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Java 为什么图像在展开和折叠时不改变。?_Java_Android - Fatal编程技术网

Java 为什么图像在展开和折叠时不改变。?

Java 为什么图像在展开和折叠时不改变。?,java,android,Java,Android,你能告诉我为什么我的图像在我改变我的展开和折叠列表视图时没有改变。这两次我都得到了相同的图像。当我展开它时,我会在下面的图像中显示(+)图像。为什么 这是我的密码 主要活动 public class MainActivity extends Activity { ExpandableListAdapter listAdapter; ExpandableListView expListView; List<String> listDataHeader;

你能告诉我为什么我的图像在我改变我的展开和折叠列表视图时没有改变。这两次我都得到了相同的图像。当我展开它时,我会在下面的图像中显示(+)图像。为什么

这是我的密码

主要活动

public class MainActivity extends Activity {

    ExpandableListAdapter listAdapter;
    ExpandableListView expListView;
    List<String> listDataHeader;
    HashMap<String, List<String>> listDataChild;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // get the listview
        expListView = (ExpandableListView) findViewById(R.id.lvExp);

        // preparing list data
        prepareListData();

        listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild);

        // setting list adapter
        expListView.setAdapter(listAdapter);

        // Listview Group click listener
        expListView.setOnGroupClickListener(new OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                    int groupPosition, long id) {
                // Toast.makeText(getApplicationContext(),
                // "Group Clicked " + listDataHeader.get(groupPosition),
                // Toast.LENGTH_SHORT).show();
                return false;
            }
        });

        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                if(listDataHeader.get(groupPosition) != null)
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Expanded",
                        Toast.LENGTH_SHORT).show();
            }
        });

        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Collapsed",
                        Toast.LENGTH_SHORT).show();

            }
        });

        // Listview on child click listener
        expListView.setOnChildClickListener(new OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                    int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                Toast.makeText(
                        getApplicationContext(),
                        listDataHeader.get(groupPosition)
                                + " : "
                                + listDataChild.get(
                                        listDataHeader.get(groupPosition)).get(
                                        childPosition), Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });
    }

    /*
     * Preparing the list data
     */
    private void prepareListData() {
        listDataHeader = new ArrayList<String>();
        listDataChild = new HashMap<String, List<String>>();

        // Adding child data
        listDataHeader.add("Top 250");
        listDataHeader.add("Now Showing");
        listDataHeader.add("Coming Soon..");

        // Adding child data
        List<String> top250 = new ArrayList<String>();
        top250.add("The Shawshank Redemption");
        top250.add("The Godfather");
        top250.add("The Godfather: Part II");
        top250.add("Pulp Fiction");
        top250.add("The Good, the Bad and the Ugly");
        top250.add("The Dark Knight");
        top250.add("12 Angry Men");

        List<String> nowShowing = new ArrayList<String>();
        nowShowing.add("The Conjuring");
        nowShowing.add("Despicable Me 2");
        nowShowing.add("Turbo");
        nowShowing.add("Grown Ups 2");
        nowShowing.add("Red 2");
        nowShowing.add("The Wolverine");

        /*List<String> comingSoon = new ArrayList<String>();
        comingSoon.add("2 Guns");
        comingSoon.add("The Smurfs 2");
        comingSoon.add("The Spectacular Now");
        comingSoon.add("The Canyons");
        comingSoon.add("Europa Report");*/

        listDataChild.put(listDataHeader.get(0), top250); // Header, Child data
        listDataChild.put(listDataHeader.get(1), nowShowing);
        listDataChild.put(listDataHeader.get(2), null);
    }
}
公共类MainActivity扩展活动{
可扩展列表适配器;
ExpandableListView解释视图;
列表列表数据头;
HashMapListDataChild;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//获取列表视图
expListView=(ExpandableListView)findViewById(R.id.lvExp);
//准备列表数据
prepareListData();
listAdapter=新的ExpandableListAdapter(此,listDataHeader,listDataChild);
//设置列表适配器
expListView.setAdapter(listAdapter);
//Listview组单击侦听器
expListView.setOnGroupClickListener(新OnGroupClickListener(){
@凌驾
公共布尔值onGroupClick(ExpandableListView父视图,视图v,
int groupPosition,长id){
//Toast.makeText(getApplicationContext(),
//“组单击”+listDataHeader.get(groupPosition),
//吐司。长度(短)。show();
返回false;
}
});
//Listview组扩展侦听器
expListView.setOnGroupExpandListener(新的OnGroupExpandListener(){
@凌驾
public void onGroupExpand(int groupPosition){
if(listDataHeader.get(groupPosition)!=null)
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition)+“Expanded”,
吐司。长度(短)。show();
}
});
//Listview组压缩侦听器
expListView.setOnGroupCollapseListener(新OnGroupCollapseListener(){
@凌驾
公共void-onGroupCollapse(int-groupPosition){
Toast.makeText(getApplicationContext(),
listDataHeader.get(groupPosition)+“折叠”,
吐司。长度(短)。show();
}
});
//子单击侦听器上的Listview
setOnChildClickListener(新的OnChildClickListener(){
@凌驾
公共布尔onChildClick(ExpandableListView父视图,视图v,
int groupPosition、int childPosition、long id){
//TODO自动生成的方法存根
Toast.makeText(
getApplicationContext(),
listDataHeader.get(groupPosition)
+ " : "
+listDataChild.get(
listDataHeader.get(groupPosition)).get(
儿童位置),吐司。长度(短)
.show();
返回false;
}
});
}
/*
*准备列表数据
*/
私有void prepareListData(){
listDataHeader=新的ArrayList();
listDataChild=newHashMap();
//添加子数据
添加(“前250名”);
添加(“现在显示”);
添加(“即将推出…”);
//添加子数据
List top250=新的ArrayList();
top250.添加(“肖申克的救赎”);
添加(“教父”);
top250.添加(“教父:第二部分”);
top250.添加(“低俗小说”);
添加(“好、坏、丑”);
添加(“黑暗骑士”);
添加(“12个愤怒的男人”);
List nowShowing=新建ArrayList();
现在显示。添加(“变戏法”);
添加(“卑鄙的我2”);
现在显示。添加(“Turbo”);
现在显示。添加(“成年人2”);
现在显示。添加(“红色2”);
现在显示。添加(“狼獾”);
/*List comingSoon=新建ArrayList();
很快就来。添加(“2支枪”);
很快就来。添加(“蓝精灵2”);
即将到来。添加(“现在的壮观”);
即将到来。添加(“峡谷”);
即将出版。添加(“欧罗巴报告”)*/
listDataChild.put(listDataHeader.get(0),top250);//头,子数据
listDataChild.put(listDataHeader.get(1),现在显示);
listDataChild.put(listDataHeader.get(2),null);
}
}
适配器

