Android中的可扩展列表视图对点击没有反应,它不会扩展

时间:2012-08-05 16:53:34

标签: android expandablelistview

我有一个可扩展的列表视图。我已经放了一些虚拟数据,并且evrything似乎没问题,但是当我运行应用程序时,所有组都处于折叠模式,当我点击它们时它们不会生效。这是截图:

enter image description here

Group的XML是:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/bg_slider"
    android:orientation="horizontal" >


    <TextView
        android:id="@+id/tvRecipeName"
        style="@style/normal_text.bold"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="50dp"
        android:layout_marginRight="5dp"
        android:focusable="false"
        android:lines="1"
        android:maxLines="1"
        android:text="@string/dd_title" />


    <ImageButton
        android:id="@+id/ibDeleteRecipe"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="15dp"
        android:background="@color/transparent"
        android:contentDescription="@string/cd"
        android:focusable="false"
        android:src="@android:drawable/ic_menu_delete" />

    <View
        android:layout_width="1dp"
        android:layout_height="50dp"
        android:layout_alignParentLeft="true"
        android:layout_toLeftOf="@+id/tvRecipeName"
        android:focusable="false" />

</RelativeLayout>

孩子的XML是:

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/White"
    android:gravity="left|center_vertical" >

    <View
        android:layout_width="1dp"
        android:layout_height="35dp"
        android:layout_toLeftOf="@+id/tvIngredient"
        android:focusable="false" />

    <TextView
        android:id="@+id/tvIngredient"
        style="@style/normal_text_black"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="30dp"
        android:layout_marginRight="5dp"
        android:lines="1"
        android:maxLines="1"
        android:text="@string/dd_title"
        android:focusable="false" />

    <ImageButton
        android:id="@+id/ibDeleteIngredient"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_centerVertical="true"
        android:layout_marginRight="15dp"
        android:background="@color/transparent"
        android:contentDescription="@string/cd"
        android:focusable="false"
        android:src="@android:drawable/btn_dialog" />

</RelativeLayout>

在main.xml中,可扩展列表的定义是:

<ExpandableListView
            android:id="@+id/elv"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

我有一个适配器,我为此编写了这段代码:

public class ExpAdapter extends BaseExpandableListAdapter {

    private final String TAG = "ExpAdapter";
    private Context context;
    static final String arrGroupelements[] = {"India", "Australia", "England", "South Africa"};
    static final String arrChildelements[][] = { {"Sachin Tendulkar", "Raina", "Dhoni", "Yuvi" },
                                                 {"Ponting", "Adam Gilchrist", "Michael Clarke"},
                                                 {"Andrew Strauss", "kevin Peterson", "Nasser Hussain"},
                                                 {"Graeme Smith", "AB de villiers", "Jacques Kallis"} };

    public ExpAdapter(Context context) {
        this.context = context;

        Log.i(TAG, "Adapter created.");
    }


    @Override
    public Object getChild(int groupPosition, int childPosition) {
        return null;
    }

    @Override
    public long getChildId(int groupPosition, int childPosition) {

        return 0;
    }

    @Override
    public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater inflater =  (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.elv_child, null);
        }

        TextView tvItem = (TextView) convertView.findViewById(R.id.tvIngredient);
        ImageButton ibDelete = (ImageButton) convertView.findViewById(R.id.ibDeleteIngredient);
        ibDelete.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i(TAG, "******");
            }
        });
        tvItem.setText(arrChildelements[groupPosition][childPosition]);

        return convertView;
    }

    @Override
    public int getChildrenCount(int groupPosition) {
        return arrChildelements[groupPosition].length;
    }

    @Override
    public Object getGroup(int groupPosition) {
        return null;
    }

    @Override
    public int getGroupCount() {
        return arrGroupelements.length;
    }

    @Override
    public long getGroupId(int groupPosition) {
        return 0;
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.elv_group, null);
        }

        TextView tvItem = (TextView) convertView.findViewById(R.id.tvRecipeName);
        ImageButton ibDeleteRcipe = (ImageButton) convertView.findViewById(R.id.ibDeleteRecipe);
        ibDeleteRcipe.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i(TAG, "%%%%%%");
            }
        });
        tvItem.setText(arrGroupelements[groupPosition]);

        return convertView;
    }

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

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

}

最后,在片段活动的代码中,我有:

public class ShoppingList extends FragmentActivity {    
        ExpAdapter adapter = new ExpAdapter(this);
        //Linking expnadable list view
        expListView = (ExpandableListView) findViewById(R.id.elv);
        expListView.setAdapter(adapter);
        expListView.setOnGroupExpandListener(new OnGroupExpandListener() {
            @Override
            public void onGroupExpand(int groupPosition) {
                Log.i(TAG, "Group " + groupPosition + " expanded.");
            }
        });
        expListView.setOnGroupCollapseListener(new OnGroupCollapseListener() {
            @Override
            public void onGroupCollapse(int groupPosition) {
                Log.i(TAG, "Group " + groupPosition + " collapsed.");
            }
        });
        expListView.setOnChildClickListener(new OnChildClickListener() {
            @Override
            public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {
                Log.i(TAG, "item " + childPosition + " of group " + groupPosition + " clicked.");
                return false;
            }
        });

}

当我运行应用程序并单击父母时,没有任何反应。我尝试在购物类结束时添加以下代码行:

int count = adapter.getGroupCount();
for (int position = 1; position <= count; position++)
    expListView.expandGroup(position - 1);

现在,当我运行应用程序结果时,就像这个截图:

enter image description here

如果我点击删除按钮(父母或孩子),我可以看到它们生效(因为我检查了logcat),但是当我点击孩子或父母时没有任何反应。所以,我不知道为什么回调不起作用。根据我的研究,我发现我需要将Focussable图像按钮设置为false。正如你在XML文件中看到的那样,我做到了,但是当我点击父行和子行时,我看不到任何响应。

2 个答案:

答案 0 :(得分:31)

最后我找到了解决方案:)

我不知道是虫子或疾病还是......

如上所述,基于我的研究,我发现我们需要将图像视图/框的焦点能力设置为“假”。我在XML文件中做到了它并没有用。我将焦点能力设置为XML中的“true”,并在代码中将其设置为false。像这样:

@Override
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {

        if (convertView == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.elv_group, null);
        }

        TextView tvItem = (TextView) convertView.findViewById(R.id.tvRecipeName);
        ImageButton ibDeleteRcipe = (ImageButton) convertView.findViewById(R.id.ibDeleteRecipe);
        ibDeleteRcipe.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {               
                ...
            }
        });
        ibDeleteRcipe.setFocusable(false);

        tvItem.setText(arrGroupElements[groupPosition]);

        return convertView;
    }
因此,基于我的成就!它应该在不是XML的代码中设置为“false”!现在的问题是有什么区别? - 我不知道。

答案 1 :(得分:3)

有必要在布局xml中为可扩展列表视图项中的可聚焦视图定义android:focusable="false",而不是在&#34; ExpandableListView &#34;属性。

例如:如果自定义父列表项包含一个复选框(它将自动获得焦点),它应该如下所示。

<CheckBox
   android:id="@+id/cbkSelectDownload"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:focusable="false"/>
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