{"id":1856,"date":"2023-03-29T22:06:02","date_gmt":"2023-03-29T14:06:02","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=1856"},"modified":"2023-04-22T09:08:33","modified_gmt":"2023-04-22T01:08:33","slug":"getting-started-with-dagger2","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/03\/29\/getting-started-with-dagger2\/","title":{"rendered":"Dagger2\u4f7f\u7528\u5165\u95e8"},"content":{"rendered":"

Dagger2\u7b80\u4ecb<\/h2>\n

Dagger2<\/code>\u662fDagger<\/code>\u7684\u5347\u7ea7\u7248\uff0c\u662f\u4e00\u4e2a\u4f9d\u8d56\u6ce8\u5165\u6846\u67b6\uff0c\u73b0\u5728\u7531Google\u63a5\u624b\u7ef4\u62a4\u3002<\/p>\n

Github\uff1ahttps:\/\/github.com\/google\/dagger<\/a><\/p>\n

<\/p>\n

\u4f9d\u8d56\u6ce8\u5165\u662f\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u7684\u4e00\u79cd\u8bbe\u8ba1\u6a21\u5f0f\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

\u4e3e\u4e2a\u4f8b\u5b50\uff1a\u6211\u4eec\u5728\u5199\u9762\u5411\u5bf9\u8c61\u7a0b\u5e8f\u65f6\uff0c\u5f80\u5f80\u4f1a\u5728\u4e00\u4e2a\u7c7b\u4e2d\u5f15\u7528\u53e6\u4e00\u4e2a\u7c7b\uff0c\u4ece\u800c\u53ef\u4ee5\u8c03\u7528\u5f15\u7528\u7684\u7c7b\u7684\u65b9\u6cd5\u5b8c\u6210\u67d0\u4e9b\u529f\u80fd\uff0c\u5c31\u50cf\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n

public class ClassA {\n    ...\n    ClassB b;\n    ...\n    public ClassA() {\n        b = new ClassB();\n    }\n\n    public void do() {\n        ...\n        b.doSomething();\n        ...\n    }\n}<\/code><\/pre>\n
\u8fd9\u65f6\u5c31\u4ea7\u751f\u4e86\u4f9d\u8d56\u95ee\u9898\uff0cClassA<\/code>\u4f9d\u8d56\u4e8eClassB<\/code>\uff0c\u5fc5\u987b\u501f\u52a9ClassB<\/code>\u7684\u65b9\u6cd5\uff0c\u624d\u80fd\u5b8c\u6210\u4e00\u4e9b\u529f\u80fd\u3002\u8fd9\u6837\u770b\u597d\u50cf\u5e76\u6ca1\u6709\u4ec0\u4e48\u95ee\u9898\uff0c\u4f46\u662f\u6211\u4eec\u5728ClassA<\/code>\u7684\u6784\u9020\u65b9\u6cd5\u91cc\u9762\u76f4\u63a5\u521b\u5efa\u4e86ClassB<\/code>\u7684\u5b9e\u4f8b\uff0c\u95ee\u9898\u5c31\u51fa\u73b0\u5728\u8fd9\uff0c\u5728ClassA<\/code>\u91cc\u76f4\u63a5\u521b\u5efaClassB<\/code>\u5b9e\u4f8b\uff0c\u8fdd\u80cc\u4e86\u5355\u4e00\u804c\u8d23\u539f\u5219<\/strong>\uff0cClassB<\/code>\u5b9e\u4f8b\u7684\u521b\u5efa\u4e0d\u5e94\u7531ClassA<\/code>\u6765\u5b8c\u6210\uff1b\u5176\u6b21\u8026\u5408\u5ea6\u589e\u52a0\uff0c\u6269\u5c55\u6027\u5dee\uff0c\u5982\u679c\u6211\u4eec\u60f3\u5728\u5b9e\u4f8b\u5316ClassB<\/code>\u7684\u65f6\u5019\u4f20\u5165\u53c2\u6570\uff0c\u90a3\u4e48\u4e0d\u5f97\u4e0d\u6539\u52a8ClassA<\/code>\u7684\u6784\u9020\u65b9\u6cd5\uff0c\u4e0d\u7b26\u5408\u5f00\u95ed\u539f\u5219<\/strong>\u3002<\/p>\n
\u56e0\u6b64\u6211\u4eec\u9700\u8981\u4e00\u79cd\u6ce8\u5165\u65b9\u5f0f\uff0c\u5c06\u4f9d\u8d56\u6ce8\u5165\u5230\u5bbf\u4e3b\u7c7b\uff08\u6216\u8005\u53eb\u76ee\u6807\u7c7b\uff09\u4e2d\uff0c\u4ece\u800c\u89e3\u51b3\u4e0a\u9762\u6240\u8ff0\u7684\u95ee\u9898\u3002\u4f9d\u8d56\u6ce8\u5165\u6709\u4ee5\u4e0b\u51e0\u79cd\u65b9\u5f0f\uff1a<\/p>\n
\u901a\u8fc7\u63a5\u53e3\u6ce8\u5165<\/p>\n
