android学习——popupWindow 在指定位置上的显示

先看效果图，免得浪费大家时间，看是不是想要的效果 。



直接上代码 ，核心方法。

private void showPopupWindow(View parent) {
if (popupWindow == null) {
LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.group_list, null);
lv_group = (ListView) view.findViewById(R.id.lvGroup);

Collections.reverse(groups);
GroupAdapter groupAdapter = new GroupAdapter(this, groups);
lv_group.setAdapter(groupAdapter);
popupWindow = new PopupWindow(view, 200, 220);
}
popupWindow.setFocusable(true);
popupWindow.setOutsideTouchable(true);
// 这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景
popupWindow.setBackgroundDrawable(new BitmapDrawable());
WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
int xPos = -popupWindow.getWidth() / 2
+ getCustomTitle().getCenter().getWidth() / 2;

popupWindow.showAsDropDown(parent, xPos, 4);

lv_group.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view,
int position, long id) {
loadNew(((StringItem)(groups.get(position))).getId());
if (popupWindow != null)
popupWindow.dismiss();
}
});
}

view.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
int measuredWidth = view.getMeasuredWidth();
int measuredHeight = view.getMeasuredHeight();

if (popupWindow == null) {
popupWindow = new PopupWindow(view, LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT, true);
}
popupWindow.setFocusable(true);
popupWindow.setOutsideTouchable(true);
// 这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景
//popupWindow.setBackgroundDrawable(new BitmapDrawable());
popupWindow.showAsDropDown(v,v.getWidth()+ Utils.dip2px(HomeWorkActivity.this, 8),
-(measuredHeight/2 + v.getHeight()/2));

popupWindow.setTouchInterceptor(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_OUTSIDE){
popupWindow.dismiss();
return true;
}
return false;
}
});
popupWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {

}
});

popupWindow 在控件的各个方向上的显示（上、下、左、右），主要用到popupWindow 的showAtLocation(）方法：

在控件的上方：

[java] view
plaincopy

private void showPopUp(View v) {  

        LinearLayout layout = new LinearLayout(this);  

        layout.setBackgroundColor(Color.GRAY);  

        TextView tv = new TextView(this);  

        tv.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));  

        tv.setText("I'm a pop -----------------------------!");  

        tv.setTextColor(Color.WHITE);  

        layout.addView(tv);  

  

        popupWindow = new PopupWindow(layout,120,120);  

          

        popupWindow.setFocusable(true);  

        popupWindow.setOutsideTouchable(true);  

        popupWindow.setBackgroundDrawable(new BitmapDrawable());  

          

        int[] location = new int[2];  

        v.getLocationOnScreen(location);  

          

        popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0], location[1]-popupWindow.getHeight());  

    }  

在控件的其他方向上显示只需修改最后一行代码即可，如：

下方：popupWindow.showAsDropDown(v);

左边：

[java] view
plaincopy

popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]-popupWindow.getWidth(), location[1]);  

右边：

[html] view
plaincopy

popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, location[0]+v.getWidth(), location[1]);