Attempt to invoke interface method 'void com.ryg.dynamicload.DLPlugin.onWindowAttributesChanged(android.view.WindowManager$LayoutParams)' on a null object reference

[zhenchong]

遇到如下crash请指教，注释掉DLProxyActivity中的onWindowAttributesChanged方法就正常了，有人知道这是为啥吗？
E/AndroidRuntime( 5315): Process: com.ryg.dynamicload.sample.mainhost, PID: 5315
10-12 14:30:42.408 E/AndroidRuntime( 5315): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ryg.dynamicload.sample.mainhost/com.ryg.dynamicload.DLProxyActivity}: java.lang.NullPointerException: Attempt to invoke interface method 'void com.ryg.dynamicload.DLPlugin.onWindowAttributesChanged(android.view.WindowManager$LayoutParams)' on a null object reference
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2815)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2893)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.ActivityThread.-wrap11(Unknown Source:0)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.os.Handler.dispatchMessage(Handler.java:106)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.os.Looper.loop(Looper.java:164)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.ActivityThread.main(ActivityThread.java:6650)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at java.lang.reflect.Method.invoke(Native Method)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:818)
10-12 14:30:42.408 E/AndroidRuntime( 5315): Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'void com.ryg.dynamicload.DLPlugin.onWindowAttributesChanged(android.view.WindowManager$LayoutParams)' on a null object reference
10-12 14:30:42.408 E/AndroidRuntime( 5315): at com.ryg.dynamicload.DLProxyActivity.onWindowAttributesChanged(DLProxyActivity.java:155)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.view.Window.dispatchWindowAttributesChanged(Window.java:1147)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at com.android.internal.policy.PhoneWindow.dispatchWindowAttributesChanged(PhoneWindow.java:2973)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.view.Window.setColorMode(Window.java:1168)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.Activity.attach(Activity.java:7080)
10-12 14:30:42.408 E/AndroidRuntime( 5315): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2748)
10-12 14:30:42.408 E/AndroidRuntime( 5315): ... 9 more
10-12 14:30:42.413 W/ActivityManager( 1347): Force finishing activity com.ryg.dynamicload.sample.mainhost/com.ryg.dynamicload.DLProxyActivity
10-12 14:30:42.416 W/ActivityManager( 1347): Force finishing activity com.ryg.dynamicload.sample.mainhost/.MainActivity
10-12 14:30:42.421 W/ContextImpl( 1347): Calling a method in the system process without a qualified user: android.app.ContextImpl.bindService:1566 android.content.ContextWrapper.bindService:694 miui.os.DropBoxManager.Bl:361 miui.os.DropBoxManager.Bk:350 miui.os.DropBoxManager.addText:314

[yxwandroid]

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