
                return convertView;
            }

            @Override
            public int getSectionHeaderViewTypeCount() {
                return 2;
            }

            @Override
            public int getSectionHeaderItemViewType(int section) {
                return section % 2;
            }

            @Override
            public View getSectionHeaderView(int section, View convertView, ViewGroup parent) {
            	
            	Toast.makeText(getApplicationContext(), "sample", Toast.LENGTH_SHORT).show();
            	
            	Log.i("Section", "works");
            	Log.i("JobDetailActivity", "ok!");
                if (convertView == null) {
                	
                	Log.i("convertview", "null");
                	
                    if (getSectionHeaderItemViewType(section) == 0) {
                        convertView = (TextView) getLayoutInflater().inflate(R.layout.list_header, null);
                    } else {
                        convertView = getLayoutInflater().inflate(R.layout.list_header, null);
                    }
                } else {
                	Log.i("convertview is not null", "yes");
                }

                if (getSectionHeaderItemViewType(section) == 0) {
                    ((TextView) convertView).setText("Header for section " + section);
                } else {
                    ((TextView) convertView.findViewById(android.R.id.text1)).setText("Header for section " + section);
                    ((TextView) convertView.findViewById(android.R.id.text2)).setText("Has a detail text field");
                }

                switch (section) {
	                case 0:
	                    convertView.setBackgroundColor(getResources().getColor(R.color.bg_color));
	                    break;
	                case 1:
	                    convertView.setBackgroundColor(getResources().getColor(R.color.header_normal));
	                    break;
	                case 2:
	                    convertView.setBackgroundColor(getResources().getColor(R.color.header_red_color));
	                    break;
	                case 3:
	                    convertView.setBackgroundColor(getResources().getColor(R.color.header_normal));
	                    break;
                }
                return convertView;
            }

			@Override
			public Object getRowItem(int section, int row) {
				// TODO Auto-generated method stub
				return null;
			}
		});
		
		setContentView(listView);
		prepareJobDetail();
	}

You missed / forgot the

            @Override
            public boolean hasSectionHeaderView(int section) {
                return true;
            }

method call in your SectionAdapter.