dagger2错误“没有@Inject构造函数或@Provides注释方法无法提供android.app.Application”

我正在尝试在项目中实现dagger2，但遇到错误“ android.app.Application必须在没有@Inject构造函数或@Provides注释方法的情况下才能提供 ”。

这是我的代码：

App.java

package com.poppmedia.wallpaperautomaton;

import android.app.Application;

import com.poppmedia.wallpaperautomaton.di.DaggerAppComponent;

import dagger.android.AndroidInjector;
import dagger.android.DaggerApplication;

/**
 * The Android {@link Application}.
 */
public class App extends DaggerApplication {
    @Override
    protected AndroidInjector applicationInjector() {
        return DaggerAppComponent.builder().create(this);
    }
}

di / AppModule.java

package com.poppmedia.wallpaperautomaton.di;

import android.app.Application;
import android.content.Context;

import javax.inject.Singleton;

import dagger.Binds;
import dagger.Module;

/**
 * Provider application-wide dependencies.
 */
@Module
public interface AppModule {
    @Binds
    @Singleton
    Context bindContext(Application application);
}

di / AppComponent.java

package com.poppmedia.wallpaperautomaton.di;

import com.poppmedia.wallpaperautomaton.App;

import javax.inject.Singleton;

import dagger.Component;
import dagger.android.AndroidInjector;
import dagger.android.support.AndroidSupportInjectionModule;

/**
 * Injects application dependencies.
 */
@Singleton
@Component(modules = {
        AndroidSupportInjectionModule.class,
        AppModule.class,
})
public interface AppComponent extends AndroidInjector {
    @Component.Builder
    abstract class Builder extends AndroidInjector.Builder {}
}

di / TestClassModule.java

package com.poppmedia.wallpaperautomaton.di;

import android.content.Context;

import com.poppmedia.wallpaperautomaton.TestClass;

import javax.inject.Singleton;

import dagger.Module;
import dagger.Provides;

@Module
public class TestClassModule {
    @Provides
    @Singleton
    TestClass provideTestClass(Context context) {
        return new TestClass(context);
    }
}

di / TestClassComponent.java

package com.poppmedia.wallpaperautomaton.di;

import com.poppmedia.wallpaperautomaton.TestClass;

import javax.inject.Singleton;

import dagger.Component;

@Singleton
@Component(modules = { AppModule.class, TestClassModule.class })
public interface TestClassComponent {
    TestClass getTestClass();
}

TestClass.java

package com.poppmedia.wallpaperautomaton;

import android.content.Context;

import javax.inject.Inject;
import javax.inject.Singleton;

@Singleton
public class TestClass {
    private Context mContext;

    @Inject
    public TestClass(Context context) {
        mCOntext= context;
    }
}

谢谢。