AndroidAnnotations(Code Diet)android快速开发框架 – Peter_zhou

最近用了一款很不错的android快速开发框架,1000行的代码瞬间变成几百行,不用你会后悔的

特点:

(1) 依赖注入:包括view,extras,系统服务,资源等等
(2) 简单的线程模型,通过annotation表示方法运行在ui线程还是后台线程
(3) 事件绑定:通过annotation表示view的响应事件,不用在写内部类
(4) REST客户端:定义客户端接口,自动生成REST请求的实现
(5) 没有你想象的复杂:AndroidAnnotations只是在在编译时生成相应子类
(6) 不影响应用性能:仅50kb,在编译时完成,不会对运行时有性能影响。
PS:与roboguice的比较:roboguice通过运行时读取annotations进行反射,所以可能影响应用性能,而AndroidAnnotations在编译时生成子类,所以对性能没有影响

现在我们开始试用这个吧

  • 首先我们要准备一下基本环境

1.因为目前主流市场IDE环境转入android studio,所以我就直说它的搭建环境吧,打开build.gradle(project)文件导入我们需要的编译环境,下载编译环境工具包

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath ‘com.android.tools.build:gradle:1.1.+’
classpath ‘com.neenbedankt.gradle.plugins:android-apt:1.4’ //导入编译AndroidAnnotations框架需要使用的工具包
}
}
tasks.withType(JavaCompile) {
options.encoding = “UTF-8”
}
allprojects {
repositories {
jcenter() //下载jcenter服务器上的插件工具包
}
}

2.打开build.gradle(Module)文件导入我们需要的编译环境,导入下载的工具包apt,下载框架需要的包,然后在运行之前编译的配置,并且输出日志

apply plugin: ‘android’
apply plugin: ‘android-apt’ //导入下载的工具

dependencies {
compile fileTree(include: ‘*.jar’, dir: ‘libs’)
compile project(‘:SwitchCompatLibrary’)
compile ‘com.orhanobut:logger:1.1+’
compile ‘org.androidannotations:androidannotations:3.3.1’ //导入框架包
apt ‘org.androidannotations:androidannotations:3.3.1’ //用之前下载的工具根据框架包编译项目
}
apt{ //输出日志文件
arguments{
trace true
androidManifestFile variant.outputs[0].processResources.manifestFile
}
}

android {
compileSdkVersion 15
buildToolsVersion “21.1.2”
lintOptions{
checkReleaseBuilds false
}
sourceSets {
main {
manifest.srcFile ‘AndroidManifest.xml’
java.srcDirs = [‘src’]
resources.srcDirs = [‘src’]
aidl.srcDirs = [‘src’]
renderscript.srcDirs = [‘src’]
res.srcDirs = [‘res’]
assets.srcDirs = [‘assets’]
jniLibs.srcDirs=[‘libs’]
}

instrumentTest.setRoot(‘tests’)

debug.setRoot(‘build-types/debug’)
release.setRoot(‘build-types/release’)
}
}

大部分情况网络情况不好下,这个包是下载不下来的,我们可以下载在本地放在libs文件下

compile ‘org.androidannotations:androidannotations:3.3.1’ //导入框架包
apt ‘org.androidannotations:androidannotations:3.3.1’ //用之前下载的工具根据框架包编译项目
使用方法compile files(‘libs/androidannotations.jar’)

