Question

I am having weird stack trace from my application in the android market.
I have a view switcher which contains two views, one of them contains a checkbox.

I am getting this stack trace AdDetailView beeing a custom view.

  android.view.InflateException: Binary XML file line #29: Error inflating class android.widget.CheckBox
  at android.view.LayoutInflater.createView(LayoutInflater.java:513)
  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:563)
  at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
  at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
  at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
  at android.view.LayoutInflater.rInflate(LayoutInflater.java:621)
  at android.view.LayoutInflater.inflate(LayoutInflater.java:382)
  at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
  at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
  at com.yakaz.view.AdDetailView.init(AdDetailView.java:67)
  at com.yakaz.view.AdDetailView.<init>(AdDetailView.java:78)

This happens in the following view contructor :

private void init(Context context) {
    LayoutInflater li = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    li.inflate(R.layout.ad_detail_view, this);
    setOrientation(LinearLayout.VERTICAL);
}

public AdDetailView(Context context, AttributeSet attrs) {
    super(context, attrs);
    init(context);
}

The line 67 is the inflate line.

The problem is that i can’t reproduce the problem, on emulator or device.
Any pointers ?

Here is the ad_detail_view.xml

<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<TextView android:layout_width="fill_parent"
    android:layout_height="wrap_content" android:id="@+id/preview_warning"
    style="@style/Notification" android:text="@string/this_is_only_a_preview"
    android:visibility="gone" />

<ScrollView android:layout_width="fill_parent"
    android:fadingEdge="none" android:layout_height="fill_parent"
    android:layout_weight="1" android:fillViewport="true" android:id="@+id/scrolls">
    <LinearLayout android:layout_width="fill_parent"
        android:layout_height="fill_parent" android:orientation="vertical">

        <include layout="@layout/action_bar" />

        <LinearLayout android:orientation="horizontal"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:paddingTop="10dp" android:paddingLeft="10dp"
            android:paddingRight="10dp">
            <!--  tags -->
            <LinearLayout android:id="@+id/tagsLayout"
                android:orientation="horizontal" android:layout_width="fill_parent"
                android:layout_weight="1" android:layout_height="wrap_content" />
            <CheckBox android:id="@+id/save_button" style="@style/StarButton"
                android:layout_marginRight="10sp" />
        </LinearLayout>


        <!--  meta -->
        <Button android:id="@+id/meta" style="@style/Meta"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"/>


        <!-- pictures -->
        <LinearLayout android:orientation="horizontal"
            android:layout_width="fill_parent" android:layout_height="wrap_content"
            android:gravity="center" android:id="@+id/gallery_container">
            <Gallery android:id="@+id/gallery" android:layout_width="fill_parent"
                android:layout_height="wrap_content" />
        </LinearLayout>


        <!--  padded layout -->
        <LinearLayout android:layout_width="fill_parent"
            android:layout_height="wrap_content" android:orientation="vertical"
            android:padding="5dp">

            <!-- summary -->
            <TextView android:id="@+id/summary" style="@style/AdDetailSummary"
                android:layout_width="fill_parent" android:layout_height="wrap_content"
                android:paddingBottom="10dp" />


        </LinearLayout>


        <!--  tab -->
        <LinearLayout android:layout_width="fill_parent"
            android:orientation="vertical" android:layout_height="wrap_content"
            android:background="@drawable/bottom_green_bar" android:paddingLeft="10dp">
            <TextView android:layout_width="wrap_content" android:id="@+id/tab_title"
                android:gravity="center" android:layout_height="wrap_content"
                android:text="@string/member_profile" style="@style/TabLabel" />
        </LinearLayout>

        <!-- user detail -->
        <LinearLayout android:layout_width="fill_parent"
            android:orientation="vertical" android:layout_height="wrap_content"
            android:background="@color/very_light_gray" android:paddingBottom="10dp">
            <!--  user item -->

            <include layout="@layout/user_item" />
            <include layout="@layout/website_item" />

        </LinearLayout>
    </LinearLayout>
</ScrollView>
</merge>

style.xml :

<style name="StarButton">
    <item name="android:background">@drawable/bk_star_button</item>
    <item name="android:layout_width">30dp</item>
    <item name="android:layout_height">30dp</item>
    <item name="android:button">@android:id/empty</item>
</style>

bk_star_button.xml:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:drawable="@drawable/btn_star_big_off"
      android:state_checked="false"/>
    <item android:drawable="@drawable/btn_star_big_on"
      android:state_checked="true"/>          
</selector>

here is another layout that as the exact same exception raised on some device :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent"
android:orientation="vertical" android:background="@drawable/bk_gradient">
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:gravity="left|center_vertical" style="@style/TopBar"
        android:id="@+id/titlebar">
        <ImageView android:src="@drawable/logo" android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:background="@null"
        android:layout_alignParentLeft="true" />

        <FrameLayout android:layout_width="wrap_content"
        android:layout_height="wrap_content" android:layout_centerVertical="true"
        android:paddingLeft="8dp" android:id="@+id/search_progressbar"
        android:visibility="gone">
            <ProgressBar android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            style="@style/ProgressBarMedium" />
        </FrameLayout>

    <LinearLayout android:id="@+id/buttons_container"
    android:gravity="right|center_vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" />
</LinearLayout>
    ....
</LinearLayout>
</LinearLayout>

the code that raises the exception :

public static CompoundButton addTitleBarCompoundButton(Context context,
        View titleBar, CharSequence label, boolean isChecked) {
    if (!(titleBar instanceof ViewGroup))
        return null;

    ViewGroup group = (ViewGroup) titleBar
            .findViewById(R.id.buttons_container);

    // We attach to root during the inflating process othersize layout_
    // parameters in the style are ignored
    LayoutInflater.from(context).inflate(R.layout.topbar_toggle_button,
            group, true);

    // Get the result, which is the last child of the group
    CompoundButton result = (CompoundButton) group.getChildAt(group
            .getChildCount() - 1);
    result.setChecked(isChecked);

    // Set the text
    result.setText(label);
    return result;
}

topbar_toggle_button.xml :

<?xml version="1.0" encoding="utf-8"?>
<CheckBox xmlns:android="http://schemas.android.com/apk/res/android" style="@style/BarButton.Toggle"/>

Answer 1

I suspect it has something to do with you setting the android:button parameter to @android:id/empty. Can you elaborate on why you are doing this? It seems to me that you have created custom checked/unchecked views via a <selector> on the background, so the button element should be cleared out. If my assumption is correct, you should do that in this fashion:

<style name="StarButton">
  <item name="android:background">@drawable/bk_star_button</item>
  <item name="android:layout_width">30dp</item>
  <item name="android:layout_height">30dp</item>
  <item name="android:button">@null</item>
</style>

The @null attribute is provided as a way to clear default attributes, whereas @android:id/empty is the id used by the system to reference the “empty” view that is presented by AdapterView instances when they have no items to display. This discrepancy could cause a host of unknown behaviors.