导航抽屉在活动之间切换

Question

我浏览了该网站一段时间，但找不到问题的答案，我试图让我的导航抽屉在活动而不是片段之间切换。我已经尝试过 switch 语句，但所做的只是让应用程序崩溃，我不知道如何获取抽屉的单独元素以便设置它们，以便如果按下一个，它将转到此页面，如果其他按下它将转到此页面等。

这是我的代码，

package com.example.ColeraineTown;

imports...

public class HomeScreen extends Activity {

private String[] drawerListViewItems;
private DrawerLayout drawerLayout;
private ListView drawerListView;
private ActionBarDrawerToggle actionBarDrawerToggle;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // get list items from strings.xml
    drawerListViewItems = getResources().getStringArray(R.array.items);
    // get ListView defined in activity_main.xml
    drawerListView = (ListView) findViewById(R.id.left_drawer);

    // Set the adapter for the list view
    drawerListView.setAdapter(new ArrayAdapter<String>(this,
            R.layout.drawer_listview_item, drawerListViewItems));

    // 2. App Icon
    drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);

    // 2.1 create ActionBarDrawerToggle
    actionBarDrawerToggle = new ActionBarDrawerToggle(
            this,                  /* host Activity */
            drawerLayout,         /* DrawerLayout object */
            R.drawable.ic_drawer,  /* nav drawer icon to replace 'Up' caret */
            R.string.drawer_open,  /* "open drawer" description */
            R.string.drawer_close  /* "close drawer" description */
    );

    // 2.2 Set actionBarDrawerToggle as the DrawerListener
    drawerLayout.setDrawerListener(actionBarDrawerToggle);

    // 2.3 enable and show "up" arrow
    getActionBar().setDisplayHomeAsUpEnabled(true);

    drawerListView.setOnItemClickListener(new DrawerItemClickListener());
}

@Override
protected void onPostCreate(Bundle savedInstanceState) {
    super.onPostCreate(savedInstanceState);
    // Sync the toggle state after onRestoreInstanceState has occurred.
    actionBarDrawerToggle.syncState();
}

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    actionBarDrawerToggle.onConfigurationChanged(newConfig);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    // call ActionBarDrawerToggle.onOptionsItemSelected(), if it returns true
    // then it has handled the app icon touch event

    if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}

private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView parent, View view, int position, long id) {

        drawerLayout.closeDrawer(drawerListView);

    }
}

}

我整天都在做这个，试图修复它并让它工作，但没有运气。我花了很长时间才让实际的抽屉开始工作，看到它全部消失会很遗憾。

如果你们有能够在活动之间切换的答案，那就太好了！

Answer 1

假设您有 5 个项目（从 0 索引到 4），每个索引标识您项目的一个活动。您可以创建一个方法selectItem(int position)以了解用户选择了哪个抽屉项目。

public void selectItem(int position) {
    Intent intent = null;
    switch(position) {
        case 0:
            intent = new Intent(this, Activity_0.class);
            break;
        case 1:
            intent = new Intent(this, Activity_1.class);
            break;

        ...


        case 4: 
            intent = new Intent(this, Activity_4.class);
            break;

        default : 
            intent = new Intent(this, Activity_0.class); // Activity_0 as default
            break;
    }

    startActivity(intent);
}

最后，将此方法添加到您的DrawerItemClickListener：

private class DrawerItemClickListener implements ListView.OnItemClickListener {
    @Override
    public void onItemClick(AdapterView parent, View view, int position, long id) {
        selectItem(position);
        drawerLayout.closeDrawer(drawerListView);

    }
}

我认为这比使用Fragments 更容易！！！