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This article mainly shows you "how to use ButterKnife 8.5.1". The content is simple and clear. I hope it can help you solve your doubts. Let the editor lead you to study and learn this article "how to use ButterKnife 8.5.1".

Introduction to ButterKnife

ButterKnife is a View injection framework focused on Android systems, which can reduce a lot of findViewById and setOnClickListener code. After version 7. 0, the annotation processor is introduced, which replaces the previous implementation of findViewById using reflection principle to affect the performance of APP, and no longer affects the running efficiency of APP.

Instructions for use:

ButterKnife.bind (this) is used in 1.Activity; must be in setContentView (); after that, after bind in the parent class, the subclass no longer needs to bind

Use ButterKnife.bind (this, rootView) in 2.Fragment; root layout View object, which needs to be unbound in onDestroyView

3. The attribute of the annotation cannot be modified with private or static, otherwise an error will be reported.

There is no unbinding operation in the official example of 4.Activity, but Fragment needs to be unbound.

Steps to use:

1. Add dependencies

Compile 'com.jakewharton:butterknife:8.5.1'

AnnotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'

Note: you only need to add the above dependencies to use.

The following steps are required only if you are using ButterKnife in Library:

1. Add: to the build.gradle of Project:

Classpath'com.jakewharton:butterknife-gradle-plugin:8.5.1'

2. Add: in the corresponding Library (Module):

Apply plugin:'com.jakewharton.butterknife'

Many online articles regard the above two steps as necessary. No!

(note: To use ButterKnife in a library)

Actual project

In a real project, you usually define a BaseActivity or BaseFragment, which is bound in the base class and can be used directly in all its subclasses. It is important to note that the parent class needs to be bound after the setContentView call of the subclass.

Use the complete example

Public class MainActivity extends AppCompatActivity {@ BindView (R.id.textview) TextView textview; @ BindView (R.id.button) Button button; @ Override protected void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.layout_new); ButterKnife.bind (this) } @ OnClick ({R.id.textview, R.id.button}) public void onViewClicked (View view) {switch (view.getId ()) {case R.id.textview: break; case R.id.button: break;} @ BindView (R.id.textview) / / declare and bind the variable TextView textview / / equivalent to: TextViewtextView = (TextView) findViewById (R.id.textView); @ OnClick (R.id.button) / / bind the button to the method without declaring the reference variable public void onViewClicked () {} @ BindViews ({R.id.button1, R.id.button2, R.id.button3}) public List mList; @ BindString (R.string.app_name) / / bind string String str; @ BindArray (R.array.city) / / bind array String [] arr

Used in fragment (needs to be unbound)

Private Unbinder unbinder;@Overridepublic View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {View view = inflater.inflate (R.layout.fragment_regist_create, container, false); unbinder = ButterKnife.bind (this, view); / / need to add one more View object return view;} @ Overridepublic void onDestroyView () {super.onDestroyView (); unbinder.unbind (); / / fragment needs to be unbound}

A little more lazy.

Android Studio plug-in: Android Butterknife Zelezny

It is convenient to generate comments for the entire layout file with one click.

How to use it:

In setContentView (R.layout.activity_main), right-click activity_main, generate,Generate ButterKnife Injections, and check the control that needs to generate annotations

The picture is from android-butterknife-zelezny

Summary

Generally speaking, I think it is very convenient to simplify findViewById and setOnClickListener. Instead of using all aspects of ButterKnife, it works very well in multi-control interfaces such as submitting form data. This is why the rule of "80thumb 20" is in effect. For other features that are less used, such as unbinding, try again when you need it!

Reference documentation

[Android Development] Summary of the tutorial on how to use ButterKnife8.5.1

Frame reference of the same type

Google/dagger

Https://github.com/google/dagger

Androidannotations

Https://github.com/androidannotations/androidannotations

Appendix:

Annotation type

* @ BindViews

* @ BindView

* @ BindArray

* @ BindBitmap

* @ BindBool

* @ BindColor

* @ BindDimen

* @ BindDrawable

* @ BindFloat

* @ BindInt

* @ BindString

Event type

* @ OnClick

* @ OnCheckedChanged

* @ OnEditorAction

* @ OnFocusChange

* @ OnItemClick item

* @ OnItemLongClick

* @ OnItemSelected

* @ OnLongClick

* @ OnPageChange

* @ OnTextChanged

* @ OnTouch

* @ Optional

=

Instructions on Github:

Download

Dependencies {

Compile 'com.jakewharton:butterknife:8.5.1'

AnnotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'

}

Snapshots of thedevelopment version are available in Sonatype's snapshots repository.

Library projects

To use ButterKnife in a library, add the plugin to your buildscript:

Buildscript {

Repositories {

MavenCentral ()

}

Dependencies {

Classpath 'com.jakewharton:butterknife-gradle-plugin:8.5.1'

}

}

And then apply it in your module:

Apply plugin: 'com.android.library'

Apply plugin: 'com.jakewharton.butterknife'

Now make sureyou use R2 instead of R inside allButter Knife annotations.

ClassExampleActivityextendsActivity {

@ BindView (R2.id.user) EditText username

@ BindView (R2.id.pass) EditText password

...

}

The above is all the contents of the article "how to use ButterKnife 8.5.1". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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