這個匕首簡單的例子有什麼問題？

1 - 範圍：這個匕首簡單的例子有什麼問題？

@Scope 
@Retention(RetentionPolicy.CLASS) 
public @interface PerInstance {}

2 - AppContextModule：

@Module 
public class AppContextModule { 

Application application; 

public AppContextModule(Application application){ 
    this.application = application; 
} 

@Provides 
public Application application(){ 
    return this.application; 
} 

@Provides 
public Context context(){ 
    return this.application; 
} 

@Provides 
public LocationManager locationManager(Context context){ 
    return (LocationManager)  context.getSystemService(context.LOCATION_SERVICE); 
} 

}

3 - MeuPrimeiroModule：

@Module 
public class MeuPrimeiroModule { 

@Provides 
@PerInstance 
public String nome() { 
    return new String("Gorick"); 
} 

}

4 - MeuSegundoModule：

@Module(includes = MeuPrimeiroModule.class) 
public class MeuSegundoModule { 

@Provides 
@Singleton 
public String nomeCompleto(MeuPrimeiroModule meuPrimeiroModule) { 
    return new String(meuPrimeiroModule + " Silva"); 
} 

}

5 - MeuPrimeiroComponent：

@PerInstance 
@Component(modules={MeuPrimeiroModule.class}) 
public interface MeuPrimeiroComponent { 
void inject(MainActivity mainActivity); 
}

6 - MeuSegundoComponent：

@Singleton 
@Component(modules={MeuSegundoComponent.class}) 
public interface MeuSegundoComponent extends MeuPrimeiroComponent { 

void inject(MainActivity mainActivity); 
}

7 - AppContextComponent：

public interface AppContextComponent { 

Application app(); //provision method 
Context applicationContext(); //provision method 
LocationManager locationManager(); //provision method 
}

8 - ApplicationComponent：

@Singleton 
@Component(modules={AppContextModule.class}) 
public interface ApplicationComponent extends AppContextComponent { 
void inject(MainActivity mainActivity); 
}

9 - MainActivity：

public class MainActivity extends AppCompatActivity { 

@Inject 
MeuPrimeiroComponent meuPrimeiroComponent; 

@Inject 
MeuSegundoComponent meuSegundoComponent; 

TextView nome, nomeCompleto; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    nome = (TextView) findViewById(R.id.nome); 
    nomeCompleto = (TextView) findViewById(R.id.nomeCompleto); 

    setNome(nome, nomeCompleto); 
} 

public void setNome(TextView nome, TextView nomeCompleto){ 
    nome.setText(meuPrimeiroComponent.toString()); 
    nomeCompleto.setText(meuSegundoComponent.toString()); 
} 

}

體形：

Error:(16, 10) error: gorick.dagger2.Dagger2.Component.MeuPrimeiroComponent cannot be provided without an @Provides- or @Produces-annotated method. 
gorick.dagger2.Dagger2.Component.MeuPrimeiroComponent is injected at 
gorick.dagger2.MainActivity.meuPrimeiroComponent 
gorick.dagger2.MainActivity is injected at 
gorick.dagger2.Dagger2.Component.ApplicationComponent.inject(mainActivity)

PS：如果我使用meuPrimeiroComponent.nome（），android studio找不到nome（）方法。

來源

2017-03-02 Danilo Silva

從哪裏注入'MainActivity'？ –

來自MeuPrimeiroComponent。 –

，而不是你需要的對象，其構造函數中包含的值是由供應商

欲瞭解更多信息參考收益注入不能注入元件值這個Example

你需要建立在onCreate()這樣的組件：

DaggerMeuPrimeiroComponent.builder() 
       // list of modules that are part of this component need to be created here too 
       .appContextModule(new AppContextModule(getApplicationContext())) // This also corresponds to the name of your module: %component_name%Module 
       .build().inject(this);

來源

2017-03-02 12:23:01

我不明白你的答案。 –

我編輯了我的答案併爲您提供了示例 –

這個匕首簡單的例子有什麼問題？

回答

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