多线程空指针异常 Exception in thread "AsyncTask2" Exception in thread "AsyncTask1" java.lang.NullPointerExce
写了一个多线程方法，调用一个单线程不报错的方法，一直在抛Exception in thread "AsyncTask2" Exception in thread "AsyncTask1" java.lang.NullPointerException 后来在调用外面套了try catch解决
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