Question

我一直试图获取导航抽屉中菜单的单击事件，但是它不起作用。

这是我的main_activity

package com.example.administrator.myapplication;

import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.design.widget.NavigationView;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements 
NavigationView.OnNavigationItemSelectedListener {

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


@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
    switch (menuItem.getItemId()) {
        case R.id.nav_item_one: {
            Intent intent = new Intent(this, first_activity.class);
            this.startActivity(intent);
            Toast.makeText(Beer.this, "This is my navigation Toast message!",
                    Toast.LENGTH_LONG).show();
            break;
        }
        case R.id.nav_item_two:{
            Intent intent = new Intent(this, second_activity.class);
            this.startActivity(intent);
            break;
        }
    }
    return true;
}


private void setNavigationViewListener() {
    NavigationView navigationView = findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);
}
}

这是activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
android:theme="@style/AppTheme"
tools:context=".MainActivity">

<include
    layout="@layout/app_bar_main"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    android:focusable="true"
    app:elevation="20dp"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer">

</android.support.design.widget.NavigationView>

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginTop="?attr/actionBarSize">

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/main_heading"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginBottom="8dp"
            android:text="@string/main_heading"
            android:textAlignment="center"
            android:textColor="@color/pink"
            android:textSize="30sp" />

        <ImageView
            android:id="@+id/header_image"
            android:layout_width="wrap_content"
            android:layout_height="248dp"
            android:layout_below="@id/main_heading"
            android:layout_marginBottom="8dp"
            android:contentDescription="@string/main"
            android:outlineAmbientShadowColor="@color/colorPrimary"
            android:src="@drawable/image_header" />

        <View
            android:id="@+id/divider"
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:layout_below="@id/header_image"
            android:background="?android:attr/listDivider" />

        <TextView
            android:id="@+id/main_description_1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/divider"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:layout_marginEnd="16dp"
            android:layout_marginBottom="8dp"
            android:text="@string/beer_description_paragraph_1" />

    </RelativeLayout>
</ScrollView>


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

这是activity_main_drawer.xml

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:androud="http://schemas.android.com/apk/res-auto">
<group android:checkableBehavior="single">
    <item android:id="@+id/nav_item_one"
        android:title="@string/item_one"/>
    <item android:id="@+id/nav_item_two"
        android:title="@string/item_two"/>
</group>

我可以看到抽屉中的所有项目，当我单击某个项目时，抽屉将关闭，仅此而已，相关联的操作并未执行。

Answer 1

您需要使用在activity_main_drawer菜单中声明的相同ID。这样就可以了：

@Override
public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
    switch (menuItem.getItemId()) {
        case R.id.nav_beer: {
            Intent intent = new Intent(this, first_activity.class);
            this.startActivity(intent);
            Toast.makeText(Beer.this, "This is my navigation Toast message!",
                    Toast.LENGTH_LONG).show();
            break;
        }
        case R.id.nav_brandy:{
            Intent intent = new Intent(this, second_activity.class);
            this.startActivity(intent);
            break;
        }
    }
    return true;
}

NavigationDrawer中菜单项的onClick事件不起作用

1 个答案: