英文:
Two oncreate(bundle savedinstancestate) in the same activity?
问题
我对Android开发非常陌生，遇到了一个问题，我似乎无法解决或理解解决方案。
我尝试在具有底部导航栏的活动中添加导航抽屉到Java程序中。XML部分看起来很好，也能正常工作，但是下面的Java代码报告以下错误：
'onCreate(Bundle)' 在 'MyApp' 中已经定义
我理解并且能够看到这个问题，但是我不知道如何解决它 - 是否可能？
public class Dash extends AppCompatActivity {
private DrawerLayout drawer;
Button signout;
ChipNavigationBar chipNavigationBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
signout=findViewById(R.id.logout);
signout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FirebaseAuth.getInstance().signOut();
startActivity(new Intent(getApplicationContext(),Existing.class));
finish();
}
});
chipNavigationBar = findViewById(R.id.bottom_nav_menu);
chipNavigationBar.setItemSelected(R.id.bottom_nav_menu, true);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new NewsFragment()).commit();
bottomMenu();
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
}
private void bottomMenu() {
chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
@Override
public void onItemSelected(int i) {
Fragment fragment = null;
switch (i) {
case R.id.bottom_nav_menu:
fragment = new HomeFragment();
break;
case R.id.bottom_nav_news:
fragment = new NewsFragment();
break;
case R.id.bottom_nav_profile:
fragment = new ProfileFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).commit();
}
});
}
@Override
public void onBackPressed(){
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
英文:
I'm very new to android development and have ran into an issue that I can't seem to get around or get my head around the resolution.
I'm trying to add a navigation drawer to an activity that has a bottom navigation bar in the java program. I've got the XML looking good and working but the below java is reporting the following error:
'onCreate(Bundle)' is already defined in 'MyApp'
which I understand and can see but I don't know how to resolve it - is it possible?
public class Dash extends AppCompatActivity {
private DrawerLayout drawer;
Button signout;
ChipNavigationBar chipNavigationBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
signout=findViewById(R.id.logout);
signout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FirebaseAuth.getInstance().signOut();
startActivity(new Intent(getApplicationContext(),Existing.class));
finish();
}
});
chipNavigationBar = findViewById(R.id.bottom_nav_menu);
chipNavigationBar.setItemSelected(R.id.bottom_nav_menu, true);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new NewsFragment()).commit();
bottomMenu();
}
private void bottomMenu() {
chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
@Override
public void onItemSelected(int i) {
Fragment fragment = null;
switch (i) {
case R.id.bottom_nav_menu:
fragment = new HomeFragment();
break;
case R.id.bottom_nav_news:
fragment = new NewsFragment();
break;
case R.id.bottom_nav_profile:
fragment = new ProfileFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).commit();
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
}
@Override public void onBackPressed(){
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
答案1
得分: 1
移除一个 OnCreate(....)
尝试以下代码：
public class Dash extends AppCompatActivity {
private DrawerLayout drawer;
Button signout;
ChipNavigationBar chipNavigationBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
signout=findViewById(R.id.logout);
drawer = findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
signout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FirebaseAuth.getInstance().signOut();
startActivity(new Intent(getApplicationContext(),Existing.class));
finish();
}
});
chipNavigationBar = findViewById(R.id.bottom_nav_menu);
chipNavigationBar.setItemSelected(R.id.bottom_nav_menu, true);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new NewsFragment()).commit();
bottomMenu();
}
private void bottomMenu() {
chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
@Override
public void onItemSelected(int i) {
Fragment fragment = null;
switch (i) {
case R.id.bottom_nav_menu:
fragment = new HomeFragment();
break;
case R.id.bottom_nav_news:
fragment = new NewsFragment();
break;
case R.id.bottom_nav_profile:
fragment = new ProfileFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).commit();
}
});
}
@Override public void onBackPressed(){
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
英文:
Remove one OnCreate(....)
Try Below Code:
public class Dash extends AppCompatActivity {
private DrawerLayout drawer;
Button signout;
ChipNavigationBar chipNavigationBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dash);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
signout=findViewById(R.id.logout);
drawer = findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
signout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FirebaseAuth.getInstance().signOut();
startActivity(new Intent(getApplicationContext(),Existing.class));
finish();
}
});
chipNavigationBar = findViewById(R.id.bottom_nav_menu);
chipNavigationBar.setItemSelected(R.id.bottom_nav_menu, true);
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new NewsFragment()).commit();
bottomMenu();
}
private void bottomMenu() {
chipNavigationBar.setOnItemSelectedListener(new ChipNavigationBar.OnItemSelectedListener() {
@Override
public void onItemSelected(int i) {
Fragment fragment = null;
switch (i) {
case R.id.bottom_nav_menu:
fragment = new HomeFragment();
break;
case R.id.bottom_nav_news:
fragment = new NewsFragment();
break;
case R.id.bottom_nav_profile:
fragment = new ProfileFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, fragment).commit();
}
});
}
@Override public void onBackPressed(){
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
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