这个问题在这里已有答案：
当我单击导航抽屉菜单时，抽屉将关闭但不执行任何操作。在我的情况下，它必须转移到另一个活动/干杯消息，但两个都没有完成。采取点击操作，但没有得到响应。
我希望在单击导航菜单时更改活动。建议所需的更改以使抽屉作为活动切换器工作
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener,NavigationView.OnNavigationItemSelectedListener
{
private DrawerLayout drawer;
private WebView webView;
private String currentURL = "";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// code for side bar
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = findViewById(R.id.drawer_layout);
NavigationView navigationView = findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
navigationView.setVerticalFadingEdgeEnabled(true);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar,
R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
webView = findViewById(R.id.webView);
swipe = (SwipeRefreshLayout) findViewById(R.id.swipe);
swipe.setOnRefreshListener((SwipeRefreshLayout.OnRefreshListener) this);
// Define url that will open in webview
String webViewUrl = "http://www.tekies.online";
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setLoadWithOverviewMode(true);
webView.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
webView.setScrollbarFadingEnabled(false);
// webView.getSettings().setBuiltInZoomControls(true);
webView.getSettings().setPluginState(PluginState.ON);
webView.getSettings().setAllowFileAccess(true);
webView.getSettings().setSupportZoom(true);
}
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
//here is the main place where we need to work on.
int id=item.getItemId();
switch (id){
case R.id.nav_home:
Intent h= new Intent(this,MainActivity.class);
startActivity(h);
break;
case R.id.nav_profile:
Intent i= new Intent(this,settings.class);
startActivity(i);
break;
case R.id.nav_chat:
Intent g= new Intent(this,settings.class);
startActivity(g);
break;
case R.id.nav_share:
Toast.makeText(getApplicationContext(), "No Link to Share!", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_send:
String link = "http://tekies.online/app";
Intent referIntent = new Intent(Intent.ACTION_SEND);
referIntent.setType("text/plain");
referIntent.putExtra(Intent.EXTRA_TEXT,link); // your above url
startActivity(Intent.createChooser(referIntent, "Share link using...."));
break;
case R.id.nav_message:
Intent m= new Intent(this,settings.class);
startActivity(m);
break;
case R.id.rate:
Toast.makeText(getApplicationContext(), "Rate us!", Toast.LENGTH_SHORT).show();
break;
case R.id.exit:
AlertDialog.Builder dialog = new AlertDialog.Builder(this);
dialog.setTitle("Exit App Confirmation");
dialog.setMessage("Are you sure ?");
dialog.setPositiveButton("YES", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
onBackPressed();
Toast.makeText(getApplicationContext(), "App Closed!", Toast.LENGTH_SHORT).show();
}
});
dialog.setCancelable(false);
dialog.setNegativeButton("NO", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
Toast.makeText(getApplicationContext(), "Operation Canceled!", Toast.LENGTH_SHORT).show();
}
}).show();
break;
}
DrawerLayout drawer = findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}