我想更改打开抽屉的默认图标。有没有办法可以做到？我搜索了一下，我无法解决它。这是我的导航抽屉类，我在其他需要片段的类中实例化它。
if(et1.getText().toString().length() == 5 && et2.getText().toString().length() == 5){但是，当我将此代码public class navigation_drawer extends Fragment {
public static final String PREF_FILE_NAME = "testpref";
public static final String KEY_USER_LEARNED_DRAWER = "user_learned_drawer";
private ActionBarDrawerToggle drawer_toggle;
private DrawerLayout my_drawer_layout;
private View container_view;
private boolean m_userLearnedDrawer;
private boolean m_fromSavedInstanceState;
public navigation_drawer() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
m_userLearnedDrawer = Boolean.valueOf(
readFromPreferences( getActivity() , KEY_USER_LEARNED_DRAWER , "false" )
);
if( savedInstanceState != null )
{
m_fromSavedInstanceState = true;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
}
public void setUp( int fragmentId , DrawerLayout dl , final Toolbar toolbar )
{
container_view = getActivity().findViewById( fragmentId );
my_drawer_layout = dl;
drawer_toggle = new ActionBarDrawerToggle( getActivity() , dl , toolbar ,
R.string.drawer_open , R.string.drawer_close) {
@Override
public void onDrawerOpened(View drawerView)
{
super.onDrawerOpened(drawerView);
if( ! m_userLearnedDrawer )
{
m_userLearnedDrawer = true;
saveToPreferences( getActivity() , PREF_FILE_NAME ,
m_userLearnedDrawer + "" );
}
getActivity().invalidateOptionsMenu();
}
@Override
public void onDrawerClosed(View drawerView)
{
super.onDrawerClosed(drawerView);
getActivity().invalidateOptionsMenu();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item !=null && item.getItemId() == android.R.id.home)
{
if (my_drawer_layout.isDrawerOpen(Gravity.RIGHT))
{
my_drawer_layout.closeDrawer(Gravity.RIGHT);
}
else
{
my_drawer_layout.openDrawer(Gravity.RIGHT);
}
return true;
}
return false;
}
@Override
public void onDrawerSlide(View drawerView, float slideOffset)
{
if( slideOffset < 0.1 ) {
toolbar.setAlpha(1 - slideOffset);
}
}
};
/*
if( !m_userLearnedDrawer && !m_fromSavedInstanceState )
{
my_drawer_layout.openDrawer( container_view );
}
*/
my_drawer_layout.setDrawerListener( drawer_toggle );
my_drawer_layout.post(
new Runnable() {
@Override
public void run() {
drawer_toggle.syncState();
}
}
);
}
public static void saveToPreferences( Context con , String preferenceName , String preferenceValue)
{
SharedPreferences sp = con.getSharedPreferences( PREF_FILE_NAME , Context.MODE_PRIVATE );
SharedPreferences.Editor editor = sp.edit();
editor.putString( preferenceName , preferenceValue );
editor.apply();
}
public static String readFromPreferences( Context con , String preferenceName , String preferenceValue)
{
SharedPreferences sp = con.getSharedPreferences( PREF_FILE_NAME , Context.MODE_PRIVATE );
return sp.getString( preferenceName , preferenceValue );
}
}
放在onDrawerOpened中时，它会显示默认的汉堡图标，但是当我滑动或单击图标时，它会更改为我的图片并替换默认图标。
这是我实现导航抽屉类的类。
toolbar.setNavigationIcon(R.drawable.picture);
答案 0 :(得分：0)
你需要在切换后调用syncState（）后调用它，所以在Runnable的run（）方法之后将其移到后面。