interface ClassBInterface {\n    void setB(ClassB b);\n}\n\npublic class ClassA implements ClassBInterface {\n    ClassB classB;\n\n    @override\n    void setB(ClassB b) {\n        classB = b;\n    }\n}<\/code><\/pre>\n
\u901a\u8fc7set\u65b9\u6cd5\u6ce8\u5165<\/p>\n
public class ClassA {\n    ClassB classB;\n\n    public void setClassB(ClassB b) {\n        classB = b;\n    }\n}<\/code><\/pre>\n
\u901a\u8fc7\u6784\u9020\u65b9\u6cd5\u6ce8\u5165<\/p>\n
public class ClassA {\n    ClassB classB;\n\n    public void ClassA(ClassB b) {\n        classB = b;\n    }\n}<\/code><\/pre>\n
\u901a\u8fc7Java\u6ce8\u89e3<\/p>\n
public class ClassA {\n    \/\/\u6b64\u65f6\u5e76\u4e0d\u4f1a\u5b8c\u6210\u6ce8\u5165\uff0c\u8fd8\u9700\u8981\u4f9d\u8d56\u6ce8\u5165\u6846\u67b6\u7684\u652f\u6301\uff0c\u5982RoboGuice, Dagger2\n    @inject ClassB classB;\n\n    ...\n    public ClassA() {}<\/code><\/pre>\n
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\"Dagger2\u4f9d\u8d56\u6ce8\u5165\"<\/p>\n
\u5f15\u5165Dagger2<\/h2>\n
api 'com.google.dagger:dagger:2.28.3'\nannotationProcessor 'com.google.dagger:dagger-compiler:2.28.3'<\/code><\/pre>\n
\u4f7f\u7528Dagger2<\/h2>\n
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public class MainActivity extends AppCompatActivity implements MainView {\n    private MainPresenter mainPresenter;\n    ...\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n        \/\/\u5b9e\u4f8b\u5316presenter \u5c06view\u4f20\u9012\u7ed9presenter\n        mainPresenter = new MainPresenter(this);\n        \/\/\u8c03\u7528Presenter\u65b9\u6cd5\u52a0\u8f7d\u6570\u636e\n        mainPresenter.loadData();\n\n        ...\n    }\n\n    @Override\n    public void updateUI() {\n        Toast.makeText(this, "Dagger2", Toast.LENGTH_SHORT).show();\n    }\n}\n\npublic class MainPresenter {\n    \/\/MainView\u662f\u4e2a\u63a5\u53e3\n    private MainView mView;\n\n    MainPresenter(MainView view) {\n        mView = view;\n    }\n\n    public void loadData() {\n        \/\/\u8c03\u7528model\u5c42\u65b9\u6cd5\uff0c\u52a0\u8f7d\u6570\u636e\n        ...\n        \/\/\u56de\u8c03\u65b9\u6cd5\u6210\u529f\u65f6\n        mView.updateUI();\n    }\n}<\/code><\/pre>\n
\u8fd9\u6837Activity<\/code>\u4e0ePresenter<\/code>\u7d27\u7d27\u8026\u5408\u5728\u4e86\u4e00\u8d77\uff0c\u5f53\u9700\u8981\u6539\u53d8Presenter<\/code>\u7684\u6784\u9020\u65b9\u5f0f\u65f6\uff0c\u9700\u8981\u4fee\u6539\u8fd9\u91cc\u7684\u4ee3\u7801\u3002\u5982\u679c\u7528\u4f9d\u8d56\u6ce8\u5165\u7684\u8bdd\uff0c\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
public class MainActivity extends AppCompatActivity implements MainView {\n    @Inject\n    MainPresenter mainPresenter;\n    ...\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n\n        DaggerMainComponent.builder()\n                .mainModule(new MainModule(this))\n                .build()\n                .inject(this);\n        \/\/\u8c03\u7528Presenter\u65b9\u6cd5\u52a0\u8f7d\u6570\u636e\n        mainPresenter.loadData();\n\n        ...\n    }\n\n    @Override\n    public void updateUI() {\n        Toast.makeText(this, "Dagger2", Toast.LENGTH_SHORT).show();\n    }\n}<\/code><\/pre>\n
