Use and extension of popupwindow

Popupwindow

 

[Function]

Popupwindow is a kind of user reminder, and its overhead is smaller than activity.

 

 

[Code steps]

1. Define the layout for popupwindow, for example, hello. xml

 

Java code

1. <? XML version =
   "1.0"
   Encoding =
   "UTF-8"
   ?>
   
2. <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
   
   
3. Android: Orientation = "horizontal"
   
   
4. Android: layout_width = "fill_parent"
   
   
5. Android: layout_height = "fill_parent"
   
   
6. Android: padding = "10dp"
   
   
7. >
8. <Imageview
9. Android: Id = "@ + ID/image"
   
   
10. Android: layout_width = "wrap_content"
    
    
11. Android: layout_height = "wrap_content"
    
    
12. Android: src = "@ drawable/robot"
    />
    
13. <Linearlayout
14. Android: Orientation = "vertical"
    
    
15. Android: layout_width = "wrap_content"
    
    
16. Android: layout_height = "wrap_content"
    
    
17. Android: paddingleft = "20dip"
    
    
18. >
19. <Textview
20. Android: layout_width = "wrap_content"
    
    
21. Android: layout_height = "wrap_content"
    
    
22. Android: text = "hellopop! "
    
    
23. />
24. <Button
25. Android: Id = "@ + ID/hellobutton"
    
    
26. Android: layout_width = "100dip"
    
    
27. Android: layout_height = "wrap_content"
    
    
28. Android: text = "OK"
    
    
29. />
30. </Linearlayout>
31. </Linearlayout>

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: Orientation = "horizontal" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent" Android: padding = "10dp"> <imageview Android: Id = "@ + ID/image" Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: src = "@ drawable/robot"/> <linearlayout Android: Orientation = "vertical" Android: Layout _ Width = "wrap_content" Android: layout_height = "wrap_content" Android: paddingleft = "20dip"> <textview Android: layout_width = "wrap_content" Android: layout_height = "wrap_content" Android: TEXT = "hellopop! "/> <Button Android: Id =" @ + ID/hellobutton "Android: layout_width =" 100dip "Android: layout_height =" wrap_content "Android: TEXT = "OK"/> </linearlayout>

 

 

2. Use layoutinflater to get the view of Hello. xml

Java code

1. View =
   This
   . Getlayoutinflater (). Inflate (R. layout. Hello,
   Null
   );
   

View = This. getlayoutinflater (). Inflate (R. layout. Hello, null );

 

3. Create popupwindow pop and use the above layout File View

Java code

1. Pop =
   New
   Popupwindow (view,
   500
   ,
   200
   );
   

Pop = new popupwindow (view, 500,200 );

 

4. Pop-up popupwindow

* Layout definition file: Main. xml includes a button

Java code

1. <? XML version =
   "1.0"
   Encoding =
   "UTF-8"
   ?>
   
2. <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
   
   
3. Android: Orientation = "vertical"
   
   
4. Android: Id = "@ + ID/main"
   
   
5. Android: layout_width = "fill_parent"
   
   
6. Android: layout_height = "fill_parent"
   
   
7. >
8. <Textview
9. Android: layout_width = "fill_parent"
   
   
10. Android: layout_height = "wrap_content"
    
    
11. Android: text = "Pop demo! "
    
    
12. />
13. <Button
14. Android: Id = "@ + ID/button"
    
    
15. Android: layout_width = "fill_parent"
    
    
16. Android: layout_height = "wrap_content"
    
    
17. Android: text = "to pop! "
    
    
18. />
19. </Linearlayout>

<? 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/button "Android: layout_width =" fill_parent "Android: layout_height =" wrap_content "Android: text =" to pop! "/> </Linearlayout>

 

 

* Pop-up: There are two modes: one is the drop-down mode and the other is the specified location.

-Drop-down list:

Java code

1. Findviewbyid (R. Id. Button). setonclicklistener (
   New
   View. onclicklistener (){
   
3. Public
    
   Void
   Onclick (view v ){
   
4. // Todo auto-generated method stub
   
   
5. Pop. showasdropdown (v );
6. }
8. });

Findviewbyid (R. id. button ). setonclicklistener (new view. onclicklistener () {public void onclick (view v) {// todo auto-generated method stub pop. showasdropdown (v );}});

 

 

-Specified location:

Java code

1. Findviewbyid (R. Id. Button). setonclicklistener (
   New
   View. onclicklistener (){
   
3. Public
    
   Void
   Onclick (view v ){
   
4. // Todo auto-generated method stub
   
   
5. Pop. showatlocation (findviewbyid (R. Id. Main), gravity. Center, 20
   ,
   20
   );
   
7. }
9. });

Findviewbyid (R. id. button ). setonclicklistener (new view. onclicklistener () {public void onclick (view v) {// todo auto-generated method stub pop. showatlocation (findviewbyid (R. id. main), gravity. center, 20, 20 );}});

 

 

5. Cancel

Java code

1. View. findviewbyid (R. Id. hellobutton). setonclicklistener (
   New
   View. onclicklistener (){
   
3. Public
    
   Void
   Onclick (view v ){
   
4. // Todo auto-generated method stub
   
   
5. Pop. Dismiss ();
7. }
9. });

View. findviewbyid (R. id. hellobutton ). setonclicklistener (new view. onclicklistener () {public void onclick (view v) {// todo auto-generated method stub pop. dismiss ();}});

 

6. Other problems:

* I found that many people have doubts about which item is clicked after the listview is included in the popupwindow. So I tested it and found that it is the same as the general method. There is nothing special about it. share

 

It is written that because listview is expanded and displayed, it will lead to poor appearance, so take the spinner as an example.

