发现一个崩溃问题，空指针异常。

[ho2xing]

04-21 16:44:09.566 8417-8417/ E/AndroidRuntime: FATAL EXCEPTION: main

java.lang.NullPointerException at com.cjj.MaterialRefreshLayout.setProgressValue(MaterialRefreshLayout.java:393) at com.cjj.MaterialRefreshLayout.finishRefreshing(MaterialRefreshLayout.java:484) at com.cjj.MaterialRefreshLayout$2.run(MaterialRefreshLayout.java:492) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5072) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:515) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:609) at dalvik.system.NativeStart.main(Native Method)