public interface MainView {\n    void updateUI();\n}<\/code><\/pre>\n
public class MainPresenter {\n    \/\/MainView\u662f\u4e2a\u63a5\u53e3\n    private MainView mView;\n\n    @Inject\n    MainPresenter(MainView view) {\n        mView = view;\n    }\n\n    public void loadData() {\n        \/\/\u8c03\u7528model\u5c42\u65b9\u6cd5\uff0c\u52a0\u8f7d\u6570\u636e\n        ...\n        \/\/\u56de\u8c03\u65b9\u6cd5\u6210\u529f\u65f6\n        mView.updateUI();\n    }\n}<\/code><\/pre>\n
@Module\npublic class MainModule {\n    private final MainView mView;\n\n    public MainModule(MainView view) {\n        mView = view;\n    }\n\n    @Provides\n    MainView provideMainView() {\n        return mView;\n    }\n}<\/code><\/pre>\n
@Component(modules = MainModule.class)\npublic interface MainComponent {\n    void inject(MainActivity activity);\n}<\/code><\/pre>\n
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\u5148\u770bMainActivity<\/code>\u91cc\u7684\u4ee3\u7801\uff0c\u4e4b\u524d\u662f\u76f4\u63a5\u58f0\u660eMainPresenter<\/code>\uff0c\u73b0\u5728\u5728\u58f0\u660e\u7684\u57fa\u7840\u4e0a\u52a0\u4e86\u4e00\u4e2a\u6ce8\u89e3@Inject<\/code>\uff0c\u8868\u660eMainPresenter<\/code>\u662f\u9700\u8981\u6ce8\u5165\u5230MainActivity<\/code>\u4e2d\uff0c\u5373MainActivity<\/code>\u4f9d\u8d56\u4e8eMainPresenter<\/code>\uff0c\u8fd9\u91cc\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4f7f\u7528@Inject<\/code>\u65f6\uff0c\u4e0d\u80fd\u7528private<\/code>\u4fee\u9970\u7b26\u4fee\u9970\u7c7b\u7684\u6210\u5458\u5c5e\u6027<\/strong>\u3002<\/p>\n
\u7136\u540e\u6211\u4eec\u5728MainPresenter<\/code>\u7684\u6784\u9020\u51fd\u6570\u4e0a\u540c\u6837\u52a0\u4e86@Inject<\/code>\u6ce8\u89e3\u3002\u8fd9\u6837MainActivity<\/code>\u91cc\u7684mainPresenter<\/code>\u4e0e\u4ed6\u7684\u6784\u9020\u51fd\u6570\u5efa\u7acb\u4e86\u67d0\u79cd\u8054\u7cfb\u3002\u8fd9\u79cd\u8054\u7cfb\u53ef\u4ee5\u8fd9\u6837\u7406\u89e3\uff0c\u5f53\u770b\u5230\u67d0\u4e2a\u7c7b\u88ab@Inject<\/code>\u6807\u8bb0\u65f6\uff0c\u5c31\u4f1a\u5230\u5b83\u7684\u6784\u9020\u65b9\u6cd5\u4e2d\uff0c\u5982\u679c\u8fd9\u4e2a\u6784\u9020\u65b9\u6cd5\u4e5f\u88ab@Inject<\/code>\u6807\u8bb0\u7684\u8bdd\uff0c\u5c31\u4f1a\u81ea\u52a8\u521d\u59cb\u5316\u8fd9\u4e2a\u7c7b\uff0c\u4ece\u800c\u5b8c\u6210\u4f9d\u8d56\u6ce8\u5165\u3002<\/p>\n
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Component<\/code>\u662f\u4e00\u4e2a\u63a5\u53e3\u6216\u8005\u62bd\u8c61\u7c7b\uff0c\u7528@Component<\/code>\u6ce8\u89e3\u6807\u6ce8\uff08\u8fd9\u91cc\u5148\u4e0d\u7ba1\u62ec\u53f7\u91cc\u7684modules<\/code>\uff09\uff0c\u6211\u4eec\u5728\u8fd9\u4e2a\u63a5\u53e3\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2ainject()<\/code>\u65b9\u6cd5\uff0c\u53c2\u6570\u662fMainactivity<\/code>\u3002\u7136\u540erebuild<\/code>\u4e00\u4e0b\u9879\u76ee\uff0c\u4f1a\u751f\u6210\u4e00\u4e2a\u4ee5Dagger<\/code>\u4e3a\u524d\u7f00\u7684Component<\/code>\u7c7b\uff0c\u8fd9\u91cc\u662fDaggerMainComponent<\/code>\uff0c\u7136\u540e\u5728MainActivity<\/code>\u91cc\u5b8c\u6210\u6ce8\u518c\uff1a<\/p>\n
