1.主要代码：

声明：

private View shareView;
		private PopupWindow pop;

在onCreate方法里：

// 引入窗口配置文件
		shareView = LayoutInflater.from(this).inflate(
				R.layout.jyx_activity_share, null);
		// 创建PopupWindow对象
		pop = new PopupWindow(shareView, LayoutParams.MATCH_PARENT,
				LayoutParams.WRAP_CONTENT, false);
		// 需要设置一下此参数，点击外边可消失
		pop.setBackgroundDrawable(new ColorDrawable());
		// 设置点击窗口外边窗口消失
		pop.setOutsideTouchable(true);
		pop.setAnimationStyle(R.style.AnimationPreview);
		// 设置此参数获得焦点，否则无法点击
		pop.setFocusable(true);
		pop.setOnDismissListener(new OnDismissListener() {

			@Override
			public void onDismiss() {
				ShareSDK.stopSDK(ProductActivity.this);
			}
		});

case R.id.share:
			if (pop != null && !pop.isShowing()) {
				pop.showAtLocation(view.getRootView(), Gravity.BOTTOM, 0, 0);
			}
			break;

		case R.id.btn_cancel:
			if (pop != null && pop.isShowing()) {
				pop.dismiss();
			}
			break;

Android的PopupWindow弹窗(以常见的分享界面为例)