unit testing - Android instrumentation.callActivityOnPause causes "System services not available to Activities before onCreate()" -


i'm setting unit test test camera app release camera handle when app goes background via onpause callback. gets part call onpause method of activity i'd get:

java.lang.illegalstateexception: system services not available activities before oncreate() @ android.app.activity.getsystemservice(activity.java:4738) @ android.app.activity.getmultiwindowstyle(activity.java:4563) @ android.app.activity.getmultiwindowstyle(activity.java:4568) @ android.app.activity.onpause(activity.java:1366) @ com.ricky.chow.cameraopencv.activity.maincameraactivity.onpause(maincameraactivity.java:57) @ android.app.activity.performpause(activity.java:5555) @ android.app.instrumentation.callactivityonpause(instrumentation.java:1239) @ com.ricky.chow.cameraopencv.activity.maincameraactivitytest.teardownthisactivity(maincameraactivitytest.java:58) @ com.ricky.chow.cameraopencv.activity.maincameraactivitytest.testcamerapreviewexists(maincameraactivitytest.java:78) @ java.lang.reflect.method.invokenative(native method) @ android.test.instrumentationtestcase.runmethod(instrumentationtestcase.java:214) @ android.test.instrumentationtestcase.runtest(instrumentationtestcase.java:199) @ android.test.androidtestrunner.runtest(androidtestrunner.java:191) @ android.test.androidtestrunner.runtest(androidtestrunner.java:176) @ android.test.instrumentationtestrunner.onstart(instrumentationtestrunner.java:554) @ android.app.instrumentation$instrumentationthread.run(instrumentation.java:1729)

unit test:

public class maincameraactivitytest extends activityunittestcase<maincameraactivity> {  private intent mlaunchintent; private imagebutton capturebutton; private framelayout camerapreviewview; private instrumentation minstrumentation; private maincameraactivity mactivity; public maincameraactivitytest(class<maincameraactivity> activityclass) {     super(activityclass); } public maincameraactivitytest() {     super(maincameraactivity.class); }   private void setupthisactivity() {     mlaunchintent = new intent(getinstrumentation().gettargetcontext(),             maincameraactivity.class);     minstrumentation = getinstrumentation();     mactivity = startactivity(mlaunchintent, null, null);      minstrumentation.callactivityonstart(mactivity);     minstrumentation.callactivityonresume(mactivity);     capturebutton = (imagebutton)mactivity.findviewbyid(r.id.capturebutton);     camerapreviewview = (framelayout)mactivity.findviewbyid(r.id.camerapreview); }  private void teardownthisactivity() {     minstrumentation.callactivityonpause(mactivity);     minstrumentation.callactivityonstop(mactivity); }  public void testcameraprieviewworks() {     setupthisactivity();     mediancamerapost mmediancam = (mediancamerapost) camerapreviewview.getchildat(0);     assert.assertnotnull(mmediancam);     assert.assertequals(mmediancam.getvisibility(), view.visible);     teardownthisactivity(); }

}


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