 

 

6.1. Define the layout file "Hello. xml" containing the spinner

Java code

1. <? XML version =
   "1.0"
   Encoding =
   "UTF-8"
   ?>
   
2. <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
   
   
3. Android: Orientation = "vertical"
   
   
4. Android: layout_width = "fill_parent"
   
   
5. Android: layout_height = "fill_parent"
   
   
6. >
7. <Linearlayout
8. Android: Orientation = "horizontal"
   
   
9. Android: layout_width = "fill_parent"
   
   
10. Android: layout_height = "wrap_content"
    
    
11. >
12. <Imageview
13. Android: Id = "@ + ID/image"
    
    
14. Android: layout_width = "wrap_content"
    
    
15. Android: layout_height = "wrap_content"
    
    
16. Android: src = "@ drawable/robot"
    />
    
17. <Textview
18. Android: layout_width = "wrap_content"
    
    
19. Android: layout_height = "wrap_content"
    
    
20. Android: text = "hellopop! "
    
    
21. />
22. </Linearlayout>
23. <Spinner
24. Android: Id = "@ + ID/Spinner"
    
    
25. Android: layout_width = "wrap_content"
    
    
26. Android: layout_height = "40dip"
    />
    
27. </Linearlayout>

<? XML version = "1.0" encoding = "UTF-8"?> <Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android" Android: Orientation = "vertical" Android: layout_width = "fill_parent" Android: layout_height = "fill_parent"> <linearlayout Android: orientation = "horizontal" Android: layout_width = "fill_parent" Android: layout_height = "wrap_content"> <imageview Android: Id = "@ + ID/image" Android: layout_width = "wrap_content" Android: layout_height = "wrap_conten T "Android: src =" @ drawable/robot "/> <textview Android: layout_width =" wrap_content "Android: layout_height =" wrap_content "Android: text =" hellopop! "/> </Linearlayout> <spinner Android: Id =" @ + ID/Spinner "Android: layout_width =" wrap_content "Android: layout_height =" 40dip "/> </linearlayout>

 

6.2. Get the instance of the spinner: Spinner

Java code

1. Spinner = (spinner) view. findviewbyid (R. Id. spinner );
   

Spinner = (spinner) view. findviewbyid (R. Id. spinner );

 

6.3. Bind a spinner with specific data. In this example, contact is used as an example.

Java code

1. Public
    
   Void
   Specifyspinner (){
   
2. Cursor c = getcontentresolver (). Query (people. content_uri,
3. Null
   ,
   Null
   ,
   Null
   ,
   Null
   );
   
4. Simplecursoradapter adapter = new
   Simplecursoradapter (
   This
   ,
   
5. Android. R. layout. simple_list_item_1, C,
6. New
   String [] {People. name },
   
7. New
    
   Int
   [] {Android. R. Id. text1 });
   
8. Adapter. setdropdownviewresource (
9. Android. R. layout. simple_spinner_dropdown_item );
12. Spinner. setadapter (adapter );
13. }

Public void specifyspinner () {cursor c = getcontentresolver (). query (people. content_uri, null, null); simplecursoradapter adapter = new simplecursoradapter (this, android. r. layout. simple_list_item_1, C, new string [] {people. name}, new int [] {android. r. id. text1}); adapter. setdropdownviewresource (Android. r. layout. simple_spinner_dropdown_item); spinner. setadapter (adapter );}

 

Don't forget the contact's access permission:

<Uses-Permission Android: Name = "android. Permission. read_contacts"/>

 

6.4. Obtain specific items:

Java code

1. Spinner. setonitemselectedlistener (
   New
   Onitemselectedlistener (){
   
3. Public
    
   Void
   Onitemselected (adapterview <?> Adapter, view V,
   
4. Int
   POs,
   Long
   ID ){
   
5. Updatetitle (POS );
6. }
8. Public
    
   Void
   Onnothingselected (adapterview <?> Arg0 ){
   
9. // Todo auto-generated method stub
   
   
11. }
13. });

Spinner. setonitemselectedlistener (New onitemselectedlistener () {public void onitemselected (adapterview <?> Adapter, view V, int POs, long ID) {updatetitle (POS);} public void onnothingselected (adapterview <?> Arg0) {// todo auto-generated method stub }});

 

Write updatetitle (INT) to display the position in the title

Public void updatetitle (int I ){
This. settitle ("hellopop:" + I );
}

 

 

6.5. emulator run:

 

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