DaggerMainComponent.builder()\n        .mainModule(new MainModule(this))\n        .build()\n        .inject(this);<\/code><\/pre>\n
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\u5b8c\u6210Presenter<\/code>\u7684\u6ce8\u5165\u8fc7\u7a0b\uff0c\u53d1\u73b0\u8fd8\u6709\u4e00\u4e2aMainModule<\/code>\u7c7b\uff0cMainModlue<\/code>\u662f\u4e00\u4e2a\u6ce8\u89e3\u7c7b\uff0c\u7528@Module<\/code>\u6ce8\u89e3\u6807\u6ce8\uff0c\u4e3b\u8981\u7528\u6765\u63d0\u4f9b\u4f9d\u8d56\u3002\u521a\u624d\u901a\u8fc7@Inject<\/code>\u5c31\u53ef\u4ee5\u5b8c\u6210\u4f9d\u8d56\uff0c\u4e3a\u4ec0\u4e48\u8fd9\u91cc\u8fd8\u8981\u7528\u5230Module<\/code>\u7c7b\u6765\u63d0\u4f9b\u4f9d\u8d56\uff1f\u4e4b\u6240\u4ee5\u6709Module<\/code>\u7c7b\u4e3b\u8981\u662f\u4e3a\u4e86\u63d0\u4f9b\u90a3\u4e9b\u6ca1\u6709\u6784\u9020\u51fd\u6570\u7684\u7c7b\u7684\u4f9d\u8d56\uff0c\u8fd9\u4e9b\u7c7b\u65e0\u6cd5\u7528@Inject<\/code>\u6807\u6ce8\uff0c\u6bd4\u5982\u7b2c\u4e09\u65b9\u7c7b\u5e93\uff0c\u7cfb\u7edf\u7c7b\uff0c\u4ee5\u53ca\u4e0a\u9762\u793a\u4f8b\u7684View<\/code>\u63a5\u53e3\u3002<\/p>\n
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@Component(modules = MainModule.class)\npublic interface MainComponent {\n    void inject(MainActivity activity);\n}<\/code><\/pre>\n
\u6240\u4ee5Module<\/code>\u8981\u53d1\u6325\u4f5c\u7528\uff0c\u8fd8\u662f\u8981\u4f9d\u9760\u4e8eComponent<\/code>\u7c7b\uff0c\u4e00\u4e2aComponent<\/code>\u7c7b\u53ef\u4ee5\u5305\u542b\u591a\u4e2aModule\u7c7b\uff0c\u7528\u6765\u63d0\u4f9b\u4f9d\u8d56\u3002\u6211\u4eec\u63a5\u7740\u770b\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\uff1a<\/p>\n
DaggerMainComponent.builder()\n        .mainModule(new MainModule(this))\n        .homeModulw(new HomeModule(this))\n        .build()\n        .inject(this);<\/code><\/pre>\n
\u8fd9\u91cc\u901a\u8fc7new MainModule(this)<\/code>\u5c06view<\/code>\u4f20\u9012\u5230MainModule<\/code>\u91cc\uff0c\u7136\u540eMainModule<\/code>\u91cc\u7684provideMainView()<\/code>\u65b9\u6cd5\u8fd4\u56de\u8fd9\u4e2aView<\/code>\uff0c\u5f53\u53bb\u5b9e\u4f8b\u5316MainPresenter<\/code>\u65f6\uff0c\u53d1\u73b0\u6784\u9020\u51fd\u6570\u6709\u4e2a\u53c2\u6570\uff0c\u6b64\u65f6\u4f1a\u5728Module<\/code>\u91cc\u67e5\u627e\u63d0\u4f9b\u8fd9\u4e2a\u4f9d\u8d56\u7684\u65b9\u6cd5\uff0c\u5c06\u8be5View<\/code>\u4f20\u9012\u8fdb\u53bb\uff0c\u8fd9\u6837\u5c31\u5b8c\u6210\u4e86presenter<\/code>\u91ccView<\/code>\u7684\u6ce8\u5165\u3002<\/p>\n
Dagger2\u6ce8\u5165\u603b\u7ed3<\/h2>\n
\u6211\u4eec\u6765\u91cd\u65b0\u7406\u4e00\u904d\u4e0a\u9762\u7684\u6ce8\u5165\u8fc7\u7a0b\uff0c\u9996\u5148\u5f04\u6e05\u695a\u4ee5\u4e0b\u51e0\u4e2a\u6982\u5ff5\uff1a<\/p>\n
    \n
  • @Inject<\/code> \u5e26\u6709\u6b64\u6ce8\u89e3\u7684\u5c5e\u6027\u6216\u6784\u9020\u65b9\u6cd5\u5c06\u53c2\u4e0e\u5230\u4f9d\u8d56\u6ce8\u5165\u4e2d\uff0cDagger2<\/code>\u4f1a\u5b9e\u4f8b\u5316\u6709\u6b64\u6ce8\u89e3\u7684\u7c7b<\/li>\n
