ActionBar下拉式导航

最新推荐文章于 2023-04-20 17:51:58 发布

bug_lover_liao

最新推荐文章于 2023-04-20 17:51:58 发布

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分类专栏： android案例文章标签： android下拉式导航

本文链接：https://blog.csdn.net/csdn_blog_lcl/article/details/52574352

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第一步：编写布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal"
    android:id="@+id/container">
</LinearLayout>

第二步：编写Activity代码：

public class DropdownTabActivity extends Activity implements ActionBar.OnNavigationListener{
    private static final String SELECTED_ITEM = "selected_item";
    ActionBar actionBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.tab);
        actionBar = getActionBar();
        //  设置ActionBar显示标题
        actionBar.setDisplayShowTitleEnabled(true);
        //  设置ActionBar的导航模式
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
        actionBar.setListNavigationCallbacks(
                new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,
                        android.R.id.text1,new String[]{"第一页","第二页","第三页"}),this);

    }
    //  当点击一个Tab选项时触发
    @Override
    public boolean onNavigationItemSelected(int itemPosition, long itemId) {
        Fragment fragment = new DummyFragment();
        Bundle args = new Bundle();
        args.putInt(DummyFragment.ARG_SECTION_NUMBER,itemPosition+1);
        fragment.setArguments(args);
        FragmentTransaction transaction = getFragmentManager().beginTransaction();
        transaction.replace(R.id.container,fragment);
        transaction.commit();
        return false;
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        //   将已选择的ActionBar的索引值存到Bundle数据中KEY为SELECTED_ITEM中去
        outState.putInt(SELECTED_ITEM,getActionBar().getSelectedNavigationIndex());
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        //   设置ActionBar的导航索引值
        getActionBar().setSelectedNavigationItem(savedInstanceState.getInt(SELECTED_ITEM));
    }

}

其中 DummyFragment代码如下：

public class DummyFragment extends Fragment {
    public final static String ARG_SECTION_NUMBER = "section_number";
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        TextView textView = new TextView(getActivity());
        textView.setGravity(Gravity.START);
        Bundle args = getArguments();
        textView.setText(args.getInt(ARG_SECTION_NUMBER)+"");
        textView.setTextSize(28);
        return textView;
    }
}

运行效果如下：