Java 确定上下文是否是特定活动
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Determine if context is a Specific Activity
提问by Memento
I'm passing the Activity context to a dialog but that dialog is global to other Activities, so its possible that other activities create that dialog too. My question is how can I determine that Activity context is a specific Activity?
我将 Activity 上下文传递给一个对话框，但该对话框对于其他 Activity 是全局的，因此其他活动也可能创建该对话框。我的问题是如何确定 Activity 上下文是特定的 Activity？
I'm passing ActivityContext like this :
我像这样传递 ActivityContext ：
private Activity ActivityContext;
public MessageDialog(Activity context,int DialogStyle,int Dialog_Layout,String Msg)
{
super(context,DialogStyle,Dialog_Layout);
this.ActivityContext = context;
this.Msg = Msg;
}
采纳答案by marcinj
You can use instanceof:
您可以使用 instanceof：
if ( this.ActivityContext instanceof MyActivity ) {
/// ....
}
回答by surga
I know the question is in java but if you are looking the answer in the kotlin :
我知道问题出在 Java 中，但如果您正在 kotlin 中寻找答案：
if (this.activity is AppActivity) {
// ...
}
回答by Biplob Das
override fun onAttach(context: Context) {
super.onAttach(context)
if (context is MyInterFace) {
interfaceVariable = context as MyInterFace
}
}
