如何在android中创build一个popup窗口?

我需要在android中创build一个popup窗口 。 我的要求是在页面1我会保持一个超链接 ,当我点击它应该打开一个popup窗口 。 我经历了许多教程,并尝试过,但没有一个为我工作。 请帮助我如何在android中创build一个popup窗口

import android.app.Activity; import android.os.Bundle; import android.view.Gravity; import android.view.View; import android.widget.Button; import android.widget.LinearLayout; import android.widget.PopupWindow; import android.widget.TextView; import android.view.ViewGroup.LayoutParams; public class ShowPopUpWindow extends Activity { boolean isClicked = true; PopupWindow popUpWindow; LayoutParams layoutParams; LinearLayout mainLayout; Button btnClickHere; LinearLayout containerLayout; TextView tvMsg; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); containerLayout = new LinearLayout(this); mainLayout = new LinearLayout(this); popUpWindow = new PopupWindow(this); btnClickHere = new Button(this); btnClickHere.setText("Click Here For Pop Up Window !!!"); btnClickHere.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { if (isClicked) { isClicked = false; popUpWindow.showAtLocation(mainLayout, Gravity.BOTTOM, 10, 10); popUpWindow.update(50, 50, 320, 90); } else { isClicked = true; popUpWindow.dismiss(); } } }); tvMsg = new TextView(this); tvMsg.setText("Hi this is pop up window..."); layoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); containerLayout.setOrientation(LinearLayout.VERTICAL); containerLayout.addView(tvMsg, layoutParams); popUpWindow.setContentView(containerLayout); mainLayout.addView(btnClickHere, layoutParams); setContentView(mainLayout); } }