设定的按钮在界面运行使用时出现错误

Question

其catlog中的代码：
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.os.Handler.sendMessage(android.os.Message)' on a null object reference
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at org.crazyit.multithreadclient.MainActivity.click(MainActivity.java:48)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.view.View$1.onClick(View.java:4002)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.view.View.performClick(View.java:4756)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.view.View$PerformClick.run(View.java:19749)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.os.Handler.handleCallback(Handler.java:739)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:95)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5221)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
05-11 03:07:40.315 15986-15986/org.crazyit.multithreadclient W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
这问题出在那里，怎么解决？
求大神指导。。。

Answer 1

你使用sendMessage方法时, 传入的Message 有没有new出来