我有一个可展开的 ListView 。我放了一些虚拟数据，一切看起来都还可以，但是当我运行应用程序时，所有组都处于折叠模式，当我单击每个组时它们都不会生效。这是截图:

组的 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>

child 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，为此我编写了以下代码:

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 fragment Activity 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 parent 时，没有任何反应。我尝试在购物类末尾添加以下代码行:

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

现在我运行应用程序的结果是这样的截图:

如果我单击删除按钮(父或子)，我可以看到它们生效(当我检查 logcat 时)，但是当我单击子或父时没有任何反应。所以，我不知道为什么回调不起作用。根据我的研究，我发现我需要将图像按钮的 Focussable 设置为 false。正如您在 XML 文件中看到的那样，我做到了，但是当我单击父行和子行时，我仍然看不到任何响应。

最佳答案

我终于找到了解决方案:)

我不知道是 bug 还是疾病还是...

如上所述，根据我的研究，我发现我们需要将 ImageView /框的焦点能力设置为“false”。我在 XML 文件中做了它，它没有工作。我在 XML 中将焦点能力设置为“真”，并在代码中将其设置为假。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!它应该在代码而不是 XML 中设置为“false”!现在的问题是有什么区别？ -我不知道。

关于android - Android中的可展开 ListView 对点击没有反应，它不会展开，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/11818278/