Javascript 不可访问语句，menuItem.setActionView（R.layout.theme\u开关）； 第一节

包com.gmsofficial.gmsofficial

 import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.view.MenuItem;
 import android.widget.CompoundButton;
 import android.widget.Switch;

 import androidx.annotation.NonNull;
 import androidx.appcompat.app.ActionBarDrawerToggle;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.app.AppCompatDelegate;
 import androidx.appcompat.widget.Toolbar;
 import androidx.drawerlayout.widget.DrawerLayout;

第二节

导入com.google.android.material.navigation.NavigationView

 public class NavigationDrawer extends AppCompatActivity {


 DrawerLayout drawerLayout;
 ActionBarDrawerToggle actionBarDrawerToggle;
 NavigationView navigationView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_navigation_drawer);

    if (loadState() == true){
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
        setTheme(R.style.darkTheme);
    } else {
        AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
        setTheme(R.style.Theme_AppCompat);
    }

    setUpToolbar();
    navigationView = (NavigationView) findViewById(R.id.navigation_menu);
    navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
      

     

3.3第三节

    @Override
        public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
            switch (menuItem.getItemId())
            {
                case R.id.nav_home:

                    Intent intent = new Intent(NavigationDrawer.this, NavigationDrawer.class);
                    startActivity(intent);
                    break;

                case R.id.nav_Website:

                    intent = new Intent(NavigationDrawer.this, Websitewebview.class);
                    startActivity(intent);
                    break;

                case R.id.nav_Mobiles:

                    intent = new Intent(NavigationDrawer.this, Mobileswebview.class);
                    startActivity(intent);
                    break;

             

第四节

            case R.id.nav_TechNews:

                intent = new Intent(NavigationDrawer.this, TechNewswebview.class);
                startActivity(intent);
                break;

            case R.id.nav_Gadgets:

                intent = new Intent(NavigationDrawer.this, Gadgetswebview.class);
                startActivity(intent);
                break;

            case R.id.nav_CustomROM:

                intent = new Intent(NavigationDrawer.this, CustomRomwebview.class);
                startActivity(intent);
                break;

                menuItem.setActionView(R.layout.theme_switch);
                final Switch themeswitch = (Switch) menuItem.getActionView().findViewById(R.id.action_switch);
                if (loadState() == true){
                    themeswitch.setChecked(true);
        }

不可达错误部分

                    themeswitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                    @Override
                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                        if (isChecked) {
                            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
                            saveState(true);
                            recreate();
                        } else {
                            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
                            saveState(false);
                        }
                    }
                });
                break;

            case R.id.nav_AboutUs:

                intent = new Intent(NavigationDrawer.this, AboutUS.class);
                startActivity(intent);
                break;

第六节 //粘贴您的隐私策略链接

//案例R.id.nav_政策：{ // //Intent browserIntent=新意图（Intent.ACTION\u视图，Uri.parse（“”）； //startActivity（浏览器内容）； // // } //中断； 案例R.id.nav_份额：{

     Intent sharingIntent = new Intent(android.content.Intent.ACTION_SEND);
     sharingIntent.setType("text/plain");
     String shareBody =  "http://play.google.com/store/apps/detail?id=" + getPackageName();
     String shareSub = "Try now";
     sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, shareSub);
     sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, shareBody);
     startActivity(Intent.createChooser(sharingIntent, "Share using"));

          }
            break;
        }
        return false;
    }
});

}

第七节

public void setUpToolbar() {
drawerLayout = findViewById(R.id.drawerLayout);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.app_name, R.string.app_name);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
actionBarDrawerToggle.getDrawerArrowDrawable().setColor(getResources().getColor(R.color.purple));
actionBarDrawerToggle.syncState();

}

}

} }

---

我猜你不知道

break

做什么？这两行紧挨着一行，编译器/编辑器正好指向它。break将完全跳出

switch

语句，该

菜单项…

行无法运行，这就是为什么编译器告诉您：“这不可能是正确的；我不会再帮您挖这个坟墓了。”

请解决我的错误我们不知道代码之间的关系。它在一个文件中吗？用一种方法？我们也不知道你的错误是从哪里来的为什么请帮忙me@Adi你的问题相当于：“请教我java”。这对于stackoverflow问题来说有点太宽泛了，但是有很多教程！

private void saveState(Boolean state){
SharedPreferences sharedPreferences = getSharedPreferences("GmS Official", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putBoolean("NightMode", state);
editor.apply();

 private Boolean loadState(){
SharedPreferences sharedPreferences = getSharedPreferences("GmS Official", MODE_PRIVATE);
Boolean state = sharedPreferences.getBoolean("NightMode", false);
return state;

break;
menuItem.setActionView(R.layout.theme_switch);