android - 设备关闭时的 IntentService onHandleIntent 行为

Question

设备关闭时 onHandleIntent 的行为是什么？

我知道在 IntentService 上，只要 onHandleIntent 没有完成它的工作，服务就会一直运行。

所以考虑一下这是一个关于设备关闭时服务行为的普遍问题，一旦我们再次启动设备，它们会“唤醒”吗？

如果不行，有办法吗？我希望我的 intentservice 继续运行直到 onHandleIntent 完成，无论发生什么。

编辑: 我将添加我的代码以便更好地理解。 我试图在 SQLite 上保存请求并继续运行直到该表为空，然后服务将关闭。 所以万一设备关机，我仍然会从关机前的同一个地方继续。 P.S - 我尝试使用 executor 以获得更好的性能(这是一个测试，尚未证明) 如果有人有更好的建议，我很乐意听取他们的意见，因为我是这个主题的新手

onHandleIntent

@Override
protected void onHandleIntent(Intent intent) {
    helper = new DBHelper(getApplicationContext());
    executor = Executors.newFixedThreadPool(5);
    File file;
    Log.e("requestsExists",helper.requestsExists()+"");
    while (helper.requestsExists()) {
        ArrayList<String> requestArr = helper.getRequestsToExcute(5);
        //checks if the DB requests exists
        if (!requestArr.isEmpty()) {
            //execute them and delete the DB entry
            for(int i = 0; i < requestArr.size(); i++) {
                file = new File(requestArr.get(i));

                Log.e("file",file.toString());
                Future<String> future = executor.submit(new MyThread(file,getApplicationContext()));

                Log.e("future object", future.toString());
                try {
                    long idToDelete = Long.parseLong(future.get());
                    Log.e("THREAD ANSWER", future.get() + "");
                    helper.deleteRequest(idToDelete);
                } catch (InterruptedException e) {
                    Log.e("future try", "");
                } catch (ExecutionException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    executor.shutdown();
}

我的线程

public class MyThread implements Callable {

    private File _file;
    private Context context;
    private DBHelper helper;

    public MyThread(File file, Context context) {
        this._file = file;
        this.context = context;
    }

    @Override
    public String call() throws Exception {
        HttpClient client = Utility.getNewHttpClient();
        HttpContext localContext = new BasicHttpContext();
        HttpPost post = new HttpPost("http://192.168.9.62/mobile_api/timeline/moment/upload");
        try {
            MultipartEntityBuilder builder = MultipartEntityBuilder.create();
            builder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE);

            FileBody fileBody = new FileBody(_file);
            builder.addPart("content", fileBody);
            builder.addPart("type", new StringBody("file", ContentType.TEXT_PLAIN));
            builder.addPart("title", new StringBody("service test", ContentType.TEXT_PLAIN));
            builder.addPart("userType", new StringBody("user", ContentType.TEXT_PLAIN));
            builder.addPart("uid", new StringBody(MyInfiActivity.friends_uid, ContentType.TEXT_PLAIN));
            builder.addPart("momentId", new StringBody("1", ContentType.TEXT_PLAIN));
            builder.addPart("storyId", new StringBody("8", ContentType.TEXT_PLAIN));
            Utility.addCookiesToPost(post);

            post.setEntity(builder.build());
            client.execute(post, localContext);
        } catch (IOException e) {
            Log.e("Callable try", post.toString());
        }
        return "1";
    }
}

Answer 1

我会尽量逐点回答你的问题

onHandleIntent 在设备关闭时的行为是什么？

由于设备将完全关闭，所有服务都将被强制停止，包括您的 IntentService。
您可以订阅ACTION_SHUTDOWN知道设备何时关闭并在它真正关闭之前做一些事情。

public class ShutdownHandlerReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //Handle here, but don't make actions that takes too long
    }    
}

此外，您还必须将其添加到 list 中

<receiver android:name=".ShutdownHandlerReceiver">
  <intent-filter>
    <action android:name="android.intent.action.ACTION_SHUTDOWN" />
  </intent-filter>
</receiver>

一旦我们再次启动设备，它们会“醒来”吗？

不，他们不会，因为他们已经处理过类似的东西，但你可以订阅 ACTION_BOOT_COMPLETED了解设备何时准备就绪。来自文档:

Broadcast Action: This is broadcast once, after the system has finished booting. It can be used to perform application-specific initialization, such as installing alarms. You must hold the RECEIVE_BOOT_COMPLETED permission in order to receive this broadcast.

   public class BootedReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        //Handle here, you can start again your stopped intentservices
    }    
}

在 list 中:

<receiver android:name=".BootedReceiver">
  <intent-filter>
    <action android:name="android.intent.action.BOOT_COMPLETED" />
  </intent-filter>
</receiver>

然后您可以重新启动意向服务队列，我想这是最好的方法。