转到菜单项选择 Kotlin 上的另一个活动

如何解决转到菜单项选择 Kotlin 上的另一个活动

您好，我在通过 MenuItem 转到另一个活动时遇到问题。我不知道我的代码哪里有问题，因为 Android Studio 告诉我这是意图问题。我已经在 kotlin 类的底部导入了意图。看了教程，还是代码有问题。

override fun onoptionsItemSelected(item: MenuItem): Boolean {
        return super.onoptionsItemSelected(item)
        val id = item.itemId
        if (id == R.id.btn_settings) {
            Intent intent = new Intent(this,SettingActivity.class)
                    this.startActivity(intent)
        }
        
            }

解决方法

这是一个混合的 java/kotlin 代码 .. new 是一个 java 关键字。改用下面的

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    val id = item.itemId
    if (id == R.id.btn_settings) {
        val intent = Intent(
            this,SettingActivity::class.java)
        startActivity (intent)
    }
    return true
}

,

我发现了错误，但现在导航菜单有问题。当 onOPtionsItemSelcted 在代码导航抽屉中时，它不起作用。当我移除这个片段导航抽屉时又回来了。

import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.widget.Toast
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.android.material.snackbar.Snackbar
import com.google.android.material.navigation.NavigationView
import androidx.navigation.findNavController
import androidx.navigation.ui.AppBarConfiguration
import androidx.navigation.ui.navigateUp
import androidx.navigation.ui.setupActionBarWithNavController
import androidx.navigation.ui.setupWithNavController
import androidx.drawerlayout.widget.DrawerLayout
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.Toolbar
import android.view.View
import android.content.Intent


class MainActivity : AppCompatActivity() {

    private lateinit var appBarConfiguration: AppBarConfiguration

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val toolbar: Toolbar = findViewById(R.id.toolbar)
        setSupportActionBar(toolbar)

        val fab: FloatingActionButton = findViewById(R.id.fab)
        fab.setOnClickListener { view ->
            Snackbar.make(view,"Replace with your own action",Snackbar.LENGTH_LONG)
                .setAction("Action",null).show()
        }
        val drawerLayout: DrawerLayout = findViewById(R.id.drawer_layout)
        val navView: NavigationView = findViewById(R.id.nav_view)
        val navController = findNavController(R.id.nav_host_fragment)
        // Passing each menu ID as a set of Ids because each
        // menu should be considered as top level destinations.
        appBarConfiguration = AppBarConfiguration(setOf(
            R.id.nav_home,R.id.nav_paliwo,R.id.nav_naprawa,R.id.nav_wydatki,R.id.nav_oc,R.id.nav_pt),drawerLayout)
        setupActionBarWithNavController(navController,appBarConfiguration)
        navView.setupWithNavController(navController)
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.main,menu)


            return true

    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        val id = item.itemId
        if (id == R.id.btn_settings) {
            val intent = Intent(
                    this,SettingsActivity ::class.java)
            startActivity (intent)
        }
        return true
    }

    override fun onSupportNavigateUp(): Boolean {
        val navController = findNavController(R.id.nav_host_fragment)
        return navController.navigateUp(appBarConfiguration) || super.onSupportNavigateUp()
    }
    }