  • @Module<\/code> \u5e26\u6709\u6b64\u6ce8\u89e3\u7684\u7c7b\uff0c\u7528\u6765\u63d0\u4f9b\u4f9d\u8d56\uff0c\u91cc\u9762\u5b9a\u4e49\u4e00\u4e9b\u7528@Provides<\/code>\u6ce8\u89e3\u7684\u4ee5provide<\/code>\u5f00\u5934\u7684\u65b9\u6cd5\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u5c31\u662f\u63d0\u4f9b\u6240\u9700\u7684\u4f9d\u8d56\uff0cDagger2<\/code>\u4f1a\u5728\u8be5\u7c7b\u4e2d\u5bfb\u627e\u5b9e\u4f8b\u5316\u67d0\u4e2a\u7c7b\u6240\u9700\u8981\u7684\u4f9d\u8d56<\/li>\n
  • @Component<\/code> \u7528\u6765\u5c06@Inject<\/code>\u548c@Module<\/code>\u8054\u7cfb\u8d77\u6765\u7684\u6865\u6881\uff0c\u4ece@Module<\/code>\u4e2d\u83b7\u53d6\u4f9d\u8d56\u5e76\u5c06\u4f9d\u8d56\u6ce8\u5165\u7ed9@Inject<\/code><\/li>\n<\/ul>\n
    \u63a5\u7740\u6211\u4eec\u91cd\u65b0\u56de\u987e\u4e00\u4e0b\u4e0a\u9762\u7684\u6ce8\u5165\u8fc7\u7a0b\uff1a\u9996\u5148MainActivity<\/code>\u9700\u8981\u4f9d\u8d56MainPresenter<\/code>\uff0c\u56e0\u6b64\uff0c\u6211\u4eec\u5728MainActivity<\/code>\u4e2d\u7528@Inject<\/code>\u5bf9MainPresenter<\/code>\u8fdb\u884c\u6807\u6ce8\uff0c\u8868\u660e\u8fd9\u662f\u8981\u6ce8\u5165\u7684\u7c7b\u3002\u7136\u540e\uff0c\u6211\u4eec\u5bf9MainPresenter<\/code>\u7684\u6784\u9020\u51fd\u6570\u4e5f\u6dfb\u52a0\u6ce8\u89e3@Inject<\/code>\uff0c\u6b64\u65f6\u6784\u9020\u51fd\u6570\u91cc\u6709\u4e00\u4e2a\u53c2\u6570MainView<\/code>\uff0c\u56e0\u4e3aMainPresenter<\/code>\u9700\u8981\u4f9d\u8d56MainView<\/code>\uff0c\u6240\u4ee5\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7c7b\uff0c\u53eb\u505aMainModule<\/code>\uff0c\u63d0\u4f9b\u4e00\u4e2a\u65b9\u6cd5provideMainView<\/code>\uff0c\u7528\u6765\u63d0\u4f9b\u8fd9\u4e2a\u4f9d\u8d56\uff0c\u8fd9\u4e2aMainView<\/code>\u662f\u901a\u8fc7MainModule<\/code>\u7684\u6784\u9020\u51fd\u6570\u6ce8\u5165\u8fdb\u6765\u7684\uff0c\u63a5\u7740\u6211\u4eec\u9700\u8981\u5b9a\u4e49Component<\/code>\u63a5\u53e3\u7c7b\uff0c\u5e76\u5c06Module<\/code>\u5305\u542b\u8fdb\u6765\uff0c\u5373<\/p>\n
    @Component(modules = MainModule.class)\npublic interface MainComponent {\n    void inject(MainActivity activity);\n}<\/code><\/pre>\n
    Dagger2\u6ce8\u5165\u539f\u7406<\/h2>\n
    Dagger2<\/code>\u4e0e\u5176\u4ed6\u4f9d\u8d56\u6ce8\u5165\u6846\u67b6\u4e0d\u540c\uff0c\u5b83\u662f\u901a\u8fc7APT<\/code>\u5373\u6ce8\u89e3\u5904\u7406\u5668(Annotation Processing Tool)\u63d2\u4ef6\u5728\u7f16\u8bd1\u9636\u6bb5\u751f\u6210\u76f8\u5e94\u7684\u6ce8\u5165\u4ee3\u7801\uff0c\u6267\u884cBuild Project<\/code>\uff0cDagger2<\/code>\u4f1a\u5728app\/build\/generated\/ap_generated_sources\/debug\/out<\/code>\u76ee\u5f55\u4e0b\u751f\u6210\u5bf9\u5e94\u7684\u5de5\u5382\u7c7b\uff1a<\/p>\n
      \n
    • MainPresenter_Factory.java<\/code><\/li>\n
    • MainModule_ProvideMainViewFactory.java<\/code><\/li>\n
    • DaggerMainComponent.java<\/code><\/li>\n
    • MainActivity_MembersInjector.java<\/code><\/li>\n<\/ul>\n
      \u6784\u9020\u65b9\u6cd5 @Inject<\/h3>\n
