Si je suppose que vous êtes en utilisant android.support.v4.widget.DrawerLayout
dans votre mise en page, puis cette approche peut fonctionner pour vous; je ne l'ai testé sur API 21
, mais étant donné qu'il est le plus souvent en utilisant les bibliothèques de prise en charge, il doit travailler (les fameux derniers mots) sur la partie inférieure ou supérieure de cibles.
import android.support.v7.app.ActionBarDrawerToggle
import android.support.v4.widget.DrawerLayout
ActionBarDrawerToggle mDrawerToggle;
DrawerLayout drawerLayout;
private boolean mToolBarNavigationListenerIsRegistered = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
// Get DrawerLayout ref from layout
drawerLayout = (DrawerLayout)findViewById(R.id.drawer);
// Initialize ActionBarDrawerToggle, which will control toggle of hamburger.
// You set the values of R.string.open and R.string.close accordingly.
// Also, you can implement drawer toggle listener if you want.
mDrawerToggle = new ActionBarDrawerToggle (this, drawerLayout, mToolbar, R.string.open, R.string.close);
// Setting the actionbarToggle to drawer layout
drawerLayout.setDrawerListener(mDrawerToggle);
// Calling sync state is necessary to show your hamburger icon...
// or so I hear. Doesn't hurt including it even if you find it works
// without it on your test device(s)
mDrawerToggle.syncState();
}
/**
* To be semantically or contextually correct, maybe change the name
* and signature of this function to something like:
*
* private void showBackButton(boolean show)
* Just a suggestion.
*/
private void enableViews(boolean enable) {
// To keep states of ActionBar and ActionBarDrawerToggle synchronized,
// when you enable on one, you disable on the other.
// And as you may notice, the order for this operation is disable first, then enable - VERY VERY IMPORTANT.
if(enable) {
//You may not want to open the drawer on swipe from the left in this case
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED);
// Remove hamburger
mDrawerToggle.setDrawerIndicatorEnabled(false);
// Show back button
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// when DrawerToggle is disabled i.e. setDrawerIndicatorEnabled(false), navigation icon
// clicks are disabled i.e. the UP button will not work.
// We need to add a listener, as in below, so DrawerToggle will forward
// click events to this listener.
if(!mToolBarNavigationListenerIsRegistered) {
mDrawerToggle.setToolbarNavigationClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// Doesn't have to be onBackPressed
onBackPressed();
}
});
mToolBarNavigationListenerIsRegistered = true;
}
} else {
//You must regain the power of swipe for the drawer.
drawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED);
// Remove back button
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
// Show hamburger
mDrawerToggle.setDrawerIndicatorEnabled(true);
// Remove the/any drawer toggle listener
mDrawerToggle.setToolbarNavigationClickListener(null);
mToolBarNavigationListenerIsRegistered = false;
}
// So, one may think "Hmm why not simplify to:
// .....
// getSupportActionBar().setDisplayHomeAsUpEnabled(enable);
// mDrawer.setDrawerIndicatorEnabled(!enable);
// ......
// To re-iterate, the order in which you enable and disable views IS important #dontSimplify.
}
La solution utilise ActionBarDrawerToggle.setDrawerIndicatorEnabled
pour activer / désactiver la visibilité de l'hamburger icône et ActionBar.setDisplayHomeAsUpEnabled
pour la visibilité de la Place du bouton, essentiellement à l'utilisation de leurs respectifs drawable
des ressources.
D'autres hypothèses
- Votre Activité du thème s'étend
Theme.AppCompat.Light.NoActionBar
.