从活动类打开 Android Navigation Drawer [英] Open Android Navigation Drawer from an activity class
问题描述
我正在开发 android Navigation Drawer 并且通过他们的文档看起来，抽屉只能扩展 Fragment Activity，以便从我的所有活动中打开抽屉，我需要制作我所有的活动一个片段，这不是一个可行的解决方案.
I am working on android Navigation Drawer and through their documentation it looks like, the drawer can only extend Fragment Activity, so that to open drawer from all my activities, I need to make all my activities a fragment, which is not a feasible solution.
有没有办法打开一个从 Activity 扩展 FragmentActivity 的抽屉?
Is there a way I can open a drawer that extends FragmentActivity from an Activity?
当我尝试从 Activity 类扩展我的抽屉活动，以及另一个将打开抽屉的活动扩展抽屉活动类(此处为 SlideMenuActivity)时，应用程序崩溃并给出 NullPointerException.
When I try to extend my drawer activity from Activity class, and another activity that will open the drawer extending the draweractivity class (here SlideMenuActivity), the app crashes giving NullPointerException.
下面是打开抽屉布局的代码，但是一旦第一个活动启动，我就无法访问抽屉.
Below is the code for opening a drawer layout but once the first activity launches, I am unable to access the drawer.
应用在 onPostCreate 方法中的同步状态点崩溃
App is crashing on syncState point in onPostCreate method
@Override
protected void onPostCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onPostCreate(savedInstanceState);
getActionDrawerToggle().syncState();
}
public class SlideMenuActivity extends FragmentActivity implements OnItemClickListener
{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setDrawerLayout();
setDrawerList();
if (savedInstanceState == null)
{
getDrawerListView().setSelectionAfterHeaderView();
getDrawerListView().setSelection(1);
selectItem(1);
}
}
//
// @Override
// public void setContentView(int layoutResID) {
// // TODO Auto-generated method stub
// super.setContentView(layoutResID);
// }
private DrawerLayout getDrawerView()
{
return (DrawerLayout)findViewById(R.id.drawer_layout);
}
private ListView getDrawerListView()
{
return (ListView) findViewById(R.id.left_drawer);
}
private ActionBarDrawerToggle getActionDrawerToggle()
{
ActionBarDrawerToggle drawerToggle=new ActionBarDrawerToggle(
this, /* host Activity */
getDrawerView(), /* DrawerLayout object */
R.drawable.ic_drawer, /* nav drawer image to replace 'Up' caret */
R.string.drawer_open, /* "open drawer" description for accessibility */
R.string.drawer_close /* "close drawer" description for accessibility */
) {
@Override
public void onDrawerClosed(View view) {
super.onDrawerClosed(view);
}
@Override
public void onDrawerOpened(View view) {
super.onDrawerOpened(view);
}
};
return drawerToggle;
}
private void setDrawerLayout(){
// set a custom shadow that overlays the main content when the drawer opens
getDrawerView().setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.RELATIVE_HORIZONTAL_GRAVITY_MASK);
// enable ActionBar app icon to behave as action to toggle navigation drawer
getDrawerView().setDrawerListener(getActionDrawerToggle());
}
/**
* Set up the drawer's list view with items and click listener
*/
private void setDrawerList()
{
ImageView imageView=new ImageView(this);
imageView.setImageDrawable(getResources().getDrawable(R.drawable.precision_logo));
CustomBaseAdapter adapter=new CustomBaseAdapter();
adapter.list=getListViewData();
adapter.context=this;
ListView drawerList=getDrawerListView();
drawerList.setHeaderDividersEnabled(true);
drawerList.addHeaderView(imageView, null, false);
drawerList.setScrollingCacheEnabled(false);
drawerList.setAdapter(adapter);
drawerList.setOnItemClickListener(this);
}
private void selectItem(int position){
// update the main content by replacing fragments
// Fragment fragment=null;
// FragmentManager manager=getSupportFragmentManager();
switch (position) {
case 1:
this.startActivity(new Intent(this,SavedTankListActivity.class));
// fragment = new SavedMixesFragment();
// fragment = new SavedTankListActivity();
// manager.beginTransaction().replace(R.id.content_frame, fragment).commit();
break;
case 2:
// fragment=new MixGuideFragment();
// manager.beginTransaction().replace(R.id.content_frame, fragment).commit();
break;
default:
// fragment = new SavedMixesFragment();
// manager.beginTransaction().replace(R.id.content_frame, fragment).commit();
break;
}
getDrawerView().closeDrawer(getDrawerListView());
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onPostCreate(savedInstanceState);
getActionDrawerToggle().syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
getActionDrawerToggle().onConfigurationChanged(newConfig);
}
private ArrayList<DrawerListModel> getListViewData()
{
ArrayList<DrawerListModel> listViewData=new ArrayList<DrawerListModel>();
String[] listItemArray=getResources().getStringArray(R.array.slide_bar_list_item_array);
for(int index=0;index<listItemArray.length;index++)
{
DrawerListModel model=new DrawerListModel();
model.listItem=listItemArray[index];
listViewData.add(model);
}
return listViewData;
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position,long id)
{
view.setSelected(true);
selectItem(position);
}
public void openDrawerList(View view){
getDrawerView().openDrawer(getDrawerListView());
}
}
推荐答案
我也在浏览文档并认为我必须将所有活动转换为片段.只是为了澄清一下，事实并非如此.您可以在线性布局下或根据需要拥有任意数量的元素.
I too was looking through the documentation and thought that I had to switch all my activities into fragments. Just to clear it up, this is simply not the case. You can have as many elements under the linear layout or whatever as needed.
例如，如果没有 appdrawer 的基本活动是:
For example if your base activity without the appdrawer is:
<RelativeLayout>
<TextView>
</TextView>
<Button>
<Button>
</RelativeLayout>
简单做
<android.support.v4.widget.DrawerLayout>
<RelativeLayout>
<TextView>
</TextView>
<Button>
<Button>
</RelativeLayout>
<ListView>
</ListView>
</android.support.v4.widget.DrawerLayout>
这篇关于从活动类打开 Android Navigation Drawer的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
