Question

我正在尝试将自定义ListView放入Dialog。我的代码如下：

dialog = new Dialog(MyWallet.this);

dialog.setContentView(R.layout.emergency_contacts);
dialog.setTitle("Emergency Contacts");
dialog.show();

mAdapter.addInfo("Name");
ListView lv = (ListView) dialog.findViewById(android.R.id.list);
if (lv != null) {
   lv.setAdapter(mAdapter);
}

然后我的自定义Adapter：

    private class MyCustomAdapter extends BaseAdapter {
    private static final int TYPE_INFO = 1;
    private static final int TYPE_MAX_COUNT = 1;
    private LayoutInflater mInflater;
    private int noteFull = 0;

    public MyCustomAdapter() {
        mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }


    public void addInfo(final String info) {
        mInfo.add(info);
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return mInfo.size();
    }

    @Override
    public String getItem(int position) {
        return mInfo.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemViewType(int position) {
            return TYPE_INFO;
    }

    @Override
    public int getViewTypeCount() {
        return TYPE_MAX_COUNT;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        System.out.println("getView " + position + " " + convertView);
        ViewHolder holder = null;
        int type = getItemViewType(position);
        if (convertView == null) {
            holder = new ViewHolder();
            switch (type) {
                case TYPE_INFO:
                    convertView = mInflater.inflate(R.layout.emergency_contacts_list, null);
                    holder.name = (TextView)convertView.findViewById(R.id.name);
                    holder.name.setText(mInfo.get(position));
                    break;
            }
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder)convertView.getTag();
            switch(type) {
                case TYPE_INFO:
                    convertView = mInflater.inflate(R.layout.emergency_contacts_list, null);
                    holder.name = (TextView)convertView.findViewById(R.id.name);
                    holder.name.setText(mInfo.get(position));
                    break;
            }
        }
        return convertView;
    }

}

public static class ViewHolder {
    public TextView name;
    public TextView phoneNumber;
    public TextView emailAddress;
}

代码崩溃（<{1}}位于

holder.name =（TextView）convertView.findViewById（R.id.name）;

我猜是因为NullPointerException不是正确的观点。如何将其设置为右convertView？

修改：View：

Code for emergency_contacts_list

编辑2：完整<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="horizontal"> <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" android:gravity="left"> <TextView android:id="@+id/name" android:layout_height="wrap_content" android:layout_width="wrap_content" android:gravity="left" android:text="Name"> </TextView> <TextView android:id="@+id/phone" android:layout_height="wrap_content" android:layout_width="wrap_content" android:gravity="left" android:text="Phone Number"> </TextView> <TextView android:id="@+id/email" android:layout_height="wrap_content" android:layout_width="wrap_content" android:gravity="left" android:text="Email Address"> </TextView> </LinearLayout> <LinearLayout android:layout_width="fill_parent" android:gravity="right|center_vertical" android:layout_height="match_parent" android:orientation="horizontal"> <Button android:id="@+id/call" android:layout_height="35px" android:layout_width="50px" android:background="@drawable/custom_button" android:layout_margin="3px" android:text="Call"> </Button> </LinearLayout> </LinearLayout> </LinearLayout>：

logcat

Answer 1

显示NullPointerException，因为当convertView方法中的getView()非空（已回收）而非使用时，您会为新{{1} } 到位。 View方法应为：

getView()

Answer 2

在MyCustomAdapter中定义你的静态类。这对你有用。例如

public class MyCustomAdapter extends BaseAdapter {

public static class ViewHolder {
public TextView name;
public TextView phoneNumber;
public TextView emailAddress;
}

}

Answer 3

以下是您应如何进行布局填充的示例代码

    LayoutInflater li = (LayoutInflater)this.getSystemService(LAYOUT_INFLATER_SERVICE);
    View vDialogTextSize = li.inflate(R.layout.options_dialog_textsize, (ViewGroup) findViewById(R.id.Custom_Size_Dialog));

所有信息均来自此网站Dialogs.

对话框中的自定义列表视图

3 个答案: