? Process: com.weather.com.welcomeactivity, PID: 8304? ? java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.SharedPreferences android.content.Context.getSharedPreferences(java.lang.String, int)' on a null object reference?at com.weather.com.welcomeactivity.utils.CacheUtils.getString(CacheUtils.java:46)?at com.weather.com.welcomeactivity.shoppingcart.utils.CartProvider.getDataFromLocal(CartProvider.java:73)? at com.weather.com.welcomeactivity.shoppingcart.utils.CartProvider.getAllData(CartProvider.java:66)? ?at com.weather.com.welcomeactivity.shoppingcart.utils.CartProvider.listToSparse(CartProvider.java:44)? ? at com.weather.com.welcomeactivity.shoppingcart.utils.CartProvider.<init>(CartProvider.java:32)? ? at com.weather.com.welcomeactivity.shoppingcart.utils.CartProvider.getInstance(CartProvider.java:38)? ? at com.weather.com.welcomeactivity.app.GoodsInfoActivity.onClick(GoodsInfoActivity.java:163)? ? at android.view.View.performClick(View.java:5637)? ? at android.view.View$PerformClick.run(View.java:22429)? ? at android.os.Handler.handleCallback(Handler.java:751)? ? at android.os.Handler.dispatchMessage(Handler.java:95)? ? at android.os.Looper.loop(Looper.java:154)? ? at android.app.ActivityThread.main(ActivityThread.java:6119)? ? at java.lang.reflect.Method.invoke(Native Method)? ? at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)? ? at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?