{"id":1857,"date":"2023-03-29T22:06:40","date_gmt":"2023-03-29T14:06:40","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1857"},"modified":"2023-04-22T09:08:25","modified_gmt":"2023-04-22T01:08:25","slug":"dagger2-usage-details","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/29\/dagger2-usage-details\/","title":{"rendered":"Dagger2\u4f7f\u7528\u8be6\u89e3"},"content":{"rendered":"<h2>Dagger2\u7b80\u4ecb<\/h2>\n<p>Dagger2\u662fDagger\u7684\u5347\u7ea7\u7248\uff0c\u662f\u4e00\u4e2a\u4f9d\u8d56\u6ce8\u5165\u6846\u67b6\uff0c\u7b2c\u4e00\u4ee3\u7531\u5927\u540d\u9f0e\u9f0e\u7684Square\u516c\u53f8\u5171\u4eab\u51fa\u6765\uff0c\u7b2c\u4e8c\u4ee3\u5219\u662f\u7531\u8c37\u6b4c\u63a5\u624b\u540e\u63a8\u51fa\u7684\uff0c\u73b0\u5728\u7531Google\u63a5\u624b\u7ef4\u62a4\u3002<\/p>\n<p>Githu\uff1a<a target=\"_blank\" rel=\"noopener\" href=\"https:\/\/github.com\/google\/dagger\">https:\/\/github.com\/google\/dagger<\/a><\/p>\n<p><!-- more --><\/p>\n<h2>\u4f9d\u8d56\u6ce8\u5165<\/h2>\n<p>\u4f9d\u8d56\u6ce8\u5165\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u79cd\u8bbe\u8ba1\u539f\u5219\uff0c\u5176\u76ee\u7684\u662f\u4e3a\u4e86\u964d\u4f4e\u7a0b\u5e8f\u8026\u5408\uff0c\u8fd9\u4e2a\u8026\u5408\u5c31\u662f\u7c7b\u4e4b\u95f4\u7684\u4f9d\u8d56\u5f15\u8d77\u7684\u3002<\/p>\n<p>\u4e3e\u4e2a\u6817\u5b50:<\/p>\n<pre><code class=\"language-java\">public class ClassA {\n    private ClassB b\n\n    public ClassA(ClassB b) {\n        this.b = b;\n    }\n}<\/code><\/pre>\n<p>\u8fd9\u91cc<code>ClassA<\/code>\u7684\u6784\u9020\u51fd\u6570\u91cc\u4f20\u4e86\u4e00\u4e2a\u53c2\u6570<code>ClassB<\/code>\uff0c\u968f\u7740\u540e\u7eed\u4e1a\u52a1\u589e\u52a0\u4e5f\u8bb8\u53c8\u9700\u8981\u4f20\u5165<code>ClassC<\/code>\u3001<code>ClassD<\/code>\u3002\u8bd5\u60f3\u4e00\u4e0b\u5982\u679c\u4e00\u4e2a\u5de5\u7a0b\u4e2d\u67095\u4e2a\u6587\u4ef6\u4f7f\u7528\u4e86<code>ClassA<\/code>\u90a3\u662f\u4e0d\u662f\u8981\u65395\u4e2a\u6587\u4ef6\uff1f<\/p>\n<p>\u8fd9\u65e2\u4e0d\u7b26\u5408\u5f00\u95ed\u539f\u5219\uff0c\u4e5f\u4e0d\u7b26\u5408\u5355\u4e00\u804c\u8d23\u539f\u5219\uff0c\u8fd9\u4e2a\u65f6\u5019\u5927\u6740\u5668<code>Dagger2<\/code>\u5c31\u8be5\u51fa\u573a\u4e86\uff1a<\/p>\n<pre><code class=\"language-java\">public class ClassA {\n    @inject \n    private ClassB b;\n\n    public ClassA() {\n    }\n}<\/code><\/pre>\n<p>\u901a\u8fc7\u6ce8\u89e3\u7684\u65b9\u5f0f\u5c06<code>ClassB b<\/code>\u6ce8\u5165\u5230<code>ClassA<\/code>\u4e2d\uff0c\u53ef\u4ee5\u7075\u6d3b\u914d\u7f6e<code>ClassA<\/code>\u7684\u5c5e\u6027\u800c\u4e0d\u5f71\u54cd\u5176\u4ed6\u6587\u4ef6\u5bf9<code>ClassA<\/code>\u7684\u4f7f\u7528\u3002<\/p>\n<p>\u7b80\u5355\u7684\u8bf4\uff0c\u5c31\u662f\u4e00\u4e2a\u5de5\u5382\u6a21\u5f0f\uff0c\u7531<code>Dagger<\/code>\u8d1f\u8d23\u521b\u5efa\u5de5\u5382\uff0c\u5e2e\u5fd9\u751f\u4ea7<code>instance<\/code>\u3002\u9075\u4eceJava\u89c4\u8303<code>JSR 330<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u6ce8\u89e3\u3002\u73b0\u5728\u4e0d\u7814\u7a76<code>Dagger2<\/code>\u662f\u5982\u4f55\u6839\u636e\u6ce8\u89e3\u53bb\u751f\u6210\u5de5\u5382\u7684\uff0c\u7406\u89e3\u4e3a\u4ec0\u4e48\u53ef\u4ee5\u5b9e\u73b0<code>DI(Dependency Injection)<\/code>\uff0c\u5982\u4f55\u521b\u5efa<code>IoC(Inverse of Control)<\/code>\u5bb9\u5668\u3002<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.yezhou.me\/AppBlog\/images\/Android\/Dagger2\u4f9d\u8d56\u6ce8\u5165.png\" alt=\"Dagger2\u4f9d\u8d56\u6ce8\u5165\" \/><\/p>\n<h2>Dagger2\u4f7f\u7528<\/h2>\n<p>\u5728\u5b9e\u9645\u9879\u76ee\u4e2d<code>Dagger2<\/code>\u4e00\u822c\u548c<code>MVP<\/code>\u6a21\u5f0f\u914d\u5408\u4f7f\u7528<\/p>\n<h3>\u5f15\u5165Dagger2<\/h3>\n<pre><code>api &#039;com.google.dagger:dagger:2.28.3&#039;\nannotationProcessor &#039;com.google.dagger:dagger-compiler:2.28.3&#039;<\/code><\/pre>\n<h3>\u5b9a\u4e49IView<\/h3>\n<pre><code class=\"language-java\">\/\/IView\u7c7b\npublic interface ICommonView {\n    Context getContext();\n}<\/code><\/pre>\n<h3>\u5b9a\u4e49Module<\/h3>\n<p>\u521b\u5efa\u4e00\u4e2a\u7c7b<code>CommonModule<\/code><\/p>\n<pre><code class=\"language-java\">@Module\npublic class CommonModule {\n    private ICommonView iView;\n\n    public CommonModule(ICommonView iView) {\n        this.iView = iView;\n    }\n\n    @Provides\n    public ICommonView provideIcommonView() {\n        return this.iView;\n    }\n}<\/code><\/pre>\n<h3>\u5b9a\u4e49Component<\/h3>\n<p>\u521b\u5efa\u4e00\u4e2a\u63a5\u53e3CommonComponent<\/p>\n<pre><code class=\"language-java\">@Component (modules = CommonModule.class)\npublic interface CommonComponent {\n    void inject(LoginActivity activity); 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