01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: Caused by: java.lang.NullPointerException
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at com.gps.yyq.gpsyyq.MainActivity.onCreate(MainActivity.java:20)
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at android.app.Activity.performCreate(Activity.java:5377)
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1104)
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2270)
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2362)
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at android.app.ActivityThread.access$700(ActivityThread.java:168)
01-11 10:22:50.631 28150-28150/? E/AndroidRuntime: at android.app.ActivityT