我正在尝试让这段代码工作:TestingGPSinAndroid问题是，当我运行测试时，永远不会调用onLocationChanged():publicclassLocationTest0extendsAndroidTestCaseimplementsLocationListener{privateLocationreceived=null;publicvoidtestExample(){LocationManagerlm=(LocationManager)this.getContext().getSystemService(Context.LOCATION_SERVICE);Stri