《Android进阶之光》--Dagger2

No1：

Project的build.gradle文件添加

buildscript{dependencies{...classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'}
}

Module:app的build.gradle添加

apply plugin: 'com.neenbedankt.android-apt'
...
dependencies{...apt 'com.google.dagger:dagger-compiler:2.7'compile 'com.google.dagger:dagger:2.7'
}

No2：

@Inject、@Component

public class Watch{@Injectpublic Watch(){}public void work(){}
}

@Component
public interface MainActivityComponent{void inject(MainActivity activity);
}

调用

public class MainActivity extends AppCompatActivity{super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);DaggerMainActivityComponent.create().inject(this);//2
    watch.work();
}

No3：

@Module、@Provides

@Inject
Gson gson;

@Module
public class GsonModule{@Providespublic Gson provideGson(){return new Gson();}
}

@Component(modules = GsonModule.class)
public interface MainActivityComponent{void inject(MainActivity activity);
}

调用

public class MainActivity extends AppCompatActivity{@InjectGson gson;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);DaggerMainActivityComponent.create().inject(this);String jsonData = "{'name':'zhangwuji','age':20}";Man man = gson.fromJson(jsonData,Man.class);}
}

No4：

@Named、@Qualifier

@Module
public class EngineModule{@Provides@Named("Gasoline")public Engine provideGasoline(){return new GasolineEngine();}@Provides@Named("Diesel")public Engine provideDiesel(){return new DieselEngine();}
}

调用

public class Car{private Engine engine;@Injectpublic Car(@Named("Diesel") Engine engine){this.engine = engine;}public String run(){return engine.work();}
}

-------------------------------------

@Qualifier
@Retention(RUNTIME)
public @interface GasoLine{
}@Qualifier
@Retention(RUNTIME)
public @interface Diesel{
}

@Module
public class EngineModule{@Provides@Gasonlinepublic Engine provideGasoline(){return new GasolineEngine();}@Provides@Dieselpublic Engine provideDiesel(){return new DieselEngine();}
}

public class Car{private Engine engine;@Injectpublic Car(@Gasoline Engine engine){this.engine = engine;}public String run(){return engine.work();}
}

No5：

@Singleton、@Scope

@Inject
Gson gson;
@Inject
Gson gson1;

@Module
public class GsonModule{@Singleton@Providespublic Gson provideGson(){return new Gson();}
}

@Singleton
@Component(modules = GsonModule.class)
public interface MainActivityComponent{void inject(MainActiviy activity);
}

调用

public class MainActivity extends AppCompatActivity{private static final String TAG="Dagger2";@InjectGson gson;@InjectGson gson1;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);DaggerMainActivityComponent.create().inject(this);}
}

-----------------------------

@Scope
@Documented
@Retention(RUNTIME)
public @interface Singleton{}

@Scope
@Rentention(RUNTIME)
public @interface ApplicationScope{}

@Module
public class GsonModule{@ApplicationScope@Providespublic Gson provideGson(){return new Gson();}
}

@ApplicationScope
@Component(modules=GsonModule.class)
public interface ActivityComponent{void inject(MainActivity activity);void inject(SecondActivity activity);
}

public class App extends Application{ActivityComponent activityComponent;@Overridepublic void onCreate(){super.onCreate();activityComponent = DaggerActivityComponent.builder().build();}public static App get(Context context){return (App)context.getApplicationContext();}ActivityComponent getActivityComponent(){return activityComponent;}
}

调用

public class MainActivity extends AppCompatActivity{private static final String TAG="Dagger2";private Button bt_jump;@InjectGson gson;@InjectGson gson1;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);App.get(MainActivity.this).getActivityComponent().inject(this);onClick();}private void onClick(){bt_jump = (Button)findViewById(R.id.bt_jump);bt_jump.setOnClickListener(new View.OnClickListener(){@Overridepublic void onClick(View view){Intent intent = new Intent(MainActivity.this,SecondActivity.class);startActivity(intent);}});}
}

No6：

@Component

public class Swordsman{@Injectpublic Swordsman{}public String fighting(){return "欲为大树，莫与草争";}
}

@Module
public class SwordsmanModule{@Providespublic Swordsman provideSwordsman(){return new Swordsman();}
}@Component(modules = SwordsmanModule.class)
public interface SwordsmanComponent{Swordsman getSwordsman();
}

@ApplicationScope
@Component(modules = GsonModule.class,dependencies = SwordsmanComponent.class)
public interface ActivityComponent{void inject(MainActivity activity);void inject(SecondActivity activity);
}

public class App extends Application{ActivityComponent activityComponent;@Overridepublic void onCreate(){super.onCreate();activityComponent = DaggerActivityComponent.builder();swordsmanComponent(DaggerSwordsmanComponent.builder().build()).build();}public static App get(Context context){return (App)context.getApplicationContext();}ActivityComponent getActivityComponent(){return activityComponent;}
}

调用

public class SecondActivity extends AppCompatActivity{@InjectSwordsman swordsman;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);App.get(SecondActivity.this).getActivityComponent().inject(this);String sd = swordsman.fighting(;}
}

No7：

懒加载：在@Inject的时候不初始化，而是使用的时候，调用get方法来获取实例

public class SecondActivity extends AppCompatActivity{private static final String TAG="Dagger2";@InjectLazy<Swordsman> swordsmanLazy;@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_second);App.get(SecondActivity.this).getActivityComponent().inject(this);Swordsman swordsman = swordsmanLazy.get();swordsman.fighting();String sd1 = swordsman.fighting();}
}

转载于:https://www.cnblogs.com/anni-qianqian/p/8559761.html

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