这段时间一直在玩PopupWindow,前段时间做了一个仿淘宝旅行日期选择的上拉PopupWindow 的小demo,但是其日期选择我没有实现,这个还是有一定的难度,我只是实
现了其动画效果,做这个东西做了我两天,由于对PopuWindow不是很熟悉,再加上被一个粗心的错误困恼了一段时间(我发现大部分的bug都是来自于程序员的自我粗心,而不是
代码的逻辑错误,我觉得代码的逻辑错误才算的上是真正的bug) ,以及对PopuWindow中ListView的监听掌握的不是很好,也浪费了一段时间,不过最终还是做出来了自己想要
的效果。我们先来说一下PopupWindow的基本用法吧,然后再上图,上代码:
一:popupWindow 的初始化:
popupWindow = new PopupWindow(view, displayWidth, displayHeight);
view 为popupWindow的样式,这个样式可以是自定义的样式,也可以就是一个Button,displayWidth 为显示的宽度,displayHeight为显示的高度
二:设置在屏幕外也能够点击消失:
popupWindow.setOutsideTouchable(true);
三:设置点击返回键也能够消失:
popupWindow.setFocusable(false);
如果是设置为false 那么你这样设置也没用
popupWindow.setBackgroundDrawable(new BitmapDrawable());
因为popupWindow无法获取焦点,你设置背景也没有用,但是如果你设置了popupWindow.setOutsideTouchable(true); 则照样能够点击外面消失,如果没有设置则无法消失
点击返回键也无法消失。所以要想点击返回键是popupWindow消失则必须两则同时设置:
popupWindow.setFocusable(true); popupWindow.setBackgroundDrawable(new BitmapDrawable());
四:返回键失效:
如果你这样进行设置返回键会失效:如果你将setFocusable 设置为true时则不会失效
// 使其聚集 popupWindow.setFocusable(true); // 设置允许在外点击消失 popupWindow.setOutsideTouchable(true); // 刷新状态 popupWindow.update();
但是如果你设置了背景之后,返回键又不会失效:
popupWindow.setOutsideTouchable(true); popupWindow.setFocusable(true); popupWindow.setBackgroundDrawable(new BitmapDrawable()); popupWindow.update();
五:showAsDropDown() 这个方法在popupWindow中有两个个被重写,showAsDropDown(View anchor, int xoff, int yoff),showAsDropDown(View anchor),
anchor 参数为这个popupWindow所依附的控件,其会在这个空间下显示出来,而不用设置popupWindow的位置。,x,y 分别为偏移的位置
六:showAtLocation(View parent, int gravity, int x, int y),这个函数没有依赖具体控件的位置,而是在可以再屏幕上设置其显示的位置,parent 为popupWindow所获取的屏幕
控制的父控件:API是这样介绍的:a parent view to get the getWindowToken()
token from, gravity为设置在屏幕显示的大致位置,是居中还是居左还是居右等等,x,y 则
是设置其在屏幕开始的显示位置(记住屏幕的原点坐标是在屏幕的左上角,朝下的为Y正轴)
这样popupWindow的使用方法基本上就介绍完了,下面上代码和图:
由于不是在一台手机上截的图,所以大小不一样,我做的还没有去调整颜色,按钮什么的所以就将就着吧,这个可以点击进行选择。
下面上代码吧,首先写适配器:我的是继承了BaseAdapter
public class CancelTaskListAdapter extends BaseAdapter{ Context context; String causeArray[]; private OnClickListener onClickListener; private OnItemClickListener mOnItemClickListener; public CancelTaskListAdapter(Context context,String causeArray[]){ this.context = context; this.causeArray = causeArray; init(); } @Override public int getCount() { return causeArray.length; } @Override public Object getItem(int arg0) { return causeArray[arg0]; } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int position, View convertView, ViewGroup parent) { if(convertView==null){ LinearLayout ll = (LinearLayout)LayoutInflater.from(context).inflate(R.layout.cancel_task_item, null); convertView = ll; TextView cause = (TextView)convertView.findViewById(R.id.cause); ImageView select = (ImageView)convertView.findViewById(R.id.select); cause.setText(causeArray[position]); if(MainActivity.positioncause.equals(causeArray[position])){ select.setBackgroundResource(R.drawable.icon_check); } ViewHold hold = new ViewHold(); hold.setCause(cause); hold.setSelect(select); hold.setPosition(position); convertView.setTag(hold); }else{ ViewHold hold = (ViewHold)convertView.getTag(); TextView cause = hold.getCause(); ImageView select = hold.getSelect(); hold.setPosition(position); convertView.setTag(hold); if(select.getResources()!=null){ select.setBackgroundResource(0); } if(MainActivity.positioncause.equals(causeArray[position])){ select.setBackgroundResource(R.drawable.icon_check); } cause.setText(causeArray[position]); } convertView.setOnClickListener(onClickListener); return convertView; } public void setOnItemClickListener(OnItemClickListener listener) { mOnItemClickListener = listener; } /** * 重新定义菜单选项单击接口 */ public interface OnItemClickListener { public void onItemClick(View view,int position); } public void init(){ onClickListener = new OnClickListener(){ @Override public void onClick(View v) { if(mOnItemClickListener!