红线在“打开导航抽屉”和“关闭导航抽屉”下
import androidx.appcompat.app.ActionBarDrawerToggle;
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Menu");
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toogle = new ActionBarDrawerToggle(this,
drawer,
toolbar ,
"Open navigation drawer",
"Close navigation drawer"
);
drawer.setDrawerListener(toogle);
toogle.syncState();