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;

    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(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);
        }

        TextView txtListChild = (TextView) convertView
                .findViewById(R.id.lblListItem);

        txtListChild.setText(childText);
        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        if(this._listDataChild.get(this._listDataHeader.get(groupPosition))!=null)
        return this._listDataChild.get(this._listDataHeader.get(groupPosition))
                .size();
        return 0;
    }

    @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);
        View ind = convertView.findViewById( R.id.explist_indicator);
        if( ind != null ) {
            ImageView indicator = (ImageView)ind;
            if( getChildrenCount( groupPosition ) == 0 ) {
                indicator.setVisibility( View.INVISIBLE );
            } else {
                indicator.setVisibility( View.VISIBLE );
                int stateSetIndex = ( isExpanded ? 1 : 0) ;
                Drawable drawable = indicator.getDrawable();
            }
        }

        return convertView;
    }

    @Override
    public boolean hasStableIds() {
        return false;
    }

    @Override
    public boolean isChildSelectable(int groupPosition, int childPosition) {
        return true;
    }

}
公共类ExpandableListAdapter扩展了BaseExpandableListAdapter{
私人语境(private Context)(私人语境);;
私有列表_listDataHeader;//头标题
//标题标题、子标题格式的子数据
私有HashMap_listDataChild;
公共ExpandableListAdapter(上下文、列表listDataHeader、,
HashMap listChildData){
这._context=context;
这。_listDataHeader=listDataHeader;
这。_listDataChild=listChildData;
}
@凌驾
公共对象getChild(int-groupPosition、int-ChildPosition){
返回此。_listDataChild.get(此。_listDataHeader.get(groupPosition))
.get(childpositionon);
}
@凌驾
公共长getChildId(int-groupPosition,int-childPosition){
返回子位置;
}
@凌驾
公共视图getChildView(int groupPosition,final int childPosition,
布尔值isLastChild、视图转换视图、视图组父级){
最终字符串childText=(字符串)getChild(groupPosition,childPosition);
if(convertView==null){
LayoutInflater infalInflater=(LayoutInflater)this.\u上下文
.getSystemService(上下文布局\充气机\服务);
convertView=infalInflater.充气(R.layout.list_项,空);
}
TextView txtListChild=(TextView)convertVi
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#f4f4f4" >

            <ExpandableListView
                android:id="@+id/lvExp"
                android:layout_height="match_parent"
                android:layout_width="match_parent"
                android:cacheColorHint="#00000000"
                android:groupIndicator="@android:color/transparent"
                />   

</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="8dp" 
    android:background="#000000">

<ImageView android:src="@drawable/test"
    android:id="@+id/explist_indicator"
    android:layout_width="20px"
    android:layout_height="20px"/>
    <TextView
        android:id="@+id/lblListHeader"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="?android:attr/expandableListPreferredItemPaddingLeft"
        android:textSize="17dp"
        android:textColor="#f9f93d" />

</LinearLayout>
![<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="55dip"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/lblListItem"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="17dip"
        android:paddingTop="5dp"
        android:paddingBottom="5dp"
        android:textColor="#000000"
        android:paddingLeft="?android:attr/expandableListPreferredChildPaddingLeft" />

</LinearLayout>][1]
@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);
        View ind = convertView.findViewById(R.id.explist_indicator);
        if (ind != null) {
            ImageView indicator = (ImageView) ind;

            if (isExpanded) {
                indicator.setImageResource(R.drawable.icon_3);
            } else {
                indicator.setImageResource(R.drawable.icon_4);
            }

            if (getChildrenCount(groupPosition) == 0) {
                indicator.setVisibility(View.INVISIBLE);
            } else {
                indicator.setVisibility(View.VISIBLE);
            }
        }

        return convertView;
    }
  <ImageView
        android:id="@+id/explist_indicator"
        android:layout_width="20px"
        android:layout_height="20px"
        android:src="@drawable/icon_4" />