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我一直試圖在我的應用程序的PreferenceScreen中使用標準的Android SwitchPreference。當我定義我的preferences.xml爲：使用SwitchPreference的XML屬性android：key導致我的應用程序崩潰
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<Preference
android:icon="@mipmap/ic_launcher"
android:id="@+id/pref_taoSettings_id"
android:key="pref_taoSettings_key"
android:title="@string/pref_taoSettings_title" />
<SwitchPreference
android:defaultValue="false"
android:id="@+id/pref_playLevel_id"
android:summary="Level"
android:summaryOff="@string/pref_playLevel_beginner"
android:summaryOn="@string/pref_playLevel_expert"
android:title="@string/pref_playLevel_title" />
</PreferenceScreen>
當我把我的設置活動我看到以下畫面：
[*移除對不起，我沒有10美譽，所以我無法發佈我的屏幕截圖。基本上PreferenceActivity出現在頂部的標題按鈕顯示默認圖標。在那之下，在下一個listview位置是我的SwitchPreference切換控件。我無法把文本上的控制，因爲我最小的SDK版本爲7 刪除*]
如果我再更新我的preferences.xml閱讀：
<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >
<Preference
android:icon="@mipmap/ic_launcher"
android:id="@+id/pref_taoSettings_id"
android:key="pref_taoSettings_key"
android:title="@string/pref_taoSettings_title" />
<SwitchPreference
android:defaultValue="false"
android:id="@+id/pref_playLevel_id"
android:key="pref_playLevel_key"
android:summary="Level"
android:summaryOff="@string/pref_playLevel_beginner"
android:summaryOn="@string/pref_playLevel_expert"
android:title="@string/pref_playLevel_title" />
</PreferenceScreen>
Note: now using android:key
當我重新編譯和運行應用程序，當我在菜單項上單擊，彈出我的設置畫面我下面的logcat輸出（級別調試）崩潰：
07-21 14:51:34.798 25317-25317/com.pcphoneconnections.threeandout W/art﹕ Before Android 4.1, method int android.support.v7.internal.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
07-21 14:51:36.957 25317-25317/com.pcphoneconnections.threeandout I/MainActivity::onOptionsItemSelected﹕ id == R.id.action_settings
07-21 14:51:36.985 25317-25317/com.pcphoneconnections.threeandout W/InputEventReceiver﹕ Attempted to finish an input event but the input event receiver has already been disposed.
07-21 14:51:37.081 25317-25317/com.pcphoneconnections.threeandout I/SettingsActivity﹕ onCreate(): Entry.
07-21 14:51:37.106 25317-25317/com.pcphoneconnections.threeandout I/SettingsActivity﹕ onCreatePreferenceFromFragment(): Entry.
07-21 14:51:37.111 25317-25317/com.pcphoneconnections.threeandout I/TaoPreferenceFragment﹕ onCreate(): Entry.
07-21 14:51:37.116 25317-25317/com.pcphoneconnections.threeandout D/AndroidRuntime﹕ Shutting down VM
07-21 14:51:37.118 25317-25317/com.pcphoneconnections.threeandout E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.pcphoneconnections.threeandout, PID: 25317
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.pcphoneconnections.threeandout/com.pcphoneconnections.threeandout.SettingsActivity}: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
at android.app.SharedPreferencesImpl.getBoolean(SharedPreferencesImpl.java:260)
at android.preference.Preference.getPersistedBoolean(Preference.java:1691)
at android.preference.TwoStatePreference.onSetInitialValue(TwoStatePreference.java:187)
at android.preference.Preference.dispatchSetInitialValue(Preference.java:1376)
at android.preference.Preference.onAttachedToHierarchy(Preference.java:1171)
at android.preference.PreferenceGroup.addPreference(PreferenceGroup.java:167)
at android.preference.PreferenceGroup.addItemFromInflater(PreferenceGroup.java:108)
at android.preference.PreferenceGroup.addItemFromInflater(PreferenceGroup.java:45)
at android.preference.GenericInflater.rInflate(GenericInflater.java:488)
at android.preference.GenericInflater.inflate(GenericInflater.java:326)
at android.preference.GenericInflater.inflate(GenericInflater.java:263)
at android.preference.PreferenceManager.inflateFromResource(PreferenceManager.java:272)
at android.preference.PreferenceFragment.addPreferencesFromResource(PreferenceFragment.java:299)
at com.pcphoneconnections.threeandout.SettingsActivity$TaoPreferenceFragment.onCreate(SettingsActivity.java:265)
at android.app.Fragment.performCreate(Fragment.java:2031)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:863)
at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1067)
at android.app.BackStackRecord.run(BackStackRecord.java:834)
at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1454)
at android.app.Activity.performStart(Activity.java:6025)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)
at android.app.ActivityThread.access$800(ActivityThread.java:155)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5356)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
07-21 14:51:39.324 25317-25317/com.pcphoneconnections.threeandout I/Process﹕ Sending signal. PID: 25317 SIG: 9
我運行的是Android 1.2.2工作室，用下面的應用程序設置。 gradle con外形：
應用插件： 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "21.1.2"
defaultConfig {
applicationId "com.pcphoneconnections.threeandout"
minSdkVersion 7
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
//*************************************************************************
// The following appears to identify the location of pre-built shared
// libraries, and disables automatic ndk-build call for jni source.
// Instructions found on several different sites for different NDK builds.
//*************************************************************************
sourceSets.main {
jniLibs.srcDir 'src/main/libs' // use the jni .so compiled from the manual ndk-build command
jni.srcDirs = [] //disable automatic ndk-build call
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
// repositories {
// maven {
// url "https://jitpack.io"
// }
// }
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.0.0'
}
最後，我有以下styles.xml配置：
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<!-- <item name="android:buttonStyle">@style/Button</item> -->
</style>
</resources>
如果有人知道如何解決我的死機問題，或者甚至可以確認這是一個問題，我想知道。我找不到任何信息，現在，我正在考慮轉移到複選框類型兩個狀態控件。我寧願使用開關控制。它看起來更好。
任何幫助非常感謝。
感謝，
鮑勃