1：问题

2019-01-21 10:19:28.255 15997-15997/com.example.zhang E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.zhang, PID: 15997
    java.lang.NoClassDefFoundError: Failed resolution of: Lcom/android/tools/profiler/support/ProfilerService;
        at com.example.zhang.app.AppApplication.<init>(AppApplication.java:20)
        at java.lang.Class.newInstance(Native Method)
        at android.app.Instrumentation.newApplication(Instrumentation.java:1010)
        at android.app.Instrumentation.newApplication(Instrumentation.java:995)
        at android.app.LoadedApk.makeApplication(LoadedApk.java:849)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5632)
        at android.app.ActivityThread.-wrap2(ActivityThread.java)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:156)
        at android.app.ActivityThread.main(ActivityThread.java:6523)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.android.tools.profiler.support.ProfilerService" on path: DexPathList[[zip file "/data/app/com.example.zhang-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.zhang-1/lib/arm, /data/app/com.example.zhang-1/base.apk!/lib/armeabi, /system/lib, /vendor/lib, /system/vendor/lib, /product/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at com.example.zhang.app.AppApplication.<init>(AppApplication.java:20) 
        at java.lang.Class.newInstance(Native Method) 
        at android.app.Instrumentation.newApplication(Instrumentation.java:1010) 
        at android.app.Instrumentation.newApplication(Instrumentation.java:995) 
        at android.app.LoadedApk.makeApplication(LoadedApk.java:849) 
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5632) 
        at android.app.ActivityThread.-wrap2(ActivityThread.java) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1637) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:156) 
        at android.app.ActivityThread.main(ActivityThread.java:6523) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:942) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:832) 

2、解决方法

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