view findviewbyid
findViewById always requires a context to find the view. If you are calling this from a class which is extends the Activity class, you could just use ..., Check out your R.id.main_txt_name is in your R.layout.fragment_main xml. May be your id is not layout xml.,The View version searches the view you call it on and all subviews of it. The Activity one searches the top level view set in setContentView and all subviews of it. , Your problem is here: ViewPager viewpager = (ViewPager) mView.findViewById(R.id.viewpager);. There is no "viewpager" in this layout., 所以，如果在Activity中调用findViewById(int id)的时候，要注意id的来源，如果id不是在当前Activity所在的窗口，拿到的view对象就为空，比如：., 一般我们在oncreate()方法中使用的(**view)findViewById(R.id.**)既是调用的Activity中的findViewById()函数. 而在其他情况写出的***view.,Button myButton = findViewById(R.id.my_button);. View IDs need not be unique throughout the tree, but it is good practice to ensure that they are at least unique ... , 从Android Support Library 26.0.0 Beta 1 开始findViewById 将不再需要 ... 需要注意的是重构布局时，如果id 对应的View 类型发生了变化而又忘记 ...,Jollen 的Android 教學,#6: WebView 體驗與findViewByID. jollen 發表於January 5, 2009 11:08 PM. 如果要繼續體驗View 的樂趣，那麼「WebView」這個View 無疑是 ...
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 view findviewbyid 相關參考資料
android - Difference between view.findViewById(R.id....) and just ...
findViewById always requires a context to find the view. If you are calling this from a class which is extends the Activity class, you could just use ... https://stackoverflow.com java - Android view.findViewById(R.id....) nullpointer exception ...
Check out your R.id.main_txt_name is in your R.layout.fragment_main xml. May be your id is not layout xml. https://stackoverflow.com what is the difference between View.findViewById() and Activity ...
The View version searches the view you call it on and all subviews of it. The Activity one searches the top level view set in setContentView and all subviews of it. https://stackoverflow.com android - view.findViewById() returns null - Stack Overflow
Your problem is here: ViewPager viewpager = (ViewPager) mView.findViewById(R.id.viewpager);. There is no "viewpager" in this layout. https://stackoverflow.com view.findViewById 和Activity.findViewById区别- 一个冬季的专栏 ...
所以，如果在Activity中调用findViewById(int id)的时候，要注意id的来源，如果id不是在当前Activity所在的窗口，拿到的view对象就为空，比如：. https://blog.csdn.net Activity的findViewById()和View的findViewById() - 大鱼- CSDN博客
一般我们在oncreate()方法中使用的(**view)findViewById(R.id.**)既是调用的Activity中的findViewById()函数. 而在其他情况写出的***view. https://blog.csdn.net View | Android Developers
Button myButton = findViewById(R.id.my_button);. View IDs need not be unique throughout the tree, but it is good practice to ensure that they are at least unique ... https://developer.android.com Java 与Kotlin 中各种findViewById 的方式| DemoJameson's Blog
从Android Support Library 26.0.0 Beta 1 开始findViewById 将不再需要 ... 需要注意的是重构布局时，如果id 对应的View 类型发生了变化而又忘记 ... http://www.demojameson.com Jollen 的Android 教學,#6: WebView 體驗與findViewByID
Jollen 的Android 教學,#6: WebView 體驗與findViewByID. jollen 發表於January 5, 2009 11:08 PM. 如果要繼續體驗View 的樂趣，那麼「WebView」這個View 無疑是 ... http://www.jollen.org |