扩展列表视图中的Android：编辑特定子/视图问题 [英] Expandable List View in Android: edit specific child/view issue
本文介绍了扩展列表视图中的Android：编辑特定子/视图问题的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
挫折和越来越接近解决问题的天后，我从来没有真正成功地做到这一点。我的想法是编辑特定的孩子的int onChildClick方法的颜色（和其他属性）。在这个例子中，我用一个TextView（但我也想用复选框的expandablelistview并控制孩子的选中状态）。
after days of frustration and getting close to solving the problem, I never really managed to do it. My idea is to edit the color (and other properties) of a specific child int the onChildClick method. For this example I was using a TextView (but I also wanted to use an expandablelistview of checkboxes and control the Checked state of a child).
适配器是这样：
package org.ksinstitute.arsenieboca;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;
public class ExpandableListAdapter extends BaseExpandableListAdapter {
private Context _context;
private List<String> _listDataHeader; // header titles
// child data in format of header title, child title
private HashMap<String, List<String>> _listDataChild;
//ArrayList<ArrayList<Integer>> check_states = new ArrayList<ArrayList<Integer>>();
public ExpandableListAdapter(Context context, List<String> listDataHeader,
HashMap<String, List<String>> listChildData) {
this._context = context;
this._listDataHeader = listDataHeader;
this._listDataChild = listChildData;
}
@Override
public Object getChild(int groupPosition, int childPosititon) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.get(childPosititon);
}
@Override
public long getChildId(int groupPosition, int childPosition) {
return childPosition;
}
@Override
public View getChildView(final int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String childText = (String) getChild(groupPosition, childPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_item, null);
}
//or CheckBox
TextView txtListChild = (TextView) convertView
.findViewById(R.id.lblListItem);
txtListChild.setText(childText);
return convertView;
}
@Override
public int getChildrenCount(int groupPosition) {
return this._listDataChild.get(this._listDataHeader.get(groupPosition))
.size();
}
@Override
public Object getGroup(int groupPosition) {
return this._listDataHeader.get(groupPosition);
}
@Override
public int getGroupCount() {
return this._listDataHeader.size();
}
@Override
public long getGroupId(int groupPosition) {
return groupPosition;
}
@Override
public View getGroupView(int groupPosition, boolean isExpanded,
View convertView, ViewGroup parent) {
String headerTitle = (String) getGroup(groupPosition);
if (convertView == null) {
LayoutInflater infalInflater = (LayoutInflater) this._context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = infalInflater.inflate(R.layout.list_group, null);
}
TextView lblListHeader = (TextView) convertView
.findViewById(R.id.lblListHeader);
lblListHeader.setTypeface(null, Typeface.BOLD);
lblListHeader.setText(headerTitle);
return convertView;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
return true;
}
}
和主要活动的部分：
expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {
View _lastColored;
@Override
public boolean onChildClick(ExpandableListView parent, View v,
int groupPosition, int childPosition, long id) {
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+ listDataChild.get(
listDataHeader.get(groupPosition)).get(
childPosition)
+ ", "
+ groupPosition + "." + childPosition + "\n"
+ "id=" + (int)id, Toast.LENGTH_SHORT)
.show();
**v.setBackgroundColor(Color.BLUE);**
listAdapter.notifyDataSetChanged();
return false;
}
});
好了，有什么用发生在： v.setBackgroundColor（Color.BLUE）; ？我收到以下行为：
当我点击一个孩子，原来自己变成蓝色，但在对方类另一个孩子（好像几乎是随机的）变成蓝色！
When I click a child, it turns itself into blue, but in each other category another child (seems like almost random) turns blue!
我怎么只能编辑pressed孩子的财产，这样用户就知道他是什么$ $ p pssed，
How can I edit the property of ONLY the pressed child, so the user knows what he pressed,
感谢您！
推荐答案
您可以参考以下逻辑：
/* The click listner for ListView in the navigation drawer */
private class DrawerItemClickListener implements ListView.OnItemClickListener {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// selected item's color (semi-transparent)
for (int i = 0; i < parent.getChildCount(); i++) {
if (position == i) {
parent.getChildAt(i).setBackgroundColor(Color.parseColor("#66868686"));
} else {
parent.getChildAt(i).setBackgroundColor(Color.TRANSPARENT);
}
}
}
}
然后在的onCreate ，可以使用以下内容：
...
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.left_drawer);
// set up the drawer's list view with items and click listener
mDrawerList.setAdapter(new ArrayAdapter<>(this, R.layout.drawer_list_item, itemTitles));
mDrawerList.setOnItemClickListener(new DrawerItemClickListener());
...
希望这有助于！
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