      \u7c7bMainPresenter_Factory<\/code>\u662f\u7c7bMainPresenter<\/code>\u7684\u6784\u9020\u65b9\u6cd5\u4f7f\u7528@Inject<\/code>\u6807\u6ce8\u540e\u6784\u5efa\u751f\u6210\u7684\u5de5\u5382\u7c7b\uff1a<\/p>\n
      public class MainPresenter {\n    \/\/MainView\u662f\u4e2a\u63a5\u53e3\n    private MainView mView;\n\n    @Inject\n    MainPresenter(MainView view) {\n        mView = view;\n    }\n}<\/code><\/pre>\n
      public final class MainPresenter_Factory implements Factory<MainPresenter> {\n    private final Provider<MainView> viewProvider;\n\n    public MainPresenter_Factory(Provider<MainView> viewProvider) {\n        this.viewProvider = viewProvider;\n    }\n\n    @Override\n    public MainPresenter get() {\n        return newInstance(viewProvider.get());\n    }\n\n    public static MainPresenter_Factory create(Provider<MainView> viewProvider) {\n        return new MainPresenter_Factory(viewProvider);\n    }\n\n    public static MainPresenter newInstance(MainView view) {\n        return new MainPresenter(view);\n    }\n}<\/code><\/pre>\n
      @Provides<\/h3>\n
      \u7c7bMainModule_ProvideMainViewFactory<\/code>\u662f\u7c7bMainModule<\/code>\u7684provideMainView()<\/code>\u65b9\u6cd5\u4f7f\u7528@Provides<\/code>\u6807\u6ce8\u540e\u6784\u5efa\u751f\u6210\u7684\u5de5\u5382\u7c7b\uff1a<\/p>\n
      @Module\npublic class MainModule {\n    private final MainView mView;\n\n    public MainModule(MainView view) {\n        mView = view;\n    }\n\n    @Provides\n    MainView provideMainView() {\n        return mView;\n    }\n}<\/code><\/pre>\n
      public final class MainModule_ProvideMainViewFactory implements Factory<MainView> {\n    private final MainModule module;\n\n    public MainModule_ProvideMainViewFactory(MainModule module) {\n        this.module = module;\n    }\n\n    @Override\n    public MainView get() {\n        return provideMainView(module);\n    }\n\n    public static MainModule_ProvideMainViewFactory create(MainModule module) {\n        return new MainModule_ProvideMainViewFactory(module);\n    }\n\n    public static MainView provideMainView(MainModule instance) {\n        return Preconditions.checkNotNull(instance.provideMainView(), "Cannot return null from a non-@Nullable @Provides method");\n    }\n}<\/code><\/pre>\n
      \u8fd9\u91cc\u4e0d\u96be\u53d1\u73b0\u4e00\u79cd\u5bf9\u5e94\u5173\u7cfb\uff0c\u5728MainModule<\/code>\u4e2d\u5b9a\u4e49\u7684@Provides<\/code>\u4fee\u9970\u7684\u65b9\u6cd5\u90fd\u4f1a\u5bf9\u5e94\u7684\u751f\u6210\u4e00\u4e2a\u5bf9\u5e94\u5de5\u5382\u7c7b\uff0c\u8fd9\u91cc\u662fMainModule_ProvideMainViewFactory<\/code><\/p>\n
      @Component<\/h3>\n
      \u7c7bDaggerMainComponent<\/code>\u662f\u7c7bMainComponent<\/code>\u4f7f\u7528@Component<\/code>\u6807\u6ce8\u540e\u6784\u5efa\u751f\u6210\u7684\u8f85\u52a9\u7c7b\uff0c@Component<\/code>\u662f\u8fde\u63a5@Module<\/code>\u548c@Inject<\/code>\u7684\u6865\u6881\uff0c\u4e3b\u8981\u4f5c\u7528\u662f\u6267\u884cinject<\/code>\u65b9\u6cd5\uff0c\u4e3aMainPresenter<\/code>\u6784\u9020\u65b9\u6cd5\u8d4b\u503c\u53c2\u6570MainView<\/code><\/p>\n
