Question

当我转到另一个片段，然后将其更改为“后退”图标时，如何从NavigationView中删除Hamburger图标？ ///////////////////////////////////////////////////// ///////////////////////////////////////////////////// ///////////////////////////////////////////////////// ////

我一直在添加以下代码，以便他们可以将汉堡包图标替换为返回图标：

navigation.menu.getItem(1).setOnMenuItemClickListener() { //I miss an error
        toogle.isDrawerIndicatorEnabled = false

    }

navigation.menu.getItem(1).setOnMenuItemClickListener {
        supportActionBar?.setHomeButtonEnabled(true)
        supportActionBar?.setDisplayHomeAsUpEnabled(true)
        supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_return) //I miss an error
    }

navigation.menu.getItem(2).setOnMenuItemClickListener {
            supportActionBar?.setHomeButtonEnabled(true)
            supportActionBar?.setDisplayHomeAsUpEnabled(true)
            supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_return) //I miss an error
        }

navigation.menu.getItem(3).setOnMenuItemClickListener {
            supportActionBar?.setHomeButtonEnabled(true)
            supportActionBar?.setDisplayHomeAsUpEnabled(true)
            supportActionBar?.setHomeAsUpIndicator(R.drawable.ic_return) //I miss an error
        }

NavigationActivity.kt：

package com.example.gonzalo.proyecto_android_2018.activities

import android.support.v4.app.Fragment
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.design.widget.NavigationView
import android.support.v4.view.GravityCompat
import android.support.v7.app.ActionBarDrawerToggle
import android.support.v7.widget.Toolbar
import android.view.MenuItem
import com.example.gonzalo.proyecto_android_2018.R
import com.example.gonzalo.proyecto_android_2018.fragments.*
import kotlinx.android.synthetic.main.activity_navigation.*

class NavigationActivity : AppCompatActivity(), NavigationView.OnNavigationItemSelectedListener{

lateinit var tb:Toolbar

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_navigation)

    //SETUP TOOLBAR
    tb = toolbar as Toolbar
    //tb.title = "LIGHT BUS"

    //SETUP NAVIGATIONVIEW
    setupNavigation()

    setupFragment(HomeFragment())

    navigation.menu.getItem(0).isChecked = true
}

private fun setupNavigation() {

    //THERE IS NO TOGY CLASS, I SAY IT NOT TO BE CONFUSED WITH THE VARIABLE "toogle"
    val toogle = ActionBarDrawerToggle(this, drawer, tb, R.string.drawerAbierto, R.string.drawerCerrado)

    toogle.isDrawerIndicatorEnabled = true //HERE I SAY THAT THE SANDWICHITO SYMBOL APPEARS TO OPEN AND CLOSE THE NAVIGATIONVIEW

    drawer.addDrawerListener(toogle)
    toogle.syncState() //HERE I SAY TO SYNCHRONIZE THE STATE OPEN OR CLOSED. EXAMPLE, MUST CLOSE WHEN OPEN AND MUST BE OPEN WHEN CLOSED

    navigation.setNavigationItemSelectedListener(this) //HERE I SAY TO THIS NAVIGATION (navigation) THAT IT WILL BE ALREADY ADDED WITHIN NAVIGATION ACTIVITY
}

private fun setupFragment(fragment: Fragment){       //Replace the "R.id.frameLayout" with the id of the "fragment" that will be placed in the "activity_navigation.xml"
    supportFragmentManager.beginTransaction().replace(R.id.frameLayout, fragment).commit()
}

override fun onNavigationItemSelected(item: MenuItem): Boolean {
    when(item.itemId){
        R.id.home -> setupFragment(HomeFragment())
        R.id.mi_cuenta -> setupFragment(MiCuentaFragment())
        R.id.pagos -> setupFragment(PagosFragment())
        R.id.promociones -> setupFragment(PromocionesFragment())
        R.id.regalo_amigo -> setupFragment(RegaloAmigoFragment())
        R.id.ayuda -> setupFragment(AyudaFragment())
    }
    drawer.closeDrawer(GravityCompat.START) //HERE I SAY, AFTER YOU HAVE CHANGED FRAGMENT, CLOSE THE DRAWER
    return true
}

override fun onBackPressed() {
    if(drawer.isDrawerOpen(GravityCompat.START)){
        drawer.closeDrawer(GravityCompat.START)
    }

    else{
        super.onBackPressed()
    }
}

}

activity_navigation.xml：

<?xml version="1.0" encoding="utf-8"?>

<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
>

<android.support.constraint.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <include
        android:id="@+id/toolbar"
        layout="@layout/toolbar"/>

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="?attr/actionBarSize">

    </FrameLayout>

</android.support.constraint.ConstraintLayout>

<android.support.design.widget.NavigationView
    android:id="@+id/navigation"
    app:itemTextColor="#009688"
    app:menu="@menu/main_menu"
    app:headerLayout="@layout/nav_header"
    android:fitsSystemWindows="true"
    android:layout_gravity = "start"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"/>

</android.support.v4.widget.DrawerLayout>

如何删除汉堡包图标并放上后退图标[Android]

0 个答案: