The android tutorial USES popupwindow to create a menu example
- 2020-05-24 06:07:59
- OfStack
PopupWindow is a pop-up window that displays any View. It will float above the current window.
Here's the code:
public class MyActivity extends Activity{
private PopupWindow menu;
private LayoutInflater inflater;
private View layout;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// instantiation PopupWindow Create a menu
initMenu();
}
// To determine key Menu display and hide
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(!menu.isShowing()&&keyCode == KeyEvent.KEYCODE_MENU){
show();
}else{
menu.dismiss();
}
if(keyCode == KeyEvent.KEYCODE_BACK&&menu.isShowing()){
menu.dismiss();
}
return true;
}
// instantiation PopupWindow Create a menu
private void initMenu(){
// To obtain LayoutInflater The instance
inflater = (LayoutInflater) this.getSystemService(LAYOUT_INFLATER_SERVICE);
// Gets the layout of the pop-up menu
layout = inflater.inflate(R.layout.menu,null);
// Set up the popupWindow The layout of the
menu = new PopupWindow(layout, WindowManager.LayoutParams.WRAP_CONTENT,WindowManager.LayoutParams.WRAP_CONTENT);
}
// According to the menu
private void show(){
// Set the location
menu.showAtLocation(this.findViewById(R.id.main), Gravity.BOTTOM|Gravity.CENTER_HORIZONTAL,0,0); // Sets the display position on the screen
}
}
Menu layout file:
<?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="horizontal"
>
<ImageView
android:id="@+id/icon_1"
android:background="@drawable/icon_1"
android:layout_width="40dp"
android:layout_height="40dp"/>
<ImageView
android:id="@+id/icon_2"
android:background="@drawable/icon_2"
android:layout_width="40dp"
android:layout_height="40dp"/>
<ImageView
android:id="@+id/icon_3"
android:background="@drawable/icon3"
android:layout_width="40dp"
android:layout_height="40dp"/>
<ImageView
android:id="@+id/icon_4"
android:background="@drawable/icon4"
android:layout_width="40dp"
android:layout_height="40dp"/>
</LinearLayout>