android - Proguard：ArrayAdapter.createViewFromResource中的NullPointerException，而我在t中没有任何类

我的应用程序启动没有任何问题。但是，当我登录并且下一个活动即将开始时，应用程序崩溃并显示以下异常：

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
    at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:453)
    at android.widget.ArrayAdapter.getView(ArrayAdapter.java:415)
    at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:204)
    at android.widget.Spinner.onMeasure(Spinner.java:602)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1535)
    at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1187)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:706)
    at android.view.View.measure(View.java:23169)
    at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1168)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:706)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1535)
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:825)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:704)
    at android.view.View.measure(View.java:23169)
    at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
    at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1535)
    at android.widget.LinearLayout.measureVertical(LinearLayout.java:825)
    at android.widget.LinearLayout.onMeasure(LinearLayout.java:704)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
    at com.android.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:461)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6749)
    at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
    at com.android.internal.policy.DecorView.onMeasure(DecorView.java:716)
    at android.view.View.measure(View.java:23169)
    at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2718)
    at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1572)
    at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1855)
    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)

令我惊讶的是，我的课程或外部库都没有出现。如果我保留整个程序包，则下一个活动将成功启动。但是然后我也不需要使用混淆处理。这也很奇怪：如果我保留我的整个包裹，它就可以正常工作。但是，如果我保留两个子包（package.name.technical和package.name.functional），它将无法正常工作。

我保留了很多在互联网上发现的View内容。例如：

-keep class android.widget.AutoCompleteTextView {*;}
-keep class android.widget.Spinner {*;}
-keep class android.widget.ArrayAdapter {*;}
-keep public class * extends android.widget.AdapterView {*;}
-keep public class * extends android.widget.Adapter {*;}
-keep public class * extends android.widget.BaseAdapter {*;}
-keep public class * extends android.view.View {
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);
}

我还保留了应该开始的活动。

在build.gradle中未启用“ shrinkResources”。

有谁知道为什么吗？我真的很绝望，不知道该怎么办。