=null){ ViewHold hold = (ViewHold)v.getTag(); int num = hold.getPosition(); mOnItemClickListener.onItemClick(v,num); notifyDataSetChanged(); } } }; } class ViewHold { private TextView cause; private ImageView select; private int position; public int getPosition() { return position; } public void setPosition(int position) { this.position = position; } public TextView getCause() { return cause; } public void setCause(TextView cause) { this.cause = cause; } public ImageView getSelect() { return select; } public void setSelect(ImageView select) { this.select = select; } } }
然后是按钮的监听,ListView的监听:
public class MainActivity extends Activity implements OnClickListener{ public static String positioncause = null; String cancelArray[] = {"另约时间地点","客户要求销案","任务已改派","联系不上","请示改派","已去远程定损点","其它"}; Button cancel; PopupWindow popupWindow; ListView cancelCauseList; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); cancel = (Button)findViewById(R.id.button1); cancel.setOnClickListener(this); } @Override public void onClick(View v){ CancelTask cancelTask = new CancelTask(this, cancelArray); cancelTask.setOnClickListener(new OnClickListener() { @Override public void onClick(View v){ switch(v.getId()){ case R.id.cancel: popupWindow.dismiss(); popupWindow = null; Log.i("MainActivity", "取消"); break; case R.id.sure: Toast.makeText(MainActivity.this, positioncause, Toast.LENGTH_SHORT).show(); cancel.setEnabled(false); popupWindow.dismiss(); popupWindow=null; Log.i("MainActivity", "确定"); break; } } }); } class CancelTask{ Context context; String causeArray[]; TextView canceltv,sure; int displayWidth; int displayHeight; View view; CancelTaskListAdapter adapter; public CancelTask(Context context,String causeArray[]){ this.context = context; this.causeArray = causeArray; init(); } public void showPopupWindow(){ popupWindow.showAtLocation(cancel, Gravity.BOTTOM,displayWidth/2,0); } public void hidePopupWindow(){ if(popupWindow!=null&&popupWindow.isShowing()){ popupWindow.dismiss(); popupWindow = null; } } public void setOnClickListener(OnClickListener listener){ canceltv.setOnClickListener(listener); sure.setOnClickListener(listener); } public void init(){ view = LayoutInflater.from(context).inflate(R.layout.cancel_task, null); cancelCauseList = (ListView)view.findViewById(R.id.list_cause); canceltv = (TextView)view.findViewById(R.id.cancel); sure = (TextView)view.findViewById(R.id.sure); adapter = new CancelTaskListAdapter(context, causeArray); cancelCauseList.setAdapter(adapter); adapter.setOnItemClickListener(itemClickListener()); displayWidth = ((Activity) context).getWindowManager().getDefaultDisplay().getWidth(); displayHeight = ((Activity) context).getWindowManager().getDefaultDisplay().getHeight(); System.out.println(displayHeight); System.out.println(displayWidth); MainActivity.positioncause = causeArray[1]; startAnimation(); } public void startAnimation(){ if(popupWindow==null){ popupWindow = new PopupWindow(view, displayWidth, displayHeight*3/4); popupWindow.setAnimationStyle(R.style.PopupWindowAnimation); popupWindow.setOutsideTouchable(true); popupWindow.setFocusable(true); popupWindow.setBackgroundDrawable(new BitmapDrawable()); // popupWindow.update(); } showPopupWindow(); } CancelTaskListAdapter.OnItemClickListener itemClickListener(){ CancelTaskListAdapter.OnItemClickListener listener = new OnItemClickListener(){ public void onItemClick(View view,int position) { positioncause = causeArray[position]; } }; return listener; } } }