我正在尝试过去两天，在我的抽屉活动旁边添加片段，以使导航抽屉在整个应用程序中可见。我已经尝试了stackoverflow中的几种方法以及许多其他方法，但是仍然没有成功。之后，我必须从第一个片段移到第二个片段，依此类推，直到需要导航抽屉为止。从活动转到任何片段时，我想替换除抽屉以外的整个视图。每个片段都有自己的layout.xml，就像活动一样（线性/相对布局作为父级）。
抽屉活动性：
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
DrawerLayout drawer = (DrawerLayout) 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();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
Button btnfragOne = (Button) findViewById(R.id.btnfrag_one);
btnfragOne.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
FragOne fragment = new FragOne();
getSupportFragmentManager().beginTransaction()
.replace(R.id.frag2, fragment, fragment.getClass().getSimpleName()).addToBackStack(null).commit();
}
});
}
第一片段类：
public class FragOne extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.frag_one, container, false);
}
//第二个Fragment类：
public class FragTwo extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.frag_two, container, false);
}
只需完成此任务，您就必须重写onNavigationItemSelected方法Activity，该方法在上返回选定片段的ID NavigationDrawer。
试试这个，
@Override
public boolean onNavigationItemSelected(MenuItem item) {
//calling the method displayselectedscreen and passing the id of selected menu
displaySelectedFragment(item.getItemId());
return true;
}
现在displaySelectedFragment，
private void displaySelectedScreen(int itemId) {
//creating fragment object
Fragment fragment = null;
//initializing the fragment object which is selected
switch (itemId) {
case R.id.your_fragment_one_id:
fragment = new FragOne();
break;
case R.id.your_fragment_two_id:
fragment = new FragTwo();
break;
}
//replacing the fragment
if (fragment != null) {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.main_layout_id_which_is_to_be_replace, fragment);
ft.commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.your_drawer_layout_id);
drawer.closeDrawer(GravityCompat.START);
}
编辑-如果要从导航FragOne到FragTwo。试试这个，
在中创建一个方法Activity，
public void showFragTwo(){
FragmentManager manager = getSupportFragmentManager();
FragTwo frag = new FragTwo();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.your_layout_id_which_is_to_be_replace, frag);
transaction.commit();
}
然后在您FragOne要启动时FragTwo，startFragTwo从Activityas调用方法，
((YourActivity) getActivity()).showFragTwo();
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我来说两句