pop的实际应用

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主页面

ListView lv = (ListView) findViewById(R.id.main_lv);list = new ArrayList<>();for (int i = 0; i < 20; i++) {    list.add("这是第" + i + "条");}lv.setAdapter(new MyAdapter(MainActivity.this,list));

适配器

public class MyAdapter extends BaseAdapter {    private LayoutInflater Inflater;    private ArrayList<String> list;    private TextView tv;    private Context context;    private ImageView img;    private PopupWindow window;    private TextView tv1;     private TextView tv2;    public MyAdapter(Context context, ArrayList<String> list) {        Inflater = LayoutInflater.from(context);        this.context = context;        this.list = list;        initPopView();    }    @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) {        view = View.inflate(context, R.layout.item, null);        tv = view.findViewById(R.id.item_tv);        img = view.findViewById(R.id.item_img);        tv.setText(list.get(i));        img.setOnClickListener(new PopWindow(i));        return view;    }    class PopWindow implements View.OnClickListener {        private int position;        public PopWindow(int position) {            this.position = position;        }//显示在当前item上        @Override        public void onClick(View view) {            int[] ints = new int[2];            view.getLocationInWindow(ints);            int x = ints[0];            int y = ints[1];            showPop(view, position, x, y);        }    }    private void initPopView() {        View view = Inflater.inflate(R.layout.poupwindow_layout, null);        window = new PopupWindow(view, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);      //必须写,不写的话,点击popwindow外面没有效果  window.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#000000")));        //  window.setAnimationStyle(R.style.popWindowAnimation);        //知道popwindow中间的控件 ,去做点击        tv1 = view.findViewById(R.id.t1);               tv2 = view.findViewById(R.id.t2);    }    private void showPop(View parent, final int position, int x, int y) {        //根据view的位置显示popupwindow的位置        window.showAtLocation(parent, 0, x, y);        //根据view的位置popupwindow将显示到他的下面 , 可以通过x ,y 参数修正这个位置        // mPopupWindow.showAsDropDown(parent,0,-50);        //设置popupwindow可以获取焦点,不获取焦点的话 popupwiondow点击无效        window.setFocusable(true);        //点击popupwindow的外部,popupwindow消失        window.setOutsideTouchable(true);        tv2.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                list.remove(position);                notifyDataSetChanged();                if (window.isShowing()) {                    window.dismiss();                }            }        });        tv1.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                if (window.isShowing()) {                    window.dismiss();                }            }        });}}

item的控件

<TextView    android:textSize="25sp"    android:layout_marginTop="15dp"    android:id="@+id/item_tv"    android:layout_width="0dp"    android:layout_height="wrap_content"    android:layout_weight="1" /><ImageView    android:id="@+id/item_img"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:src="@mipmap/ic_launcher" />

popupwindow的控件

  <TextView    android:id="@+id/t1"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginLeft="20dp"    android:text="读文章"    android:textSize="30sp" />    <TextView    android:id="@+id/t2"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginLeft="20dp"    android:text="不感兴趣"    android:textSize="30sp" />

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