这个问题已被问过1000次,阅读了很多之后,我仍然{@ {1}}错误和黑眼睛仍然在这里。
据我了解,我必须创建一个No drawer view found with gravity LEFT
:
menu/drawer_layout.xml
然后我必须对我的<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
tools:showIn="navigation_view">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_add"
android:icon="@drawable/plus"
android:title="Add" />
<item
android:id="@+id/nav_modify"
android:icon="@drawable/pencil"
android:title="Modify" />
<item
android:id="@+id/nav_search"
android:icon="@drawable/search"
android:title="Search"
tools:ignore="DuplicateIds" />
<item
android:id="@+id/nav_settings"
android:title="Settings" />
</group>
</menu>
进行一些修改以适合抽屉:
main_activity.xml
那我应该只修改<?xml version="1.0" encoding="utf-8"?>
<androidx.drawerlayout.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_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity"
tools:openDrawer="start">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context=".MainActivity">
<androidx.appcompat.widget.Toolbar
android:id="@+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#FF0A0A"
android:elevation="4dp"
android:theme="@style/ThemeOverlay.AppCompat.ActionBar"
app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="auto"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.977"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.499"
app:srcCompat="@android:drawable/ic_input_add" />
<EditText
android:id="@+id/editText2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:ems="10"
android:inputType="textPersonName"
android:text="Custom list:"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/listSimple" />
<ListView
android:id="@+id/listSimple"
android:layout_width="403dp"
android:layout_height="202dp"
android:layout_marginTop="16dp"
android:gravity="center_horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText">
</ListView>
<ListView
android:id="@+id/customListView"
android:layout_width="408dp"
android:layout_height="294dp"
android:gravity="center_horizontal"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.333"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/editText2"
app:layout_constraintVertical_bias="0.157">
</ListView>
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPersonName"
android:text="Simple list:"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.119"
tools:layout_editor_absoluteX="0dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
</RelativeLayout>
</androidx.drawerlayout.widget.DrawerLayout>
中的一个小东西以使其正确吗?
main_activity.java
当我看到左侧的汉堡包时,我感到非常高兴,但是当我单击鼠标时,我就看到了错误消息,那么我是怎么做的呢?