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  • bug_ _ _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。

            其中一次报错,根据报错提示 “make sure class name exists, is public, and has an empty constructor that is public” ,若Fragement定义有带参构造函数,则一定要定义public的默认的构造函数。即可解决此问题。如果硬要携带参数进去,可以通过Intent结合Bunble的方式携带进去。

            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

            解决办法:

            在对应模块的proguard.flags文件中引入该Fragment所在的类包即可。比如: -keep class com.android.settings.wifi.*Settings

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  • 原文地址:https://www.cnblogs.com/awkflf11/p/4613448.html
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