Android开发中Unable to instantiate activity ComponentInfo java.lang.NullPointerException解决方案

错误信息：E/AndroidRuntime(596): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{cn.edu.buaa/skylz.mp3player.PlayerActivity}: java.lang.NullPointerException 出现这个错误我是一遍一遍看代码，而且用排除法排

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