1、Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
(1)网上的解答: 在全局变量定义了TextView，然后在控件初始化时，又定义了
(2)我的问题
2、android.content.ActivityNotFoundException: Unable to find explicit activity class {com.myplayer.activity/com.myplayer.activity.MainActivity};
have you declared this activity in your AndroidManifest.xml?
清单文件配置错误
标签：myplayer,app,报错,activity,android,com From： https://www.cnblogs.com/fan-wang/p/17189498.html