问题描述
正如标题所说，babel 2021-07-29 09:33:53.322 1710-1901/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2021-07-29 09:33:53.648 1710-2329/? E/SurfaceFlinger: ro.sf.lcd_density must be defined as a build property
2021-07-29 09:33:53.661 726-759/? E/eglCodecCommon: GoldfishAddressspaceHostMemoryAllocator: ioctl_ping Failed for device_type=5,ret=-1
2021-07-29 09:33:54.248 1816-1816/? E/netmgr: Failed to open QEMU pipe 'qemud:network': Invalid argument
2021-07-29 09:33:54.248 1816-1816/? E/netmgr: WifiForwarder unable to open QEMU pipe: Invalid argument
2021-07-29 09:33:56.433 16443-16456/? E/memtrack: Couldn't load memtrack module
2021-07-29 09:33:58.245 636-636/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.wuad,PID: 636
java.lang.NullPointerException: Attempt to invoke virtual method 'void androidx.fragment.app.Fragment.setinitialSavedState(androidx.fragment.app.Fragment$SavedState)' on a null object reference
at androidx.viewpager2.adapter.FragmentStateAdapter.ensureFragment(FragmentStateAdapter.java:269)
at androidx.viewpager2.adapter.FragmentStateAdapter.onBindViewHolder(FragmentStateAdapter.java:175)
at androidx.viewpager2.adapter.FragmentStateAdapter.onBindViewHolder(FragmentStateAdapter.java:67)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6118)
at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:6114)
at androidx.recyclerview.widget.linearlayoutmanager$LayoutState.next(linearlayoutmanager.java:2303)
at androidx.recyclerview.widget.linearlayoutmanager.layoutChunk(linearlayoutmanager.java:1627)
at androidx.recyclerview.widget.linearlayoutmanager.fill(linearlayoutmanager.java:1587)
at androidx.recyclerview.widget.linearlayoutmanager.onLayoutChildren(linearlayoutmanager.java:665)
at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:4134)
at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3851)
at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4404)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at androidx.viewpager2.widget.ViewPager2.onLayout(ViewPager2.java:527)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at androidx.drawerlayout.widget.DrawerLayout.onLayout(DrawerLayout.java:1231)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:753)
at android.view.View.layout(View.java:20672)
at android.view.ViewGroup.layout(ViewGroup.java:6194)
at android.view.ViewRootImpl.performlayout(ViewRootImpl.java:2792)
2021-07-29 09:33:58.245 636-636/? E/AndroidRuntime: at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2319)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1460)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7183)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)
at android.view.Choreographer.doCallbacks(Choreographer.java:761)
at android.view.Choreographer.doFrame(Choreographer.java:696)
at android.view.Choreographer$FramedisplayEventReceiver.run(Choreographer.java:935)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6669)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
不起作用。
这是--out-file-extension：
package.json当我运行 {
"name": "Assets","version": "1.0.0","description": "","main": "index.js","scripts": {
"test": "echo \"Error: no test specified\" && exit 1","babel:dev": "babel --presets es2015 Scripts/src -d Scripts/js","babel:min": "babel --presets minify Scripts/src -d Scripts/js --out-file-extension .min.js"
},"keywords": [],"author": "","license": "ISC","devDependencies": {
"babel-cli": "^6.26.0","babel-core": "^6.26.3","babel-preset-es2015": "^6.24.1","babel-preset-minify": "^0.5.1"
}
}
时，结果是：npm run babel:dev
但是当我运行 Scripts\src\main.js -> Scripts\js\main.js 时会发生同样的结果，输出文件被缩小但扩展名不会改变。
那么我在这里做错了什么？