【android】让popupwindow显示在view的上方并与该view水平居中对齐

首先，废话少说，先上效果图：

代码：

public class MainActivity extends Activity implements OnClickListener{private Button showBtn1;private Button showBtn2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);showBtn1 = (Button) findViewById(R.id.showBtn1);showBtn2 = (Button) findViewById(R.id.showBtn2);showBtn1.setOnClickListener(this);showBtn2.setOnClickListener(this);}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubView popupView = LayoutInflater.from(this).inflate(R.layout.popup, null);PopupWindow popupWindow = new PopupWindow(popupView, ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT, true);popupWindow.setBackgroundDrawable(new BitmapDrawable());popupView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);int popupWidth = popupView.getMeasuredWidth();int popupHeight =  popupView.getMeasuredHeight();int[] location = new int[2];switch (v.getId()) {case R.id.showBtn1:    v.getLocationOnScreen(location);    popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, (location[0]+v.getWidth()/2)-popupWidth/2,    location[1]-popupHeight);break;case R.id.showBtn2:    v.getLocationOnScreen(location);    popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, (location[0]+v.getWidth()/2)-popupWidth/2,    location[1]-popupHeight);break;default:break;}}}

Demo下载：http://download.csdn.net/detail/u011494050/7787359

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