Question

每个人早上好，

我在片段中使用滑动标签但获取空操作栏。

代码段如下：

public class TestPane extends JPanel {

    private MyTableModel model;
    private int index = 0;
    public TestPane() {
        String data[][] = {
            {"My teacher took my iPod.", "She said they had a rule;", "I couldn't bring it into class", "or even to the school."},
            {"She said she would return it;", "I'd have it back that day.", "But then she tried my headphones on", "and gave a click on Play."},
            {"She looked a little startled,", "but after just a while", "she made sure we were occupied", "and cracked a wicked smile.", ""},
            {"Her body started swaying.", "Her toes began to tap.", "She started grooving in her seat", "and rocking to the rap."},
            {"My teacher said she changed her mind.", "She thinks it's now okay", "to bring my iPod into class.", "She takes it every day."}
        };

        setLayout(new BorderLayout());

        model = new MyTableModel();

        JTable table = new JTable(model);
        table.setRowHeight(75);
        add(new JScrollPane(table));

        JButton add = new JButton("Add");
        add.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (index < data.length) {
                    model.addRow(data[index]);
                }
                index++;
                if (index >= data.length) {
                    add.setEnabled(false);
                }
            }
        });

        add(add, BorderLayout.SOUTH);
    }

    public class MyTableModel extends AbstractTableModel {

        private List<String[]> rowData;

        public MyTableModel() {
            rowData = new ArrayList<>(25);
        }

        public void addRow(String[] data) {
            rowData.add(data);
            fireTableRowsInserted(rowData.size() - 1, rowData.size() - 1);
        }

        @Override
        public int getColumnCount() {
            return 1;
        }

        @Override
        public Class<?> getColumnClass(int columnIndex) {
            return String.class;
        }

        @Override
        public Object getValueAt(int rowIndex, int columnIndex) {
            Object value = null;
            switch (columnIndex) {
                case 0:
                    String[] data = rowData.get(rowIndex);
                    StringJoiner joiner = new StringJoiner("<br>", "<html>", "</html>");
                    for (String text : data) {
                        joiner.add(text);
                    }
                    value = joiner.toString();
                    break;
            }
            return value;
        }

        @Override
        public int getRowCount() {
            return rowData.size();
        }

    }

}

我也尝试过：

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater
                .inflate(R.layout.ride_detail, container, false);
        li = getLayoutInflater(savedInstanceState);
        context = getActivity();
        customizedToast = new CustomizedToast(context, li);
         actionBar = ((ActionBarActivity)getActivity()).getActionBar();

感谢。

Answer 1

如果您正在使用getSupportActionBar，则应使用getActionBar代替ActionBarActivity。 getActionBar方法在ActionBarActivity API中可用，因为它扩展了Activity，但在使用支持活动时不应该使用它。

检查您导入要导入的操作栏...

Answer 2

将Android清单中的Activity主题更改为Theme.Holo

操作栏中的空指针异常

2 个答案: