如果在Activity的OnCreate()事件輸出那些引數，是全為0，要等UI控制元件都載入完了才能獲取到這些。

附上部分程式碼：獲取Button在整個螢幕視窗內的位置

                            int[] location = new int[2];
				button.getLocationOnScreen(location);
				int x = location[0];
				int y = location[1];
				Log.e("位置", "X軸座標："+x+"Y軸座標:"+y)；<pre name="code" class="html">System.out.println("button的各個角的座標Left："+button.getLeft()+"Right："+<span style="font-family: Verdana, Arial, Helvetica, sans-serif;">button</span><span style="font-family: Verdana, Arial, Helvetica, sans-serif;">.getRight()+"Top："+button.getTop()+"Bottom："+button.getBottom());  </span>  
 

public class MainActivity extends Activity {

	private PopupWindow popupWindow;
	private Button button01;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		popupWindow = new PopupWindow(LayoutInflater.from(this).inflate(R.layout.popupwindow, null), 200, 200);
		popupWindow.setFocusable(true);
		popupWindow.setOutsideTouchable(true);
		//popupWindow.setAnimationStyle(R.style.popupwindow);
		popupWindow.setBackgroundDrawable(getResources().getDrawable(R.drawable.ic_launcher));
		//假如設定了  setBackgroundDrawable 就算沒有設定 .setoutsideTouchable 也可以點選popupwindow之外的地方使popupwindow消失
		//只設置了  setfocusable  而沒設定 setbackgroundDrawable  點選Popupwindow 之外的地方  popupwindow不消失
		

		button01 = (Button) findViewById(R.id.button01);
		//Button button02 = (Button) findViewById(R.id.button02);
		button01.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				int[] location = new int[2];
				button01.getLocationOnScreen(location);
				int x = location[0];
				int y = location[1];
				Log.e("位置", "X位置："+x+"Y位置:"+y);
				popupWindow.showAtLocation(v, Gravity.NO_GRAVITY, x, y-popupWindow.getHeight());
			}
		});
	}