多線程空指針異常 Exception in thread "AsyncTask2" Exception in thread "AsyncTask1" java.lang.NullPointerExce
寫了一個多線程方法，調用一個單線程不報錯的方法，一直在拋Exception in thread "AsyncTask2" Exception in thread "AsyncTask1" java.lang.NullPointerException 後來在調用外面套了try catch解決
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