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>
