android - 在活动中是正确的从自定义侦听器获取位置(android - in actvity is correct get position from custom listener)

 在我的应用程序中，我有一个自定义侦听器的列表视图。 
 
 我想在我的活动中使用onSaveInstanceState和onRestoreInstanceState，但我需要的唯一信息是在我的类CustomListener中的方法OnItemClick中。 
 
 我需要参数“position”的值，它是4个onItemClick参数中的一个，因为是唯一能够知道列表中单击项目的位置的唯一方法。 在onSaveInstanceState和onRestoreInstanceState两个方法中，我需要知道正确恢复活动的状态。 
 
 我的问题是两个：1 - 是正确的（最好的做法）创建方法获取和设置在CustomListener中，并在Activity中使用它们，onSaveInstanceState和onRestoreInstanceState两个方法（我认为这不是正确的方式做到这一点，但我不没有其他的想法）2 - 一旦我有参数位置，我有问题在CustomListener的方法OnItemClick中设置此参数，因为如果我在纵向模式，并且我传递到横向模式，系统不会调用OnItemClick和所以方法内部的参数不会被修改，并且景观布局也不会被修改。 
 
 这个方法在MainActivity中： 
 
private void populate(ListView lv){

    ImageAdapter arrayAdapter;

    //set list view
    arrayAdapter = new ImageAdapter(this, R.layout.list_view_layout, arrayFromNumberToId, hmFromIdToName);
    lv.setAdapter(arrayAdapter);

    //set list listener
    listener=new CustomListener(hm, hmFromIdToName, arrayFromNumberToId);
    lv.setOnItemClickListener(listener);

}
 
 此方法在类CustomListener中： 
 
    @Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    int imageID;
    String description;
    String name;



    imageID = arrayFromNumberToId[position];
    description = hm.get(imageID);
    name = hmIdToName.get(arrayFromNumberToId[position]);

    extras = new Bundle();
    extras.putInt("imageID", imageID);
    extras.putCharSequence("description", description);
    extras.putCharSequence("name", name);

    if(parent.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {

        Intent intent = new Intent(parent.getContext(), DescriptionActivity.class);

        intent.putExtras(extras);

        parent.getContext().startActivity(intent);
    }
    else{
        ImageView imageViewLayout;
        TextView textView;


        textView = (TextView) parent.getRootView().findViewById(R.id.textDescription);
        textView.setText(description);

        imageViewLayout = (ImageView) parent.getRootView().findViewById(R.id.imageBig);
        imageViewLayout.setImageResource(imageID);

        textView = (TextView) parent.getRootView().findViewById(R.id.textName);
        textView.setText(name);
        textView.setTypeface(null, Typeface.BOLD);
    }
}
 
 感谢您的回答！ 

In my app i have a listview with a custom listener.
 
I would like to use onSaveInstanceState and onRestoreInstanceState in my activity, but the only information that i need is in method OnItemClick inside my class CustomListener.
 
I need the value of parameter "position", one of 4 onItemClick's parameters, because is the only way to know in what position of list was clicked item. And in the two mthods onSaveInstanceState and onRestoreInstanceState i need to know to restore correctly the activity's state.
 
My questions are two: 1 - is correct(is best practise) create methods get and set in CustomListener and use them in Activity, where are the two methods onSaveInstanceState and onRestoreInstanceState (I think is not the right way to do this, but I don't have others ideas) 2 - once i have the parameter position, i have the problem to set this parameter inside CustomListener's method OnItemClick, because if i am in portrait mode and i pass to landscape mode, the system doesn't call OnItemClick and so the parameter inside the method will not modify, and also the landscape layout won't be modify.
 
this method is in MainActivity:
 
private void populate(ListView lv){

    ImageAdapter arrayAdapter;

    //set list view
    arrayAdapter = new ImageAdapter(this, R.layout.list_view_layout, arrayFromNumberToId, hmFromIdToName);
    lv.setAdapter(arrayAdapter);

    //set list listener
    listener=new CustomListener(hm, hmFromIdToName, arrayFromNumberToId);
    lv.setOnItemClickListener(listener);

}
 
This method is in class CustomListener:
 
    @Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

    int imageID;
    String description;
    String name;



    imageID = arrayFromNumberToId[position];
    description = hm.get(imageID);
    name = hmIdToName.get(arrayFromNumberToId[position]);

    extras = new Bundle();
    extras.putInt("imageID", imageID);
    extras.putCharSequence("description", description);
    extras.putCharSequence("name", name);

    if(parent.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) {

        Intent intent = new Intent(parent.getContext(), DescriptionActivity.class);

        intent.putExtras(extras);

        parent.getContext().startActivity(intent);
    }
    else{
        ImageView imageViewLayout;
        TextView textView;


        textView = (TextView) parent.getRootView().findViewById(R.id.textDescription);
        textView.setText(description);

        imageViewLayout = (ImageView) parent.getRootView().findViewById(R.id.imageBig);
        imageViewLayout.setImageResource(imageID);

        textView = (TextView) parent.getRootView().findViewById(R.id.textName);
        textView.setText(name);
        textView.setTypeface(null, Typeface.BOLD);
    }
}
 
THANKS FOR YOUR ANSWERS!!!

原文：https://stackoverflow.com/questions/43352515