问题描述
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()
}
}