      @Component(modules = MainModule.class)\npublic interface MainComponent {\n    void inject(MainActivity activity);\n}<\/code><\/pre>\n
      public final class DaggerMainComponent implements MainComponent {\n    private final MainModule mainModule;\n\n    private DaggerMainComponent(MainModule mainModuleParam) {\n        this.mainModule = mainModuleParam;\n    }\n\n    public static Builder builder() {\n        return new Builder();\n    }\n\n    private MainPresenter getMainPresenter() {\n        return new MainPresenter(MainModule_ProvideMainViewFactory.provideMainView(mainModule));\n    }\n\n    @Override\n    public void inject(MainActivity activity) {\n        injectMainActivity(activity);\n    }\n\n    private MainActivity injectMainActivity(MainActivity instance) {\n        MainActivity_MembersInjector.injectMainPresenter(instance, getMainPresenter());\n        return instance;\n    }\n\n    public static final class Builder {\n        private MainModule mainModule;\n\n        private Builder() {\n        }\n\n        public Builder mainModule(MainModule mainModule) {\n            this.mainModule = Preconditions.checkNotNull(mainModule);\n            return this;\n        }\n\n        public MainComponent build() {\n            Preconditions.checkBuilderRequirement(mainModule, MainModule.class);\n             return new DaggerMainComponent(mainModule);\n        }\n    }\n}<\/code><\/pre>\n
      \u5f15\u7528\u6ce8\u5165 @Inject<\/h3>\n
      \u7c7bMainActivity_MembersInjector<\/code>\u662f\u7c7bMainActivity<\/code>\u7684mainPresenter<\/code>\u6210\u5458\u53d8\u91cf\u4f7f\u7528@Inject<\/code>\u6807\u6ce8\u540e\u6784\u5efa\u751f\u6210\u7684\u8f85\u52a9\u7c7b\uff0c\u4e3b\u8981\u4f5c\u7528\u662f\u521d\u59cb\u5316mainPresenter<\/code><\/p>\n
      public class MainActivity extends AppCompatActivity implements MainView {\n\n    @Inject\n    MainPresenter mainPresenter;\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n\n        DaggerMainComponent.builder()\n                .mainModule(new MainModule(this))\n                .build()\n                .inject(this);\n        \/\/\u8c03\u7528Presenter\u65b9\u6cd5\u52a0\u8f7d\u6570\u636e\n        mainPresenter.loadData();\n    }\n\n    @Override\n    public void updateUI() {\n        Toast.makeText(this, "AppBlog.CN", Toast.LENGTH_SHORT).show();\n    }\n}<\/code><\/pre>\n
      public final class MainActivity_MembersInjector implements MembersInjector<MainActivity> {\n    private final Provider<MainPresenter> mainPresenterProvider;\n\n    public MainActivity_MembersInjector(Provider<MainPresenter> mainPresenterProvider) {\n        this.mainPresenterProvider = mainPresenterProvider;\n    }\n\n    public static MembersInjector<MainActivity> create(\n              Provider<MainPresenter> mainPresenterProvider) {\n        return new MainActivity_MembersInjector(mainPresenterProvider);\n    }\n\n    @Override\n    public void injectMembers(MainActivity instance) {\n        injectMainPresenter(instance, mainPresenterProvider.get());\n    }\n\n    @InjectedFieldSignature("me.yezhou.dagger2.MainActivity.mainPresenter")\n    public static void injectMainPresenter(MainActivity instance, MainPresenter mainPresenter) {\n        instance.mainPresenter = mainPresenter;\n    }\n}<\/code><\/pre>\n
