如何在Intent服务中获取Context

Question

这是场景:我有一个WakefulBroadcastReceiver,它可以备份到网络计算机或云端.当我知道平板电脑可以访问局域网时,它将在半夜开始运行.备份将使用存储访问框架将数据存储到由实例化WakefulBroadcastReceiver的片段"拾取"的位置和文件.所以我需要能够访问ContentResolver,为此我需要上下文.

从我对文档的所有阅读中,这就是BroadcastReceiver的用途 - 一个潜在的长期运行任务,应该在后台完成,而不会发生太多其他事情. - 像备份一样.我还没有看到任何将所有内容放在一起的例子.

如何在IntentService中获取上下文？这是接收器和调度服务的片段.

  public class BackupAlarmReceiver extends WakefulBroadcastReceiver {

    @Override
        public void onReceive(Context context, Intent intent) {

            Intent service = new Intent(context, BackupSchedulingService.class);

        startWakefulService(context, service);

        }
}

public class BackupSchedulingService extends IntentService {
    public BackupSchedulingService() {
        super("BackupSchedulingService");
    }

 @Override
    protected void onHandleIntent(Intent intent) {

        Bundle extras = intent.getExtras(); 
        // How to get the context - it was a parameter when
        // creating the new IntentService class above? 
         }
}

示例代码几乎完全遵循Android参考手册代码:

https://developer.android.com/reference/android/support/v4/content/WakefulBroadcastReceiver.html

Answer 1

所以我的问题是如何在IntentService中获取上下文？

该IntentService 是的Context,因为IntentService从继承Context.

Answer 2

打电话吧 getApplicationContext()

Answer 3

您可以在onStartCommand()函数中获取上下文.

    public class ExampleService extends IntentService {
    private Context mContext;

    public ExampleService(String name) {
    super(name);
    }

    @Override
    protected void onHandleIntent(Intent intent) {

    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
    mContext = getApplicationContext();
    return super.onStartCommand(intent, flags, startId);
    }
    }