Android 如何在 Fragment 中访问父活动视图
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How to access parent Activity View in Fragment
提问by Bot
I have an ActionBarActivityand fragment. I am using FragmentPagerAdapterthat provides fragment to my app. My question How can I access parent Activity View in Fragment ??
我有一个ActionBarActivity和片段。我正在使用FragmentPagerAdapter它为我的应用程序提供片段。我的问题如何在 Fragment 中访问父活动视图？
回答by Raghunandan
You can use
您可以使用
View view = getActivity().findViewById(R.id.viewid);
Quoting docs
引用文档
Specifically, the fragment can access the Activity instance with getActivity() and easily perform tasks such as find a view in the activity layout
具体来说，fragment 可以通过 getActivity() 访问 Activity 实例，并轻松执行诸如在 Activity 布局中查找视图等任务
回答by Mohsen mokhtari
At first, create a view like this:
首先，创建一个这样的视图：
View view = getActivity().findViewById(R.id.viewid);
Then convert it to any view that you need like this:
然后将其转换为您需要的任何视图，如下所示：
if( view instanceof EditText ) {
editText = (EditText) view;
editText.setText("edittext");
//Do your stuff
}
or
或者
if( view instanceof TextView ) {
TextView textView = (TextView) view;
//Do your stuff
}
回答by kishan verma
In Kotlin it is very easy to access parent Activity View in Fragment
在 Kotlin 中，很容易在 Fragment 中访问父活动视图
activity!!.textview.setText("String")
回答by Irfandi D. Vendy
Note that if you are using findViewById<>() from activity, it wont work if you call it from fragment. You need to assign the view to variable. Here is my case
请注意，如果您从活动中使用 findViewById<>() ，如果您从片段中调用它，它将无法工作。您需要将视图分配给变量。这是我的情况
This doesn't work
这不起作用
class MainActivity{
fun onCreate(...){
//works
setMyText("Set from mainActivity")
}
fun setMyText(s: String){
findViewById<TextView>(R.id.myText).text = s
}
}
________________________________________________________________
class ProfileFragment{
...
fun fetchData(){
// doesn't work
(activity as MainActivity).setMyText("Set from profileFragment")
}
}
This works
这有效
class MainActivity{
private lateinit var myText: TextView
fun onCreate(...){
myText = findViewById(R.id.myText)
// works
setMyText("Set from mainActivity")
}
fun setMyText(s: String){
myText.text = s
}
}
________________________________________________________________
class ProfileFragment{
...
fun fetchData(){
// works
(activity as MainActivity).setMyText("Set from profileFragment")
}
}
