如何在服务中获取资产？

Question

我无法找到如何public bool SaveDataCapDetails(List<TDataCapDetails> lstDataCapDetails) { bool IsSuccess = false; using (var dbContextTransaction = _objContext.Database.BeginTransaction()) { try { int? id = _objContext.TDataCapDetails.Max(x => (int?)x.Id); id = id == null ? 0 : id; // entities with Id == 0 --> new entities // you may need to check if Id == null as well (depends on your data model) var entitiesToAdd = lstDataCapDetails.Where(x => x.Id == 0); foreach(var entity in entitiesToAdd) { entity.Id = id++; // new entities is not tracked, its state can be changed to Added _objContext.Entry(entity).State = EntityState.Added; } // entities with Id > 0 is already exists in db and needs to be updated var entitiesToUpdate = lstDataCapDetails.Where(x => x.Id > 0); foreach (var entity in entitiesToUpdate) { // check if entity is being tracked var local = _objContext.Set<TDataCapDetails>().Local.FirstOrDefault(x => x.Id.Equals(entity.Id)); // if entity is tracked detach it from context if (local != null) _objContext.Entry<TDataCapDetails>(local).State = EntityState.Detached; // attach modified entity and change its state to modified _objContext.Attach(entity).State = EntityState.Modified; } // optional: assign value for IsSuccess IsSuccess = _objContext.SaveChanges() > 0; dbContextTransaction.Commit(); } catch (Exception ex) { dbContextTransaction.Rollback(); throw ex; } } return IsSuccess; } 在服务中。

例如接收者：

public class BroadcastReceiverOnBootComplete extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equalsIgnoreCase(Intent.ACTION_BOOT_COMPLETED)) {
            Intent serviceIntent = new Intent(context, AndroidServiceStartOnBoot.class);
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                context.startForegroundService(serviceIntent);
            } else {
                context.startService(serviceIntent);
            }
        }
    }
}

在getAssets类中，如何获取AndroidServiceStartOnBoot？

非常感谢。

已编辑：

问题不是如何在getContext().getAssets().open("server.crt");类中调用getAssets，而是问题是如何在服务BroadcastReceiverOnBootComplete类中getAssets。

我发布AndroidServiceStartOnBoot类的原因是因为这就是我所说的BroadcastReceiverOnBootComplete类。抱歉，这有点误导。谢谢。

Answer 1

onReceive为您提供广播接收器类中的上下文

public abstract void onReceive (Context context, Intent intent)

从那里开始，您可以直接使用它或将其分配给您的类级变量，也可以在其他方法中使用它

Context myContext = null;

@Override
public void onReceive(Context context, Intent intent) {
    //here you can access to context directly
    context.getAssets().open("MY_FILE");
    //or you can save it in your class level variable
    myContext = context;
    // now you can use this myContext to other methods of this class
}

  

修改

Service是Context

的固有内容

因此在服务中，您可以直接这样做...

Context context = this;

Answer 2

您已经有context
你尝试过吗？
context.getAssets().open("FILE_NAME");
对我有用