Android UI开发第三篇——popupwindow

PopupWindow在android.widget包下，弹出窗口的形式展示。官方文档对该控件的描述是：“一个弹出窗口控件，可以用来显示任意视图(View)，而且会浮动在当前 活动(activity)的顶部”。PopupWindow可以让我们实现多种自定义控件，例如：menu、alertdialog等弹窗似的View。

popupwindow需要在onCreate时初始化、通过触发事件展示出来。

public class ShowPopupWindow extends Activity implements View.OnClickListener{

View view;

PopupWindow pop;

Button btnShowAsDrawDown;

Button btnShowAsDrawDown1;

Button btnShowAtLocation;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.popup_activity);

btnShowAsDrawDown = (Button)findViewById(R.id.btnShowAsDrawDown);

btnShowAsDrawDown.setOnClickListener(this);

btnShowAsDrawDown1 = (Button)findViewById(R.id.btnShowAsDrawDown1);

btnShowAsDrawDown1.setOnClickListener(this);

btnShowAtLocation = (Button)findViewById(R.id.btnShowAt);

btnShowAtLocation.setOnClickListener(this);

initPopupWindow();

}

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

switch(v.getId())

{

case R.id.btnShowAsDrawDown:

if(pop.isShowing())

{

pop.dismiss();

}

else

{

pop.showAsDropDown(v);

}

break;

case R.id.btnShowAsDrawDown1:

if(pop.isShowing())

{

pop.dismiss();

}

else

{

pop.showAsDropDown(v, 0, -160);

}

break;

default:

if(pop.isShowing())

{

pop.dismiss();

}

else

{

pop.showAtLocation(findViewById(R.id.main), Gravity.CENTER_HORIZONTAL, 0, 0);

}

break;

}

}

private void initPopupWindow()

{

view = this.getLayoutInflater().inflate(R.layout.popup_window, null);

pop = new PopupWindow(view, ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);

pop.setOutsideTouchable(true);

view.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

// TODO Auto-generated method stub

pop.dismiss();

}

});

}

}

popup_activity.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:orientation="vertical"

android:id="@+id/main"

android:layout_width="fill_parent"

android:layout_height="fill_parent">

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="pop demo!"

/>

<Button

android:id="@+id/btnShowAsDrawDown"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Show as drawndown(one parameter)"

/>

<Button

android:id="@+id/btnShowAsDrawDown1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Show as drawndown(three parameters)"

/>

<Button

android:id="@+id/btnShowAt"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="Show At Location"

/>

</LinearLayout>

popup_window.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:orientation="vertical"

android:gravity="center_horizontal"

android:background="#d3d3d3">

<Button

android:id="@+id/btn_pop"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="Close"

android:layout_margin="10dip" />

</LinearLayout>

/**
* @author 张兴业
* 邮箱：[e-mail]
* qq:363302850
*
*/