Question

我正在尝试为我的KeyboardView设置自定义背景。设置XML属性keyBackground似乎是解决这个问题的方法，但是当我尝试给drawable充气时，我在logcat中不断得到NullPointerException斜杠ResourceNotFoundException。我不确定是什么问题 - 所有文件似乎都在正确的位置。我把它们放在多个可绘制的文件夹中，清理了我的项目等等。

main.xml文件：

<android.inputmethodservice.KeyboardView
    android:id="@+id/keyboardView"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:focusable="true"
    android:focusableInTouchMode="true"
    android:visibility="gone"
    android:keyBackground="@drawable/keybg" />

keybg.xml文件：

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

<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item
        android:state_pressed="true"
        android:drawable="@drawable/keybg_pressed" />
    <item
        android:drawable="@drawable/keybg_notpressed" />
</selector>

keybg_pressed和keybg_notpressed都是png文件

（相关）logcat：

E/AndroidRuntime(17772): FATAL EXCEPTION: main
E/AndroidRuntime(17772): java.lang.RuntimeException: Unable to start activity   
    ComponentInfo{MainActivity}: android.view.InflateException:   
    Binary XML file line #620: Error inflating class 
    android.inputmethodservice.KeyboardView

E/AndroidRuntime(17772): Caused by: android.content.res.Resources$NotFoundException: File   
    res/drawable/keybg.xml from drawable resource ID #0x7f0201a3
E/AndroidRuntime(17772):    at   
    android.content.res.Resources.loadDrawable(Resources.java:1947)
E/AndroidRuntime(17772):    at 
    android.content.res.TypedArray.getDrawable(TypedArray.java:601)
E/AndroidRuntime(17772):    at android.inputmethodservice.KeyboardView.<init>    
    (KeyboardView.java:303)
E/AndroidRuntime(17772):    at android.inputmethodservice.KeyboardView.<init>  
    (KeyboardView.java:279)
E/AndroidRuntime(17772):    ... 28 more
E/AndroidRuntime(17772): Caused by: java.lang.NullPointerException
E/AndroidRuntime(17772):    at  
    android.graphics.drawable.DrawableContainer$DrawableContainerState.
    addChild(DrawableContainer.java:524)
E/AndroidRuntime(17772):    at  
 android.graphics.drawable.StateListDrawable$StateListState.addStateSet(StateListDrawable.java:278)
E/AndroidRuntime(17772):    at   
    android.graphics.drawable.StateListDrawable.inflate(StateListDrawable.java:186)
E/AndroidRuntime(17772):    at  
    android.graphics.drawable.Drawable.createFromXmlInner(Drawable.java:881)
E/AndroidRuntime(17772):    at   
    android.graphics.drawable.Drawable.createFromXml(Drawable.java:818)
E/AndroidRuntime(17772):    at  
     android.content.res.Resources.loadDrawable(Resources.java:1944)
E/AndroidRuntime(17772):    ... 31 more

Answer 1

你说＆＃34; keybg_pressed和keybg_notpressed都是png文件＆＃34;。

它们应该是XML文件！（我知道这很奇怪。）

我将其用于自定义键盘视图：

    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/keyboardView"
    android:layout_alignParentBottom="true"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:keyBackground="@drawable/samplekeybackground"
    android:keyTextColor="@android:color/white"
    android:keyPreviewLayout="@layout/input_key_preview" 
    android:background="@drawable/keyboardbackground"

Answer 2

在res中创建一个文件夹并创建一个xml文件，如：

<!-- Functional keys. -->

<item android:state_single="true" android:state_pressed="true"
      android:drawable="@drawable/btn_keyboard_key_dark_pressed_holo" />
<item android:state_single="true"
      android:drawable="@drawable/btn_keyboard_key_dark_normal_holo" />

<!-- Toggle keys. Use checkable/checked state. -->
<!-- The lock icon is a copy of the 'on' icon, hue shifted by +164 using Gimp's Colors/Hue&Saturation -->

<item android:state_checkable="true" android:state_checked="true" android:state_pressed="true"
      android:drawable="@drawable/btn_keyboard_key_dark_pressed_on_holo" />
<item android:state_checkable="true" android:state_pressed="true"
      android:drawable="@drawable/btn_keyboard_key_dark_pressed_off_holo" />
<item android:state_checkable="true" android:state_checked="true" android:state_active="true"
      android:drawable="@drawable/btn_keyboard_key_dark_normal_lock_holo" />
<item android:state_checkable="true" android:state_checked="true"
      android:drawable="@drawable/btn_keyboard_key_dark_normal_on_holo" />
<item android:state_checkable="true"
      android:drawable="@drawable/btn_keyboard_key_dark_normal_off_holo" />

<!-- Normal keys. -->

<item android:state_pressed="true"
      android:drawable="@drawable/btn_keyboard_key_light_pressed_holo" />
<item android:drawable="@drawable/btn_keyboard_key_light_normal_holo" />

以上图片存在于drawable-hdi png

中

KeyboardView没有采用XML属性keyBackground

2 个答案: