android - InflateException 扩展 android.preference.ListPreference

Question

我正在扩展 ListPreference 以添加在选定条目更改时更改首选项摘要的功能。到目前为止，我只扩展了类、提供了构造函数并设置了一些选项。当我运行在 XML 中引用此类的 Activity 时，应用程序崩溃并出现 InflateException:

E/AndroidRuntime( 1542): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.grooveshark.android.radio/com.grooveshark.android.radio.activity.SettingsActivity}: android.view.InflateException: Binary XML file line #88: Error inflating class HighQualityPreference
E/AndroidRuntime( 1542):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1768)
E/AndroidRuntime( 1542):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
E/AndroidRuntime( 1542):    at android.app.ActivityThread.access$1500(ActivityThread.java:123)
E/AndroidRuntime( 1542):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
E/AndroidRuntime( 1542):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 1542):    at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime( 1542):    at android.app.ActivityThread.main(ActivityThread.java:3835)
E/AndroidRuntime( 1542):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 1542):    at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime( 1542):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
E/AndroidRuntime( 1542):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
E/AndroidRuntime( 1542):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 1542): Caused by: android.view.InflateException: Binary XML file line #88: Error inflating class HighQualityPreference

这是Java:

public class HighQualityPreference extends ListPreference
{
    public HighQualityPreference(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        // TODO Auto-generated constructor stub

        setEntries(R.array.high_quality_options);
        setEntryValues(R.array.high_quality_option_values);

        setSummary("Six squirrels while on a WiFi connection");
    }

    public HighQualityPreference(Context context)
    {
        super(context);
    }

}

这是 XML:

        <HighQualityPreference android:key="@string/prefs_high_quality_option"
            android:persistent="true" />

如您所见，我所做的只是扩展类。要向 ListPreference 添加功能，我需要做的不仅仅是扩展它吗？意思是，我是否需要覆盖任何其他函数或调用其他函数？我需要设置 XML 内容 View 吗？我确实想使用原始 XML，我只想在所选实体更改时更新摘要。

Answer 1

尝试为组件添加完全合格的包，即

<com.your.package.HighQualityPreference android:key="..." ... />