无法打开抽屉式导航
问题描述:
DrawerActivity.java无法打开抽屉式导航
public class DrawerActivity extends MainActivity{
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
private ActionBarDrawerToggle mDrawerToggle;
private CharSequence mDrawerTitle;
private CharSequence mTitle;
private String[] navMenuItems;
@Override
public void onCreate(Bundle savedInstanceState) {
requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);
super.onCreate(savedInstanceState);
setContentView(R.layout.nav_drawer_menu);
mTitle = mDrawerTitle = getTitle();
navMenuItems = getResources().getStringArray(R.array.nav_drawer_items_array);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set a custom shadow that overlays the main content when the drawer opens
mDrawerLayout.setDrawerShadow(R.drawable.drawer_shadow, GravityCompat.START);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<String>(this, R.layout.drawer_list_item, navMenuItems));
//mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
// enable ActionBar app icon to behave as action to toggle nav drawer
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
// ActionBarDrawerToggle ties together the the proper interactions
// between the sliding drawer and the action bar app icon
mDrawerToggle = new ActionBarDrawerToggle(
this, /* host Activity */
mDrawerLayout, /* 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 */
) {
public void onDrawerClosed(View view) {
getSupportActionBar().setTitle(R.string.app_name);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
public void onDrawerOpened(View drawerView) {
getSupportActionBar().setTitle("Menu");
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
}
};
mDrawerLayout.setDrawerListener(mDrawerToggle);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
// ActionBarDrawerToggle will take care of this.
if (mDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* When using the ActionBarDrawerToggle, you must call it during
* onPostCreate() and onConfigurationChanged()...
*/
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
mDrawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggls
mDrawerToggle.onConfigurationChanged(newConfig);
}
}
HomePage.java
public class HomePage extends DrawerActivity {
public static boolean active = false;
private Connection con;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_home);
/*
try {
con = new ConnectDataBase().getCon();
if (con == null)
Toast.makeText(getApplicationContext(), "con is null", Toast.LENGTH_LONG).show();
con.close();
}catch (Exception e){
e.printStackTrace();
}
*/
}
当我在Android清单的主要活动是DrawerActivity,按下应用程序图标,当抽屉出来。但它不会出现在HomePage活动中,并且没有错误。怎么修?!
答
它是因为您在超类中使用了ActionBarDrawerToggle
和mDrawerList
作为private
,因此它们不会被您的子类继承!让他们public
,然后尝试。
编辑
使用这条线在你的子类
super.onCreate(savedInstanceState);
setContentView(R.layout.layout_home);
super.onCreateDrawer(); // this line
看看这个工程
对于DrawerActivity你给出一个布局一样(的菜单)和HomeActivity您给出不同的布局(没有菜单),那么它将如何显示这两个活动的菜单,所以根据它的布局,它会显示菜单 – Hanuman 2015-04-06 12:11:26
我可以知道为什么你的DrawActivity扩展了MainActivity吗?或者你在MainActivity中做了什么代码? – 2015-04-06 12:28:36
@AndroidWeblineindia只是关于行动栏,现在我已经把它们放在一起 – Jerryc 2015-04-06 13:44:43