混淆产生的问题

06-18 09:08:58.454  4362  4362 D AndroidRuntime: Shutting down VM
06-18 09:08:58.456  4362  4362 E AndroidRuntime: FATAL EXCEPTION: main
06-18 09:08:58.456  4362  4362 E AndroidRuntime: Process: acr.browser.lightning, PID: 4362
06-18 09:08:58.456  4362  4362 E AndroidRuntime: androidx.fragment.app.f0: Unable to instantiate fragment acr.browser.lightning.settings.fragment.PrivacySettingsFragment: make sure class name exists
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at androidx.fragment.app.r0.d(SourceFile:30)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at androidx.fragment.app.c1.a(SourceFile:28)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at acr.browser.lightning.settings.activity.SettingsActivity.f(Unknown Source:32)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at androidx.preference.Preference.P(SourceFile:92)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at androidx.preference.o.onClick(Unknown Source:2)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.view.View.performClick(View.java:7455)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.view.View.performClickInternal(View.java:7432)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.view.View.access$3700(View.java:835)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.view.View$PerformClick.run(View.java:28810)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.os.Handler.handleCallback(Handler.java:938)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.os.Handler.dispatchMessage(Handler.java:99)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.os.Looper.loopOnce(Looper.java:201)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.os.Looper.loop(Looper.java:288)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at android.app.ActivityThread.main(ActivityThread.java:7870)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at java.lang.reflect.Method.invoke(Native Method)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)06-18 09:08:58.456  4362  4362 E AndroidRuntime: Caused by: java.lang.ClassNotFoundException: acr.browser.lightning.settings.fragment.PrivacySettingsFragment
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at java.lang.Class.classForName(Native Method)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at java.lang.Class.forName(Class.java:454)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at androidx.fragment.app.r0.c(SourceFile:29)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        at androidx.fragment.app.r0.d(SourceFile:3)
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        ... 16 more
06-18 09:08:58.456  4362  4362 E AndroidRuntime: Caused by: java.lang.ClassNotFoundException: acr.browser.lightning.settings.fragment.PrivacySettingsFragment
06-18 09:08:58.456  4362  4362 E AndroidRuntime:        ... 20 more

解决方法：

在 proguard-project.txt添加对应的规则取消对Fragment的混淆

-keep public class * extends androidx.preference.PreferenceFragmentCompat