Attempt to invoke interface method 'boolean java.util.List.add(java.lang.Object)' on a null object reference 尝试在一个空的对象引用上引用boolean java.util.List.add()这个方法; 错误例子: privateArrayList<String>classList; classList.
1.Android Studio报错 Attempt to invoke interface method 'boolean java.util.List.add(java.lang.Object)' on a null 原因:List没有初始化,比如 List<>list; 没有 List<>list = new ArrayList<>();
Request threw uncaught throwable java.lang.NullPointerException: Attempt to invoke interface method 'void java.util.List.clear()' on a null object reference at com.bumptech.glide.util.pool.FactoryPools$3.reset(FactoryPools.java:86) at com.bumptech.glide.util.pool.FactoryPools$3.reset(FactoryPools...
Fatal Exception: java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference at com.google.android.gms.internal.zzblq.zzc(Unknown Source) at com.google.android.gms.internal.zzblq.z...
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException java.lang.NullPointerException: Attempt to invoke interface method 'java.util.Iterator java.util.List.iterator()' on a null object reference 0 = {StackTraceElement@11813} "java.lang.reflect.Method.invoke(Native Method)" 1 = ...
java.lang.RuntimeException: Unable to start activity ComponentInfo{cn.zkhw.client/cn.zkhw.client.BottomNavigationActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void .ActionBar.setTitle(java.lang.CharSequence)' on a null object reference ...
java.lang.NullPointerException: attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.String)' on a null object reference 这表示你在尝试调用一个TextView对象的setText方法时,该对象为null。 基础概念 NullPointerException:当应用程序试图在需要对象的地方...
下面是解决 “tbs报错 java.lang.NullPointerException: Attempt to invoke virtual method” 的一个示例: publicclassExample{publicstaticvoidmain(String[]args){Stringtext=null;// 声明一个空字符串对象// 调用空字符串对象的方法intlength=text.length();// 这里会引发空指针异常System.out.println(length);}...
针对用户问题中提到的“caused by: java.lang.nullpointerexception: attempt to invoke virtual method”,具体解决方案将取决于具体的代码上下文。但一般来说,可以遵循以下步骤进行调试: 查看堆栈跟踪:首先,仔细查看异常堆栈跟踪中提供的行号,定位到抛出NullPointerException的具体代码位置。 检查对象引用:在抛出异常的方法...
mainProcess:com.lwp.justtest,PID:17152java.lang.RuntimeException:Unable to instantiate activity ComponentInfo{com.lwp.justtest/com.lwp.justtest.next}:java.lang.NullPointerException:Attempt to invoke virtual method'int android.content.Intent.getIntExtra(java.lang.String, int)'on anullobject reference...