android获取context的方法,Android获取全局Context的方法

Android获取全局Context的方法

Android--应用全局获取Context - 超宇的博客 - CSDN博客

https://blog.csdn.net/chaoyu168/article/details/64444274

如何构建Android MVVM 应用框架 -

https://tech.meituan.com/android_mvvm.html

看这篇文章说的还是需要每个ViewModel需要持了一个Context的引用

但应该可以做个ViewModel内都可以使用的&＃xff0c;不用每个方法都传入那么麻烦

使用mvvm框架可以参考下面的实现方式&＃xff0c;得改几个地方比较繁琐

&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;

实例:

AppComponent增加 FavoritesDBManager FavoritesDBManager();

&＃64;Singleton

&＃64;Component(modules &＃61; AppModule.class)

public interface AppComponent {

SharedPreferences sharedPreferences();

Context context();

FavoritesDBManager FavoritesDBManager();

}

---------------------

CoinListComponent增加注解&＃xff1a;dependencies &＃61; AppComponent.class

&＃64;FragmentScope

&＃64;Component(modules &＃61; CoinListModule.class, dependencies &＃61; AppComponent.class)

public interface CoinListComponent {

----------------

全局AppModule增加provideFavoritesDBManager

&＃64;Module

public class AppModule {

private Context context;

public AppModule(Context context) {

this.context &＃61; context;

}

&＃64;Provides

&＃64;Singleton

FavoritesDBManager provideFavoritesDBManager() {

return new FavoritesDBManager(context);

}

----------------

CoinListViewModel 增加&＃64;Inject FavoritesDBManager mFavoritesDBManager;

用到的的地方直接调用

public class CoinListViewModel extends BaseViewModel implements CoinlistItemClickLisnter {

&＃64;Inject

FavoritesDBManager mFavoritesDBManager;

if(status &＃61;&＃61; 0) {

ListlistData &＃61; mFavoritesDBManager.getFavoritesListData();

}

&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;

java.lang.IllegalStateException: com.aax.exchange.inject.AppComponent must be set

at com.aax.exchange.inject.component.DaggerCoinListComponent$Builder.build(DaggerCoinListComponent.java:75)

at com.aax.exchange.fragment.CoinListFragment.inject(CoinListFragment.java:56)

at com.aax.exchange.base.BaseMvvmFragment.onCreateView(BaseMvvmFragment.java:54)

---------------------

用到的地方CoinSearchActivity&＃xff0c;CoinListFragment都要加上.appComponent(ComponentHolder.getComponent())

--------------

&＃64;Override

protected void inject() {

CoinSearchComponent component &＃61; DaggerCoinSearchComponent.builder()

.coinSearchModule(new CoinSearchModule(this)).appComponent(ComponentHolder.getComponent())

.build();

&＃64;Override

protected void inject() {

CoinListComponent component &＃61; DaggerCoinListComponent.

builder().coinListModule(new CoinListModule(this)).appComponent(ComponentHolder.getComponent())

.build();

------------------

public class ComponentHolder {

private static AppComponent mComponent;

public static AppComponent getComponent() {

return mComponent;

}

public static void setComponent(AppComponent component) {

mComponent &＃61; component;

}

}

&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;&＃61;

subscribe(fragment.mAct,Api.getApiService().getFavorites(new ObserverResponseListener() {

&＃64;Override

public void onNext(Object o) {

ToastUtil.showLongToast("get favorites ");

String tradingPair &＃61; data.getQuote() &＃43; data.getBase();

Favorites fav &＃61; new Favorites();

fav.setTradingPair(tradingPair);

mFavoritesDBManager.addFavoritesData(fav);

}

&＃64;Override

public void onError(Throwable e) {

ToastUtil.showLongToast("get favorites error");

}

}, fragment.bindToLifecycle(),false,false);