  • 接下来我们使用了

闲话不多了,直接给代码了,下面这段代码是我们平时一般写android的原生代码

1 public class BookmarksToClipboardActivity extends Activity {
2
3 BookmarkAdapter adapter;
4
5 ListView bookmarkList;
6
7 EditText search;
8
9 BookmarkApplication application;
10
11 Animation fadeIn;
12
13 ClipboardManager clipboardManager;
14
15 @Override
16 protected void onCreate(Bundle savedInstanceState) {
17 super.onCreate(savedInstanceState);
18
19 requestWindowFeature(Window.FEATURE_NO_TITLE);
20 getWindow().setFlags(FLAG_FULLSCREEN, FLAG_FULLSCREEN);
21
22 setContentView(R.layout.bookmarks);
23
24 bookmarkList = (ListView) findViewById(R.id.bookmarkList);
25 search = (EditText) findViewById(R.id.search);
26 application = (BookmarkApplication) getApplication();
27 fadeIn = AnimationUtils.loadAnimation(this, anim.fade_in);
28 clipboardManager = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
29
30 View updateBookmarksButton1 = findViewById(R.id.updateBookmarksButton1);
31 updateBookmarksButton1.setOnClickListener(new OnClickListener() {
32
33 @Override
34 public void onClick(View v) {
35 updateBookmarksClicked();
36 }
37 });
38
39 View updateBookmarksButton2 = findViewById(R.id.updateBookmarksButton2);
40 updateBookmarksButton2.setOnClickListener(new OnClickListener() {
41
42 @Override
43 public void onClick(View v) {
44 updateBookmarksClicked();
45 }
46 });
47
48 bookmarkList.setOnItemClickListener(new OnItemClickListener() {
49
50 @Override
51 public void onItemClick(AdapterView<?> p, View v, int pos, long id) {
52 Bookmark selectedBookmark = (Bookmark) p.getAdapter().getItem(pos);
53 bookmarkListItemClicked(selectedBookmark);
54 }
55 });
56
57 initBookmarkList();
58 }
59
60 void initBookmarkList() {
61 adapter = new BookmarkAdapter(this);
62 bookmarkList.setAdapter(adapter);
63 }
64
65 void updateBookmarksClicked() {
66 UpdateBookmarksTask task = new UpdateBookmarksTask();
67
68 task.execute(search.getText().toString(), application.getUserId());
69 }
70
71 private static final String BOOKMARK_URL = //
72 “http://www.bookmarks.com/bookmarks/{userId}?search={search}”;
73
74
75 class UpdateBookmarksTask extends AsyncTask<String, Void, Bookmarks> {
76
77 @Override
78 protected Bookmarks doInBackground(String… params) {
79 String searchString = params[0];
80 String userId = params[1];
81
82 RestTemplate client = new RestTemplate();
83 HashMap<String, Object> args = new HashMap<String, Object>();
84 args.put(“search”, searchString);
85 args.put(“userId”, userId);
86 HttpHeaders httpHeaders = new HttpHeaders();
87 HttpEntity<Bookmarks> request = new HttpEntity<Bookmarks>(httpHeaders);
88 ResponseEntity<Bookmarks> response = client.exchange( //
89 BOOKMARK_URL, HttpMethod.GET, request, Bookmarks.class, args);
90 Bookmarks bookmarks = response.getBody();
91
92 return bookmarks;
93 }
94
95 @Override
96 protected void onPostExecute(Bookmarks result) {
97 adapter.updateBookmarks(result);
98 bookmarkList.startAnimation(fadeIn);
99 }
100
101 }
102
103 void bookmarkListItemClicked(Bookmark selectedBookmark) {
104 clipboardManager.setText(selectedBookmark.getUrl());
105 }
106
107 }

这段是我们用了框架后写过的代码

1 @NoTitle
2 @Fullscreen
3 @EActivity(R.layout.bookmarks)
4 public class BookmarksToClipboardActivity extends Activity {
5
6 BookmarkAdapter adapter;
7
8 @ViewById
9 ListView bookmarkList;
10
11 @ViewById
12 EditText search;
13
14 @App
15 BookmarkApplication application;
16
17 @RestService
18 BookmarkClient restClient;
19
20 @AnimationRes
21 Animation fadeIn;
22
23 @SystemService
24 ClipboardManager clipboardManager;
25
26 @AfterViews
27 void initBookmarkList() {
28 adapter = new BookmarkAdapter(this);
29 bookmarkList.setAdapter(adapter);
30 }
31
32 @Click({R.id.updateBookmarksButton1, R.id.updateBookmarksButton2})
33 void updateBookmarksClicked() {
34 searchAsync(search.getText().toString(), application.getUserId());
35 }
36
37 @Background
38 void searchAsync(String searchString, String userId) {
39 Bookmarks bookmarks = restClient.getBookmarks(searchString, userId);
40 updateBookmarks(bookmarks);
41 }
42
43 @UiThread
44 void updateBookmarks(Bookmarks bookmarks) {
45 adapter.updateBookmarks(bookmarks);
46 bookmarkList.startAnimation(fadeIn);
47 }
48
49 @ItemClick
50 void bookmarkListItemClicked(Bookmark selectedBookmark) {
51 clipboardManager.setText(selectedBookmark.getUrl());
52 }
53
54 }

1 @Rest(“http://www.bookmarks.com”)
2 public interface BookmarkClient {
3
4 @Get(“/bookmarks/{userId}?search={search}”)
5 Bookmarks getBookmarks(String search, String userId);
6
7 }

对比之后我们发现我们代码少了很多,很多人可能会顾虑代码少了,里面是不是做了很多消耗性能多余的操作,这里大家不用担心,根据AndroidAnnotations写的代码,在编译时生成子类,子类的代码和原生一模一样,所以对性能没有影响

  • 常用地址
  1. api地址和demo地址https://github.com/excilys/androidannotations/wiki/Cookbook
  2. 下载地址https://github.com/excilys/androidannotations
  • 总结
  1. 基本语法就不和大家说呢,对程序员来说有了api文档和demo就行了
  2. 这个框架语法很简单用一下就会了,就是环境有点蛋疼,这里只说了一个IDE环境搭配,其它的大家可以看文档
  3. 东西虽然很好,但是希望android初学者学好基础后再来使用框架,框架是不断推出新的,如果你基础都不知道,以后变迁项目,或者项目报错你会对很多错误很茫然的,对你以后的发展也不好。

本文链接:AndroidAnnotations(Code Diet)android快速开发框架,转载请注明。



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