Unable to instantiate fragment make sure class nam-白红宇

Unable to instantiate fragment make sure class nam

阅读量：6212 次

发布时间：2019-06-21

本文共 4003 字，大约阅读时间需要 13 分钟。

今天突然遇到一个fragment的Bug，研究了好久~~ 还是google解决问题

E/UncaughtException-main(13661): Unable to start activity ComponentInfo{com.android.fileexplorer/com.android.fileexplorer.FileExplorerTabActivity}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.android.fileexplorer.view.FileViewFragment: make sure class name exists, is public, and has an empty constructor that is public

E/UncaughtException-main(13661): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.fileexplorer/com.android.fileexplorer.FileExplorerTabActivity}: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.android.fileexplorer.view.FileViewFragment: make sure class name exists, is public, and has an empty constructor that is public

E/UncaughtException-main(13661): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)

E/UncaughtException-main(13661): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)

E/UncaughtException-main(13661): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:3738)

E/UncaughtException-main(13661): at android.app.ActivityThread.access$900(ActivityThread.java:135)

E/UncaughtException-main(13661): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1202)

E/UncaughtException-main(13661): at android.os.Handler.dispatchMessage(Handler.java:102)

E/UncaughtException-main(13661): at android.os.Looper.loop(Looper.java:136)

E/UncaughtException-main(13661): at android.app.ActivityThread.main(ActivityThread.java:5017)

E/UncaughtException-main(13661): at java.lang.reflect.Method.invokeNative(Native Method)

E/UncaughtException-main(13661): at java.lang.reflect.Method.invoke(Method.java:515)

E/UncaughtException-main(13661): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)

E/UncaughtException-main(13661): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)

E/UncaughtException-main(13661): at dalvik.system.NativeStart.main(Native Method)

E/UncaughtException-main(13661): Caused by: android.app.Fragment$InstantiationException: Unable to instantiate fragment com.android.fileexplorer.view.FileViewFragment: make sure class name exists, is public, and has an empty constructor that is public

E/UncaughtException-main(13661): at android.app.Fragment.instantiate(Fragment.java:601)

E/UncaughtException-main(13661): at android.app.FragmentState.instantiate(Fragment.java:98)

E/UncaughtException-main(13661): at android.app.FragmentManagerImpl.restoreAllState(FragmentManager.java:1761)

E/UncaughtException-main(13661): at android.app.Activity.onCreate(Activity.java:899)

E/UncaughtException-main(13661): at miui.app.Activity.onCreate(Activity.java:48)

E/UncaughtException-main(13661): at com.android.fileexplorer.FileExplorerTabActivity.onCreate(FileExplorerTabActivity.java:39)

E/UncaughtException-main(13661): at android.app.Activity.performCreate(Activity.java:5231)

E/UncaughtException-main(13661): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)

E/UncaughtException-main(13661): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)

E/UncaughtException-main(13661): ... 12 more

E/UncaughtException-main(13661): Caused by: java.lang.InstantiationException: can't instantiate class com.android.fileexplorer.view.FileViewFragment; no empty constructor

E/UncaughtException-main(13661): at java.lang.Class.newInstanceImpl(Native Method)

E/UncaughtException-main(13661): at java.lang.Class.newInstance(Class.java:1208)

E/UncaughtException-main(13661): at android.app.Fragment.instantiate(Fragment.java:590)

E/UncaughtException-main(13661): ... 20 more

解决方法：自定义的fragment最好有一个Public的参数为空的构造函数，若需要传入一个参数，可以使用下面的方法

public FileViewFragment(){ }

public static FileViewFragment getInstance(A a){

FileViewFragment fileViewFragment = new FileViewFragment();

fileViewFragment.a = a;

return fileViewFragment;

}

转载于:https://my.oschina.net/tingzi/blog/222178

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