我在我的应用程序中实现了一个抽屉式导航栏,大部分情况下它似乎工作正常。
我将主页按钮设置为抽屉导航图标(汉堡包),这在正常旋转过程中持续存在。如图 1(人像)和图 2(旋转后的风景)所示。
但是,如果我打开抽屉导航,然后旋转屏幕,然后关闭抽屉导航,主页按钮会变为向上按钮,如图 3 所示。
我曾尝试改变周围的事物,使其始终保持汉堡包图标,但没有成功。
我的 MainActivity 代码如下。
public class MainActivity extends AppCompatActivity {
private String[] mNavigationDrawerItemTitles;
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
Toolbar toolbar;
private String mDrawerTitle;
private String mTitle;
ActionBarDrawerToggle mDrawerToggle;
private static int sNavPosition = 0;
private static final String NAV_POSITION_KEY = "navKey";
private static final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDrawerTitle = getTitle().toString();
mTitle = getTitle().toString();
mNavigationDrawerItemTitles = getResources().getStringArray(R.array.drawer_fragment_items);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
setUpToolbar();
NavDrawerItem[] navDrawerItems = new NavDrawerItem[4];
navDrawerItems[0] = new NavDrawerItem(getString(R.string.nav_home));
navDrawerItems[1] = new NavDrawerItem(getString(R.string.nav_aims));
navDrawerItems[2] = new NavDrawerItem(getString(R.string.nav_arttrail));
navDrawerItems[3] = new NavDrawerItem(getString(R.string.nav_submission));
DrawerItemCustomAdapter adapter = new DrawerItemCustomAdapter(this, R.layout.drawer_list_item,navDrawerItems);
View header = getLayoutInflater().inflate(R.layout.drawer_header,null);
mDrawerList.addHeaderView(header);
mDrawerList.setAdapter(adapter);
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerLayout.addDrawerListener(mDrawerToggle);
setUpDrawerToggle();
if (savedInstanceState != null && savedInstanceState.containsKey(NAV_POSITION_KEY)){
sNavPosition = savedInstanceState.getInt(NAV_POSITION_KEY);
}
new DrawerItemClickListener().selectItem(sNavPosition);
}
private void setUpDrawerToggle(){
mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout,toolbar,R.string.app_name,R.string.app_name);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mDrawerToggle.setDrawerIndicatorEnabled(true);
mDrawerToggle.syncState();
}
@Override
protected void onPostCreate(@Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
mDrawerToggle.syncState();
}
private void setUpToolbar(){
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
@Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
super.onSaveInstanceState(outState, outPersistentState);
outState.putInt(NAV_POSITION_KEY,sNavPosition);
}
我已经排除了关于导航点击监听器的不必要代码。
如有任何帮助或建议,我们将不胜感激。谢谢。
最佳答案
尝试删除 getSupportActionBar().setDisplayHomeAsUpEnabled(true);
和
mDrawerToggle.setDrawerIndicatorEnabled(true);
来自你的
setUpDrawerToggle();
方法
Edit: setDisplayHomeAsUpEnabled(false) hides the default back button
关于java - 主页按钮在旋转时从抽屉图标变为向上按钮 - 仅当抽屉导航打开时,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/45677186/