[英]Android Dagger 2 cannot resolve symbol builder()
我在Android Studio中使用Dagger 2,但是當嘗試通過DaggerMyComponent.builder()。myModule(new MyModule())。build()創建Component時,我總是看到紅色的“ builder() ”這個詞,它說“無法解析符號構建器”。
我必須說我已經多次清理和構建了項目,甚至評論了組件實例並在重建后對其進行了解除。 我還必須說我可以檢查DaggerMyComponent.class,一切似乎都沒問題,事實上,我可以毫無問題地導入該類。
該示例在GithHub上共享,鏈接如下:
https://github.com/alessandroargentieri/LetsDagger2Together
我有兩個類:BClass和AClass,它取決於第一個。 我有ABModule.class,它是工廠方法,ABComponent是組件接口。 DaggerABComponent創建到WholeApplication.class中,擴展了Application。
package mawashi.alex.letsdagger2together.Application;
import android.app.Application;
import mawashi.alex.letsdagger2together.DaggerClasses.ABComponent;
import mawashi.alex.letsdagger2together.DaggerClasses.ABModule;
import mawashi.alex.letsdagger2together.DaggerClasses.DaggerABComponent;
public class WholeApplication extends Application {
static ABComponent component;
@Override
public void onCreate() {
super.onCreate();
//here is where builder() is not recognized
component = new DaggerABComponent.builder().aBModule(new ABModule()).build();
}
public static ABComponent getComponent(){
return component;
}
}
模塊:
package mawashi.alex.letsdagger2together.DaggerClasses;
import dagger.Module;
import dagger.Provides;
import mawashi.alex.letsdagger2together.Model.AClass;
import mawashi.alex.letsdagger2together.Model.BClass;
@Module
public class ABModule {
@Provides
public BClass provideBClass(){
return new BClass("xxx");
}
@Provides
public AClass provideAClass(BClass bClass){
return new AClass(bClass);
}
}
零件:
package mawashi.alex.letsdagger2together.DaggerClasses;
import dagger.Component;
import mawashi.alex.letsdagger2together.MainActivity;
@Component (modules = {ABModule.class})
public interface ABComponent {
public void inject(MainActivity mainActivity);
}
要注入的類:
package mawashi.alex.letsdagger2together.Model;
public class BClass {
private String xfactor;
public BClass(String xfactor){
this.xfactor = xfactor;
}
public String getXfactor(){
return xfactor;
}
}
package mawashi.alex.letsdagger2together.Model;
public class AClass {
private BClass b;
public AClass(BClass b){
this.b = b;
}
public String getYfactor(){
return "Y-" + b.getXfactor() + "-Y";
}
}
注入AClass和BClass的位置:
package mawashi.alex.letsdagger2together;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
import javax.inject.Inject;
import mawashi.alex.letsdagger2together.Application.WholeApplication;
import mawashi.alex.letsdagger2together.DaggerClasses.ABModule;
import mawashi.alex.letsdagger2together.DaggerClasses.DaggerABComponent;
import mawashi.alex.letsdagger2together.Model.AClass;
public class MainActivity extends AppCompatActivity {
@Inject AClass a;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WholeApplication.getComponent().inject(this);
Toast.makeText(this, a.getYfactor(),Toast.LENGTH_LONG).show();
}
}
如果有人知道我錯了什么,那對我來說會很好。 感謝大家。
哦,我已經弄清楚了。
你添加了這一行:
component = new DaggerABComponent.builder().aBModule(new ABModule()).build();
它應該是這一行:
component = DaggerABComponent.builder().aBModule(new ABModule()).build();
所以只需刪除new
然后就可以了。
@Inject注釋的所有字段都必須是公共的: @Inject public AClass a;
在你的活動中
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