Java 插入匕首返回空值
这方面已经被封锁了好几天了 出于某种原因,AndroidModule.java中的“应用程序”成员字段在注入后为空 AndroidModule.javaJava 插入匕首返回空值,java,android,dagger,Java,Android,Dagger,这方面已经被封锁了好几天了 出于某种原因,AndroidModule.java中的“应用程序”成员字段在注入后为空 AndroidModule.java @Module( library = true ) public class AndroidModule { @Inject MittoApplication application; @Provides @Singleton SharedPreferences provideSharedPrefer
@Module(
library = true
)
public class AndroidModule {
@Inject MittoApplication application;
@Provides @Singleton
SharedPreferences provideSharedPreferences() {
return PreferenceManager.getDefaultSharedPreferences( application );
}
}
@Module(
includes = { ApiModule.class, AndroidModule.class },
library = true
)
public class ApplicationModule {
private Application application;
public ApplicationModule( Application application ) {
this.application = application;
}
@Provides @Singleton
Application providesApplication() {
return application;
}
}
ApplicationModule.java
@Module(
library = true
)
public class AndroidModule {
@Inject MittoApplication application;
@Provides @Singleton
SharedPreferences provideSharedPreferences() {
return PreferenceManager.getDefaultSharedPreferences( application );
}
}
@Module(
includes = { ApiModule.class, AndroidModule.class },
library = true
)
public class ApplicationModule {
private Application application;
public ApplicationModule( Application application ) {
this.application = application;
}
@Provides @Singleton
Application providesApplication() {
return application;
}
}
BaseActivity.java
public class BaseActivity extends AppCompatActivity {
private ObjectGraph objectGraph;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
objectGraph = MittoApplication.getApplication(this).buildScopedObjectGraph(getModules());
objectGraph.inject(this);
}
@Override
protected void onDestroy() {
objectGraph = null;
super.onDestroy();
}
protected List<Object> getModules( ) {
return Arrays.<Object>asList(
);
}
}
公共类BaseActivity扩展了AppCompativity{
私有对象图对象图;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
objectGraph=MittoApplication.getApplication(this.buildScopedObjectGraph(getModules());
objectGraph.inject(this);
}
@凌驾
受保护的空onDestroy(){
objectGraph=null;
super.ondestory();
}
受保护的列表getModules(){
返回数组.asList(
);
}
}
MittoApplication.java
public class MittoApplication extends Application {
private static Context context;
private ObjectGraph objectGraph;
public void onCreate() {
super.onCreate();
MittoApplication.context = getApplicationContext();
initializeObjectGraph();
}
public static MittoApplication getApplication( Context context ) {
MittoApplication mittoApplication = (MittoApplication) context.getApplicationContext();
return mittoApplication;
}
public ObjectGraph getObjectGraph() {
return this.objectGraph;
}
public ObjectGraph buildObjectGraph( List<Object> modules ) {
return ObjectGraph.create(modules.toArray() );
}
public ObjectGraph buildScopedObjectGraph( List<Object> modules ) {
return objectGraph.plus(modules.toArray() );
}
private ObjectGraph buildInitialObjectGraph( List<Object> modules ) {
return ObjectGraph.create( modules.toArray() );
}
private void initializeObjectGraph() {
objectGraph = buildInitialObjectGraph( Arrays.<Object>asList( new ApplicationModule(this) ));
}
public static Context getContext() {
return MittoApplication.context;
}
}
公共类MittoApplication扩展应用程序{
私有静态语境;
私有对象图对象图;
public void onCreate(){
super.onCreate();
MittoApplication.context=getApplicationContext();
初始化对象图();
}
公共静态MittoApplication getApplication(上下文){
MittoApplication MittoApplication=(MittoApplication)上下文。getApplicationContext();
返回应用程序;
}
公共对象图getObjectGraph(){
返回此.objectGraph;
}
公共对象图buildObjectGraph(列出模块){
返回ObjectGraph.create(modules.toArray());
}
公共对象图buildScopedObjectGraph(列出模块){
返回objectGraph.plus(modules.toArray());
}
私有ObjectGraph buildInitialObjectGraph(列出模块){
返回ObjectGraph.create(modules.toArray());
}
私有void initializeObjectGraph(){
objectGraph=buildInitialObjectGraph(Arrays.asList(新的应用程序模块(this)));
}
公共静态上下文getContext(){
返回MittoApplication.context;
}
}
我花了很多时间思考这个问题,我看过无数的例子和博客网站。我希望有比我更聪明的人来帮忙
感谢阅读。字段注入仅在直接调用对象图时有效。要获取提供者方法的
应用程序
实例,需要将其作为提供者方法的参数引用
//@Inject MittoApplication application; //this won't work
@Provides @Singleton
SharedPreferences provideSharedPreferences(Application application) { //this will
return PreferenceManager.getDefaultSharedPreferences( application );
}
另外,您实际上从未提供过MittoApplication
,只提供了应用程序
值得注意的是,您正在使用Dagger1,因此我相信您需要将AndroidModule
更改为complete=false
:
@Module(
library = true,
complete = false
)
public class AndroidModule {