可下拉输入框

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在登录界面输入用户名的时候，每次输入比较麻烦，于是如果有下拉输入框可选择会比较方便，使用dialog也可以跳出一个框以供选择，但是似乎没有下拉输入框体验号，这只是个细节的部分，于是记录下来方便以后使用

自定义适配器

package com.sdu.zeng.dropdownedittext;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ImageView;import android.widget.TextView;import java.util.List;/** * Created by shiweixian on 2017/5/24. * 用户输入框下拉选择 */public class UsernameListAdapter extends BaseAdapter {    private List<String> list;    private Context context;    public UsernameListAdapter(List<String> list, Context context) {        this.list = list;        this.context = context;    }    @Override    public int getCount() {        return list.size();    }    @Override    public Object getItem(int i) {        return list.get(i);    }    @Override    public long getItemId(int i) {        return i;    }    @Override    public View getView(final int i, View view, ViewGroup viewGroup) {        ViewHolder holder;        if (view == null) {            view = LayoutInflater.from(context).inflate(R.layout.item_list_username, null);            holder = new ViewHolder();            holder.tvUsername = (TextView) view.findViewById(R.id.tv_username);            holder.ivDelete = (ImageView) view.findViewById(R.id.iv_delete);            view.setTag(holder);        } else {            holder = (ViewHolder) view.getTag();        }        holder.tvUsername.setText(list.get(i));        holder.ivDelete.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                //TODO 弹出对话框，输入密码正确后，从数据库删除该条用户                list.remove(i);                notifyDataSetChanged();            }        });        return view;    }    private class ViewHolder {        TextView tvUsername;        ImageView ivDelete;    }}

2.显示下拉列表的popupWindow弹框

private void showPopupWindow(View view) {        View contentView = LayoutInflater.from(this).inflate(                R.layout.popup_list, null);        drop_view_list = (ListView) contentView.findViewById(R.id.drop_view_list);        drop_view_list.setAdapter(adapter);        drop_view_list.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> adapter, View view, int position,                                    long arg3) {                edit_username.setText(list.get(position));                popupWindow.dismiss();            }        });        popupWindow = new PopupWindow(contentView,                LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT, true);        popupWindow.setOutsideTouchable(true);        popupWindow.setTouchable(true);        popupWindow.setTouchInterceptor(new View.OnTouchListener() {            @Override            public boolean onTouch(View arg0, MotionEvent arg1) {                // 这里如果返回true的话，touch事件将被拦截                // 拦截后 PopupWindow的onTouchEvent不被调用，这样点击外部区域无法dismiss                return false;            }        });        //如果不设置PopupWindow的背景，无论是点击外部区域还是Back键都无法dismiss弹框        popupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.white));        // 设置好参数之后再show        popupWindow.showAsDropDown(view, 0, 0);        popupWindow.setAnimationStyle(R.style.AnimationFade);        popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {            @Override            public void onDismiss() {                iv_drop.setImageResource(R.drawable.icon_down);            }        });    }

完整项目下载连接：
http://download.csdn.net/download/zengxyuyu/9854942

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