Unable to start activity : java .lang.nullPointException
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错误产生原因：
从一个Activity跳转到另外一个Activity出错
错误如图所示：
在检查AndroidMainfest.xml配置清单后，Activity配置正确。
最后查找源代码，在第一个Activity中忘记在intent中putExtras，而在第二个Activity里getIntent().getExtras()必然拿不到东西，所以出空指针错。
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