使用 UiAutomation 出现 UiAutomation connect 失败的问题，请问有哪位大神遇到过的吗
mInstrumentation = InstrumentationRegistry.getInstrumentation();
mDevice = UiDevice.getInstance(mInstrumentation);
报错：
AndroidRuntime: FATAL EXCEPTION: Instr: android.support.test.runner.AndroidJUnitRunner
Process: com.xgd.mytest, PID: 22079
java.lang.IllegalStateException: Cannot call disconnect() while connecting UiAutomation@40bc56a[id=-1, flags=0]
at android.app.UiAutomation.disconnect(UiAutomation.java:293)
at android.app.Instrumentation.finish(Instrumentation.java:249)
at android.support.test.runner.MonitoringInstrumentation.finish(MonitoringInstrumentation.java:351)
at android.support.test.runner.AndroidJUnitRunner.finish(AndroidJUnitRunner.java:404)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:393)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:2205)