Static class in Android
I have a question, I confuss about when I must use class static.
I understand that I have use class static when I need some methods that going to use many times in the code, and that class doesn´t need to be declarate, but in a example in android I find that code.
Where they declare a static class and call it with an instance...
Why did they do that?
public View getView(int position, View view, ViewGroup viewGroup) {
//View holder pattern
**ViewHolder holder;**
if(view ==null){
LayoutInflater layoutInflater=LayoutInflater.from(this.context);
view=layoutInflater.inflate(R.layout.list_item,null);
**holder=new ViewHolder();**
holder.txtView =(TextView) view.findViewById(R.id.txtView);
view.setTag(holder);
}
return view;
}
**static class ViewHolder{
private TextView txtView;
}**
Thanks for your explanation..
static
asked Nov 22 at 21:19
crista
93
add a comment |
I have a question, I confuss about when I must use class static.
I understand that I have use class static when I need some methods that going to use many times in the code, and that class doesn´t need to be declarate, but in a example in android I find that code.
Where they declare a static class and call it with an instance...
Why did they do that?
public View getView(int position, View view, ViewGroup viewGroup) {
//View holder pattern
**ViewHolder holder;**
if(view ==null){
LayoutInflater layoutInflater=LayoutInflater.from(this.context);
view=layoutInflater.inflate(R.layout.list_item,null);
**holder=new ViewHolder();**
holder.txtView =(TextView) view.findViewById(R.id.txtView);
view.setTag(holder);
}
return view;
}
**static class ViewHolder{
private TextView txtView;
}**
Thanks for your explanation..
static
asked Nov 22 at 21:19
crista
93
add a comment |
I have a question, I confuss about when I must use class static.
I understand that I have use class static when I need some methods that going to use many times in the code, and that class doesn´t need to be declarate, but in a example in android I find that code.
Where they declare a static class and call it with an instance...
Why did they do that?
public View getView(int position, View view, ViewGroup viewGroup) {
//View holder pattern
**ViewHolder holder;**
if(view ==null){
LayoutInflater layoutInflater=LayoutInflater.from(this.context);
view=layoutInflater.inflate(R.layout.list_item,null);
**holder=new ViewHolder();**
holder.txtView =(TextView) view.findViewById(R.id.txtView);
view.setTag(holder);
}
return view;
}
**static class ViewHolder{
private TextView txtView;
}**
Thanks for your explanation..
static
asked Nov 22 at 21:19
crista
93
I have a question, I confuss about when I must use class static.
I understand that I have use class static when I need some methods that going to use many times in the code, and that class doesn´t need to be declarate, but in a example in android I find that code.
Where they declare a static class and call it with an instance...
Why did they do that?
public View getView(int position, View view, ViewGroup viewGroup) {
//View holder pattern
**ViewHolder holder;**
if(view ==null){
LayoutInflater layoutInflater=LayoutInflater.from(this.context);
view=layoutInflater.inflate(R.layout.list_item,null);
**holder=new ViewHolder();**
holder.txtView =(TextView) view.findViewById(R.id.txtView);
view.setTag(holder);
}
return view;
}
**static class ViewHolder{
private TextView txtView;
}**
Thanks for your explanation..
static
static
asked Nov 22 at 21:19
crista
93
asked Nov 22 at 21:19
crista
93
asked Nov 22 at 21:19
crista
93
asked Nov 22 at 21:19
crista
93
asked Nov 22 at 21:19
crista
93
93
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
The advantage of having a static nested class over an non static one is, that to create an instance of the static nested class you don’t need an instance of the outer class. If you only have a non static inner class you need an object of the outer one to be able to create an instance.
Note that only nested classes can be static.
answered Nov 22 at 21:30
D. McDermott
687
add a comment |
Your Answer
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "1"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53438092%2fstatic-class-in-android%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
The advantage of having a static nested class over an non static one is, that to create an instance of the static nested class you don’t need an instance of the outer class. If you only have a non static inner class you need an object of the outer one to be able to create an instance.
Note that only nested classes can be static.
answered Nov 22 at 21:30
D. McDermott
687
add a comment |
The advantage of having a static nested class over an non static one is, that to create an instance of the static nested class you don’t need an instance of the outer class. If you only have a non static inner class you need an object of the outer one to be able to create an instance.
Note that only nested classes can be static.
answered Nov 22 at 21:30
D. McDermott
687
add a comment |
The advantage of having a static nested class over an non static one is, that to create an instance of the static nested class you don’t need an instance of the outer class. If you only have a non static inner class you need an object of the outer one to be able to create an instance.
Note that only nested classes can be static.
answered Nov 22 at 21:30
D. McDermott
687
The advantage of having a static nested class over an non static one is, that to create an instance of the static nested class you don’t need an instance of the outer class. If you only have a non static inner class you need an object of the outer one to be able to create an instance.
Note that only nested classes can be static.
answered Nov 22 at 21:30
D. McDermott
687
answered Nov 22 at 21:30
D. McDermott
687
answered Nov 22 at 21:30
D. McDermott
687
answered Nov 22 at 21:30
D. McDermott
687
687
add a comment |
add a comment |
Thanks for contributing an answer to Stack Overflow!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f53438092%2fstatic-class-in-android%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
