怎样抽取一个PopupWindow工具类

怎样抽取一个PopupWindow工具类

• 为什么要抽取一个PopupWindow工具类？
  在开发中遇到多个弹框，而且弹框的样式和和弹框的操作和Dialog不一，在项目中，多个地方都遇到了弹框，所以抽取一个PopupWindow还是很有必要的。
• 如何抽取一个PopupWindow呢？
  • 首先，我们先要明白封装一个PopupWindow的输入是什么？输出又是什么？
    • 输入：一般一个PopupWindow有标题，展现的数据
    • 输出：输出的是一个PopupWindow
• 代码抽取
  • 定义一个静态的工具类，工具类中有一个方法，主要是引入PopupWindow布局，以及PopupWindow的初始化工作，如下（数据比较多的时候迪调用这个方法）：

  public static PopupWindow mulPop;
  private static TextView outTextView;
  public static void mulItemPop(Context context,TextView navTvTitle,TextView outTextView,String title,String[] lists){
        View customView = LayoutInflater.from(context).inflate(R.layout.layout_mul_popwindow, null);
        PopwindowUtil.outTextView=outTextView;
        ListView lvPop = (ListView) customView.findViewById(R.id.lv_pop);
        ((TextView) customView.findViewById(R.id.tv_pop_title)).setText(title);
        lvPop.setAdapter(new CommonAdapter(context,lists));
        mulPop = new PopupWindow(customView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, true);
        mulPop.update();
        mulPop.setTouchable(true);
        mulPop.setFocusable(true);
        ColorDrawable dw = new ColorDrawable(0xa0000000);
        mulPop.setBackgroundDrawable(dw);
        mulPop.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        customView.setOnTouchListener(new View.OnTouchListener() {
  
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                if (mulPop != null && mulPop.isShowing()) {
                    mulPop.dismiss();
                    mulPop = null;
                }
  
                return false;
            }
        });
        mulPop.setAnimationStyle(R.style.popupwindow_anim_style);
        mulPop.showAtLocation(navTvTitle, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
    }
    private static class CommonAdapter extends BaseAdapter {
        private String[] lists;
        private Context context;
  
        public CommonAdapter(Context context,String[] lists) {
            this.context=context;
            this.lists = lists;
        }
  
        @Override
        public int getCount() {
            return lists.length;
        }
  
        @Override
        public Object getItem(int position) {
            return lists[position];
        }
  
        @Override
        public long getItemId(int position) {
            return position;
        }
  
        @Override
        public View getView(final int position, View convertView, ViewGroup parent) {
            final CommonHolder holder;
            if (convertView == null) {
                holder = new CommonHolder();
                convertView = LayoutInflater.from(context).inflate(R.layout.list_item_pop, null);
                holder.tv_item = (TextView) convertView.findViewById(R.id.tv_item);
                convertView.setTag(holder);
            } else {
                holder = (CommonHolder) convertView.getTag();
            }
            holder.tv_item.setText(lists[position]);
            holder.tv_item.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    outTextView.setText(lists[position]);
                    if (mulPop != null && mulPop.isShowing()) {
                        mulPop.dismiss();
                        mulPop = null;
                    }
                }
            });
            return convertView;
        }
    }
    private static class CommonHolder {
        TextView tv_item;
    }
  

  其中参数navTvTitle是用于给PopupWindow设置位置的，outTextView是用于给弹框下面的界面设置数据的，title是PopupWindow的标题，lists是PopupWindow的数据。这个方法的逻辑就是先引入xml，然后对xml的控件初始化并且设置数据。
  数据比较少时，封装的方法（3个以内）如：

  public static PopupWindow littlePop;
   private static TextView outTextView;
   public static void littlePop(Context context, TextView navTvTitle, final TextView outTextView, String title, final String[] lists){
        View customView = LayoutInflater.from(context).inflate(R.layout.layout_little_popwindow, null);
        PopwindowUtil.outTextView=outTextView;
        TextView tvContent1=(TextView)customView.findViewById(R.id.tv_content1);
        TextView tvContent2=(TextView)customView.findViewById(R.id.tv_content2);
        TextView tvContent3=(TextView)customView.findViewById(R.id.tv_content3);
        if(lists.length==2){
            tvContent1.setText(lists[0]);
            tvContent2.setText(lists[1]);
            tvContent3.setVisibility(View.GONE);
        }else{
            tvContent1.setText(lists[0]);
            tvContent2.setText(lists[1]);
            tvContent3.setText(lists[2]);
        }
        customView.findViewById(R.id.tv_content1).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                outTextView.setText(lists[0]);
                littlePop.dismiss();
            }
        });
        customView.findViewById(R.id.tv_content2).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                outTextView.setText(lists[1]);
                littlePop.dismiss();
            }
        });
        customView.findViewById(R.id.tv_content3).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                outTextView.setText(lists[2]);
                littlePop.dismiss();
            }
        });
  
        ((TextView) customView.findViewById(R.id.tv_pop_title)).setText(title);
        littlePop = new PopupWindow(customView, LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT, true);
        littlePop.update();
        littlePop.setTouchable(true);
        littlePop.setFocusable(true);
        ColorDrawable dw = new ColorDrawable(0xa0000000);
        littlePop.setBackgroundDrawable(dw);
        littlePop.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        customView.setOnTouchListener(new View.OnTouchListener() {
  
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                // TODO Auto-generated method stub
                if (littlePop != null && littlePop.isShowing()) {
                    littlePop.dismiss();
                    littlePop = null;
                }
  
                return false;
            }
        });
        littlePop.setAnimationStyle(R.style.popupwindow_anim_style);
        littlePop.showAtLocation(navTvTitle, Gravity.BOTTOM | Gravity.CENTER_HORIZONTAL, 0, 0);
    }
  

• 如何使用？

  if (PopwindowUtil.mulPop!= null && PopwindowUtil.mulPop.isShowing()) {
            PopwindowUtil.mulPop.dismiss();
            PopwindowUtil.mulPop = null;
  } else {
      PopwindowUtil.littlePop(TestPopActivity.this,tv_pop,tv_pop,"标题",new String[]{"haha","afee"});
  }