      \u8c03\u7528\u6d41\u7a0b<\/h3>\n
      \uff081\uff09inject\u8c03\u7528<\/p>\n
      MainActivity<\/code><\/p>\n
      DaggerMainComponent.builder()\n        .mainModule(new MainModule(this))\n        .build()\n        .inject(this);<\/code><\/pre>\n
      DaggerMainComponent<\/code><\/p>\n
      @Override\npublic void inject(MainActivity activity) {\n    injectMainActivity(activity);\n}<\/code><\/pre>\n
      private MainActivity injectMainActivity(MainActivity instance) {\n    MainActivity_MembersInjector.injectMainPresenter(instance, getMainPresenter());\n    return instance;\n}<\/code><\/pre>\n
      \uff082\uff09\u6784\u5efaMainPresenter<\/code>\uff0c\u4f20\u5165MainView<\/code><\/p>\n
      DaggerMainComponent<\/code><\/p>\n
      private MainPresenter getMainPresenter() {\n    return new MainPresenter(MainModule_ProvideMainViewFactory.provideMainView(mainModule));\n}<\/code><\/pre>\n
      \uff083\uff09\u901a\u8fc7MainModule<\/code>\u6784\u5efaMainView<\/code><\/p>\n
      MainModule_ProvideMainViewFactory<\/code><\/p>\n
      public static MainView provideMainView(MainModule instance) {\n    return Preconditions.checkNotNull(instance.provideMainView(), "Cannot return null from a non-@Nullable @Provides method");\n}<\/code><\/pre>\n
      MainModule<\/code><\/p>\n
      @Provides\nMainView provideMainView() {\n    return mView;\n}<\/code><\/pre>\n
      \uff084\uff09\u521d\u59cb\u5316MainActivity<\/code>\u4e2d\u7684mainPresenter<\/code><\/p>\n
      MainActivity_MembersInjector<\/code><\/p>\n
      @InjectedFieldSignature("me.yezhou.dagger2.MainActivity.mainPresenter")\npublic static void injectMainPresenter(MainActivity instance, MainPresenter mainPresenter) {\n    instance.mainPresenter = mainPresenter;\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
      Dagger2\u7b80\u4ecb Dagger2\u662fDagger\u7684\u5347\u7ea7\u7248\uff0c\u662f\u4e00\u4e2a\u4f9d\u8d56\u6ce8\u5165\u6846\u67b6\uff0c\u73b0\u5728\u7531Google\u63a5\u624b\u7ef4\u62a4\u3002 G […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115],"tags":[478],"class_list":["post-1856","post","type-post","status-publish","format-standard","hentry","category-thirdpart-framework","tag-dagger"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1856","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1856"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/1856\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1856"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1856"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1856"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}