[英]Creating an alternating array method in java, can you tell me where I'm going wrong?
[英]i can't make a listener on my navigation drawer, can you tell me where do i wrong?
我从空活动创建此drawer
,所以我不使用fragment
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener{
private FirebaseAuth.AuthStateListener authListener;
private FirebaseAuth auth;
private Button signOut;
private DrawerLayout nDrawer;
private ActionBarDrawerToggle nToggle;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
当我放置此setNavigaionViewListener
,此活动将在构建时崩溃,我在某处出错吗?
//setNavigationViewListner();
//get firebase auth instance
auth = FirebaseAuth.getInstance();
而且我不知道为什么,但是让当前用户无法使用,但是我不知道错误在哪里。
//get current user
final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
authListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user == null) {
// user auth state is changed - user is null
// launch login activity
startActivity(new Intent(MainActivity.this, LoginActivity.class));
finish();
}
}
};
signOut = (Button) findViewById(R.id.sign_out);
nDrawer = (DrawerLayout) findViewById(R.id.drawer);
nToggle = new ActionBarDrawerToggle(MainActivity.this,nDrawer,R.string.open,R.string.close);
nDrawer.addDrawerListener(nToggle);
nToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
signOut.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signOut();
startActivity(new Intent(MainActivity.this, LoginActivity.class));
}
});
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (nToggle.onOptionsItemSelected(item)){
return true;
}
return super.onOptionsItemSelected(item);
}
//method to set Listener
private void setNavigationViewListner() {
NavigationView navigationView = (NavigationView) findViewById(R.id.drawer);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
switch (item.getItemId()){
case R.id.account:{
startActivity(new Intent(MainActivity.this, ProfileActivity.class));
break;
}
case R.id.logout:{
signOut();
startActivity(new Intent(MainActivity.this, LoginActivity.class));
break;
}
}
nDrawer.closeDrawer(GravityCompat.START);
return true;
}
//sign out method
public void signOut() {
auth.signOut();
}
用这个
Toolbar toolbar = (Toolbar) findViewById(R.id.Yourtoolbar);
nToggle = new ActionBarDrawerToggle(
MainActivity.this, nDrawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
代替这个
nToggle = new ActionBarDrawerToggle(MainActivity.this,nDrawer,R.string.open,R.string.close);
并同时更改此删除
DrawerLayout
findViewById(R.id.drawer)
并将您的NavigationView
ID
例如
findViewById(R.id.YournavigationView);
NavigationView navigationView = (NavigationView) findViewById(R.id.YournavigationView);
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