所以我正在创建一个应用程序,其中一个功能是您可以设置警报。下面是我使用适配器放入ListView的2个示例警报。每个项目都有一个ImageView,一个TextView和另一个ImageView。
我的问题是我如何为不同的图像打开onClickListener
,甚至可能根据我的工作方式打开文本。
例如,当您单击“x”时,它将从列表中删除该警报(向我显示如何执行并让适配器知道已删除警报会很酷)或单击警报图片将激活/停用警报(可以在看到的两个图像之间切换)。
此屏幕来自MainActivity
AlertFragment
。在过去,我遇到了Fragments实现内部类的问题,但我现在设置它的方式是(我认为)Fragments实现内部类。这就是我目前所知道的错误:
public class AlertsFragment extends Fragment {
private ListView mListView;
private List<Alert> alerts = new ArrayList<>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_alerts, container, false);
mListView = (ListView) rootView.findViewById(R.id.alerts_list_view);
alerts.add(new Alert(1, 5400, true));
alerts.add(new Alert(2, 120, false));
AlertsAdapter adapter = new AlertsAdapter(getActivity(), R.layout.alert_item_row, alerts);
mListView.setAdapter(adapter);
getActivity().setTitle(new AlertsItem().getLabel());
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {
Log.d("matt", "list_item");
ImageView img = (ImageView) getActivity().findViewById(R.id.active_image);
img.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
Log.d("matt", "image");
alerts.get(position).setActive(!alerts.get(position).isActive());
}
});
}
});
return rootView;
}
}
你们可以给予的任何帮助都将不胜感激,谢谢。
----------------------------------------------- ----------编辑--------------------------------------- ------------------
正如一些人所要求的,这是我的ArrayAdapter代码:
/**
* Adapter for adding Alerts to ListView
*/
public class AlertsAdapter extends ArrayAdapter {
private int resource;
List<Alert> objects;
public AlertsAdapter(Context context, int resource, List<Alert> objects) {
super(context, resource, objects);
this.resource = resource;
this.objects = objects;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
AlertHolder holder = null;
if (row == null) {
LayoutInflater inflater = ((Activity)getContext()).getLayoutInflater();
row = inflater.inflate(resource, parent, false);
holder = new AlertHolder();
holder.imgActive = (ImageView)row.findViewById(R.id.active_image);
holder.txtTitle = (TextView)row.findViewById(R.id.txt_title);
holder.txtTime = (TextView)row.findViewById(R.id.txt_time);
row.setTag(holder);
}
else {
holder = (AlertHolder)row.getTag();
}
Alert alert = (Alert) getItem(position);
int image;
if (alert.isActive()) {
image = R.drawable.ic_alert_active_medium;
}
else {
image = R.drawable.ic_alert_inactive_medium;
}
holder.imgActive.setImageResource(image);
holder.txtTitle.setText("Route " + Integer.toString(alert.getRoute()));
int min = alert.getTime() / 60;
int hr = min / 60;
min = min % 60;
holder.txtTime.setText(((hr == 0) ? "" : (Integer.toString(hr) + " hr ")) + Integer.toString(min) + " min ");
return row;
}
private static class AlertHolder {
ImageView imgActive;
TextView txtTitle;
TextView txtTime;
}
}
答案 0 :(得分:2)
创建自己的Adapter
,扩展ArrayAdapter
(请参阅this link),覆盖getView()
方法,然后您可以在其中添加OnClickListener
个View
的孩子ListView
。要通知ListView
某个孩子已被删除,请致电notifyDataSetChanged()
ListView
上的Adapter
。
您可以使用ListView
解决此问题,但我建议您使用RecyclerView
(Android RecyclerView)。 RecyclerView
更好地支持更新其子项(如删除,插入,更新子项),并设置了默认动画。
答案 1 :(得分:0)
您必须在AlertsAdapter类中管理单击侦听器,以获取单独的视图,例如x按钮,图像。
答案 2 :(得分:0)
您可以在onClick方法中处理此问题。例;
public MyViewHolder(final View itemView) {
super(itemView);
iconImageView = (ImageView) itemView.findViewById(R.id.myRecyclerImageView);
iconTextView = (TextView) itemView.findViewById(R.id.myRecyclerTextView);
itemView.setOnClickListener(this);
iconTextView.setOnClickListener(this);
iconImageView.setOnLongClickListener(this);
}
// onClick Listener for view
@Override
public void onClick(View v) {
if (v.getId() == iconTextView.getId()){
Toast.makeText(v.getContext(), "ITEM PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}