在选项卡中的列表视图中刷新活动 (Android)

Question

我在选项卡活动的选项卡中有一个列表视图。假设 Activity 的名称是“Main”。我想要它，所以当我按下列表视图中的一个项目（它在一个选项卡中，它在一个活动中）时，它会刷新“主要”（整体活动）。

Answer 1

使用 onItemClickListener() 作为您的列表视图，如下所示。

在下面的例子中，当点击“Item 1”时，MainActivity 将重新启动。

ListView listView=findViewById(R.id.list_view);
List<String> mList= Arrays.asList("Item 1","Item 2","Item 3");
listView.setAdapter(new ListViewAdapter(this,R.layout.list_item_layout,mList));

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //Restart activity when Item 1 gets clicked
                if("Item 1".equals(parent.getAdapter().getItem(position).toString())){
                    startActivity(new Intent(MainActivity.this,MainActivity.class));
                    finish();
                }
            }
        });

示例：ListViewAdapter.class

public class ListViewAdapter extends ArrayAdapter<String> {
    private List<String>  mList;

    public ListViewAdapter(@NonNull Context context, int resource, @NonNull List<String> list) {
        super(context, resource, list);
        this.mList = list;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_layout,parent,false);
        }

        ((TextView) convertView.findViewById(R.id.tv_item)).setText(getItem(position));
        return convertView;
    }

    @Nullable
    @Override
    public String getItem(int position) {
        return mList.get(position);
    }
}

考虑到您在选项卡式活动中使用 FragmentPagerAdapter， 您可以将ListView的代码放在相应片段实例的onCreateView()中，

   @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                 Bundle savedInstanceState) {
            View rootView = inflater.inflate(R.layout.fragment_main, container, false);
            ListView listView=rootView.findViewById(R.id.list_view);
            List<String> mList= Arrays.asList("Item 1","Item 2","Item 3");
            listView.setAdapter(new ListViewAdapter(rootView.getContext(),R.layout.list_item_layout,mList));
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    //Restart activity when Item 1 gets clicked
                    if("Item 1".equals(parent.getAdapter().getItem(position).toString())){
                        if(getActivity()!=null){
                            startActivity(new Intent(getActivity(),MainActivity.class));
                            getActivity().finish();
                        }
                    }
                }
            });
            return rootView;
        }
    }