网上搜了用安卓的原生写法，react-native通过navtiveModules的方式来获取，但是那个方法报long的错误，好像不对，用不了
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;
import com.facebook.react.bridge.Promise;

public class CacheManagerModule extends ReactContextBaseJavaModule {

CacheManagerModule(ReactApplicationContext context) {
    super(context);
}

@Override
public String getName() {
    return "CacheManager";
}

@ReactMethod
public void getAppCacheSize(Promise promise) {
    long size = getFolderSize(context.getCacheDir());
    promise.resolve(size);
}

private long getFolderSize(File file) {
    long size = 0;
    try {
        File[] fileList = file.listFiles();
        for (File aFileList : fileList) {
            if (aFileList.isDirectory()) {
                size = size + getFolderSize(aFileList);
            } else {
                size = size + aFileList.length();
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
    return size;
}

}

能给个安卓和IOS 获取缓存和清除缓存的正确写法么

或者说 APP的缓存，就是Storage那些么？