Android开发中java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx}
2017-09-13 11:21
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Android开发中java.lang.RuntimeException: Unable to start activity ComponentInfo{xxx}: java.lang.NullPoi
错误信息字符串:java.lang.RuntimeException: Unable to start activity ComponentInfo{com.first/com.first.Game}: java.lang.NullPointerException一般都会在Activity onCreate()方法里的setContentView(XXX)发生此错误,网上查阅了很多原因,大概有四种重要可能的原因:
原因一:xxx的错误,若为R.layout.main 那么应该是main.xml文件中的标签 使用错误,最常见的而且编译器不会提示的错误就是 android:name 和 android:id两者混淆,仔细检查main.xml的标签是否全部正确
原因二:在setContentView(view)方法之后使用了requestWindowFeature()方法,并且在此错误下面会提示requestFeature必须在setContentView之前使用,只需要把requestWindowFeature()方法放在setContentView(view)方法之前就可以解决
原因三:在onCreate()方法之外,并且不属于任何一个方法体内直接给某控件findById(R.id.xx)所导致,需要在某方法内并且在setContentView(view)方法之前进行findById(R.id.xx)即可解决
原因四:在setContentView(view)之前没有对view进行实例化,只进行了声明而直接 setContentView(view) 所导致,仔细检查view是否setContentView(view)调用之前并在方法内进行实例化即可解决
原因五:因为发生了空指针的错误异常,所以你应该检查一下比如 Spinner 或者 list 这类的东西里面是否有值存在;
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