I want to do a core api service integration in my Android project.
My core service class is as follows:
public class TestApplication extends MultiDexApplication {
private static final String LOG_TAG_NETWORK = "GNetwork";
public static JacksonConverterFactory factory;
private static TestApplication instance;
private OkHttpClient.Builder okHttpBuilder;
private TestService testtService;
private Location lastKnownLocation;
public static TestApplication getInstance() {
return instance;
}
@Override
public void onCreate() {
super.onCreate();
instance = this;
Pref.init(this);
okHttpBuilder = new OkHttpClient.Builder();
okHttpBuilder.connectTimeout(UrlConstants.CONNECT_TIMEOUT_IN_SECONDS, TimeUnit.SECONDS)
.readTimeout(UrlConstants.READ_TIMEOUT_IN_SECONDS, TimeUnit.SECONDS)
.writeTimeout(UrlConstants.WRITE_TIMEOUT_IN_SECONDS, TimeUnit.SECONDS);
if (BuildConfig.LOG_ENABLED) {
HttpLoggingInterceptor httpLoggingInterceptor =
new HttpLoggingInterceptor(message -> Log.d(LOG_TAG_NETWORK, message));
httpLoggingInterceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
okHttpBuilder.addInterceptor(httpLoggingInterceptor);
}
factory = getJacksonConverterFactory();
}
@NonNull
private JacksonConverterFactory getJacksonConverterFactory() {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
return JacksonConverterFactory.create(objectMapper);
}
public void setupRetrofit() {
String BASE_URL = "http://xxxxx";
Retrofit retrofit = new Retrofit.Builder().baseUrl(BASE_URL).client(okHttpBuilder.build())
.addConverterFactory(factory).build();
testService = retrofit.create(TestService.class);
}
public TestService getTestService() {
return testService;
}
}
Then I create an instance from this core class. But here my constant getIntance value returns null.
TestApplication.getInstance().setupRetrofit();
I can’t understand that. GetInstance method always return null;
In my app build.gradle file is multiDexEnabled true.
How to solve this situation?
never use instance of application like this. for get application instance you need activity and in your activity you can use
static TestApplication getInstance(Activity activity) {
if (instance == null)
instance = ((TestApplication) activity.getApplication());
return instance;
}
this will solve your issues but the way you implement retrofit and using it is not best practices. You can find better way that doesn’t need activity.
3
change getInstance()
from this
public static TestApplication getInstance() {
return instance;
}
to this
public static TestApplication getInstance() {
instance=new TestApplication();
return instance;
}
and also remove this line from oncreate
instance = this;
After Enabling Multidex
Replace With:-
public class Application extends MultiDexApplication {
public static final String TAG = Application.class.getSimpleName();
@Override
public void onCreate() {
super.onCreate();
ApplicationHelper.initDatabaseHelper(this);
PostInteractor.getInstance(this).subscribeToNewPosts();
}
}