android.app.Fragment$InstantiationException 解决办法

原创

doloveme 2023-04-18 06:04:18 博主文章分类：Android ©著作权

文章标签 移动开发 java android 构造函数 文章分类 jQuery 前端开发

©著作权归作者所有：来自51CTO博客作者doloveme的原创作品，请联系作者获取转载授权，否则将追究法律责任

android.app.Fragment$InstantiationException 解决办法

在实际的开发中，我遇到过两次android.app.Fragment$InstantiationException报错。

“make sure class name exists, is public, and has an empty constructor that is public”

第二次报错如下贴的log信息，在“is public, and has an empty constructor that is public” 都满足的情况下，编译ENG版本运行没有任何问题，但是编译USER版本就会出现CRASH错误。原因在于USER版本编译时会代码混淆。

E/AndroidRuntime( 3253): FATAL EXCEPTION: main

E/AndroidRuntime( 3253): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.settings/com.android.settings.SubSettings}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.android.settings.mcwill.McWiLLSettings: make sure class name exists, is public, and has an empty constructor that is public

E/AndroidRuntime( 3253):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1964)
E/AndroidRuntime( 3253):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1989)
E/AndroidRuntime( 3253):    at android.app.ActivityThread.access$600(ActivityThread.java:126)
E/AndroidRuntime( 3253):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1155)
E/AndroidRuntime( 3253):    at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime( 3253):    at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 3253):    at android.app.ActivityThread.main(ActivityThread.java:4482)
E/AndroidRuntime( 3253):    at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 3253):    at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime( 3253):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
E/AndroidRuntime( 3253):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
E/AndroidRuntime( 3253):    at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime( 3253): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.android.settings.mcwill.McWiLLSettings: make sure class name exists, is public, and has an empty constructor that is public
E/AndroidRuntime( 3253):    at android.app.Fragment.instantiate(Fragment.java:581)
E/AndroidRuntime( 3253):    at android.preference.PreferenceActivity.switchToHeaderInner(PreferenceActivity.java:1120)
E/AndroidRuntime( 3253):    at android.preference.PreferenceActivity.switchToHeader(PreferenceActivity.java:1136)
E/AndroidRuntime( 3253):    at android.preference.PreferenceActivity.onCreate(PreferenceActivity.java:532)
E/AndroidRuntime( 3253):    at com.android.settings.Settings.onCreate(Settings.java:99)
E/AndroidRuntime( 3253):    at android.app.Activity.performCreate(Activity.java:4465)
E/AndroidRuntime( 3253):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
E/AndroidRuntime( 3253):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1928)
E/AndroidRuntime( 3253):    ... 11 more
E/AndroidRuntime( 3253): Caused by: java.lang.ClassNotFoundException: com.android.settings.mcwill.McWiLLSettings
E/AndroidRuntime( 3253):    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:61)
E/AndroidRuntime( 3253):    at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
E/AndroidRuntime( 3253):    at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
E/AndroidRuntime( 3253):    at android.app.Fragment.instantiate(Fragment.java:571)
E/AndroidRuntime( 3253):    ... 18 more
W/ActivityManager( 422):   Force finishing activity com.android.settings/.SubSettings
W/ActivityManager( 422):   Force finishing activity com.android.settings/.Settings